Author: "Hugh S Markus" / Topic: 030104 developmental biology - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Hugh S Markus"' showing total 55 results

Start Over Author "Hugh S Markus" Topic 030104 developmental biology

55 results on '"Hugh S Markus"'

1. Microglial activation and blood–brain barrier permeability in cerebral small vessel disease

Author: John T. O'Brien, Gary A. Rosenberg, Jessica C. Walsh, Guy B. Williams, Hugh S. Markus, D Tozer, N. Jon Shah, Tim D. Fryer, Franklin I. Aigbirhio, Hasan Sari, Young T. Hong, and Anna M. Drazyk
Subjects: 0301 basic medicine, Pathology, medicine.medical_specialty, business.industry, medicine.disease, Blood–brain barrier, Endothelial activation, White matter, Leukoencephalopathy, Pathogenesis, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, medicine.anatomical_structure, Permeability (electromagnetism), medicine, ddc:610, Neurology (clinical), CADASIL, business, 030217 neurology & neurosurgery, Neuroinflammation
Abstract: Cerebral small vessel disease (SVD) is a major cause of stroke and dementia. The underlying pathogenesis is poorly understood, but both neuroinflammation and increased blood–brain barrier permeability have been hypothesized to play a role, and preclinical studies suggest the two processes may be linked. We used PET magnetic resonance to simultaneously measure microglial activation using the translocator protein radioligand 11C-PK11195, and blood–brain barrier permeability using dynamic contrast enhanced MRI. A case control design was used with two disease groups with sporadic SVD (n = 20), monogenic SVD (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy, CADASIL), and normal controls (n = 20) were studied. Hotspots of increased glial activation and blood–brain barrier permeability were identified as values greater than the 95th percentile of the distribution in controls. In sporadic SVD there was an increase in the volume of hotspots of both 11C-PK11195 binding (P = 0.003) and blood–brain barrier permeability (P = 0.007) in the normal appearing white matter, in addition to increased mean blood–brain barrier permeability (P
Published: 2021
Full Text: View/download PDF

2. Is periodontitis a risk factor for ischaemic stroke, coronary artery disease and subclinical atherosclerosis? A Mendelian randomization study

Author: Joel T. Gibson, Hugh S. Markus, Eric L. Harshfield, Steven Bell, Bell, Steven [0000-0001-6774-3149], Harshfield, Eric [0000-0001-8767-0928], Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, medicine.medical_specialty, Coronary Artery Disease, 030204 cardiovascular system & hematology, Carotid Intima-Media Thickness, Polymorphism, Single Nucleotide, Article, Brain Ischemia, Coronary artery disease, 03 medical and health sciences, 0302 clinical medicine, Risk Factors, Internal medicine, Mendelian randomization, medicine, Humans, Risk factor, Periodontitis, Stroke, Ischemic Stroke, Inflammation, business.industry, Confounding, Mendelian Randomization Analysis, Odds ratio, medicine.disease, Atherosclerosis, 030104 developmental biology, Cardiology and Cardiovascular Medicine, business, Genome-Wide Association Study
Abstract: Background and aims Observational studies have reported an association between periodontitis and cardiovascular disease but whether this association is causal is uncertain. We therefore used Mendelian randomization to test whether periodontitis is causally associated with stroke, coronary artery disease, or subclinical atherosclerosis. Methods A two-sample Mendelian randomization analysis was carried out using five single nucleotide polymorphisms previously associated with periodontitis in genome-wide association studies. Summary data were drawn from MEGASTROKE and combined with de novo analyses of UK Biobank for stroke and its major subtypes (up to 44,221 cases, 739,957 controls) and CARDIoGRAMplusC4D and UK Biobank for coronary artery disease (122,733 cases, 424,528 controls). We used existing data on carotid intima-media thickness in UK Biobank as a marker of subclinical atherosclerosis (N = 22,179). Causal estimates were obtained using inverse-variance weighted Mendelian randomization. Sensitivity analyses were performed using weighted median and MR-Egger approaches. Results No association was found between periodontitis and any stroke (odds ratio [OR] per doubling in the odds of periodontitis 0.99, 95% confidence interval [CI] 0.97 to 1.02), ischaemic stroke (OR 1.00, 95% CI 0.97 to 1.03) or its major subtypes (p > 0.4), or coronary artery disease (OR 1.01, 95% CI 0.99 to 1.03). Similarly, we found no association for periodontitis and subclinical atherosclerosis (β −0.002, 95% CI -0.004 to 0.001). These results were consistent across a series of sensitivity analyses. Conclusions These findings provide no robust evidence for a causal relationship between periodontitis and stroke or coronary artery disease. This suggests that associations reported in observational studies may represent confounding., Graphical abstract Image 1, Highlights • Periodontitis and cardiovascular disease correlate in observational studies. • Mendelian randomization does not support a causal association. • Results do not support treatment of periodontitis to reduce atherosclerotic disease.
Published: 2020

3. Sex-Dependent Shared and Nonshared Genetic Architecture Across Mood and Psychotic Disorders

Author: Gabriëlla A.M. Blokland, Jakob Grove, Chia-Yen Chen, Chris Cotsapas, Stuart Tobet, Robert Handa, David St Clair, Todd Lencz, Bryan J. Mowry, Sathish Periyasamy, Murray J. Cairns, Paul A. Tooney, Jing Qin Wu, Brian Kelly, George Kirov, Patrick F. Sullivan, Aiden Corvin, Brien P. Riley, Tõnu Esko, Lili Milani, Erik G. Jönsson, Aarno Palotie, Hannelore Ehrenreich, Martin Begemann, Agnes Steixner-Kumar, Pak C. Sham, Nakao Iwata, Daniel R. Weinberger, Pablo V. Gejman, Alan R. Sanders, Joseph D. Buxbaum, Dan Rujescu, Ina Giegling, Bettina Konte, Annette M. Hartmann, Elvira Bramon, Robin M. Murray, Michele T. Pato, Jimmy Lee, Ingrid Melle, Espen Molden, Roel A. Ophoff, Andrew McQuillin, Nicholas J. Bass, Rolf Adolfsson, Anil K. Malhotra, Nicholas G. Martin, Janice M. Fullerton, Philip B. Mitchell, Peter R. Schofield, Andreas J. Forstner, Franziska Degenhardt, Sabrina Schaupp, Ashley L. Comes, Manolis Kogevinas, José Guzman-Parra, Andreas Reif, Fabian Streit, Lea Sirignano, Sven Cichon, Maria Grigoroiu-Serbanescu, Joanna Hauser, Jolanta Lissowska, Fermin Mayoral, Bertram Müller-Myhsok, Beata Świątkowska, Thomas G. Schulze, Markus M. Nöthen, Marcella Rietschel, John Kelsoe, Marion Leboyer, Stéphane Jamain, Bruno Etain, Frank Bellivier, John B. Vincent, Martin Alda, Claire O’Donovan, Pablo Cervantes, Joanna M. Biernacka, Mark Frye, Susan L. McElroy, Laura J. Scott, Eli A. Stahl, Mikael Landén, Marian L. Hamshere, Olav B. Smeland, Srdjan Djurovic, Arne E. Vaaler, Ole A. Andreassen, Bernhard T. Baune, Tracy Air, Martin Preisig, Rudolf Uher, Douglas F. Levinson, Myrna M. Weissman, James B. Potash, Jianxin Shi, James A. Knowles, Roy H. Perlis, Susanne Lucae, Dorret I. Boomsma, Brenda W.J.H. Penninx, Jouke-Jan Hottenga, Eco J.C. de Geus, Gonneke Willemsen, Yuri Milaneschi, Henning Tiemeier, Hans J. Grabe, Alexander Teumer, Sandra Van der Auwera, Uwe Völker, Steven P. Hamilton, Patrik K.E. Magnusson, Alexander Viktorin, Divya Mehta, Niamh Mullins, Mark J. Adams, Gerome Breen, Andrew M. McIntosh, Cathryn M. Lewis, David M. Hougaard, Merete Nordentoft, Ole Mors, Preben B. Mortensen, Thomas Werge, Thomas D. Als, Anders D. Børglum, Tracey L. Petryshen, Jordan W. Smoller, Jill M. Goldstein, Stephan Ripke, Benjamin M. Neale, James T.R. Walters, Kai-How Farh, Peter A. Holmans, Phil Lee, Brendan Bulik-Sullivan, David A. Collier, Hailiang Huang, Tune H. Pers, Ingrid Agartz, Esben Agerbo, Margot Albus, Madeline Alexander, Farooq Amin, Silviu A. Bacanu, Richard A. Belliveau, Judit Bene, Sarah E. Bergen, Elizabeth Bevilacqua, Tim B. Bigdeli, Donald W. Black, Richard Bruggeman, Nancy G. Buccola, Randy L. Buckner, William Byerley, Wiepke Cahn, Guiqing Cai, Dominique Campion, Rita M. Cantor, Vaughan J. Carr, Noa Carrera, Stanley V. Catts, Kimberly D. Chambert, Raymond C.K. Chan, Ronald Y.L. Chen, Eric Y.H. Chen, Wei Cheng, Eric F.C. Cheung, Siow Ann Chong, C. Robert Cloninger, David Cohen, Nadine Cohen, Paul Cormican, Nick Craddock, James J. Crowley, David Curtis, Michael Davidson, Kenneth L. Davis, Jurgen Del Favero, Ditte Demontis, Dimitris Dikeos, Timothy Dinan, Gary Donohoe, Elodie Drapeau, Jubao Duan, Frank Dudbridge, Naser Durmishi, Peter Eichhammer, Johan Eriksson, Valentina Escott-Price, Laurent Essioux, Ayman H. Fanous, Martilias S. Farrell, Josef Frank, Lude Franke, Robert Freedman, Nelson B. Freimer, Marion Friedl, Joseph I. Friedman, Menachem Fromer, Giulio Genovese, Lyudmila Georgieva, Paola Giusti-Rodríguez, Stephanie Godard, Jacqueline I. Goldstein, Vera Golimbet, Srihari Gopal, Jacob Gratten, Lieuwe de Haan, Christian Hammer, Mark Hansen, Thomas Hansen, Vahram Haroutunian, Frans A. Henskens, Stefan Herms, Joel N. Hirschhorn, Per Hoffmann, Andrea Hofman, Mads V. Hollegaard, Masashi Ikeda, Inge Joa, Antonio Julià, René S. Kahn, Luba Kalaydjieva, Sena Karachanak-Yankova, Juha Karjalainen, David Kavanagh, Matthew C. Keller, James L. Kennedy, Andrey Khrunin, Yunjung Kim, Janis Klovins, Vaidutis Kucinskas, Zita Ausrele Kucinskiene, Hana Kuzelova-Ptackova, Anna K. Kähler, Claudine Laurent, Jimmy Lee Chee Keong, S. Hong Lee, Sophie E. Legge, Bernard Lerer, Miaoxin Li, Tao Li, Kung-Yee Liang, Jeffrey Lieberman, Svetlana Limborska, Carmel M. Loughland, Jan Lubinski, Jouko Lönnqvist, Milan Macek, Brion S. Maher, Wolfgang Maier, Jacques Mallet, Sara Marsal, Manuel Mattheisen, Morten Mattingsdal, Robert W. McCarley, Colm McDonald, Sandra Meier, Carin J. Meijer, Bela Melegh, Raquelle I. Mesholam-Gately, Andres Metspalu, Patricia T. Michie, Vihra Milanova, Younes Mokrab, Derek W. Morris, Kieran C. Murphy, Inez Myin-Germeys, Mari Nelis, Igor Nenadic, Deborah A. Nertney, Gerald Nestadt, Kristin K. Nicodemus, Liene Nikitina-Zake, Laura Nisenbaum, Annelie Nordin, Eadbhard O’Callaghan, Colm O’Dushlaine, F. Anthony O’Neill, Sang-Yun Oh, Ann Olincy, Line Olsen, Jim Van Os, Christos Pantelis, George N. Papadimitriou, Sergi Papiol, Elena Parkhomenko, Tiina Paunio, Milica Pejovic-Milovancevic, Diana O. Perkins, Olli Pietiläinen, Jonathan Pimm, Andrew J. Pocklington, John Powell, Alkes Price, Ann E. Pulver, Shaun M. Purcell, Digby Quested, Henrik B. Rasmussen, Abraham Reichenberg, Mark A. Reimers, Alexander L. Richards, Joshua L. Roffman, Panos Roussos, Douglas M. Ruderfer, Veikko Salomaa, Ulrich Schall, Christian R. Schubert, Sibylle G. Schwab, Edward M. Scolnick, Rodney J. Scott, Larry J. Seidman, Engilbert Sigurdsson, Teimuraz Silagadze, Jeremy M. Silverman, Kang Sim, Petr Slominsky, Hon-Cheong So, Chris C.A. Spencer, Hreinn Stefansson, Stacy Steinberg, Elisabeth Stogmann, Richard E. Straub, Eric Strengman, Jana Strohmaier, T. Scott Stroup, Mythily Subramaniam, Jaana Suvisaari, Dragan M. Svrakic, Jin P. Szatkiewicz, Erik Söderman, Srinivas Thirumalai, Draga Toncheva, Sarah Tosato, Juha Veijola, John Waddington, Dermot Walsh, Dai Wang, Qiang Wang, Bradley T. Webb, Mark Weiser, Dieter B. Wildenauer, Nigel M. Williams, Stephanie Williams, Stephanie H. Witt, Aaron R. Wolen, Emily H.M. Wong, Brandon K. Wormley, Hualin Simon Xi, Clement C. Zai, Xuebin Zheng, Fritz Zimprich, Naomi R. Wray, Kari Stefansson, Peter M. Visscher, Douglas H.R. Blackwood, Ariel Darvasi, Enrico Domenici, Michael Gill, Hugh Gurling, Christina M. Hultman, Assen V. Jablensky, Kenneth S. Kendler, Jo Knight, Qingqin S. Li, Jianjun Liu, Steven A. McCarroll, Jennifer L. Moran, Michael J. Owen, Carlos N. Pato, Danielle Posthuma, Pamela Sklar, Jens R. Wendland, Mark J. Daly, Michael C. O’Donovan, Peter Donnelly, Ines Barroso, Jenefer M. Blackwell, Matthew A. Brown, Juan P. Casas, Panos Deloukas, Audrey Duncanson, Janusz Jankowski, Hugh S. Markus, Christopher G. Mathew, Colin N.A. Palmer, Robert Plomin, Anna Rautanen, Stephen J. Sawcer, Richard C. Trembath, Ananth C. Viswanathan, Nicholas W. Wood, Gavin Band, Céline Bellenguez, Colin Freeman, Eleni Giannoulatou, Garrett Hellenthal, Richard Pearson, Matti Pirinen, Amy Strange, Zhan Su, Damjan Vukcevic, Cordelia Langford, Hannah Blackburn, Suzannah J. Bumpstead, Serge Dronov, Sarah Edkins, Matthew Gillman, Emma Gray, Rhian Gwilliam, Naomi Hammond, Sarah E. Hunt, Alagurevathi Jayakumar, Jennifer Liddle, Owen T. McCann, Simon C. Potter, Radhi Ravindrarajah, Michelle Ricketts, Avazeh Tashakkori-Ghanbaria, Matthew Waller, Paul Weston, Pamela Whittaker, Sara Widaa, Mark I. McCarthy, Maria J. Arranz, Steven Bakker, Stephan Bender, Benedicto Crespo-Facorro, Jeremy Hall, Conrad Iyegbe, Stephen Lawrie, Kuang Lin, Don H. Linszen, Ignacio Mata, Muriel Walshe, Matthias Weisbrod, Durk Wiersma, Vassily Trubetskoy, Yunpeng Wang, Jonathan R.I. Coleman, Héléna A. Gaspar, Christiaan A. de Leeuw, Jennifer M. Whitehead Pavlides, Maciej Trzaskowski, Enda M. Byrne, Liam Abbott, Huda Akil, Diego Albani, Ney Alliey-Rodriguez, Adebayo Anjorin, Verneri Antilla, Swapnil Awasthi, Judith A. Badner, Marie Bækvad-Hansen, Jack D. Barchas, Nicholas Bass, Michael Bauer, Richard Belliveau, Carsten Bøcker Pedersen, Erlend Bøen, Marco P. Boks, James Boocock, Monika Budde, William Bunney, Margit Burmeister, Jonas Bybjerg-Grauholm, Miquel Casas, Felecia Cerrato, Kimberly Chambert, Alexander W. Charney, Danfeng Chen, Claire Churchhouse, Toni-Kim Clarke, William Coryell, David W. Craig, Cristiana Cruceanu, Piotr M. Czerski, Anders M. Dale, Simone de Jong, Jurgen Del-Favero, J. Raymond DePaulo, Amanda L. Dobbyn, Ashley Dumont, Torbjørn Elvsåshagen, Chun Chieh Fan, Sascha B. Fischer, Matthew Flickinger, Tatiana M. Foroud, Liz Forty, Christine Fraser, Katrin Gade, Diane Gage, Julie Garnham, Claudia Giambartolomei, Marianne Giørtz Pedersen, Jaqueline Goldstein, Scott D. Gordon, Katherine Gordon-Smith, Elaine K. Green, Melissa J. Green, Tiffany A. Greenwood, Weihua Guan, Martin Hautzinger, Urs Heilbronner, Maria Hipolito, Dominic Holland, Laura Huckins, Jessica S. Johnson, Radhika Kandaswamy, Robert Karlsson, Sarah Kittel-Schneider, Anna C. Koller, Ralph Kupka, Catharina Lavebratt, Jacob Lawrence, William B. Lawson, Markus Leber, Phil H. Lee, Shawn E. Levy, Jun Z. Li, Chunyu Liu, Anna Maaser, Donald J. MacIntyre, Pamela B. Mahon, Lina Martinsson, Steve McCarroll, Peter McGuffin, Melvin G. McInnis, James D. McKay, Helena Medeiros, Sarah E. Medland, Fan Meng, Grant W. Montgomery, Thomas W. Mühleisen, Hoang Nguyen, Caroline M. Nievergelt, Annelie Nordin Adolfsson, Evaristus A. Nwulia, Claire O'Donovan, Loes M. Olde Loohuis, Anil P.S. Ori, Lilijana Oruc, Urban Ösby, Amy Perry, Andrea Pfennig, Eline J. Regeer, Céline S. Reinbold, John P. Rice, Fabio Rivas, Margarita Rivera, Euijung Ryu, Cristina Sánchez-Mora, Alan F. Schatzberg, William A. Scheftner, Nicholas J. Schork, Cynthia Shannon Weickert, Tatyana Shehktman, Paul D. Shilling, Claire Slaney, Janet L. Sobell, Christine Søholm Hansen, Anne T. Spijker, Michael Steffens, John S. Strauss, Szabolcs Szelinger, Robert C. Thompson, Thorgeir E. Thorgeirsson, Jens Treutlein, Helmut Vedder, Weiqing Wang, Stanley J. Watson, Thomas W. Weickert, Simon Xi, Wei Xu, Allan H. Young, Peter Zandi, Peng Zhang, Sebastian Zöllner, Abdel Abdellaoui, Tracy M. Air, Till F.M. Andlauer, Silviu-Alin Bacanu, Aartjan T.F. Beekman, Elisabeth B. Binder, Julien Bryois, Henriette N. Buttenschøn, Na Cai, Enrique Castelao, Jane Hvarregaard Christensen, Lucía Colodro-Conde, Baptiste Couvy-Duchesne, Gregory E. Crawford, Gail Davies, Ian J. Deary, Eske M. Derks, Nese Direk, Conor V. Dolan, Erin C. Dunn, Thalia C. Eley, Farnush Farhadi Hassan Kiadeh, Hilary K. Finucane, Jerome C. Foo, Fernando S. Goes, Lynsey S. Hall, Thomas F. Hansen, Ian B. Hickie, Georg Homuth, Carsten Horn, David M. Howard, Marcus Ising, Rick Jansen, Ian Jones, Lisa A. Jones, Eric Jorgenson, Isaac S. Kohane, Julia Kraft, Warren W. Kretzschmar, Zoltán Kutalik, Yihan Li, Penelope A. Lind, Dean F. MacKinnon, Robert M. Maier, Jonathan Marchini, Hamdi Mbarek, Patrick McGrath, Christel M. Middeldorp, Evelin Mihailov, Francis M. Mondimore, Sara Mostafavi, Matthias Nauck, Bernard Ng, Michel G. Nivard, Dale R. Nyholt, Paul F. O'Reilly, Hogni Oskarsson, Jodie N. Painter, Roseann E. Peterson, Wouter J. Peyrot, Giorgio Pistis, Jorge A. Quiroz, Per Qvist, Saira Saeed Mirza, Robert Schoevers, Eva C. Schulte, Ling Shen, Stanley I. Shyn, Grant C.B. Sinnamon, Johannes H. Smit, Daniel J. Smith, Katherine E. Tansey, Henning Teismann, Wesley Thompson, Pippa A. Thomson, Matthew Traylor, André G. Uitterlinden, Daniel Umbricht, Albert M. van Hemert, Shantel Marie Weinsheimer, Jürgen Wellmann, Yang Wu, Hualin S. Xi, Jian Yang, Futao Zhang, Volker Arolt, Klaus Berger, Udo Dannlowski, Katharina Domschke, Caroline Hayward, Andrew C. Heath, Stefan Kloiber, Glyn Lewis, Pamela AF. Madden, Patrik K. Magnusson, Preben Bo Mortensen, Michael C. O'Donovan, Sara A. Paciga, Nancy L. Pedersen, David J. Porteous, Catherine Schaefer, Henry Völzke, Marco Bortolato, Janita Bralten, Cynthia M. Bulik, Christie L. Burton, Caitlin E. Carey, Lea K. Davis, Laramie E. Duncan, Howard J. Edenberg, Lauren Erdman, Stephen V. Faraone, Slavina B. Goleva, Wei Guo, Christopher Hübel, Laura M. Huckins, Ekaterina A. Khramtsova, Joanna Martin, Carol A. Mathews, Elise Robinson, Eli Stahl, Barbara E. Stranger, Michela Traglia, Raymond K. Walters, Lauren A. Weiss, Stacey J. Winham, Yin Yao, Kristjar Skajaa, Markus Nöthen, Michael Owen, Robert H. Yolken, Niels Plath, Jonathan Mill, Daniel Geschwind, Psychiatry 1, RS: MHeNs - R2 - Mental Health, Psychiatrie & Neuropsychologie, Centre of Excellence in Complex Disease Genetics, Research Programme of Molecular Medicine, Research Programs Unit, Aarno Palotie / Principal Investigator, Institute for Molecular Medicine Finland, Genomics of Neurological and Neuropsychiatric Disorders, Functional Genomics, Biological Psychology, APH - Mental Health, APH - Methodology, Sociology and Social Gerontology, APH - Personalized Medicine, APH - Health Behaviors & Chronic Diseases, Blokland, Gabriella AM, Grove, Jakob, Chen, Chia Yen, Cotsapas, Chris, Tobet, Stuart, Handa, Robert, Lee, Sang Hong, Schizophrenia Working Group of the Psychiatric Genomics Consortium, Bipolar Disorder Working Group of the Psychiatric Genomics Consortium, Major Depressive Disorder Working Group of the Psychiatric Genomics Consortium, Sex Differences Cross-Disorder Analysis Group of the Psychiatric Genomics Consortium, iPSYCH, Psychiatry, Amsterdam Neuroscience - Complex Trait Genetics, Amsterdam Neuroscience - Mood, Anxiety, Psychosis, Stress & Sleep, Human genetics, Amsterdam Neuroscience - Compulsivity, Impulsivity & Attention, Amsterdam Reproduction & Development (AR&D), Child and Adolescent Psychiatry / Psychology, Adult Psychiatry, ANS - Complex Trait Genetics, and ANS - Mood, Anxiety, Psychosis, Stress & Sleep
Subjects: 0301 basic medicine, Male, Bipolar Disorder, Schizophrenia/genetics, LD SCORE REGRESSION, Genome-wide association study, 0302 clinical medicine, Receptors, SCHIZOPHRENIA, Psychotic Disorders/genetics, KYNURENINE PATHWAY METABOLISM, Genetics, RISK, Sex Characteristics, Vascular Endothelial Growth Factor, Bipolar Disorder/genetics, Major/genetics, Single Nucleotide, AFFECTIVE STIMULI IMPACT, Schizophrenia, Sulfurtransferases, Major depressive disorder, Female, Depressive Disorder, Major/genetics, Bipolar disorder, Locus (genetics), Genomics, Biology, Polymorphism, Single Nucleotide, Article, DYSPHORIC MOOD, 03 medical and health sciences, Sex differences, medicine, Humans, Genetic Predisposition to Disease, ddc:610, Polymorphism, GENOME-WIDE ASSOCIATION, Genotype-by-sex interaction, Biological Psychiatry, Depressive Disorder, Major, Depressive Disorder, GENDER-DIFFERENCES, Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7], PARAVENTRICULAR NUCLEUS, 3112 Neurosciences, Endothelial Cells, MAJOR DEPRESSION, medicine.disease, Genetic architecture, 030104 developmental biology, Mood, Receptors, Vascular Endothelial Growth Factor, Psychotic Disorders, 3111 Biomedicine, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: Contains fulltext : 248656.pdf (Publisher’s version ) (Closed access) BACKGROUND: Sex differences in incidence and/or presentation of schizophrenia (SCZ), major depressive disorder (MDD), and bipolar disorder (BIP) are pervasive. Previous evidence for shared genetic risk and sex differences in brain abnormalities across disorders suggest possible shared sex-dependent genetic risk. METHODS: We conducted the largest to date genome-wide genotype-by-sex (G×S) interaction of risk for these disorders using 85,735 cases (33,403 SCZ, 19,924 BIP, and 32,408 MDD) and 109,946 controls from the PGC (Psychiatric Genomics Consortium) and iPSYCH. RESULTS: Across disorders, genome-wide significant single nucleotide polymorphism-by-sex interaction was detected for a locus encompassing NKAIN2 (rs117780815, p = 3.2 × 10(-8)), which interacts with sodium/potassium-transporting ATPase (adenosine triphosphatase) enzymes, implicating neuronal excitability. Three additional loci showed evidence (p < 1 × 10(-6)) for cross-disorder G×S interaction (rs7302529, p = 1.6 × 10(-7); rs73033497, p = 8.8 × 10(-7); rs7914279, p = 6.4 × 10(-7)), implicating various functions. Gene-based analyses identified G×S interaction across disorders (p = 8.97 × 10(-7)) with transcriptional inhibitor SLTM. Most significant in SCZ was a MOCOS gene locus (rs11665282, p = 1.5 × 10(-7)), implicating vascular endothelial cells. Secondary analysis of the PGC-SCZ dataset detected an interaction (rs13265509, p = 1.1 × 10(-7)) in a locus containing IDO2, a kynurenine pathway enzyme with immunoregulatory functions implicated in SCZ, BIP, and MDD. Pathway enrichment analysis detected significant G×S interaction of genes regulating vascular endothelial growth factor receptor signaling in MDD (false discovery rate-corrected p < .05). CONCLUSIONS: In the largest genome-wide G×S analysis of mood and psychotic disorders to date, there was substantial genetic overlap between the sexes. However, significant sex-dependent effects were enriched for genes related to neuronal development and immune and vascular functions across and within SCZ, BIP, and MDD at the variant, gene, and pathway levels.
Published: 2022
Full Text: View/download PDF

4. The effect of NOTCH3 pathogenic variant position on CADASIL disease severity: NOTCH3 EGFr 1–6 pathogenic variant are associated with a more severe phenotype and lower survival compared with EGFr 7–34 pathogenic variant

Author: Julie W. Rutten, Bastian J. Van Eijsden, Marco Duering, Eric Jouvent, Christian Opherk, Leonardo Pantoni, Antonio Federico, Martin Dichgans, Hugh S. Markus, Hugues Chabriat, Saskia A.J. Lesnik Oberstein, Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: Adult, Male, 0301 basic medicine, Genotype-phenotype correlation, Genotype–phenotype correlation, Brain, CADASIL, Middle Aged, 030105 genetics & heredity, Article, Stroke, 03 medical and health sciences, Phenotype, 030104 developmental biology, Protein Domains, NOTCH3, Disease Progression, Humans, Female, Receptor, Notch3, Small-vessel disease, Genetics (clinical), Aged, Netherlands
Abstract: PURPOSE: CADASIL is a small-vessel disease caused by a cysteine-altering pathogenic variant in one of the 34 epidermal growth factor-like repeat (EGFr) domains of the NOTCH3 protein. We recently found that pathogenic variant in EGFr domains 7-34 have an unexpectedly high frequency in the general population (1:300). We hypothesized that EGFr 7-34 pathogenic variant more frequently cause a much milder phenotype, thereby explaining an important part of CADASIL disease variability. METHODS: Age at first stroke, survival and white matter hyperintensity volume were compared between 664 CADASIL patients with either a NOTCH3 EGFr 1-6 pathogenic variant or an EGFr 7-34 pathogenic variant. The frequencies of NOTCH3 EGFr 1-6 and EGFr 7-34 pathogenic variant were compared between individuals in the genome Aggregation Database and CADASIL patients. RESULTS: CADASIL patients with an EGFr 1-6 pathogenic variant have a 12-year earlier onset of stroke than those with an EGFr 7-34 pathogenic variant, lower survival, and higher white matter hyperintensity volumes. Among diagnosed CADASIL patients, 70% have an EGFr 1-6 pathogenic variant, whereas EGFr 7-34 pathogenic variant strongly predominate in the population. CONCLUSION: NOTCH3 pathogenic variant position is the most important determinant of CADASIL disease severity, with EGFr 7-34 pathogenic variant predisposing to a later onset of stroke and longer survival.
Published: 2019
Full Text: View/download PDF

5. Cerebral Amyloid Angiopathy and the Fibrinolytic System: Is Plasmin a Therapeutic Target?

Author: Chloe A Mutimer, David J. Werring, Robert L. Medcalf, Hugh S. Markus, Charithani B. Keragala, and Geoffrey Cloud
Subjects: 0301 basic medicine, Pathology, medicine.medical_specialty, Amyloid, Plasmin, medicine.medical_treatment, 03 medical and health sciences, 0302 clinical medicine, Drug Delivery Systems, mental disorders, Fibrinolysis, medicine, Humans, Fibrinolysin, Cerebral Hemorrhage, Advanced and Specialized Nursing, Intracerebral hemorrhage, Amyloid beta-Peptides, business.industry, Antibodies, Monoclonal, medicine.disease, Pathophysiology, Antifibrinolytic Agents, Cerebral Amyloid Angiopathy, 030104 developmental biology, Tranexamic Acid, Stroke prevention, Neurology (clinical), Cerebral amyloid angiopathy, Cardiology and Cardiovascular Medicine, business, 030217 neurology & neurosurgery, Tranexamic acid, medicine.drug
Abstract: Cerebral amyloid angiopathy is a devastating cause of intracerebral hemorrhage for which there is no specific secondary stroke prevention treatment. Here we review the current literature regarding cerebral amyloid angiopathy pathophysiology and treatment, as well as what is known of the fibrinolytic pathway and its interaction with amyloid. We postulate that tranexamic acid is a potential secondary stroke prevention treatment agent in sporadic cerebral amyloid angiopathy, although further research is required.
Published: 2021

6. Diabetes Mellitus, Glycemic Traits, and Cerebrovascular Disease: A Mendelian Randomization Study

Author: Eric L. Harshfield, Claudia Langenberg, Marios K. Georgakis, Rainer Malik, Nora Franceschini, Hugh S. Markus, Nicholas J. Wareham, Martin Dichgans, Georgakis, Marios K [0000-0003-3507-3659], Harshfield, Eric L [0000-0001-8767-0928], Malik, Rainer [0000-0001-9212-2520], Franceschini, Nora [0000-0001-9755-2175], Langenberg, Claudia [0000-0002-5017-7344], Wareham, Nicholas J [0000-0003-1422-2993], Markus, Hugh S [0000-0002-9794-5996], Dichgans, Martin [0000-0002-0654-387X], and Apollo - University of Cambridge Repository
Subjects: Carotid Artery Diseases, Blood Glucose, 0301 basic medicine, epidemiology [Atrophy], metabolism [Diabetes Mellitus, Type 2], Glycated Hemoglobin A, endocrine system diseases, genetics [Cerebrovascular Disorders], epidemiology [Cerebral Hemorrhage], Type 2 diabetes, 030204 cardiovascular system & hematology, 0302 clinical medicine, pathology [Brain], Insulin-Secreting Cells, metabolism [Glycated Hemoglobin], genetics [Insulin Resistance], epidemiology [Ischemic Stroke], Stroke, metabolism [Blood Glucose], 0303 health sciences, epidemiology [Diabetes Mellitus, Type 2], Brain, Mendelian Randomization Analysis, epidemiology [Hyperglycemia], White Matter, genetics [Carotid Artery Diseases], 3. Good health, Cardiology, genetics [Atrophy], medicine.medical_specialty, genetics [Cerebral Hemorrhage], metabolism [Glycated Hemoglobin A], genetics [Diabetes Mellitus, Type 2], diagnostic imaging [White Matter], 03 medical and health sciences, Insulin resistance, Internal medicine, Diabetes mellitus, Mendelian randomization, epidemiology [Carotid Artery Diseases], medicine, Genetic predisposition, Humans, Genetic Predisposition to Disease, cardiovascular diseases, ddc:610, Risk factor, diagnostic imaging [Brain], Cerebral Hemorrhage, Ischemic Stroke, 030304 developmental biology, Glycated Hemoglobin, Intracerebral hemorrhage, business.industry, Type 2 Diabetes Mellitus, genetics [Ischemic Stroke], medicine.disease, Cerebrovascular Disorders, genetics [Hyperglycemia], metabolism [Hyperglycemia], epidemiology [Cerebrovascular Disorders], 030104 developmental biology, Diabetes Mellitus, Type 2, Hyperglycemia, hemoglobin A1c protein, human, Neurology (clinical), Atrophy, Insulin Resistance, business
Abstract: RationaleType 2 diabetes mellitus (T2D) is an established risk factor for cerebrovascular disease but the mechanisms underlying this association remain elusive. Disentangling the causal effects of T2D, hyperglycemia, and pre-diabetic phenotypes (insulin resistance, β-cell dysfunction) on major etiological stroke subtypes (ischemic stroke, intracerebral hemorrhage, ischemic stroke subtypes) could inform the development of preventive strategies.ObjectiveWe employed Mendelian randomization (MR) to explore the effects of genetic predisposition to T2D, hyperglycemia, insulin resistance, and β-cell dysfunction on risk of stroke subtypes and related cerebrovascular phenotypes.Methods and ResultsWe selected instruments for genetic predisposition to T2D, HbA1c levels, fasting glucose levels, insulin resistance, and β-cell dysfunction (proxied by pro-insulin levels) based on published genome-wide association studies (up to 898,130 individuals). Applying two-sample MR, we examined associations with ischemic stroke, intracerebral hemorrhage, and ischemic stroke subtypes (large artery, cardioembolic, small vessel stroke; up to 60,341 cases and 454,450 controls). We further explored associations with the related phenotypes of carotid atherosclerosis, imaging markers of cerebral white matter integrity, and brain atrophy. Genetic predisposition to T2D and elevated HbA1c levels in the pre-diabetic range were associated with higher risk of any ischemic stroke, large artery stroke, carotid plaque and small vessel stroke. Independently of HbA1c levels, we further found genetic predisposition to insulin resistance to be associated with large artery and small vessel stroke, whereas predisposition to β-cell dysfunction was associated with small vessel stroke. Predisposition to β-cell dysfunction was further associated with intracerebral hemorrhage, lower grey matter volume, and total brain volume.ConclusionsThis study supports causal effects of T2D and hyperglycemia on large artery and small vessel stroke. We show differential effects of genetically determined insulin resistance and β-cell dysfunction on large artery and small vessel stroke that might have implications for anti-diabetic treatments targeting these mechanisms.
Published: 2021
Full Text: View/download PDF

7. Bayesian Inference Associates Rare KDR Variants with Specific Phenotypes in Pulmonary Arterial Hypertension

Author: Emilia M. Swietlik, Daniel Greene, Na Zhu, Karyn Megy, Marcella Cogliano, Smitha Rajaram, Divya Pandya, Tobias Tilly, Katie A. Lutz, Carrie C.L. Welch, Michael W. Pauciulo, Laura Southgate, Jennifer M. Martin, Carmen M. Treacy, Christopher J. Penkett, Jonathan C. Stephens, Harm J. Bogaard, Colin Church, Gerry Coghlan, Anna W. Coleman, Robin Condliffe, Christina A. Eichstaedt, Mélanie Eyries, Henning Gall, Stefano Ghio, Barbara Girerd, Ekkehard Grünig, Simon Holden, Luke Howard, Marc Humbert, David G. Kiely, Gabor Kovacs, Jim Lordan, Rajiv D. Machado, Robert V. MacKenzie Ross, Colm McCabe, Shahin Moledina, David Montani, Horst Olschewski, Joanna Pepke-Zaba, Laura Price, Christopher J. Rhodes, Werner Seeger, Florent Soubrier, Jay Suntharalingam, Mark R. Toshner, Anton Vonk Noordegraaf, John Wharton, James M. Wild, Stephen John Wort, Allan Lawrie, Martin R. Wilkins, Richard C. Trembath, Yufeng Shen, Wendy K. Chung, Andrew J. Swift, William C. Nichols, Nicholas W. Morrell, Stefan Gräf, Stephen Abbs, Lara Abulhoul, Julian Adlard, Munaza Ahmed, Timothy J. Aitman, Hana Alachkar, David J. Allsup, Philip Ancliff, Richard Antrobus, Ruth Armstrong, Gavin Arno, Sofie Ashford, William J. Astle, Anthony Attwood, Paul Aurora, Christian Babbs, Chiara Bacchelli, Tamam Bakchoul, Siddharth Banka, Tadbir Bariana, Julian Barwell, Joana Batista, Helen E. Baxendale, Phil L. Beales, David L. Bennett, Agnieszka Bierzynska, Tina Biss, Maria A.K. Bitner-Glindzicz, Graeme C. Black, Marta Bleda, Iulia Blesneac, Detlef Bockenhauer, Sara Boyce, John R. Bradley, Gerome Breen, Paul Brennan, Carole Brewer, Matthew Brown, Andrew C. Browning, Michael J. Browning, Rachel J. Buchan, Matthew S. Buckland, Teofila Bueser, Carmen Bugarin Diz, John Burn, Siobhan O. Burns, Oliver S. Burren, Nigel Burrows, Carolyn Campbell, Gerald Carr-White, Keren Carss, Ruth Casey, Mark J. Caulfield, Jenny Chambers, John Chambers, Melanie M.Y. Chan, Floria Cheng, Patrick F. Chinnery, Manali Chitre, Martin T. Christian, Jill Clayton-Smith, Maureen Cleary, Naomi Clements Brod, Elizabeth Colby, Trevor R.P. Cole, Janine Collins, Peter W. Collins, Cecilia J. Compton, H. Terence Cook, Stuart Cook, Nichola Cooper, Paul A. Corris, Nicola S. Curry, Matthew J. Daniels, Mehul Dattani, Louise C. Daugherty, John Davis, Anthony De Soyza, Sri V.V. Deevi, Timothy Dent, Charu Deshpande, Eleanor F. Dewhurst, Peter H. Dixon, Sofia Douzgou, Kate Downes, Anna M. Drazyk, Elizabeth Drewe, Daniel Duarte, Tina Dutt, J. David M. Edgar, Karen Edwards, William Egner, Melanie N. Ekani, Perry Elliott, Wendy N. Erber, Marie Erwood, Maria C. Estiu, Dafydd Gareth Evans, Gillian Evans, Tamara Everington, Hiva Fassihi, Remi Favier, Debra Fletcher, Frances A. Flinter, R. Andres Floto, Tom Fowler, James Fox, Amy J. Frary, Courtney E. French, Kathleen Freson, Mattia Frontini, Abigail Furnell, Daniel P. Gale, Vijeya Ganesan, Michael Gattens, Hossein-Ardeschir Ghofrani, J. Simon R. Gibbs, Kate Gibson, Kimberly C. Gilmour, Nicholas S. Gleadall, Sarah Goddard, Keith Gomez, Pavels Gordins, David Gosal, Jodie Graham, Luigi Grassi, Lynn Greenhalgh, Andreas Greinacher, Paolo Gresele, Philip Griffiths, Sofia Grigoriadou, Detelina Grozeva, Mark Gurnell, Scott Hackett, Charaka Hadinnapola, Rosie Hague, William M. Hague, Matthias Haimel, Matthew Hall, Helen L. Hanson, Eshika Haque, Kirsty Harkness, Andrew R. Harper, Claire L. Harris, Daniel Hart, Ahamad Hassan, Grant Hayman, Alex Henderson, Archana Herwadkar, Jonathan Hoffman, Rita Horvath, Henry Houlden, Arjan C. Houweling, Fengyuan Hu, Gavin Hudson, Aarnoud P. Huissoon, Matthew Hurles, Melita Irving, Louise Izatt, Roger James, Sally A. Johnson, Stephen Jolles, Jennifer Jolley, Dragana Josifova, Neringa Jurkute, Mary A. Kasanicki, Hanadi Kazkaz, Rashid Kazmi, Peter Kelleher, Anne M Kelly, Wilf Kelsall, Carly Kempster, Nathalie Kingston, Nils Koelling, Myrto Kostadima, Ania Koziell, Roman Kreuzhuber, Taco W. Kuijpers, Ajith Kumar, Dinakantha Kumararatne, Manju A. Kurian, Michael A. Laffan, Fiona Lalloo, Michele Lambert, Hana Lango Allen, D. Mark Layton, Claire Lentaigne, Tracy Lester, Adam P. Levine, Rachel Linger, Hilary Longhurst, Lorena E. Lorenzo, Eleni Louka, Paul A. Lyons, Bella Madan, Eamonn R. Maher, Jesmeen Maimaris, Samantha Malka, Sarah Mangles, Rutendo Mapeta, Kevin J. Marchbank, Stephen Marks, Hugh S. Markus, Hanns-Ulrich Marschall, Andrew Marshall, Mary Mathias, Emma Matthews, Heather Maxwell, Paul McAlinden, Mark I. McCarthy, Harriet McKinney, Stuart Meacham, Adam J. Mead, Sarju G. Mehta, Michel Michaelides, Carolyn Millar, Shehla N. Mohammed, Anthony T. Moore, Monika Mozere, Keith W. Muir, Andrew D. Mumford, Andrea H. Nemeth, William G. Newman, Michael Newnham, Sadia Noorani, Paquita Nurden, Jennifer O’Sullivan, Samya Obaji, Chris Odhams, Steven Okoli, Andrea Olschewski, Kai Ren Ong, S. Helen Oram, Elizabeth Ormondroyd, Willem H. Ouwehand, Claire Palles, Sofia Papadia, Soo-Mi Park, David Parry, Smita Patel, Joan Paterson, Andrew Peacock, Simon H. Pearce, Kathelijne Peerlinck, Romina Petersen, Clarissa Pilkington, Kenneth E.S. Poole, Bethan Psaila, Angela Pyle, Richard Quinton, Shamima Rahman, Anupama Rao, F. Lucy Raymond, Paula J. Rayner-Matthews, Augusto Rendon, Tara Renton, Andrew S.C. Rice, Alex Richter, Leema Robert, Irene Roberts, Sarah J. Rose, Robert Ross-Russell, Catherine Roughley, Noemi B.A. Roy, Deborah M. Ruddy, Omid Sadeghi-Alavijeh, Moin A. Saleem, Nilesh Samani, Crina Samarghitean, Alba Sanchis-Juan, Ravishankar B. Sargur, Robert N. Sarkany, Simon Satchell, Sinisa Savic, Genevieve Sayer, John A. Sayer, Laura Scelsi, Andrew M. Schaefer, Sol Schulman, Richard Scott, Marie Scully, Claire Searle, Arjune Sen, W.A. Carrock Sewell, Denis Seyres, Neil Shah, Olga Shamardina, Susan E. Shapiro, Adam C. Shaw, Keith Sibson, Lucy Side, Ilenia Simeoni, Michael A. Simpson, Matthew C. Sims, Suthesh Sivapalaratnam, Damian Smedley, Katherine R. Smith, Kenneth G.C. Smith, Katie Snape, Nicole Soranzo, Olivera Spasic-Boskovic, Simon Staines, Emily Staples, Hannah Stark, Kathleen E. Stirrups, Alex Stuckey, Petros Syrris, R. Campbell Tait, Kate Talks, Rhea Y.Y. Tan, Jenny C. Taylor, John M. Taylor, James E. Thaventhiran, Andreas C. Themistocleous, David Thomas, Ellen Thomas, Moira J. Thomas, Patrick Thomas, Kate Thomson, Adrian J. Thrasher, Chantal Thys, Marc Tischkowitz, Catherine Titterton, Cheng-Hock Toh, Ian P. Tomlinson, Matthew Traylor, Paul Treadaway, Salih Tuna, Ernest Turro, Philip Twiss, Tom Vale, Chris Van Geet, Natalie van Zuydam, Anthony M Vandersteen, Marta Vazquez-Lopez, Julie von Ziegenweidt, Annette Wagner, Quinten Waisfisz, Neil Walker, Suellen M. Walker, James S. Ware, Hugh Watkins, Christopher Watt, Andrew R. Webster, Lucy Wedderburn, Wei Wei, Steven B. Welch, Julie Wessels, Sarah K. Westbury, John-Paul Westwood, Deborah Whitehorn, James Whitworth, Andrew O.M. Wilkie, Catherine Williamson, Brian T. Wilson, Edwin K.S. Wong, Nicholas Wood, Yvette Wood, Christopher Geoffrey Woods, Emma R. Woodward, Austen Worth, Michael Wright, Katherine Yates, Patrick F.K. Yong, Timothy Young, Ping Yu, Patrick Yu-Wai-Man, Eliska Zlamalova, Russel Hirsch, R. James White, Marc Simon, David Badesch, Erika Rosenzweig, Charles Burger, Murali Chakinala, Thenappan Thenappan, Greg Elliott, Robert Simms, Harrison Farber, Robert Frantz, Jean Elwing, Nicholas Hill, Dunbar Ivy, James Klinger, Steven Nathan, Ronald Oudiz, Ivan Robbins, Robert Schilz, Terry Fortin, Jeffrey Wilt, Delphine Yung, Eric Austin, Ferhaan Ahmad, Nitin Bhatt, Tim Lahm, Adaani Frost, Zeenat Safdar, Zia Rehman, Robert Walter, Fernando Torres, Sahil Bakshi, Stephen Archer, Rahul Argula, Christopher Barnett, Raymond Benza, Ankit Desai, Veeranna Maddipati, University of Cambridge [UK] (CAM), Columbia University [New York], University of Sheffield [Sheffield], University of Cincinnati (UC), St George's, University of London, Vrije Universiteit Amsterdam [Amsterdam] (VU), Golden Jubilee National Hospital, Glasgow, Royal Free Hospital [London, UK], Heidelberg University Hospital [Heidelberg], Service de Génétique Cytogénétique et Embryologie [CHU Pitié-Salpêtrière], CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Unité de Recherche sur les Maladies Cardiovasculaires, du Métabolisme et de la Nutrition = Institute of cardiometabolism and nutrition (ICAN), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), Technische Hochschule Mittelhessen - University of Applied Sciences [Giessen] (THM), Fondazione IRCCS Policlinico San Matteo, Hypertension pulmonaire : physiopathologie et innovation thérapeutique (HPPIT), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Paris-Saclay, Universität Heidelberg [Heidelberg], Addenbrooke's Hospital, Cambridge University Hospitals NHS Foundation Trust, Imperial College London, Royal Hallamshire Hospital, University of Graz, Freeman Hospital, Royal United Hospitals Bath (RUH), Great Ormond Street Hospital for Children [London] (GOSH), Royal Papworth Hospital, Cambridge Biomedical Campus, Cambridge, United Kingdom., King‘s College London, Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Karl-Franzens-Universität [Graz, Autriche], Pulmonary medicine, ACS - Pulmonary hypertension & thrombosis, Swietlik, Emilia [0000-0002-4095-8489], Megy, Karyn [0000-0002-2826-3879], Tilly, Tobias [0000-0002-6762-5342], Stephens, Jonathan [0000-0003-2020-9330], Toshner, Mark [0000-0002-3969-6143], Morrell, Nicholas [0000-0001-5700-9792], Graf, Stefan [0000-0002-1315-8873], Apollo - University of Cambridge Repository, Unité de Recherche sur les Maladies Cardiovasculaires, du Métabolisme et de la Nutrition = Research Unit on Cardiovascular and Metabolic Diseases (ICAN), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU)-Institut de Cardiométabolisme et Nutrition = Institute of Cardiometabolism and Nutrition [CHU Pitié Salpêtrière] (IHU ICAN), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Karl-Franzens-Universität Graz, HAL-SU, Gestionnaire, British Heart Foundation, and The Academy of Medical Sciences
Subjects: 0301 basic medicine, Candidate gene, Cardiac & Cardiovascular Systems, genetic association studies, 030204 cardiovascular system & hematology, Biology, Bayesian inference, 03 medical and health sciences, 0302 clinical medicine, Missing heritability problem, pulmonary hypertension, medicine, Family history, Gene, Genetics & Heredity, Genetics, family history, Science & Technology, [SDV.MHEP] Life Sciences [q-bio]/Human health and pathology, Kinase insert domain receptor, computed tomography, General Medicine, Original Articles, medicine.disease, Pulmonary hypertension, Phenotype, 3. Good health, 030104 developmental biology, Cardiovascular System & Cardiology, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, Life Sciences & Biomedicine, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology, vascular endothelial growth factor receptor
Abstract: Supplemental Digital Content is available in the text., Background: Approximately 25% of patients with pulmonary arterial hypertension (PAH) have been found to harbor rare mutations in disease-causing genes. To identify missing heritability in PAH, we integrated deep phenotyping with whole-genome sequencing data using Bayesian statistics. Methods: We analyzed 13 037 participants enrolled in the NBR study (NIHR BioResource—Rare Diseases), of which 1148 were recruited to the PAH domain. To test for genetic associations between genes and selected phenotypes of pulmonary hypertension, we used the Bayesian rare variant association method BeviMed. Results: Heterozygous, high impact, likely loss-of-function variants in the kinase insert domain receptor (KDR) gene were strongly associated with significantly reduced transfer coefficient for carbon monoxide (posterior probability=0.989) and older age at diagnosis (posterior probability=0.912). We also provide evidence for familial segregation of a rare nonsense KDR variant with these phenotypes. On computed tomographic imaging of the lungs, a range of parenchymal abnormalities were observed in the 5 patients harboring these predicted deleterious variants in KDR. Four additional PAH cases with rare likely loss-of-function variants in KDR were independently identified in the US PAH Biobank cohort with similar phenotypic characteristics. Conclusions: The Bayesian inference approach allowed us to independently validate KDR, which encodes for the VEGFR2 (vascular endothelial growth factor receptor 2), as a novel PAH candidate gene. Furthermore, this approach specifically associated high impact likely loss-of-function variants in the genetically constrained gene with distinct phenotypes. These findings provide evidence for KDR being a clinically actionable PAH gene and further support the central role of the vascular endothelium in the pathobiology of PAH.
Published: 2020
Full Text: View/download PDF

8. Inherited risk of dementia and the progression of cerebral small vessel disease and inflammatory markers in cognitively healthy midlife adults: the PREVENT-Dementia study

Author: Craig W. Ritchie, Graciela Muniz-Terrera, Maria-Eleni Dounavi, Hugh S. Markus, Elijah Mak, Li Su, John T. O'Brien, Audrey Low, James D Stefaniak, Karen Ritchie, Low, Audrey [0000-0002-2520-454X], Mak, Elijah [0000-0002-6437-8024], Dounavi, Maria [0000-0001-8287-346X], Markus, Hugh [0000-0002-9794-5996], O'Brien, John [0000-0002-0837-5080], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Male, Aging, Inflammasomes, Apolipoprotein E4, Disease, Fibrinogen, Healthy Aging, 0302 clinical medicine, Cognition, White matter hyperintensities, Medicine, Family history, Episodic memory, General Neuroscience, Regular Article, Middle Aged, Alzheimer's disease, White Matter, C-Reactive Protein, Cardiology, Disease Progression, Female, medicine.symptom, Cerebral microbleeds, medicine.drug, Risk, medicine.medical_specialty, Heterozygote, APOE4, Cerebral small vessel disease, Inflammation, 03 medical and health sciences, Alzheimer Disease, Internal medicine, mental disorders, Dementia, Humans, Genetic Predisposition to Disease, Genetic Association Studies, business.industry, medicine.disease, Hyperintensity, 030104 developmental biology, Risk factors, Cerebral Small Vessel Diseases, Neurology (clinical), Small vessel, Geriatrics and Gerontology, business, 030217 neurology & neurosurgery, Biomarkers, Developmental Biology
Abstract: Cerebral small vessel disease (SVD) and inflammation are increasingly recognized as key contributors to Alzheimer's disease (AD), although the timing, trajectory, and relation between them early in the disease process is unclear. Therefore, to investigate very early-stage changes, we compared 158 healthy midlife adults with and without inherited AD predisposition (APOE4 carriership (38% positive), parental family history (FH) of dementia (54% positive)) on markers of SVD (white matter hyperintensities (WMH), cerebral microbleeds), and inflammation (C-reactive protein (CRP), fibrinogen), cross-sectionally and longitudinally over two years. While WMH severity was comparable between groups at baseline, longitudinal progression of WMH was greater in at-risk groups (APOE4+ and FH+). Topographically, APOE4 was associated exclusively with deep, but not periventricular, WMH progression after adjusting for FH. Conversely, APOE4 carriers displayed lower CRP levels than noncarriers, but not fibrinogen. Furthermore, interaction analysis showed that FH moderated the effect of SVD and inflammation on reaction time, an early feature of SVD, but not episodic memory or executive function. Findings suggest that vascular and inflammatory changes could occur decades before dementia onset, and may be of relevance in predicting incipient clinical progression., Highlights • Heritable risk factors related to SVD progression, despite lower levels of inflammation. • SVD progression had more pronounced adverse effects on reaction time in at-risk individuals. • Association between SVD and inflammation was stronger in those at-risk.
Published: 2020
Full Text: View/download PDF

9. Genome-wide association study of MRI markers of cerebral small vessel disease in 42,310 participants

Author: Hugh S. Markus, Elodie Persyn, Matthew Traylor, Ken B. Hanscombe, Joanna M. M. Howson, and Cathryn M. Lewis
Subjects: 0301 basic medicine, Adult, Male, Candidate gene, Genetics of the nervous system, Cerebrovascular disorders, Science, General Physics and Astronomy, Genome-wide association study, Disease, Bioinformatics, Genome-wide association studies, Polymorphism, Single Nucleotide, General Biochemistry, Genetics and Molecular Biology, Article, 03 medical and health sciences, 0302 clinical medicine, Leukoencephalopathies, Fractional anisotropy, medicine, Dementia, Humans, lcsh:Science, Stroke, Genetic association, Aged, Multidisciplinary, business.industry, General Chemistry, Middle Aged, medicine.disease, Magnetic Resonance Imaging, Hyperintensity, 030104 developmental biology, Gene Ontology, Gene Expression Regulation, Genetic Loci, Organ Specificity, Cerebral Small Vessel Diseases, lcsh:Q, Female, business, Transcriptome, 030217 neurology & neurosurgery, Biomarkers, Genome-Wide Association Study
Abstract: Cerebral small vessel disease is a major cause of stroke and dementia, but its genetic basis is incompletely understood. We perform a genetic study of three MRI markers of the disease in UK Biobank imaging data and other sources: white matter hyperintensities (N = 42,310), fractional anisotropy (N = 17,663) and mean diffusivity (N = 17,467). Our aim is to better understand the disease pathophysiology. Across the three traits, we identify 31 loci, of which 21 were previously unreported. We perform a transcriptome-wide association study to identify associations with gene expression in relevant tissues, identifying 66 associated genes across the three traits. This genetic study provides insights into the understanding of the biological mechanisms underlying small vessel disease., Cerebral small vessel disease (CSVD) is a major cause of stroke and associated with structural changes of the brain. Here, Persyn et al. perform genome-wide association studies for magnetic resonance imaging (MRI) markers of CSVD, explore genetic correlations and prioritize candidate genes.
Published: 2020
Full Text: View/download PDF

10. The role of haematological traits in risk of ischaemic stroke and its subtypes

Author: Eric L. Harshfield, Matthew C Sims, Hugh S. Markus, Matthew Traylor, Willem H. Ouwehand, Harshfield, Eric [0000-0001-8767-0928], Ouwehand, Willem [0000-0002-7744-1790], Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, medicine.medical_specialty, Clotting cascade, Population, Genome-wide association study, 030204 cardiovascular system & hematology, Fibrinogen, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, Mendelian randomization, medicine, Genetics, cardiovascular diseases, Platelet activation, education, Stroke, education.field_of_study, Hematology, business.industry, Original Articles, medicine.disease, Thrombosis, 030104 developmental biology, FOS: Biological sciences, Immunology, Neurology (clinical), business, Haematology, medicine.drug
Abstract: Whether haematological traits contribute equally to all ischaemic stroke subtypes is unclear. By analysing summary statistics from genome-wide association studies of haematological traits and MEGASTROKE, Harshfield et al. show that genetically altered levels of several coagulation factors are associated with ischaemic, cardioembolic, and large-artery stroke, but not small-vessel stroke., Thrombosis and platelet activation play a central role in stroke pathogenesis, and antiplatelet and anticoagulant therapies are central to stroke prevention. However, whether haematological traits contribute equally to all ischaemic stroke subtypes is uncertain. Furthermore, identification of associations with new traits may offer novel treatment opportunities. The aim of this research was to ascertain causal relationships between a wide range of haematological traits and ischaemic stroke and its subtypes. We obtained summary statistics from 27 published genome-wide association studies of haematological traits involving over 375 000 individuals, and genetic associations with stroke from the MEGASTROKE Consortium (n = 67 000 stroke cases). Using two-sample Mendelian randomization we analysed the association of genetically elevated levels of 36 blood cell traits (platelets, mature/immature red cells, and myeloid/lymphoid/compound white cells) and 49 haemostasis traits (including clotting cascade factors and markers of platelet function) with risk of developing ischaemic (AIS), cardioembolic (CES), large artery (LAS), and small vessel stroke (SVS). Several factors on the intrinsic clotting pathway were significantly associated (P < 3.85 × 10−4) with CES and LAS, but not with SVS (e.g. reduced factor VIII activity with AIS/CES/LAS; raised factor VIII antigen with AIS/CES; and increased factor XI activity with AIS/CES). On the common pathway, increased gamma (γ′) fibrinogen was significantly associated with AIS/CES. Furthermore, elevated plateletcrit was significantly associated with AIS/CES, eosinophil percentage of white cells with LAS, and thrombin-activatable fibrinolysis inhibitor activation peptide antigen with AIS. We also conducted a follow-up analysis in UK Biobank, which showed that amongst individuals with atrial fibrillation, those with genetically lower levels of factor XI are at reduced risk of AIS compared to those with normal levels of factor XI. These results implicate components of the intrinsic and common pathways of the clotting cascade, as well as several other haematological traits, in the pathogenesis of CES and possibly LAS, but not SVS. The lack of associations with SVS suggests thrombosis may be less important for this stroke subtype. Plateletcrit and factor XI are potentially tractable new targets for secondary prevention of ischaemic stroke, while factor VIII and γ′ fibrinogen require further population-based studies to ascertain their possible aetiological roles.
Published: 2020

11. Peak Width of Skeletonized Mean Diffusivity as a Marker of Diffuse Cerebrovascular Damage

Author: John T. O'Brien, Maura Malpetti, Nicolas Nicastro, James B. Rowe, George Savulich, James D Stefaniak, Leonidas Chouliaras, Audrey Low, Hugh S. Markus, Elijah Mak, Low, Audrey [0000-0002-2520-454X], Mak, Elijah [0000-0002-6437-8024], Malpetti, Maura [0000-0001-8923-9656], Chouliaras, Leonidas [0000-0002-3052-3879], Markus, Hugh [0000-0002-9794-5996], Rowe, James [0000-0001-7216-8679], O'Brien, John [0000-0002-0837-5080], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, cognition, medicine.medical_specialty, small vessel disease, Hyperintensities, behavioral disciplines and activities, Progressive supranuclear palsy, lcsh:RC321-571, White matter, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, mental disorders, medicine, Dementia, magnetic resonance imaging, lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry, Original Research, medicine.diagnostic_test, business.industry, Dementia with Lewy bodies, General Neuroscience, Magnetic resonance imaging, white matter hyperintensities, medicine.disease, diffusion tensor imaging, Hyperintensity, ddc:616.8, 030104 developmental biology, medicine.anatomical_structure, Cardiology, business, 030217 neurology & neurosurgery, Diffusion MRI, Frontotemporal dementia, Neuroscience, dementia
Abstract: Background: The peak width of skeletonized mean diffusivity (PSMD) has been proposed as a fully automated imaging marker of relevance to cerebral small vessel disease (SVD). We assessed PSMD in relation to conventional SVD markers, global measures of neurodegeneration, and cognition.Methods: 145 participants underwent 3T brain MRI and cognitive assessment. 112 were patients with mild cognitive impairment, Alzheimer's disease, progressive supranuclear palsy, dementia with Lewy bodies, or frontotemporal dementia. PSMD, SVD burden [white matter hyperintensities (WMH), enlarged perivascular spaces (EPVS), microbleeds, lacunes], average mean diffusivity (MD), gray matter (GM), white matter (WM), and total intracranial volume were quantified. Robust linear regression was conducted to examine associations between variables. Dominance analysis assessed the relative importance of markers in predicting various outcomes. Regional analyses examined spatial overlap between PSMD and WMH.Results: PSMD was associated with global and regional SVD measures, especially WMH and microbleeds. Dominance analysis demonstrated that among SVD markers, WMH was the strongest predictor of PSMD. Furthermore, PSMD was more closely associated to WMH than with GM and WM volumes. PSMD was associated with WMH across all regions, and correlations were not significantly stronger in corresponding regions (e.g., frontal PSMD and frontal WMH) compared to non-corresponding regions. PSMD outperformed all four conventional SVD markers and MD in predicting cognition, but was comparable to GM and WM volumes.Discussion: PSMD was robustly associated with established SVD markers. This new measure appears to be a marker of diffuse brain injury, largely due to vascular pathology, and may be a useful and convenient metric of overall cerebrovascular burden.
Published: 2020
Full Text: View/download PDF

12. Influence of Genetic Variation in PDE3A on Endothelial Function and Stroke

Author: Matthew Traylor, Jaeyoon Chung, Christopher D. Anderson, Rainer Malik, Sandro Marini, Martin Dichgans, Leo-Pekka Lyytikäinen, Terho Lehtimäki, Mika Kähönen, Hugh S. Markus, Ali Amin Al Olama, Olli T. Raitakari, Markus, Hugh [0000-0002-9794-5996], Apollo - University of Cambridge Repository, Lääketieteen ja terveysteknologian tiedekunta - Faculty of Medicine and Health Technology, and Tampere University
Subjects: 0301 basic medicine, Adult, Male, Adolescent, Pregnancy Complications, Cardiovascular, Genome-wide association study, Bioinformatics, Polymorphism, Single Nucleotide, Brain Ischemia, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Pregnancy, Risk Factors, Genetic variation, Internal Medicine, Medicine, Humans, genetics, Genetic Predisposition to Disease, Child, Stroke, Retrospective Studies, genome-wide association study, business.industry, Sisätaudit - Internal medicine, Genetic data, Genetic Variation, Middle Aged, medicine.disease, stroke, Cyclic Nucleotide Phosphodiesterases, Type 3, 3. Good health, Vascular endothelium, Vasodilation, 030104 developmental biology, Ischemic stroke, Hypertension, Female, Endothelium, Vascular, business, cyclic nucleotide phosphodiesterases type 3, vascular endothelium, 030217 neurology & neurosurgery, Function (biology), Follow-Up Studies
Abstract: We aimed to characterize the genetics of endothelial function and how this influences risk for cardiovascular diseases such as ischemic stroke. We integrated genetic data from a study of ultrasound flow-mediated dilatation of brachial artery in adolescents from ALSPAC (Avon Longitudinal Study of Parents and Children; n=5214) with a study of ischemic stroke (MEGASTROKE: n=60 341 cases and 452 969 controls) to identify variants that confer risk of ischemic stroke through altered endothelial function. We identified a variant in PDE3A (Phosphodiesterase 3A), encoding phosphodiesterase 3A, which was associated with flow-mediated dilatation in adolescents (9–12 years of age; β[SE], 0.38 [0.070]; P =3.8×10 −8 ) and confers risk of ischemic stroke (odds ratio, 1.04 [95% CI, 1.02–1.06]; P =5.2×10 −6 ). Bayesian colocalization analyses showed the same underlying variation is likely to lead to both associations (posterior probability, 97%). The same variant was associated with flow-mediated dilatation in a second study in young adults (age, 24–27 years; β[SE], 0.47 [0.23]; P =0.047) but not in older adults (β[SE], −0.012 [0.13]; P =0.89). We conclude that a genetic variant in PDE3A influences endothelial function in early life and leads to increased risk of ischemic stroke. Subtle, measurable changes to the vasculature that are influenced by genetics also influence risk of ischemic stroke.
Published: 2020
Full Text: View/download PDF

13. Network neuroscience of apathy in cerebrovascular disease

Author: Masud Husain, Hugh S. Markus, Frank-Erik de Leeuw, Michael O'Sullivan, Jonathan Tay, Thomas R. Barrick, Danuta M. Lisiecka-Ford, Anil M. Tuladhar, Anne Forster, Robin G. Morris, Matthew J. Hollocks, Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Nerve net, Apathy, Cerebral small vessel disease, Disease, 03 medical and health sciences, 0302 clinical medicine, Cognition, medicine, Humans, Cerebrovascular disease, Stroke, General Neuroscience, medicine.disease, Disorders of movement Donders Center for Medical Neuroscience [Radboudumc 3], Cerebrovascular Disorders, 030104 developmental biology, medicine.anatomical_structure, Small vessel, medicine.symptom, Networks, Nerve Net, Psychology, Neuroscience, Goals, 030217 neurology & neurosurgery
Abstract: Contains fulltext : 220510.pdf (Publisher’s version ) (Closed access) Apathy is a reduction in motivated goal-directed behavior (GDB) that is prevalent in cerebrovascular disease, providing an important opportunity to study the mechanistic underpinnings of motivation in humans. Focal lesions, such as those seen in stroke, have been crucial in developing models of brain regions underlying motivated behavior, while studies of cerebral small vessel disease (SVD) have helped define the connections between brain regions supporting such behavior. However, current lesion-based models cannot fully explain the neurobiology of apathy in stroke and SVD. To address this, we propose a network-based model which conceptualizes apathy as the result of damage to GDB-related networks. A review of the current evidence suggests that cerebrovascular disease-related pathology can lead to network changes outside of initially damaged territories, which may propagate to regions that share structural or functional connections. The presentation and longitudinal trajectory of apathy in stroke and SVD may be the result of these network changes. Distinct subnetworks might support cognitive components of GDB, the disruption of which results in specific symptoms of apathy. This network-based model of apathy may open new approaches for investigating its underlying neurobiology, and presents novel opportunities for its diagnosis and treatment.
Published: 2020
Full Text: View/download PDF

14. Genome‐wide meta‐analysis identifies 3 novel loci associated with stroke

Author: Rainer Malik, Kristiina Rannikmäe, Matthew Traylor, Stéphanie Debette, Cathie Sudlow, Muralidharan Sargurupremraj, Marios K. Georgakis, Hugh S. Markus, Jemma C. Hopewell, Martin Dichgans, Ludwig-Maximilians-Universität München (LMU), University of Edinburgh, Bordeaux population health (BPH), Université de Bordeaux (UB)-Institut de Santé Publique, d'Épidémiologie et de Développement (ISPED)-Institut National de la Santé et de la Recherche Médicale (INSERM), University of Cambridge [UK] (CAM), Traylor, Matthew [0000-0001-6624-8621], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Collagen Type IV, statistics & numerical data [Databases, Factual], Databases, Factual, Nitric Oxide Synthase Type III, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Single-nucleotide polymorphism, Genome-wide association study, genetics [Protein Serine-Threonine Kinases], Biology, Protein Serine-Threonine Kinases, Brief Communication, genetics [Protein-Serine-Threonine Kinases], 03 medical and health sciences, 0302 clinical medicine, Gene Frequency, Polymorphism (computer science), Risk Factors, Mendelian randomization, Genetic variation, medicine, genetics [Protein-Tyrosine Kinases], Humans, Genetic Predisposition to Disease, ddc:610, genetics [Collagen Type IV], Allele frequency, Stroke, Genetics, [SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], Mendelian Randomization Analysis, genetics [Nitric Oxide Synthase Type III], COL4A1 protein, human, Protein-Tyrosine Kinases, medicine.disease, Protein-Serine-Threonine Kinases, Dyrk kinase, Europe, 030104 developmental biology, Neurology, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, genetics [Stroke], Neurology (clinical), NOS3 protein, human, Brief Communications, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: We conducted a European-only and transancestral genome-wide association meta-analysis in 72,147 stroke patients and 823,869 controls using data from UK Biobank (UKB) and the MEGASTROKE consortium. We identified an exonic polymorphism in NOS3 (rs1799983, p.Glu298Asp; p = 2.2E-8, odds ratio [OR] = 1.05, 95% confidence interval [CI] = 1.04-1.07) and variants in an intron of COL4A1 (rs9521634; p = 3.8E-8, OR = 1.04, 95% CI = 1.03-1.06) and near DYRK1A (rs720470; p = 6.1E-9, OR = 1.05, 95% CI = 1.03-1.07) at genome-wide significance for stroke. Effect sizes of known stroke loci were highly correlated between UKB and MEGASTROKE. Using Mendelian randomization, we further show that genetic variation in the nitric oxide synthase-nitric oxide pathway in part affects stroke risk via variation in blood pressure. Ann Neurol 2018;84:934-939.
Published: 2018
Full Text: View/download PDF

15. Type 2 diabetes, glucose, insulin, BMI, and ischemic stroke subtypes

Author: Marju Orho-Melander, Claudia Langenberg, Robert A. Scott, Matthew Traylor, Susanna C. Larsson, George Hindy, Nicholas J. Wareham, Olle Melander, Hugh S. Markus, and Sudha Seshadri
Subjects: Blood Glucose, 0301 basic medicine, medicine.medical_specialty, medicine.medical_treatment, Type 2 diabetes, Polymorphism, Single Nucleotide, Article, Body Mass Index, Brain Ischemia, Brain ischemia, 03 medical and health sciences, 0302 clinical medicine, Risk Factors, Diabetes mellitus, Internal medicine, Mendelian randomization, Odds Ratio, Humans, Insulin, Medicine, Stroke, business.industry, Fasting, Odds ratio, Mendelian Randomization Analysis, medicine.disease, 030104 developmental biology, Endocrinology, Diabetes Mellitus, Type 2, Cardiology, Regression Analysis, Neurology (clinical), business, Body mass index, Biomarkers, 030217 neurology & neurosurgery
Abstract: Objective:To implement a mendelian randomization (MR) approach to determine whether type 2 diabetes mellitus (T2D), fasting glucose, fasting insulin, and body mass index (BMI) are causally associated with specific ischemic stroke subtypes.Methods:MR estimates of the association between each possible risk factor and ischemic stroke subtypes were calculated with inverse-variance weighted (conventional) and weighted median approaches, and MR-Egger regression was used to explore pleiotropy. The number of single nucleotide polymorphisms (SNPs) used as instrumental variables was 49 for T2D, 36 for fasting glucose, 18 for fasting insulin, and 77 for BMI. Genome-wide association study data of SNP-stroke associations were derived from METASTROKE and the Stroke Genetics Network (n = 18,476 ischemic stroke cases and 37,296 controls).Results:Conventional MR analysis showed associations between genetically predicted T2D and large artery stroke (odds ratio [OR] 1.28, 95% confidence interval [CI] 1.16–1.40, p = 3.3 × 10−7) and small vessel stroke (OR 1.21, 95% CI 1.10–1.33, p = 8.9 × 10−5) but not cardioembolic stroke (OR 1.06, 95% CI 0.97–1.15, p = 0.17). The association of T2D with large artery stroke but not small vessel stroke was consistent in a sensitivity analysis using the weighted median method, and there was no evidence of pleiotropy. Genetically predicted fasting glucose and fasting insulin levels and BMI were not statistically significantly associated with any ischemic stroke subtype.Conclusions:This study provides support that T2D may be causally associated with large artery stroke.
Published: 2017
Full Text: View/download PDF

16. Cerebrovascular abnormalities in Alzheimer’s dementia: a more tractable treatment target?

Author: Hugh S. Markus
Subjects: 0301 basic medicine, Cerebral atrophy, medicine.medical_specialty, business.industry, medicine.disease, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, Treatment targets, Internal medicine, Cardiology, Medicine, Alzheimer s dementia, Neurology (clinical), business, Cognitive impairment, 030217 neurology & neurosurgery
Published: 2017
Full Text: View/download PDF

17. An Examination of Polygenic Score Risk Prediction in Individuals With First-Episode Psychosis

Author: Tiago Reis Marques, Zerrin Atakan, Marta Di Forti, Valeria Mondelli, Robin M. Murray, Shubulade Smith, Matthew Traylor, Hugh S. Markus, Khalida Ismail, Fiona Gaughran, Jack Euesden, Paul F. O'Reilly, John Powell, Charles Curtis, Anna Kolliakou, Jonathan R. I. Coleman, Poonam Gardner-Sood, Katherine J. Aitchison, Carmine M. Pariante, Anthony S. David, Diana Prata, Stephen Newhouse, Cathryn M. Lewis, Kathryn Greenwood, Evangelos Vassos, Gerome Breen, Oleysa Ajnakina, Hamel Patel, Paola Dazzan, and Conrad Iyegbe
Subjects: 0301 basic medicine, Male, Multifactorial Inheritance, COMPLEX DISEASES, Genome-wide association study, AFRICAN, FAMILY-HISTORY, 0302 clinical medicine, Risk Factors, GWAS, Young adult, Family history, POPULATION, 1ST EPISODE PSYCHOSIS, African Continental Ancestry Group, Psychiatry, education.field_of_study, PSYCHIATRIC-DISORDERS, 11 Medical And Health Sciences, RANDOMIZED CONTROLLED-TRIAL, Explained variation, Risk prediction, Schizophrenia, Female, Psychology, Life Sciences & Biomedicine, Adult, Psychosis, medicine.medical_specialty, Genotype, Population, European Continental Ancestry Group, Black People, White People, 17 Psychology And Cognitive Sciences, 03 medical and health sciences, Young Adult, Polygenic score, medicine, Genetics, Humans, Genetic Predisposition to Disease, GENOME-WIDE ASSOCIATION, education, Biological Psychiatry, Science & Technology, Case-control study, Neurosciences, SOUTH LONDON, 06 Biological Sciences, medicine.disease, 030104 developmental biology, Psychotic Disorders, Case-Control Studies, Neurosciences & Neurology, 030217 neurology & neurosurgery
Abstract: Background\ud Polygenic risk scores (PRSs) have successfully summarized genome-wide effects of genetic variants in schizophrenia with significant predictive power. In a clinical sample of first-episode psychosis (FEP) patients, we estimated the ability of PRSs to discriminate case-control status and to predict the development of schizophrenia as opposed to other psychoses.\ud \ud Methods\ud The sample (445 case and 265 control subjects) was genotyped on the Illumina HumanCore Exome BeadChip with an additional 828 control subjects of African ancestry genotyped on the Illumina Multi-Ethnic Genotyping Array. To calculate PRSs, we used the results from the latest Psychiatric Genomics Consortium schizophrenia meta-analysis. We examined the association of PRSs with case-control status and with schizophrenia versus other psychoses in European and African ancestry FEP patients and in a second sample of 248 case subjects with chronic psychosis.\ud \ud Results\ud PRS had good discriminative ability of case-control status in FEP European ancestry individuals (9.4% of the variance explained, p < 10−6), but lower in individuals of African ancestry (R2 = 1.1%, p = .004). Furthermore, PRS distinguished European ancestry case subjects who went on to acquire a schizophrenia diagnosis from those who developed other psychotic disorders (R2 = 9.2%, p = .002).\ud \ud Conclusions\ud PRS was a powerful predictor of case-control status in a European sample of patients with FEP, even though a large proportion did not have an established diagnosis of schizophrenia at the time of assessment. PRS was significantly different between those case subjects who developed schizophrenia from those who did not, although the discriminative accuracy may not yet be sufficient for clinical utility in FEP.
Published: 2017
Full Text: View/download PDF

18. Biallelic Mutation of ARHGEF18, Involved in the Determination of Epithelial Apicobasal Polarity, Causes Adult-Onset Retinal Degeneration

Author: Gavin Arno, Keren J. Carss, Sarah Hull, Ceniz Zihni, Anthony G. Robson, Alessia Fiorentino, Alison J. Hardcastle, Graham E. Holder, Michael E. Cheetham, Vincent Plagnol, Anthony T. Moore, F. Lucy Raymond, Karl Matter, Maria S. Balda, Andrew R. Webster, Graeme Black, Georgina Hall, Stuart Ingram, Rachel Gillespie, Forbes Manson, Panagiotis Sergouniotis, Chris Inglehearn, Carmel Toomes, Manir Ali, Martin McKibbin, James Poulter, Kamron Khan, Emma Lord, Andrea Nemeth, Susan Downes, Stephanie Halford, Jing Yu, Stefano Lise, Nikos Ponitkos, Michel Michaelides, Veronica van Heyningen, Timothy Aitman, Hana Alachkar, Sonia Ali, Louise Allen, David Allsup, Gautum Ambegaonkar, Julie Anderson, Richard Antrobus, Ruth Armstrong, Gururaj Arumugakani, Sofie Ashford, William Astle, Antony Attwood, Steve Austin, Chiara Bacchelli, Tamam Bakchoul, Tadbir K. Bariana, Helen Baxendale, David Bennett, Claire Bethune, Shahnaz Bibi, Maria Bitner-Glindzicz, Marta Bleda, Harm Boggard, Paula Bolton-Maggs, Claire Booth, John R. Bradley, Angie Brady, Matthew Brown, Michael Browning, Christine Bryson, Siobhan Burns, Paul Calleja, Natalie Canham, Jenny Carmichael, Keren Carss, Mark Caulfield, Elizabeth Chalmers, Anita Chandra, Patrick Chinnery, Manali Chitre, Colin Church, Emma Clement, Naomi Clements-Brod, Virginia Clowes, Gerry Coghlan, Peter Collins, Nichola Cooper, Amanda Creaser-Myers, Rosa DaCosta, Louise Daugherty, Sophie Davies, John Davis, Minka De Vries, Patrick Deegan, Sri V.V. Deevi, Charu Deshpande, Lisa Devlin, Eleanor Dewhurst, Rainer Doffinger, Natalie Dormand, Elizabeth Drewe, David Edgar, William Egner, Wendy N. Erber, Marie Erwood, Tamara Everington, Remi Favier, Helen Firth, Debra Fletcher, Frances Flinter, James C. Fox, Amy Frary, Kathleen Freson, Bruce Furie, Abigail Furnell, Daniel Gale, Alice Gardham, Michael Gattens, Neeti Ghali, Pavandeep K. Ghataorhe, Rohit Ghurye, Simon Gibbs, Kimberley Gilmour, Paul Gissen, Sarah Goddard, Keith Gomez, Pavel Gordins, Stefan Gräf, Daniel Greene, Alan Greenhalgh, Andreas Greinacher, Sofia Grigoriadou, Detelina Grozeva, Scott Hackett, Charaka Hadinnapola, Rosie Hague, Matthias Haimel, Csaba Halmagyi, Tracey Hammerton, Daniel Hart, Grant Hayman, Johan W.M. Heemskerk, Robert Henderson, Anke Hensiek, Yvonne Henskens, Archana Herwadkar, Simon Holden, Muriel Holder, Susan Holder, Fengyuan Hu, Aarnoud Huissoon, Marc Humbert, Jane Hurst, Roger James, Stephen Jolles, Dragana Josifova, Rashid Kazmi, David Keeling, Peter Kelleher, Anne M. Kelly, Fiona Kennedy, David Kiely, Nathalie Kingston, Ania Koziell, Deepa Krishnakumar, Taco W. Kuijpers, Dinakantha Kumararatne, Manju Kurian, Michael A. Laffan, Michele P. Lambert, Hana Lango Allen, Allan Lawrie, Sara Lear, Melissa Lees, Claire Lentaigne, Ri Liesner, Rachel Linger, Hilary Longhurst, Lorena Lorenzo, Rajiv Machado, Rob Mackenzie, Robert MacLaren, Eamonn Maher, Jesmeen Maimaris, Sarah Mangles, Ania Manson, Rutendo Mapeta, Hugh S. Markus, Jennifer Martin, Larahmie Masati, Mary Mathias, Vera Matser, Anna Maw, Elizabeth McDermott, Coleen McJannet, Stuart Meacham, Sharon Meehan, Karyn Megy, Sarju Mehta, Carolyn M. Millar, Shahin Moledina, Anthony Moore, Nicholas Morrell, Andrew Mumford, Sai Murng, Elaine Murphy, Sergey Nejentsev, Sadia Noorani, Paquita Nurden, Eric Oksenhendler, Willem H. Ouwehand, Sofia Papadia, Soo-Mi Park, Alasdair Parker, John Pasi, Chris Patch, Joan Paterson, Jeanette Payne, Andrew Peacock, Kathelijne Peerlinck, Christopher J. Penkett, Joanna Pepke-Zaba, David J. Perry, Val Pollock, Gary Polwarth, Mark Ponsford, Waseem Qasim, Isabella Quinti, Stuart Rankin, Julia Rankin, Karola Rehnstrom, Evan Reid, Christopher J. Rhodes, Michael Richards, Sylvia Richardson, Alex Richter, Irene Roberts, Matthew Rondina, Elisabeth Rosser, Catherine Roughley, Kevin Rue-Albrecht, Crina Samarghitean, Alba Sanchis-Juan, Richard Sandford, Saikat Santra, Ravishankar Sargur, Sinisa Savic, Sol Schulman, Harald Schulze, Richard Scott, Marie Scully, Suranjith Seneviratne, Carrock Sewell, Olga Shamardina, Debbie Shipley, Ilenia Simeoni, Suthesh Sivapalaratnam, Kenneth Smith, Aman Sohal, Laura Southgate, Simon Staines, Emily Staples, Hans Stauss, Penelope Stein, Jonathan Stephens, Kathleen Stirrups, Sophie Stock, Jay Suntharalingam, R. Campbell Tait, Kate Talks, Yvonne Tan, Jecko Thachil, James Thaventhiran, Ellen Thomas, Moira Thomas, Dorothy Thompson, Adrian Thrasher, Marc Tischkowitz, Catherine Titterton, Cheng-Hock Toh, Mark Toshner, Carmen Treacy, Richard Trembath, Salih Tuna, Wojciech Turek, Ernest Turro, Chris Van Geet, Marijke Veltman, Julie Vogt, Julie von Ziegenweldt, Anton Vonk Noordegraaf, Emma Wakeling, Ivy Wanjiku, Timothy Q. Warner, Evangeline Wassmer, Hugh Watkins, Andrew Webster, Steve Welch, Sarah Westbury, John Wharton, Deborah Whitehorn, Martin Wilkins, Lisa Willcocks, Catherine Williamson, Geoffrey Woods, John Wort, Nigel Yeatman, Patrick Yong, Tim Young, Ping Yu, Pediatric surgery, Molecular cell biology and Immunology, Pulmonary medicine, ACS - Pulmonary hypertension & thrombosis, APH - Quality of Care, Amsterdam Reproduction & Development (AR&D), RS: CARIM - R1.04 - Clinical thrombosis and haemostasis, MUMC+: DA CDL Algemeen (9), and Med Microbiol, Infect Dis & Infect Prev
Subjects: Male, 0301 basic medicine, Retinal degeneration, Biallelic Mutation, RHOA, PROTEIN, Eye, Medical and Health Sciences, ACTIVATION, chemistry.chemical_compound, 0302 clinical medicine, 2.1 Biological and endogenous factors, Missense mutation, Exome, Aetiology, Genetics (clinical), Genetics & Heredity, Genetics, biology, Retinal Degeneration, Cell Polarity, MOSAIC EYES, Biological Sciences, Middle Aged, Phenotype, inherited retinal dystrophy, Pedigree, UK Inherited Retinal Disease Consortium, Female, apicobasal polarity, Retinal Dystrophies, Adult, NIHR Bioresource - Rare Diseases Consortium, ARHGEF18, Genotype, Mutation, Missense, Nerve Tissue Proteins, Retina, 03 medical and health sciences, Rare Diseases, retinitis pigmentosa, Report, CRB1, Retinitis pigmentosa, medicine, Humans, Amino Acid Sequence, Eye Proteins, Eye Disease and Disorders of Vision, Alleles, Human Genome, Neurosciences, Genetic Variation, Membrane Proteins, Epithelial Cells, Retinal, CELL FEATURES, medicine.disease, NUCLEOTIDE EXCHANGE FACTOR, p114RhoGEF, 030104 developmental biology, INTEGRATIVE GENOMICS VIEWER, OKO-MEDUZY, chemistry, Mutation, MORPHOGENESIS, 030221 ophthalmology & optometry, biology.protein, Missense, rhoA GTP-Binding Protein, Rho Guanine Nucleotide Exchange Factors, Genome-Wide Association Study
Abstract: Mutations in more than 250 genes are implicated in inherited retinal dystrophy; the encoded proteins are involved in a broad spectrum of pathways. The presence of unsolved families after highly parallel sequencing strategies suggests that further genes remain to be identified. Whole-exome and -genome sequencing studies employed here in large cohorts of affected individuals revealed biallelic mutations in ARHGEF18 in three such individuals. ARHGEF18 encodes ARHGEF18, a guanine nucleotide exchange factor that activates RHOA, a small GTPase protein that is a key component of tight junctions and adherens junctions. This biological pathway is known to be important for retinal development and function, as mutation of CRB1, encoding another component, causes retinal dystrophy. The retinal structure in individuals with ARHGEF18 mutations resembled that seen in subjects with CRB1 mutations. Five mutations were found on six alleles in the three individuals: c.808A>G (p.Thr270Ala), c.1617+5G>A (p.Asp540Glyfs ∗ 63), c.1996C>T (p.Arg666 ∗ ), c.2632G>T (p.Glu878 ∗ ), and c.2738_2761del (p.Arg913_Glu920del). Functional tests suggest that each disease genotype might retain some ARHGEF18 activity, such that the phenotype described here is not the consequence of nullizygosity. In particular, the p.Thr270Ala missense variant affects a highly conserved residue in the DBL homology domain, which is required for the interaction and activation of RHOA. Previously, knock-out of Arhgef18 in the medaka fish has been shown to cause larval lethality which is preceded by retinal defects that resemble those seen in zebrafish Crumbs complex knock-outs. The findings described here emphasize the peculiar sensitivity of the retina to perturbations of this pathway, which is highlighted as a target for potential therapeutic strategies.
Published: 2017
Full Text: View/download PDF

19. Comprehensive Rare Variant Analysis via Whole-Genome Sequencing to Determine the Molecular Pathology of Inherited Retinal Disease

Author: Keren J. Carss, Gavin Arno, Marie Erwood, Jonathan Stephens, Alba Sanchis-Juan, Sarah Hull, Karyn Megy, Detelina Grozeva, Eleanor Dewhurst, Samantha Malka, Vincent Plagnol, Christopher Penkett, Kathleen Stirrups, Roberta Rizzo, Genevieve Wright, Dragana Josifova, Maria Bitner-Glindzicz, Richard H. Scott, Emma Clement, Louise Allen, Ruth Armstrong, Angela F. Brady, Jenny Carmichael, Manali Chitre, Robert H.H. Henderson, Jane Hurst, Robert E. MacLaren, Elaine Murphy, Joan Paterson, Elisabeth Rosser, Dorothy A. Thompson, Emma Wakeling, Willem H. Ouwehand, Michel Michaelides, Anthony T. Moore, Andrew R. Webster, F. Lucy Raymond, Timothy Aitman, Hana Alachkar, Sonia Ali, David Allsup, Gautum Ambegaonkar, Julie Anderson, Richard Antrobus, Gururaj Arumugakani, Sofie Ashford, William Astle, Antony Attwood, Steve Austin, Chiara Bacchelli, Tamam Bakchoul, Tadbir K. Bariana, Helen Baxendale, David Bennett, Claire Bethune, Shahnaz Bibi, Marta Bleda, Harm Boggard, Paula Bolton-Maggs, Claire Booth, John R. Bradley, Angie Brady, Matthew Brown, Michael Browning, Christine Bryson, Siobhan Burns, Paul Calleja, Natalie Canham, Keren Carss, Mark Caulfield, Elizabeth Chalmers, Anita Chandra, Patrick Chinnery, Colin Church, Naomi Clements-Brod, Virginia Clowes, Gerry Coghlan, Peter Collins, Nichola Cooper, Amanda Creaser-Myers, Rosa DaCosta, Louise Daugherty, Sophie Davies, John Davis, Minka De Vries, Patrick Deegan, Sri V.V. Deevi, Charu Deshpande, Lisa Devlin, Rainer Doffinger, Natalie Dormand, Elizabeth Drewe, David Edgar, William Egner, Wendy N. Erber, Tamara Everington, Remi Favier, Helen Firth, Debra Fletcher, Frances Flinter, James C. Fox, Amy Frary, Kathleen Freson, Bruce Furie, Abigail Furnell, Daniel Gale, Alice Gardham, Michael Gattens, Neeti Ghali, Pavandeep K. Ghataorhe, Rohit Ghurye, Simon Gibbs, Kimberley Gilmour, Paul Gissen, Sarah Goddard, Keith Gomez, Pavel Gordins, Stefan Gräf, Daniel Greene, Alan Greenhalgh, Andreas Greinacher, Sofia Grigoriadou, Scott Hackett, Charaka Hadinnapola, Rosie Hague, Matthias Haimel, Csaba Halmagyi, Tracey Hammerton, Daniel Hart, Grant Hayman, Johan W.M. Heemskerk, Robert Henderson, Anke Hensiek, Yvonne Henskens, Archana Herwadkar, Simon Holden, Muriel Holder, Susan Holder, Fengyuan Hu, Aarnoud Huissoon, Marc Humbert, Roger James, Stephen Jolles, Rashid Kazmi, David Keeling, Peter Kelleher, Anne M. Kelly, Fiona Kennedy, David Kiely, Nathalie Kingston, Ania Koziell, Deepa Krishnakumar, Taco W. Kuijpers, Dinakantha Kumararatne, Manju Kurian, Michael A. Laffan, Michele P. Lambert, Hana Lango Allen, Allan Lawrie, Sara Lear, Melissa Lees, Claire Lentaigne, Ri Liesner, Rachel Linger, Hilary Longhurst, Lorena Lorenzo, Rajiv Machado, Rob Mackenzie, Robert MacLaren, Eamonn Maher, Jesmeen Maimaris, Sarah Mangles, Ania Manson, Rutendo Mapeta, Hugh S. Markus, Jennifer Martin, Larahmie Masati, Mary Mathias, Vera Matser, Anna Maw, Elizabeth McDermott, Coleen McJannet, Stuart Meacham, Sharon Meehan, Sarju Mehta, Carolyn M. Millar, Shahin Moledina, Anthony Moore, Nicholas Morrell, Andrew Mumford, Sai Murng, Sergey Nejentsev, Sadia Noorani, Paquita Nurden, Eric Oksenhendler, Sofia Papadia, Soo-Mi Park, Alasdair Parker, John Pasi, Chris Patch, Jeanette Payne, Andrew Peacock, Kathelijne Peerlinck, Christopher J. Penkett, Joanna Pepke-Zaba, David J. Perry, Val Pollock, Gary Polwarth, Mark Ponsford, Waseem Qasim, Isabella Quinti, Stuart Rankin, Julia Rankin, Karola Rehnstrom, Evan Reid, Christopher J. Rhodes, Michael Richards, Sylvia Richardson, Alex Richter, Irene Roberts, Matthew Rondina, Catherine Roughley, Kevin Rue-Albrecht, Crina Samarghitean, Richard Sandford, Saikat Santra, Ravishankar Sargur, Sinisa Savic, Sol Schulman, Harald Schulze, Richard Scott, Marie Scully, Suranjith Seneviratne, Carrock Sewell, Olga Shamardina, Debbie Shipley, Ilenia Simeoni, Suthesh Sivapalaratnam, Kenneth Smith, Aman Sohal, Laura Southgate, Simon Staines, Emily Staples, Hans Stauss, Penelope Stein, Sophie Stock, Jay Suntharalingam, R. Campbell Tait, Kate Talks, Yvonne Tan, Jecko Thachil, James Thaventhiran, Ellen Thomas, Moira Thomas, Dorothy Thompson, Adrian Thrasher, Marc Tischkowitz, Catherine Titterton, Cheng-Hock Toh, Mark Toshner, Carmen Treacy, Richard Trembath, Salih Tuna, Wojciech Turek, Ernest Turro, Chris Van Geet, Marijke Veltman, Julie Vogt, Julie von Ziegenweldt, Anton Vonk Noordegraaf, Ivy Wanjiku, Timothy Q. Warner, Evangeline Wassmer, Hugh Watkins, Andrew Webster, Steve Welch, Sarah Westbury, John Wharton, Deborah Whitehorn, Martin Wilkins, Lisa Willcocks, Catherine Williamson, Geoffrey Woods, John Wort, Nigel Yeatman, Patrick Yong, Tim Young, Ping Yu, Pediatric surgery, Molecular cell biology and Immunology, Pulmonary medicine, ACS - Pulmonary hypertension & thrombosis, APH - Quality of Care, Amsterdam Reproduction & Development (AR&D), Rue-Albrecht, K, RS: CARIM - R1.04 - Clinical thrombosis and haemostasis, MUMC+: DA CDL Algemeen (9), Med Microbiol, Infect Dis & Infect Prev, RS: CARIM - R1.03 - Cell biochemistry of thrombosis and haemostasis, Biochemie, Raymond, Lucy [0000-0003-2652-3355], Apollo - University of Cambridge Repository, Vascular Medicine, and Paediatric Infectious Diseases / Rheumatology / Immunology
Subjects: 0301 basic medicine, Male, DNA Mutational Analysis, EXOME, PROTEIN, Eye, whole-genome sequence, NIHR-BioResource Rare Diseases Consortium, Medical and Health Sciences, Choroideremia, ACTIVATION, 0302 clinical medicine, Ethnicity, 2.1 Biological and endogenous factors, Exome, rare sequence variant, Copy-number variation, Aetiology, MUTATION, Genetics (clinical), Exome sequencing, Genetics & Heredity, Genetics, Genome, Adaptor Proteins, Biological Sciences, DYSTROPHY, copy-number variants, Female, Human, Common disease-common variant, LEBER CONGENITAL AMAUROSIS, Ethnic Groups, Genes, Recessive, Biology, DIAGNOSIS, Article, 03 medical and health sciences, Rare Diseases, Retinal Diseases, STARGARDT DISEASE, Clinical Research, REVEALS, Journal Article, medicine, Recessive, Humans, retinal dystrophy, Eye Disease and Disorders of Vision, Alleles, Adaptor Proteins, Signal Transducing, Whole genome sequencing, Base Sequence, Genome, Human, Human Genome, Signal Transducing, Neurosciences, Genetic Variation, medicine.disease, GENE, Introns, Stargardt disease, Good Health and Well Being, 030104 developmental biology, Genes, Mutation, 030221 ophthalmology & optometry, Human genome
Abstract: Inherited retinal disease is a common cause of visual impairment and represents a highly heterogeneous group of conditions. Here, we present findings from a cohort of 722 individuals with inherited retinal disease, who have had whole-genome sequencing (n = 605), whole-exome sequencing (n = 72), or both (n = 45) performed, as part of the NIHR-BioResource Rare Diseases research study. We identified pathogenic variants (single-nucleotide variants, indels, or structural variants) for 404/722 (56%) individuals. Whole-genome sequencing gives unprecedented power to detect three categories of pathogenic variants in particular: structural variants, variants in GC-rich regions, which have significantly improved coverage compared to whole-exome sequencing, and variants in non-coding regulatory regions. In addition to previously reported pathogenic regulatory variants, we have identified a previously unreported pathogenic intronic variant in $\textit{CHM}$ in two males with choroideremia. We have also identified 19 genes not previously known to be associated with inherited retinal disease, which harbor biallelic predicted protein-truncating variants in unsolved cases. Whole-genome sequencing is an increasingly important comprehensive method with which to investigate the genetic causes of inherited retinal disease.
Published: 2017
Full Text: View/download PDF

20. Homocysteine and small vessel stroke: A mendelian randomization analysis

Author: Matthew Traylor, Susanna C. Larsson, Hugh S. Markus, Larsson, Susanna C [0000-0003-0118-0341], Traylor, Matthew [0000-0001-6624-8621], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, medicine.medical_specialty, Neurologi, Homocysteine, Single-nucleotide polymorphism, Gastroenterology, Polymorphism, Single Nucleotide, Brain Ischemia, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Internal medicine, Mendelian randomization, medicine, Humans, Vitamin B12, Stroke, Research Articles, biology, business.industry, Odds ratio, Mendelian Randomization Analysis, medicine.disease, 3. Good health, B vitamins, Vitamin B 12, 030104 developmental biology, Neurology, chemistry, Methylenetetrahydrofolate reductase, Microvessels, biology.protein, Neurology (clinical), business, 030217 neurology & neurosurgery, Research Article
Abstract: Objective Trials of B vitamin therapy to lower blood total homocysteine (tHcy) levels for prevention of stroke are inconclusive. Secondary analyses of trial data and epidemiological studies suggest that tHcy levels may be particularly associated with small vessel stroke (SVS). We assessed whether circulating tHcy and B vitamin levels are selectively associated with SVS, but not other stroke subtypes, using Mendelian randomization. Methods We used summary statistics data for single-nucleotide polymorphisms (SNPs) associated with tHcy (n = 18), folate (n = 3), vitamin B-6 (n = 1), and vitamin B-12 (n = 14) levels, and the corresponding data for stroke from the MEGASTROKE consortium (n = 16,952 subtyped ischemic stroke cases and 404,630 noncases). Results Genetically predicted tHcy was associated with SVS, with an odds ratio of 1.34 (95% confidence interval [CI], 1.13-1.58; p = 6.7 x 10(-4)) per 1 standard deviation (SD) increase in genetically predicted tHcy levels, but was not associated with large artery or cardioembolic stroke. The association was mainly driven by SNPs at or near the MTHFR and MUT genes. The odds ratios of SVS per 1 SD increase in genetically predicted folate and vitamin B-6 levels were 0.49 (95% CI, 0.34-0.71; p = 1.3 x 10(-4)) and 0.70 (95% CI, 0.52-0.94; p = 0.02), respectively. Genetically higher vitamin B-12 levels were not associated with any stroke subtype. Interpretation These findings suggest that any effect of homocysteine-lowering treatment in preventing stroke will be confined to the SVS subtype. Whether genetic variants at or near the MTHFR and MUT genes influence SVS risk through pathways other than homocysteine levels and downstream effects require further investigation. Ann Neurol 2019;85:495-501
Published: 2019

21. Inflammation and cerebral small vessel disease: A systematic review

Author: John T. O'Brien, Hugh S. Markus, Elijah Mak, James B. Rowe, and Audrey Low
Subjects: 0301 basic medicine, Adult, Male, Aging, Pathology, medicine.medical_specialty, Endothelium, Inflammation, Systemic inflammation, Biochemistry, 03 medical and health sciences, 0302 clinical medicine, Centrum semiovale, medicine, Dementia, Animals, Humans, Cognitive Dysfunction, Endothelial dysfunction, Molecular Biology, Stroke, Aged, Aged, 80 and over, business.industry, Brain, Middle Aged, medicine.disease, Hyperintensity, 3. Good health, 030104 developmental biology, medicine.anatomical_structure, Neurology, Blood-Brain Barrier, Cerebral Small Vessel Diseases, Hypertension, Female, medicine.symptom, business, 030217 neurology & neurosurgery, Biotechnology
Abstract: Inflammation is increasingly implicated as a risk factor for dementia, stroke, and small vessel disease (SVD). However, the underlying mechanisms and causative pathways remain unclear. We systematically reviewed the existing literature on the associations between markers of inflammation and SVD (i.e., white matter hyperintensities (WMH), lacunes, enlarged perivascular spaces (EPVS), cerebral microbleeds (CMB)) in cohorts of older people with good health, cerebrovascular disease, or cognitive impairment. Based on distinctions made in the literature, markers of inflammation were classified as systemic inflammation (e.g. C-reactive protein, interleukin-6, fibrinogen) or vascular inflammation/endothelial dysfunction (e.g. homocysteine, von Willebrand factor, Lp-PLA2). Evidence from 82 articles revealed relatively robust associations between SVD and markers of vascular inflammation, especially amongst stroke patients, suggesting that alterations to the endothelium and blood-brain barrier may be a driving force behind SVD. Conversely, cross-sectional findings on systemic inflammation were mixed, although longitudinal investigations demonstrated that elevated levels of systemic inflammatory markers at baseline predicted subsequent SVD severity and progression. Importantly, regional analysis revealed that systemic and vascular inflammation were differentially related to two distinct forms of SVD. Specifically, markers of vascular inflammation tended to be associated with SVD in areas typical of hypertensive arteriopathy (e.g., basal ganglia), while systemic inflammation appeared to be involved in CAA-related vascular damage (e.g., centrum semiovale). Nonetheless, there is insufficient data to establish whether inflammation is causal of, or secondary to, SVD. Findings have important implications on interventions, suggesting the potential utility of treatments targeting the brain endothelium and blood brain barrier to combat SVD and associated neurodegenerative diseases.
Published: 2019

22. How common are single gene mutations as a cause for lacunar stroke? A targeted gene panel study

Author: Hugh S. Markus, Daniel Duarte, Olga Shamardina, Sri V V Deevi, Karyn Megy, Willem H. Ouwehand, Rutendo Mapeta, Rhea Y. Y. Tan, Kate Downes, Matthew Traylor, and Stefan Gräf
Subjects: 0301 basic medicine, Male, Lacunar stroke, Population, Migraine with Aura, CADASIL, DNA sequencing, Article, 03 medical and health sciences, 0302 clinical medicine, medicine, Missense mutation, Humans, Age of Onset, education, Connective Tissue Diseases, Genotyping, Aged, Genetics, Whole genome sequencing, education.field_of_study, business.industry, High-Throughput Nucleotide Sequencing, Middle Aged, medicine.disease, 3. Good health, 030104 developmental biology, Cerebral Small Vessel Diseases, Mutation, Stroke, Lacunar, Female, Neurology (clinical), Age of onset, business, 030217 neurology & neurosurgery, Cerebral Amyloid Angiopathy, Familial
Abstract: ObjectivesTo determine the frequency of rare and pertinent disease-causing variants in small vessel disease (SVD)-associated genes (such as NOTCH3, HTRA1, COL4A1, COL4A2, FOXC1, TREX1, and GLA) in cerebral SVD, we performed targeted gene sequencing in 950 patients with younger-onset apparently sporadic SVD stroke using a targeted sequencing panel.MethodsWe designed a high-throughput sequencing panel to identify variants in 15 genes (7 known SVD genes, 8 SVD-related disorder genes). The panel was used to screen a population of 950 patients with younger-onset (≤70 years) MRI-confirmed SVD stroke, recruited from stroke centers across the United Kingdom. Variants were filtered according to their frequency in control databases, predicted effect, presence in curated variant lists, and combined annotation dependent depletion scores. Whole genome sequencing and genotyping were performed on a subset of patients to provide a direct comparison of techniques. The frequency of known disease-causing and pertinent variants of uncertain significance was calculated.ResultsWe identified previously reported variants in 14 patients (8 cysteine-changing NOTCH3 variants in 11 patients, 2 HTRA1 variants in 2 patients, and 1 missense COL4A1 variant in 1 patient). In addition, we identified 29 variants of uncertain significance in 32 patients.ConclusionRare monogenic variants account for about 1.5% of younger onset lacunar stroke. Most are cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy variants, but the second most common gene affected is HTRA1. A high-throughput sequencing technology platform is an efficient, reliable method to screen for such mutations.
Published: 2019

23. Subtype Specificity of Genetic Loci Associated With Stroke in 16 664 Cases and 32 792 Controls

Author: Carl D. Langefeld, Christopher D. Anderson, Braxton D. Mitchell, Jordi Jimenez-Conde, Reinhold Schmidt, John W. Cole, Jonathan Rosand, Mary E. Comeau, Loes Rutten-Jacobs, Cathie Sudlow, Ralph L. Sacco, Raji P. Grewal, Hakan Ay, Matthew Traylor, Marta Ribasés, Tatjana Rundek, Daniel Woo, Hugh S. Markus, Rainer Malik, Kathryn M. Rexrode, Guido J. Falcone, Huichun Xu, Jin Moo Lee, Martin Dichgans, Steven J. Kittner, Traylor, Matthew [0000-0001-6624-8621], Jacobs, Loes [0000-0003-3223-885X], Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Male, Genotype, Biology, Chromosome, Cerebral hemorrhage, Article, 03 medical and health sciences, 0302 clinical medicine, medicine, Haplotype, Dementia, Humans, ddc:610, cardiovascular diseases, Stroke, Genetic association, Aged, Genetics, Aged, 80 and over, Bayes Theorem, General Medicine, Middle Aged, medicine.disease, Atherosclerosis, 3. Good health, Europe, 030104 developmental biology, Genetic Loci, Case-Control Studies, genetics [Stroke], Female, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: Background: Genome-wide association studies have identified multiple loci associated with stroke. However, the specific stroke subtypes affected, and whether loci influence both ischemic and hemorrhagic stroke, remains unknown. For loci associated with stroke, we aimed to infer the combination of stroke subtypes likely to be affected, and in doing so assess the extent to which such loci have homogeneous effects across stroke subtypes. Methods: We performed Bayesian multinomial regression in 16 664 stroke cases and 32 792 controls of European ancestry to determine the most likely combination of stroke subtypes affected for loci with published genome-wide stroke associations, using model selection. Cases were subtyped under 2 commonly used stroke classification systems, TOAST (Trial of Org 10172 Acute Stroke Treatment) and causative classification of stroke. All individuals had genotypes imputed to the Haplotype Reference Consortium 1.1 Panel. Results: Sixteen loci were considered for analysis. Seven loci influenced both hemorrhagic and ischemic stroke, 3 of which influenced ischemic and hemorrhagic subtypes under both TOAST and causative classification of stroke. Under causative classification of stroke, 4 loci influenced both small vessel stroke and intracerebral hemorrhage. An EDNRA locus demonstrated opposing effects on ischemic and hemorrhagic stroke. No loci were predicted to influence all stroke subtypes in the same direction, and only one locus (12q24) was predicted to influence all ischemic stroke subtypes. Conclusions: Heterogeneity in the influence of stroke-associated loci on stroke subtypes is pervasive, reflecting differing causal pathways. However, overlap exists between hemorrhagic and ischemic stroke, which may reflect shared pathobiology predisposing to small vessel arteriopathy. Stroke is a complex, heterogeneous disorder requiring tailored analytic strategies to decipher genetic mechanisms.
Published: 2019
Full Text: View/download PDF

24. Vascular dysfunction-The disregarded partner of Alzheimer's disease

Author: Zoe Arvanitakis, Helena C. Chui, Rhian M. Touyz, Orly Lazarov, Christopher Chen, Fergus N. Doubal, Danny J.J. Wang, Lon S. Schneider, Hector M. González, Chun Yuan, Hugh S. Markus, Martin Dichgans, Gustavo C. Román, Lester R. Drewes, Anders Wallin, Deborah Gustafson, Meng Law, Rajesh N. Kalaria, Julie A. Schneider, Philip M.W. Bath, Adrian Wong, Caleb E. Finch, Axel Montagne, Sudha Seshadri, Peter Passmore, Helene Benveniste, Arthur W. Toga, Edith Hamel, Terence J. Quinn, Mark A. van Buchem, Vladimir Hachinski, David J. Werring, Sarah E. Lutz, Rebecca F. Gottesman, Berislav V. Zlokovic, Costantino Iadecola, Judy Pa, Sandra E. Black, Joel Ramirez, Ingmar Skoog, Roxana O. Carare, Majon Muller, Zvonimir S. Katusic, Perminder S. Sachdev, Steve C.R. Williams, Daniel A. Nation, Frederick Barkof, Michael A. Moskowitz, Timothy M. Hughes, Rustam Al-Shahi Salman, Joanna M. Wardlaw, Richard D. Minshall, Eric E. Smith, Jalees Rehman, Seth Love, Vincent Mok, Russell E. Jacobs, Melanie D. Sweeney, Michael G. Harrington, Cheryl L. Wellington, John T. O'Brien, Geert Jan Biessels, Monique M.B. Breteler, Stuart M. Allan, Leonardo Pantoni, Thomas P. Davis, Samuel N. Lockhart, Abhay P. Sagare, VU University medical center, APH - Aging & Later Life, ACS - Atherosclerosis & ischemic syndromes, and Internal medicine
Subjects: 0301 basic medicine, Aging, White Matter/pathology, Epidemiology, Disease, Neurodegenerative, National Institute on Aging, pathology [Alzheimer Disease], 0302 clinical medicine, pathology [Brain], pathology [White Matter], Alzheimer Disease/pathology, Vascular Cognitive Impairment/Dementia, National Institute on Aging (U.S.), 2.1 Biological and endogenous factors, Aetiology, Blood-brain barrier, Health Policy, Brain, Alzheimer's disease, Cerebral blood flow, White Matter, Pathophysiology, Psychiatry and Mental health, medicine.anatomical_structure, Cerebrovascular Circulation, Neurological, Biomarker (medicine), metabolism [Blood-Brain Barrier], Blood-Brain Barrier/metabolism, MRI, Amyloid, Cerebrovascular Circulation/physiology, Clinical Sciences, metabolism [Amyloid beta-Peptides], Blood–brain barrier, physiopathology [Alzheimer Disease], physiology [Cerebrovascular Circulation], Article, White matter, physiopathology [Vascular Diseases], 03 medical and health sciences, Cellular and Molecular Neuroscience, Developmental Neuroscience, Alzheimer Disease, Vascular, Acquired Cognitive Impairment, medicine, Journal Article, Humans, Dementia, Brain/pathology, Vascular Diseases, ddc:610, Amyloid beta-Peptides/metabolism, Amyloid beta-Peptides, business.industry, Vascular Diseases/physiopathology, Neurosciences, Alzheimer's Disease including Alzheimer's Disease Related Dementias (AD/ADRD), medicine.disease, United States, Brain Disorders, 030104 developmental biology, Geriatrics, Neurology (clinical), Geriatrics and Gerontology, business, Neuroscience, 030217 neurology & neurosurgery, Biomarkers
Abstract: Increasing evidence recognizes Alzheimer's disease (AD) as a multifactorial and heterogeneous disease with multiple contributors to its pathophysiology, including vascular dysfunction. The recently updated AD Research Framework put forth by the National Institute on Aging-Alzheimer's Association describes a biomarker-based pathologic definition of AD focused on amyloid, tau, and neuronal injury. In response to this article, here we first discussed evidence that vascular dysfunction is an important early event in AD pathophysiology. Next, we examined various imaging sequences that could be easily implemented to evaluate different types of vascular dysfunction associated with, and/or contributing to, AD pathophysiology, including changes in blood-brain barrier integrity and cerebral blood flow. Vascular imaging biomarkers of small vessel disease of the brain, which is responsible for >50% of dementia worldwide, including AD, are already established, well characterized, and easy to recognize. We suggest that these vascular biomarkers should be incorporated into the AD Research Framework to gain a better understanding of AD pathophysiology and aid in treatment efforts. (C) 2018 the Alzheimer's Association. Published by Elsevier Inc. All rights reserved.
Published: 2019
Full Text: View/download PDF

25. Disruption of rich club organisation in cerebral small vessel disease

Author: Hugh S. Markus, David G. Norris, Anil M. Tuladhar, Frank-Erik de Leeuw, Andrew J. Lawrence, and Thomas R. Barrick
Subjects: 0301 basic medicine, Radiological and Ultrasound Technology, Disease, Biology, Executive functions, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, Neurology, Radiology, Nuclear Medicine and imaging, Neurology (clinical), Cognitive Assessment System, Club, Small vessel, Anatomy, Cognitive impairment, Neuroscience, 030217 neurology & neurosurgery, Tractography, Diffusion MRI
Abstract: Cerebral small vessel disease (SVD) is an important cause of vascular cognitive impairment. Recent studies have demonstrated that structural connectivity of brain networks in SVD is disrupted. However, little is known about the extent and location of the reduced connectivity in SVD. Here they investigate the rich club organisation-a set of highly connected and interconnected regions-and investigate whether there is preferential rich club disruption in SVD. Diffusion tensor imaging (DTI) and cognitive assessment were performed in a discovery sample of SVD patients (n = 115) and healthy control subjects (n = 50). Results were replicated in an independent dataset (49 SVD with confluent WMH cases and 108 SVD controls) with SVD patients having a similar SVD phenotype to that of the discovery cases. Rich club organisation was examined in structural networks derived from DTI followed by deterministic tractography. Structural networks in SVD patients were less dense with lower network strength and efficiency. Reduced connectivity was found in SVD, which was preferentially located in the connectivity between the rich club nodes rather than in the feeder and peripheral connections, a finding confirmed in both datasets. In discovery dataset, lower rich club connectivity was associated with lower scores on psychomotor speed (beta = 0.29, P < 0.001) and executive functions (beta = 0.20, P = 0.009). These results suggest that SVD is characterized by abnormal connectivity between rich club hubs in SVD and provide evidence that abnormal rich club organisation might contribute to the development of cognitive impairment in SVD. Hum Brain Mapp 38:1751-1766, 2017. (c) 2017 Wiley Periodicals, Inc.
Published: 2016
Full Text: View/download PDF

26. Identification of additional risk loci for stroke and small vessel disease

Author: Matthew Traylor, Vilmundur Gudnason, Kerri L. Wiggins, Christophe Tzourio, Reinhold E. Schmidt, Hugo J. Aparicio, Tamara B. Harris, Audrey Y. Chu, Oscar R. Benavente, Anton J. M. de Craen, Nancy L. Pedersen, Lars Lannfelt, Didier Leys, Erkki Vartiainen, Myriam Fornage, Marileen L.P. Portegies, Nicholas L. Smith, Daniel Woo, Martin Dichgans, John W. Cole, Christina Jern, Christopher R Levi, Kenneth Rice, André G. Uitterlinden, Rebecca F. Gottesman, M. Arfan Ikram, Ralph L. Sacco, Cornelia M. van Duijn, Samuli Ripatti, Anita L. DeStefano, Donna K. Arnett, Curtis R. French, Tobias Kurth, Tomi Pastinen, Raji P. Grewal, Susan R. Heckbert, Jordi Jimenez-Conde, Jemma C. Hopewell, Cecilia M. Lindgren, Azadeh Reyahi, Michèle M. Sale, Marcello Ricardo Paulista Markus, Albert Hofman, Seung Hoan Choi, Peter J. Koudstaal, Veikko Salomaa, Robert Clarke, Arne Lindgren, B. Gwen Windham, Farid Radmanesh, Peter M. Rothwell, Carsten Oliver Schmidt, Xueqiu Jian, David S. Knopman, Yongmei Liu, Joan Montaner, Jean-François Dartigues, Paul M. Ridker, Julie A. Johnson, Stefan Gustafsson, Jerome I. Rotter, Manja Kloss, Tatjana Rundek, David J. Stott, Ganesh Chauhan, Ordan J. Lehmann, Ali Moussavi Nik, Marcel den Hoed, Alessandro Pezzini, Jin-Moo Lee, Hans J. Grabe, Sylvia Wassertheil-Smoller, Anders Hamsten, Thomas H. Mosley, Muralidharan Sargurupremraj, Lenore J. Launer, Kathryn M. Rexrode, Quenna Wong, Jonathan Rosand, David A. Bennett, Philip L. De Jager, James F. Meschia, Alexa S. Beiser, J. Wouter Jukema, Traci M. Bartz, Mike A. Nalls, Cathie Sudlow, Erik Ingelsson, Yoichiro Kamatani, Ulf Schminke, Joris Deelen, Stéphanie Debette, Andrew P. Morris, Aki S. Havulinna, Sudha Seshadri, Bradford B. Worrall, Stephen S. Rich, Lars Lindgren, Hieab H.H. Adams, Ani Manichaikul, Jean-Sébastien Vidal, Bruce M. Psaty, Julie E. Buring, Jean Dallongeville, Oscar L. Lopez, Corey R. Arnold, Olle Melander, Olafur Kjartansson, Alexander Teumer, Sarah J. Childs, William T. Longstreth, Charles C. White, Stefan T. Engelter, Daniel I. Chasman, Norrina B. Allen, Rainer Malik, Vincent Thijs, Stella Trompet, Joshua C. Bis, Ian Ford, Peter Carlsson, Céline Bellenguez, Sara L. Pulit, Pankaj Sharma, Patrik K. E. Magnusson, Flora Xue, Giorgio B. Boncoraglio, Mark Lathrop, Melissa E. Garcia, Andrew D. Johnson, Steve Bevan, Albert V. Smith, Claudia L. Satizabal, Agnieszka Slowik, Michael Griswold, Claudine Berr, and Hugh S. Markus
Subjects: Adult, Male, 0301 basic medicine, Adolescent, Population, Genome-wide association study, Biology, Bioinformatics, Article, Brain ischemia, Mice, Young Adult, 03 medical and health sciences, 0302 clinical medicine, SDG 3 - Good Health and Well-being, medicine, Animals, Humans, Child, education, Allele frequency, Stroke, Aged, Aged, 80 and over, education.field_of_study, Cerebral infarction, Forkhead Transcription Factors, Odds ratio, Middle Aged, 16. Peace & justice, medicine.disease, R1, 3. Good health, Minor allele frequency, 030104 developmental biology, Genetic Loci, Cerebral Small Vessel Diseases, Child, Preschool, Female, Neurology (clinical), 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: Background Genetic determinants of stroke, the leading neurological cause of death and disability, are poorly understood and have seldom been explored in the general population. Our aim was to identify additional loci for stroke by doing a meta-analysis of genome-wide association studies. Methods For the discovery sample, we did a genome-wide analysis of common genetic variants associated with incident stroke risk in 18 population-based cohorts comprising 84â€ˆ961 participants, of whom 4348 had stroke. Stroke diagnosis was ascertained and validated by the study investigators. Mean age at stroke ranged from 45Â·8 years to 76Â·4 years, and data collection in the studies took place between 1948 and 2013. We did validation analyses for variants yielding a significant association (at pâˆ’6) with all-stroke, ischaemic stroke, cardioembolic ischaemic stroke, or non-cardioembolic ischaemic stroke in the largest available cross-sectional studies (70â€ˆ804 participants, of whom 19â€ˆ816 had stroke). Summary-level results of discovery and follow-up stages were combined using inverse-variance weighted fixed-effects meta-analysis, and in-silico lookups were done in stroke subtypes. For genome-wide significant findings (at pâˆ’8), we explored associations with additional cerebrovascular phenotypes and did functional experiments using conditional (inducible) deletion of the probable causal gene in mice. We also studied the expression of orthologs of this probable causal gene and its effects on cerebral vasculature in zebrafish mutants. Findings We replicated seven of eight known loci associated with risk for ischaemic stroke, and identified a novel locus at chromosome 6p25 (rs12204590, near FOXF2) associated with risk of all-stroke (odds ratio [OR] 1Â·08, 95% CI 1Â·05â€“1Â·12, p=1Â·48â€ˆÃ—â€ˆ10âˆ’8; minor allele frequency 21%). The rs12204590 stroke risk allele was also associated with increased MRI-defined burden of white matter hyperintensityâ€”a marker of cerebral small vessel diseaseâ€”in stroke-free adults (n=21â€ˆ079; p=0Â·0025). Consistently, young patients (aged 2â€“32 years) with segmental deletions of FOXF2 showed an extensive burden of white matter hyperintensity. Deletion of Foxf2 in adult mice resulted in cerebral infarction, reactive gliosis, and microhaemorrhage. The orthologs of FOXF2 in zebrafish (foxf2b and foxf2a) are expressed in brain pericytes and mutant foxf2bâˆ’/âˆ’ cerebral vessels show decreased smooth muscle cell and pericyte coverage. Interpretation We identified common variants near FOXF2 that are associated with increased stroke susceptibility. Epidemiological and experimental data suggest that FOXF2 mediates this association, potentially via differentiation defects of cerebral vascular mural cells. Further expression studies in appropriate human tissues, and further functional experiments with long follow-up periods are needed to fully understand the underlying mechanisms. Funding NIH, NINDS, NHMRC, CIHR, European national research institutions, Fondation Leducq.
Published: 2016
Full Text: View/download PDF

27. A Method to Exploit the Structure of Genetic Ancestry Space to Enhance Case-Control Studies

Author: Corneliu A. Bodea, Benjamin M. Neale, Stephan Ripke, Mark J. Daly, Bernie Devlin, Kathryn Roeder, Murray Barclay, Laurent Peyrin-Biroulet, Mathias Chamaillard, Jean-Frederick Colombel, Mario Cottone, Anthony Croft, Renata D’Incà, Jonas Halfvarson, Katherine Hanigan, Paul Henderson, Jean-Pierre Hugot, Amir Karban, Nicholas A. Kennedy, Mohammed Azam Khan, Marc Lémann, Arie Levine, Dunecan Massey, Monica Milla, Grant W. Montgomery, Sok Meng Evelyn Ng, Ioannis Oikonomou, Harald Peeters, Deborah D. Proctor, Jean-Francois Rahier, Rebecca Roberts, Paul Rutgeerts, Frank Seibold, Laura Stronati, Kirstin M. Taylor, Leif Törkvist, Kullak Ublick, Johan Van Limbergen, Andre Van Gossum, Morten H. Vatn, Hu Zhang, Wei Zhang, Jane M. Andrews, Peter A. Bampton, Timothy H. Florin, Richard Gearry, Krupa Krishnaprasad, Ian C. Lawrance, Gillian Mahy, Graham Radford-Smith, Rebecca L. Roberts, Lisa A. Simms, Leila Amininijad, Isabelle Cleynen, Olivier Dewit, Denis Franchimont, Michel Georges, Debby Laukens, Emilie Theatre, André Van Gossum, Severine Vermeire, Guy Aumais, Leonard Baidoo, Arthur M. Barrie, Karen Beck, Edmond-Jean Bernard, David G. Binion, Alain Bitton, Steve R. Brant, Judy H. Cho, Albert Cohen, Kenneth Croitoru, Lisa W. Datta, Colette Deslandres, Richard H. Duerr, Debra Dutridge, John Ferguson, Joann Fultz, Philippe Goyette, Gordon R. Greenberg, Talin Haritunians, Gilles Jobin, Seymour Katz, Raymond G. Lahaie, Dermot P. McGovern, Linda Nelson, Sok Meng Ng, Kaida Ning, Pierre Paré, Miguel D. Regueiro, John D. Rioux, Elizabeth Ruggiero, L. Philip Schumm, Marc Schwartz, Regan Scott, Yashoda Sharma, Mark S. Silverberg, Denise Spears, A. Hillary Steinhart, Joanne M. Stempak, Jason M. Swoger, Constantina Tsagarelis, Clarence Zhang, Hongyu Zhao, Jan Aerts, Tariq Ahmad, Hazel Arbury, Anthony Attwood, Adam Auton, Stephen G. Ball, Anthony J. Balmforth, Chris Barnes, Jeffrey C. Barrett, Inês Barroso, Anne Barton, Amanda J. Bennett, Sanjeev Bhaskar, Katarzyna Blaszczyk, John Bowes, Oliver J. Brand, Peter S. Braund, Francesca Bredin, Gerome Breen, Morris J. Brown, Ian N. Bruce, Jaswinder Bull, Oliver S. Burren, John Burton, Jake Byrnes, Sian Caesar, Niall Cardin, Chris M. Clee, Alison J. Coffey, John M.C. Connell, Donald F. Conrad, Jason D. Cooper, Anna F. Dominiczak, Kate Downes, Hazel E. Drummond, Darshna Dudakia, Andrew Dunham, Bernadette Ebbs, Diana Eccles, Sarah Edkins, Cathryn Edwards, Anna Elliot, Paul Emery, David M. Evans, Gareth Evans, Steve Eyre, Anne Farmer, Nicol Ferrier, Edward Flynn, Alistair Forbes, Liz Forty, Jayne A. Franklyn, Timothy M. Frayling, Rachel M. Freathy, Eleni Giannoulatou, Polly Gibbs, Paul Gilbert, Katherine Gordon-Smith, Emma Gray, Elaine Green, Chris J. Groves, Detelina Grozeva, Rhian Gwilliam, Anita Hall, Naomi Hammond, Matt Hardy, Pile Harrison, Neelam Hassanali, Husam Hebaishi, Sarah Hines, Anne Hinks, Graham A. Hitman, Lynne Hocking, Chris Holmes, Eleanor Howard, Philip Howard, Joanna M.M. Howson, Debbie Hughes, Sarah Hunt, John D. Isaacs, Mahim Jain, Derek P. Jewell, Toby Johnson, Jennifer D. Jolley, Ian R. Jones, Lisa A. Jones, George Kirov, Cordelia F. Langford, Hana Lango-Allen, G. Mark Lathrop, James Lee, Kate L. Lee, Charlie Lees, Kevin Lewis, Cecilia M. Lindgren, Meeta Maisuria-Armer, Julian Maller, John Mansfield, Jonathan L. Marchini, Paul Martin, Dunecan C.O. Massey, Wendy L. McArdle, Peter McGuffin, Kirsten E. McLay, Gil McVean, Alex Mentzer, Michael L. Mimmack, Ann E. Morgan, Andrew P. Morris, Craig Mowat, Patricia B. Munroe, Simon Myers, William Newman, Elaine R. Nimmo, Michael C. O’Donovan, Abiodun Onipinla, Nigel R. Ovington, Michael J. Owen, Kimmo Palin, Aarno Palotie, Kirstie Parnell, Richard Pearson, David Pernet, John R.B. Perry, Anne Phillips, Vincent Plagnol, Natalie J. Prescott, Inga Prokopenko, Michael A. Quail, Suzanne Rafelt, Nigel W. Rayner, David M. Reid, Anthony Renwick, Susan M. Ring, Neil Robertson, Samuel Robson, Ellie Russell, David St Clair, Jennifer G. Sambrook, Jeremy D. Sanderson, Stephen J. Sawcer, Helen Schuilenburg, Carol E. Scott, Richard Scott, Sheila Seal, Sue Shaw-Hawkins, Beverley M. Shields, Matthew J. Simmonds, Debbie J. Smyth, Elilan Somaskantharajah, Katarina Spanova, Sophia Steer, Jonathan Stephens, Helen E. Stevens, Kathy Stirrups, Millicent A. Stone, David P. Strachan, Zhan Su, Deborah P.M. Symmons, John R. Thompson, Wendy Thomson, Martin D. Tobin, Mary E. Travers, Clare Turnbull, Damjan Vukcevic, Louise V. Wain, Mark Walker, Neil M. Walker, Chris Wallace, Margaret Warren-Perry, Nicholas A. Watkins, John Webster, Michael N. Weedon, Anthony G. Wilson, Matthew Woodburn, B. Paul Wordsworth, Chris Yau, Allan H. Young, Eleftheria Zeggini, Matthew A. Brown, Paul R. Burton, Mark J. Caulfield, Alastair Compston, Martin Farrall, Stephen C.L. Gough, Alistair S. Hall, Andrew T. Hattersley, Adrian V.S. Hill, Christopher G. Mathew, Marcus Pembrey, Jack Satsangi, Michael R. Stratton, Jane Worthington, Matthew E. Hurles, Audrey Duncanson, Willem H. Ouwehand, Miles Parkes, Nazneen Rahman, John A. Todd, Nilesh J. Samani, Dominic P. Kwiatkowski, Mark I. McCarthy, Nick Craddock, Panos Deloukas, Peter Donnelly, Jenefer M. Blackwell, Elvira Bramon, Juan P. Casas, Aiden Corvin, Janusz Jankowski, Hugh S. Markus, Colin N.A. Palmer, Robert Plomin, Anna Rautanen, Richard C. Trembath, Ananth C. Viswanathan, Nicholas W. Wood, Chris C.A. Spencer, Gavin Band, Céline Bellenguez, Colin Freeman, Garrett Hellenthal, Matti Pirinen, Amy Strange, Hannah Blackburn, Suzannah J. Bumpstead, Serge Dronov, Matthew Gillman, Alagurevathi Jayakumar, Owen T. McCann, Jennifer Liddle, Simon C. Potter, Radhi Ravindrarajah, Michelle Ricketts, Matthew Waller, Paul Weston, Sara Widaa, Pamela Whittaker, UCL - SSS/IREC/GAEN - Pôle d'Hépato-gastro-entérologie, UCL - (MGD) Service de gastro-entérologie, Institute for Molecular Medicine Finland, Aarno Palotie / Principal Investigator, and Genomics of Neurological and Neuropsychiatric Disorders
Subjects: 0301 basic medicine, Heredity, Genetics, Genetics (clinical), Computer science, Genetic Linkage, Genome-wide association study, VARIANTS, 030105 genetics & heredity, computer.software_genre, Bayes' theorem, Gene Frequency, HISTORY, IMPUTATION, False positive paradox, Genetics(clinical), Disease, 0303 health sciences, education.field_of_study, 030305 genetics & heredity, Inheritance (genetic algorithm), Genotype, DATABASE, Genetic genealogy, POWER, Population, Genomics, POPULATION STRATIFICATION, Biology, INHERITANCE, Population stratification, Machine learning, Polymorphism, Single Nucleotide, Article, 03 medical and health sciences, Humans, Genetic Predisposition to Disease, GENOME-WIDE ASSOCIATION, education, Allele frequency, FAMILY-BASED ASSOCIATION, 030304 developmental biology, Genetic association, business.industry, Bayes Theorem, DISEASE ASSOCIATION, Human genetics, Hierarchical clustering, Genetics, Population, 030104 developmental biology, Case-Control Studies, 3111 Biomedicine, Artificial intelligence, business, computer, Software, Imputation (genetics)
Abstract: A. Palotie on työryhmän Int IBD Genetics Consortium jäsen. One goal of human genetics is to understand the genetic basis of disease, a challenge for diseases of complex inheritance because risk alleles are few relative to the vast set of benign variants. Risk variants are often sought by association studies in which allele frequencies in case subjects are contrasted with those from population-based samples used as control subjects. In an ideal world we would know population-level allele frequencies, releasing researchers to focus on case subjects. We argue this ideal is possible, at least theoretically, and we outline a path to achieving it in reality. If such a resource were to exist, it would yield ample savings and would facilitate the effective use of data repositories by removing administrative and technical barriers. We call this concept the Universal Control Repository Network (UNICORN), a means to perform association analyses without necessitating direct access to individual-level control data. Our approach to UNICORN uses existing genetic resources and various statistical tools to analyze these data, including hierarchical clustering with spectral analysis of ancestry; and empirical Bayesian analysis along with Gaussian spatial processes to estimate ancestry-specific allele frequencies. We demonstrate our approach using tens of thousands of control subjects from studies of Crohn disease, showing how it controls false positives, provides power similar to that achieved when all control data are directly accessible, and enhances power when control data are limiting or even imperfectly matched ancestrally. These results highlight how UNICORN can enable reliable, powerful, and convenient genetic association analyses without access to the individual-level data.
Published: 2016
Full Text: View/download PDF

28. GWAS and colocalization analyses implicate carotid intima-media thickness and carotid plaque loci in cardiovascular outcomes

Author: Tina Shah, E. C. M. van Leeuwen, Jingjing Liang, Susan M. Ring, Alexander Teumer, P Anugu, Salman M. Tajuddin, Aaron Isaacs, Jorgen Engmann, Marcus Dörr, Kenneth Rice, Anne B. Newman, Sonia Shah, Lenore J. Launer, Diana Kuh, Panos Roussos, P. De Vries, Bo Hedblad, Xiaofeng Zhu, Walter Palmas, John E. Deanfield, Debbie A Lawlor, Ganesh Chauhan, Dennis O. Mook-Kanamori, André G. Uitterlinden, Sudha Seshadri, Ilja M. Nolte, Elmo Mannarino, Daniel H. O'Leary, Susan R. Heckbert, Bogdan Pasaniuc, Solomon K. Musani, Rebecca Hardy, Rainer Malik, Lesca M. Holdt, Lars Lind, Reinhold Schmidt, R. de Mutsert, Aroon D. Hingorani, Riccardo E. Marioni, P. Amouyel, Albert V. Smith, Janne Pott, Eric E. Schadt, Lyytikäinen L-P., Raymond Noordam, Stéphanie Debette, Oscar H. Franco, Vincent Plagnol, Gerardo Heiss, Brenda W.J.H. Penninx, SG Wannamethee, Carl D. Langefeld, Stella Trompet, C.M. van Duijn, Tessel E. Galesloot, Peter K. Joshi, Maryam Kavousi, Juan P. Casas, Joanna M. Wardlaw, P. Giral, Julian Halcox, Björkegren Jlm., U de Faire, Andries J. Smit, Christina L. Wassel, Christopher J. O'Donnell, Matthew Traylor, Uwe Völker, Mika Kivimäki, Jenna Price, Quenna Wong, Chris Finan, Wayne D. Rosamond, Markus Loeffler, Harry Campbell, L Lu, Jerome I. Rotter, Joop Jukema, Karl Gertow, Edith Hofer, Hugh S. Markus, Albert Hofman, Peter H. Whincup, James G. Wilson, Michelle K. Evans, Enzo Grossi, Matthias Sitzer, Martin Dichgans, Oscar L. Rueda-Ochoa, J. C. Bis, Klodian Dhana, Ralph Burkhardt, Harold Snieder, Kiemeney Lalm., Daniel Teupser, A C Morrison, Markus Scholz, Ulf Schminke, Richard W Morris, Meena Kumari, Caroline Dale, Helena Schmidt, Sara Hägg, Niina Pitkänen, Fabrizio Veglia, Donald W. Bowden, Olli T. Raitakari, Joachim Thiery, Anders Hamsten, Muralidharan Sargurupremraj, Hwang S-J., Elena Tremoli, Stela McLachlan, Amanda J. Cox, Kent D. Taylor, Frank Beutner, Henry Völzke, Terho Lehtimäki, Abbas Dehghan, Ruth C. Lovering, Rachael P. Huntley, Mike A. Nalls, Jemma C. Hopewell, Erik Ingelsson, Claudia Giambartolomei, Bruce M. Psaty, Annie Britton, A Seldenrijk, Bengt Sennblad, Olle Melander, J. de Graaf, Adolfo Correa, Fernando Rivadeneira, Oscar Franzén, Laura M. Raffield, Alan B. Zonderman, Rona J. Strawbridge, Thomas W. Winkler, Ian J. Deary, Misa Graff, Wendy S. Post, Andrew Wong, T.B. Harris, Yasaman Saba, Arno Ruusalepp, James F. Wilson, Vilmundur Gudnason, Eric Boerwinkle, Damiano Baldassarre, Cristiano Fava, S.E. Humphries, Sudhir Kurl, Rainer Rauramaa, Christophe Tzourio, Xuejiang Guo, Nora Franceschini, Xiaoling Zhang, Biochemie, RS: FHML MaCSBio, RS: CARIM - R1.06 - Genetic Epidemiology and Genomics of cardiovascular diseases, RS: CARIM - R1.01 - Blood proteins & engineering, Life Course Epidemiology (LCE), Groningen Kidney Center (GKC), Vascular Ageing Programme (VAP), Faculty of Medicine (UI), Læknadeild (HÍ), Heilbrigðisvísindasvið (HÍ), School of Health Sciences (UI), Háskóli Íslands, University of Iceland, Giambartolomei, Claudia [0000-0003-2786-1225], Huntley, Rachael P [0000-0001-6718-3559], Lovering, Ruth C [0000-0002-9791-0064], Tajuddin, Salman M [0000-0002-7919-8528], Winkler, Thomas W [0000-0003-0292-5421], Nolte, Ilja M [0000-0001-5047-4077], Scholz, Markus [0000-0002-4059-1779], Joshi, Peter K [0000-0002-6361-5059], Isaacs, Aaron [0000-0001-5037-4834], Correa, Adolfo [0000-0002-9501-600X], Teumer, Alexander [0000-0002-8309-094X], Wong, Andrew [0000-0003-2079-4779], Newman, Anne B [0000-0002-0106-1150], Sennblad, Bengt [0000-0002-4360-8003], Baldassarre, Damiano [0000-0002-2766-8882], Kuh, Diana [0000-0001-7386-2857], Schadt, Eric E [0000-0002-7892-8808], Rivadeneira, Fernando [0000-0001-9435-9441], Jukema, J Wouter [0000-0002-3246-8359], Rice, Kenneth [0000-0002-3071-7278], Dhana, Klodian [0000-0002-6397-7009], Dichgans, Martin [0000-0002-0654-387X], Traylor, Matthew [0000-0001-6624-8621], Kivimaki, Mika [0000-0002-4699-5627], Roussos, Panos [0000-0002-4640-6239], Amouyel, Philippe [0000-0001-9088-234X], Burkhardt, Ralph [0000-0003-1924-1202], Morris, Richard W [0000-0001-7240-4563], Hägg, Sara [0000-0002-2452-1500], Lawlor, Deborah A [0000-0002-6793-2262], Wilson, James F [0000-0001-5751-9178], Wardlaw, Joanna M [0000-0002-9812-6642], Lyytikäinen, Leo-Pekka [0000-0002-7200-5455], Gudnason, Vilmundur [0000-0001-5696-0084], Apollo - University of Cambridge Repository, Psychiatry, APH - Mental Health, APH - Digital Health, Epidemiology, Internal Medicine, and Experimental Immunology
Subjects: 0301 basic medicine, Candidate gene, Vascular damage Radboud Institute for Health Sciences [Radboudumc 16], General Physics and Astronomy, Genome-wide association study, Coronary Disease, VARIANTS, Carotid Intima-Media Thickness, Coronary artery disease, Protein-Lysine 6-Oxidase, Risk Factors, Medicine, genetics, Cardiac and Cardiovascular Systems, Blóðrásarsjúkdómar, lcsh:Science, GENE-PRODUCT, cardiovascular genetics, Multidisciplinary, Kardiologi, Plaque, Atherosclerotic, Urological cancers Radboud Institute for Health Sciences [Radboudumc 15], Cardiology, cardiovascular system, Medical genetics, CORONARY-ARTERY-DISEASE, HEART, Amino Acid Oxidoreductases, Erfðarannsóknir, Medical Genetics, medicine.medical_specialty, MEGASTROKE Consortium, Science, Quantitative Trait Loci, ADAMTS9 Protein, INTEGRATIVE ANALYSIS, Locus (genetics), 610 Medicine & health, Quantitative trait locus, Polymorphism, Single Nucleotide, Article, General Biochemistry, Genetics and Molecular Biology, 03 medical and health sciences, All institutes and research themes of the Radboud University Medical Center, 360 Social problems & social services, Internal medicine, MD Multidisciplinary, Humans, Erfðafræði, intima media thickness, Genetic Predisposition to Disease, cardiovascular diseases, GENOME-WIDE ASSOCIATION, METAANALYSIS, Genetic association, Medicinsk genetik, business.industry, General Chemistry, medicine.disease, 030104 developmental biology, Intima-media thickness, genome-wide association studies, quantitative trait loci, lcsh:Q, atherosclerosis, Lod Score, hjarta, business, Genome-Wide Association Study
Abstract: Publisher's version (útgefin grein), Carotid artery intima media thickness (cIMT) and carotid plaque are measures of subclinical atherosclerosis associated with ischemic stroke and coronary heart disease (CHD). Here, we undertake meta-analyses of genome-wide association studies (GWAS) in 71,128 individuals for cIMT, and 48,434 individuals for carotid plaque traits. We identify eight novel susceptibility loci for cIMT, one independent association at the previously-identified PINX1 locus, and one novel locus for carotid plaque. Colocalization analysis with nearby vascular expression quantitative loci (cis-eQTLs) derived from arterial wall and metabolic tissues obtained from patients with CHD identifies candidate genes at two potentially additional loci, ADAMTS9 and LOXL4. LD score regression reveals significant genetic correlations between cIMT and plaque traits, and both cIMT and plaque with CHD, any stroke subtype and ischemic stroke. Our study provides insights into genes and tissue-specific regulatory mechanisms linking atherosclerosis both to its functional genomic origins and its clinical consequences in humans., The work was supported by the following grants: National Institute of Health grants: R21HL123677, R21-HL140385, DK104806-01A1, R01-MD012765-01A1 (NF), National Institutes of Health awards R01HG009120, R01HG006399, U01CA194393, T32NS048004 (CG), the American Heart Association Grant #17POST33350042 (PV), the British Heart Foundation (RG/13/5/30112) and the National Institute for Health Research University College London Hospitals Biomedical Research Centre (RCL and RPH), the British Heart Foundation FS/14/55/30806 (JCH), the German Federal Ministry of Education and Research (BMBF) in the context of the e:Med program (e:AtheroSysMed), the DFG as part of the CRC 1123 (B3), and the FP7/2007-2103 European Union project CVgenes@target (grant agreement number Health-F2-2013-601456). We thank Li-Ming Gan for assistance with the STARNET study and Jon White for assistance with UCLEB analyses. Additional acknowledgements are included in Supplementary Note 2.
Published: 2018
Full Text: View/download PDF

29. Bi-allelic Loss-of-Function CACNA1B Mutations in Progressive Epilepsy-Dyskinesia

Author: Kathleen M. Gorman, Esther Meyer, Detelina Grozeva, Egidio Spinelli, Amy McTague, Alba Sanchis-Juan, Keren J. Carss, Emily Bryant, Adi Reich, Amy L. Schneider, Ronit M. Pressler, Michael A. Simpson, Geoff D. Debelle, Evangeline Wassmer, Jenny Morton, Diana Sieciechowicz, Eric Jan-Kamsteeg, Alex R. Paciorkowski, Mary D. King, J. Helen Cross, Annapurna Poduri, Heather C. Mefford, Ingrid E. Scheffer, Tobias B. Haack, Gary McCullagh, John J. Millichap, Gemma L. Carvill, Jill Clayton-Smith, Eamonn R. Maher, F. Lucy Raymond, Manju A. Kurian, Jeremy F. McRae, Stephen Clayton, Tomas W. Fitzgerald, Joanna Kaplanis, Elena Prigmore, Diana Rajan, Alejandro Sifrim, Stuart Aitken, Nadia Akawi, Mohsan Alvi, Kirsty Ambridge, Daniel M. Barrett, Tanya Bayzetinova, Philip Jones, Wendy D. Jones, Daniel King, Netravathi Krishnappa, Laura E. Mason, Tarjinder Singh, Adrian R. Tivey, Munaza Ahmed, Uruj Anjum, Hayley Archer, Ruth Armstrong, Jana Awada, Meena Balasubramanian, Siddharth Banka, Diana Baralle, Angela Barnicoat, Paul Batstone, David Baty, Chris Bennett, Jonathan Berg, Birgitta Bernhard, A. Paul Bevan, Maria Bitner-Glindzicz, Edward Blair, Moira Blyth, David Bohanna, Louise Bourdon, David Bourn, Lisa Bradley, Angela Brady, Simon Brent, Carole Brewer, Kate Brunstrom, David J. Bunyan, John Burn, Natalie Canham, Bruce Castle, Kate Chandler, Elena Chatzimichali, Deirdre Cilliers, Angus Clarke, Susan Clasper, Virginia Clowes, Andrea Coates, Trevor Cole, Irina Colgiu, Amanda Collins, Morag N. Collinson, Fiona Connell, Nicola Cooper, Helen Cox, Lara Cresswell, Gareth Cross, Yanick Crow, Mariella D’Alessandro, Tabib Dabir, Rosemarie Davidson, Sally Davies, Dylan de Vries, John Dean, Charu Deshpande, Gemma Devlin, Abhijit Dixit, Angus Dobbie, Alan Donaldson, Dian Donnai, Deirdre Donnelly, Carina Donnelly, Angela Douglas, Sofia Douzgou, Alexis Duncan, Jacqueline Eason, Sian Ellard, Ian Ellis, Frances Elmslie, Karenza Evans, Sarah Everest, Tina Fendick, Richard Fisher, Frances Flinter, Nicola Foulds, Andrew Fry, Alan Fryer, Carol Gardiner, Lorraine Gaunt, Neeti Ghali, Richard Gibbons, Harinder Gill, Judith Goodship, David Goudie, Emma Gray, Andrew Green, Philip Greene, Lynn Greenhalgh, Susan Gribble, Rachel Harrison, Lucy Harrison, Victoria Harrison, Rose Hawkins, Liu He, Stephen Hellens, Alex Henderson, Sarah Hewitt, Lucy Hildyard, Emma Hobson, Simon Holden, Muriel Holder, Susan Holder, Georgina Hollingsworth, Tessa Homfray, Mervyn Humphreys, Jane Hurst, Ben Hutton, Stuart Ingram, Melita Irving, Lily Islam, Andrew Jackson, Joanna Jarvis, Lucy Jenkins, Diana Johnson, Elizabeth Jones, Dragana Josifova, Shelagh Joss, Beckie Kaemba, Sandra Kazembe, Rosemary Kelsell, Bronwyn Kerr, Helen Kingston, Usha Kini, Esther Kinning, Gail Kirby, Claire Kirk, Emma Kivuva, Alison Kraus, Dhavendra Kumar, V. K. Ajith Kumar, Katherine Lachlan, Wayne Lam, Anne Lampe, Caroline Langman, Melissa Lees, Derek Lim, Cheryl Longman, Gordon Lowther, Sally A. Lynch, Alex Magee, Eddy Maher, Alison Male, Sahar Mansour, Karen Marks, Katherine Martin, Una Maye, Emma McCann, Vivienne McConnell, Meriel McEntagart, Ruth McGowan, Kirsten McKay, Shane McKee, Dominic J. McMullan, Susan McNerlan, Catherine McWilliam, Sarju Mehta, Kay Metcalfe, Anna Middleton, Zosia Miedzybrodzka, Emma Miles, Shehla Mohammed, Tara Montgomery, David Moore, Sian Morgan, Hood Mugalaasi, Victoria Murday, Helen Murphy, Swati Naik, Andrea Nemeth, Louise Nevitt, Ruth Newbury-Ecob, Andrew Norman, Rosie O’Shea, Caroline Ogilvie, Kai-Ren Ong, Soo-Mi Park, Michael J. Parker, Chirag Patel, Joan Paterson, Stewart Payne, Daniel Perrett, Julie Phipps, Daniela T. Pilz, Martin Pollard, Caroline Pottinger, Joanna Poulton, Norman Pratt, Katrina Prescott, Sue Price, Abigail Pridham, Annie Procter, Hellen Purnell, Oliver Quarrell, Nicola Ragge, Raheleh Rahbari, Josh Randall, Julia Rankin, Lucy Raymond, Debbie Rice, Leema Robert, Eileen Roberts, Jonathan Roberts, Paul Roberts, Gillian Roberts, Alison Ross, Elisabeth Rosser, Anand Saggar, Shalaka Samant, Julian Sampson, Richard Sandford, Ajoy Sarkar, Susann Schweiger, Richard Scott, Ingrid Scurr, Ann Selby, Anneke Seller, Cheryl Sequeira, Nora Shannon, Saba Sharif, Charles Shaw-Smith, Emma Shearing, Debbie Shears, Eamonn Sheridan, Ingrid Simonic, Roldan Singzon, Zara Skitt, Audrey Smith, Kath Smith, Sarah Smithson, Linda Sneddon, Miranda Splitt, Miranda Squires, Fiona Stewart, Helen Stewart, Volker Straub, Mohnish Suri, Vivienne Sutton, Ganesh Jawahar Swaminathan, Elizabeth Sweeney, Kate Tatton-Brown, Cat Taylor, Rohan Taylor, Mark Tein, I. Karen Temple, Jenny Thomson, Marc Tischkowitz, Susan Tomkins, Audrey Torokwa, Becky Treacy, Claire Turner, Peter Turnpenny, Carolyn Tysoe, Anthony Vandersteen, Vinod Varghese, Pradeep Vasudevan, Parthiban Vijayarangakannan, Julie Vogt, Emma Wakeling, Sarah Wallwark, Jonathon Waters, Astrid Weber, Diana Wellesley, Margo Whiteford, Sara Widaa, Sarah Wilcox, Emily Wilkinson, Denise Williams, Nicola Williams, Louise Wilson, Geoff Woods, Christopher Wragg, Michael Wright, Laura Yates, Michael Yau, Chris Nellåker, Michael Parker, Helen V. Firth, Caroline F. Wright, David R. FitzPatrick, Jeffrey C. Barrett, Matthew E. Hurles, Saeed Al Turki, Carl Anderson, Richard Anney, Dinu Antony, Maria Soler Artigas, Muhammad Ayub, Senduran Balasubramaniam, Inês Barroso, Phil Beales, Jamie Bentham, Shoumo Bhattacharya, Ewan Birney, Douglas Blackwood, Martin Bobrow, Elena Bochukova, Patrick Bolton, Rebecca Bounds, Chris Boustred, Gerome Breen, Mattia Calissano, Keren Carss, Krishna Chatterjee, Lu Chen, Antonio Ciampi, Sebhattin Cirak, Peter Clapham, Gail Clement, Guy Coates, David Collier, Catherine Cosgrove, Tony Cox, Nick Craddock, Lucy Crooks, Sarah Curran, David Curtis, Allan Daly, Aaron Day-Williams, Ian N.M. Day, Thomas Down, Yuanping Du, Ian Dunham, Sarah Edkins, Peter Ellis, David Evans, Sadaf Faroogi, Ghazaleh Fatemifar, David R. Fitzpatrick, Paul Flicek, James Flyod, A. Reghan Foley, Christopher S. Franklin, Marta Futema, Louise Gallagher, Matthias Geihs, Daniel Geschwind, Heather Griffin, Xueqin Guo, Xiaosen Guo, Hugh Gurling, Deborah Hart, Audrey Hendricks, Peter Holmans, Bryan Howie, Liren Huang, Tim Hubbard, Steve E. Humphries, Pirro Hysi, David K. Jackson, Yalda Jamshidi, Tian Jing, Chris Joyce, Jane Kaye, Thomas Keane, Julia Keogh, John Kemp, Karen Kennedy, Anja Kolb-Kokocinski, Genevieve Lachance, Cordelia Langford, Daniel Lawson, Irene Lee, Monkol Lek, Jieqin Liang, Hong Lin, Rui Li, Yingrui Li, Ryan Liu, Jouko Lönnqvist, Margarida Lopes, Valentina Iotchkova, Daniel MacArthur, Jonathan Marchini, John Maslen, Mangino Massimo, Iain Mathieson, Gaëlle Marenne, Peter McGuffin, Andrew McIntosh, Andrew G. McKechanie, Andrew McQuillin, Sarah Metrustry, Hannah Mitchison, Alireza Moayyeri, James Morris, Francesco Muntoni, Kate Northstone, Michael O'Donnovan, Alexandros Onoufriadis, Stephen O'Rahilly, Karim Oualkacha, Michael J. Owen, Aarno Palotie, Kalliope Panoutsopoulou, Victoria Parker, Jeremy R. Parr, Lavinia Paternoster, Tiina Paunio, Felicity Payne, Olli Pietilainen, Vincent Plagnol, Lydia Quaye, Michael A. Quail, Karola Rehnström, Susan Ring, Graham R.S. Ritchie, Nicola Roberts, David B. Savage, Peter Scambler, Stephen Schiffels, Miriam Schmidts, Nadia Schoenmakers, Robert K. Semple, Eva Serra, Sally I. Sharp, So-Youn Shin, David Skuse, Kerrin Small, Lorraine Southam, Olivera Spasic-Boskovic, David St Clair, Jim Stalker, Elizabeth Stevens, Beate St Pourcian, Jianping Sun, Jaana Suvisaari, Ionna Tachmazidou, Martin D. Tobin, Ana Valdes, Margriet Van Kogelenberg, Peter M. Visscher, Louise V. Wain, James T.R. Walters, Guangbiao Wang, Jun Wang, Yu Wang, Kirsten Ward, Elanor Wheeler, Tamieka Whyte, Hywel Williams, Kathleen A. Williamson, Crispian Wilson, Kim Wong, ChangJiang Xu, Jian Yang, Fend Zhang, Pingbo Zhang, Timothy Aitman, Hana Alachkar, Sonia Ali, Louise Allen, David Allsup, Gautum Ambegaonkar, Julie Anderson, Richard Antrobus, Gavin Arno, Gururaj Arumugakani, Sofie Ashford, William Astle, Antony Attwood, Steve Austin, Chiara Bacchelli, Tamam Bakchoul, Tadbir K. Bariana, Helen Baxendale, David Bennett, Claire Bethune, Shahnaz Bibi, Marta Bleda, Harm Boggard, Paula Bolton-Maggs, Claire Booth, John R. Bradley, Angie Brady, Matthew Brown, Michael Browning, Christine Bryson, Siobhan Burns, Paul Calleja, Jenny Carmichael, Mark Caulfield, Elizabeth Chalmers, Anita Chandra, Patrick Chinnery, Manali Chitre, Colin Church, Emma Clement, Naomi Clements-Brod, Gerry Coghlan, Peter Collins, Nichola Cooper, Amanda Creaser-Myers, Rosa DaCosta, Louise Daugherty, Sophie Davies, John Davis, Minka De Vries, Patrick Deegan, Sri V.V. Deevi, Lisa Devlin, Eleanor Dewhurst, Rainer Doffinger, Natalie Dormand, Elizabeth Drewe, David Edgar, William Egner, Wendy N. Erber, Marie Erwood, Tamara Everington, Remi Favier, Helen Firth, Debra Fletcher, James C. Fox, Amy Frary, Kathleen Freson, Bruce Furie, Abigail Furnell, Daniel Gale, Alice Gardham, Michael Gattens, Pavandeep K. Ghataorhe, Rohit Ghurye, Simon Gibbs, Kimberley Gilmour, Paul Gissen, Sarah Goddard, Keith Gomez, Pavel Gordins, Stefan Gräf, Daniel Greene, Alan Greenhalgh, Andreas Greinacher, Sofia Grigoriadou, Scott Hackett, Charaka Hadinnapola, Rosie Hague, Matthias Haimel, Csaba Halmagyi, Tracey Hammerton, Daniel Hart, Grant Hayman, Johan W.M. Heemskerk, Robert Henderson, Anke Hensiek, Yvonne Henskens, Archana Herwadkar, Fengyuan Hu, Aarnoud Huissoon, Marc Humbert, Roger James, Stephen Jolles, Rashid Kazmi, David Keeling, Peter Kelleher, Anne M. Kelly, Fiona Kennedy, David Kiely, Nathalie Kingston, Ania Koziell, Deepa Krishnakumar, Taco W. Kuijpers, Dinakantha Kumararatne, Manju Kurian, Michael A. Laffan, Michele P. Lambert, Hana Lango Allen, Allan Lawrie, Sara Lear, Claire Lentaigne, Ri Liesner, Rachel Linger, Hilary Longhurst, Lorena Lorenzo, Rajiv Machado, Rob Mackenzie, Robert MacLaren, Eamonn Maher, Jesmeen Maimaris, Sarah Mangles, Ania Manson, Rutendo Mapeta, Hugh S. Markus, Jennifer Martin, Larahmie Masati, Mary Mathias, Vera Matser, Anna Maw, Elizabeth McDermott, Coleen McJannet, Stuart Meacham, Sharon Meehan, Karyn Megy, Michel Michaelides, Carolyn M. Millar, Shahin Moledina, Anthony Moore, Nicholas Morrell, Andrew Mumford, Sai Murng, Elaine Murphy, Sergey Nejentsev, Sadia Noorani, Paquita Nurden, Eric Oksenhendler, Willem H. Ouwehand, Sofia Papadia, Alasdair Parker, John Pasi, Chris Patch, Jeanette Payne, Andrew Peacock, Kathelijne Peerlinck, Christopher J. Penkett, Joanna Pepke-Zaba, David J. Perry, Val Pollock, Gary Polwarth, Mark Ponsford, Waseem Qasim, Isabella Quinti, Stuart Rankin, Karola Rehnstrom, Evan Reid, Christopher J. Rhodes, Michael Richards, Sylvia Richardson, Alex Richter, Irene Roberts, Matthew Rondina, Catherine Roughley, Kevin Rue-Albrecht, Crina Samarghitean, Saikat Santra, Ravishankar Sargur, Sinisa Savic, Sol Schulman, Harald Schulze, Marie Scully, Suranjith Seneviratne, Carrock Sewell, Olga Shamardina, Debbie Shipley, Ilenia Simeoni, Suthesh Sivapalaratnam, Kenneth Smith, Aman Sohal, Laura Southgate, Simon Staines, Emily Staples, Hans Stauss, Penelope Stein, Jonathan Stephens, Kathleen Stirrups, Sophie Stock, Jay Suntharalingam, R. Campbell Tait, Kate Talks, Yvonne Tan, Jecko Thachil, James Thaventhiran, Ellen Thomas, Moira Thomas, Dorothy Thompson, Adrian Thrasher, Catherine Titterton, Cheng-Hock Toh, Mark Toshner, Carmen Treacy, Richard Trembath, Salih Tuna, Wojciech Turek, Ernest Turro, Chris Van Geet, Marijke Veltman, Julie von Ziegenweldt, Anton Vonk Noordegraaf, Ivy Wanjiku, Timothy Q. Warner, Hugh Watkins, Andrew Webster, Steve Welch, Sarah Westbury, John Wharton, Deborah Whitehorn, Martin Wilkins, Lisa Willcocks, Catherine Williamson, Geoffrey Woods, John Wort, Nigel Yeatman, Patrick Yong, Tim Young, Ping Yu, Paediatric Infectious Diseases / Rheumatology / Immunology, ARD - Amsterdam Reproduction and Development, Pediatric surgery, APH - Aging & Later Life, Molecular cell biology and Immunology, Pulmonary medicine, ACS - Pulmonary hypertension & thrombosis, and APH - Quality of Care
Subjects: 0301 basic medicine, Male, Adolescent, Loss of Heterozygosity, Context (language use), Postnatal microcephaly, Neurotransmission, medicine.disease_cause, Bioinformatics, Synaptic Transmission, Loss of heterozygosity, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Calcium Channels, N-Type, Report, Genetics, medicine, Humans, Child, Genetics (clinical), Mutation, Dyskinesias, business.industry, Infant, medicine.disease, Hypotonia, Pedigree, 030104 developmental biology, Dyskinesia, Child, Preschool, Calcium, Female, medicine.symptom, business, 030217 neurology & neurosurgery
Abstract: © 2019 American Society of Human Genetics The occurrence of non-epileptic hyperkinetic movements in the context of developmental epileptic encephalopathies is an increasingly recognized phenomenon. Identification of causative mutations provides an important insight into common pathogenic mechanisms that cause both seizures and abnormal motor control. We report bi-allelic loss-of-function CACNA1B variants in six children from three unrelated families whose affected members present with a complex and progressive neurological syndrome. All affected individuals presented with epileptic encephalopathy, severe neurodevelopmental delay (often with regression), and a hyperkinetic movement disorder. Additional neurological features included postnatal microcephaly and hypotonia. Five children died in childhood or adolescence (mean age of death: 9 years), mainly as a result of secondary respiratory complications. CACNA1B encodes the pore-forming subunit of the pre-synaptic neuronal voltage-gated calcium channel Cav2.2/N-type, crucial for SNARE-mediated neurotransmission, particularly in the early postnatal period. Bi-allelic loss-of-function variants in CACNA1B are predicted to cause disruption of Ca2+ influx, leading to impaired synaptic neurotransmission. The resultant effect on neuronal function is likely to be important in the development of involuntary movements and epilepsy. Overall, our findings provide further evidence for the key role of Cav2.2 in normal human neurodevelopment.
Published: 2018
Full Text: View/download PDF

30. Circulating Vitamin K1 Levels in Relation to Ischemic Stroke and Its Subtypes: A Mendelian Randomization Study

Author: Matthew Traylor, Susanna C. Larsson, and Hugh S. Markus
Subjects: 0301 basic medicine, Vitamin, medicine.medical_specialty, Single-nucleotide polymorphism, lcsh:TX341-641, 030204 cardiovascular system & hematology, 03 medical and health sciences, chemistry.chemical_compound, single nucleotide polymorphisms, 0302 clinical medicine, Internal medicine, Mendelian randomization, Genetic predisposition, medicine, vitamin K1, Stroke, Nutrition and Dietetics, Vascular disease, business.industry, Odds ratio, medicine.disease, stroke, Confidence interval, 030104 developmental biology, chemistry, Cardiology, business, lcsh:Nutrition. Foods and food supply, Food Science
Abstract: Vitamin K plays a crucial role in blood coagulation, and hypercoagulability has been linked to atherosclerosis-related vascular disease. We used the Mendelian randomization study design to examine whether circulating vitamin K1 (phylloquinone) levels are associated with ischemic stroke. Four single-nucleotide polymorphisms associated with vitamin K1 levels were used as instrumental variables. Summary-level data for large artery atherosclerotic stroke (n = 4373 cases), small vessel stroke (n = 5386 cases), cardioembolic stroke (n = 7193 cases), and any ischemic stroke (n = 34,217 cases and 404,630 non-cases) were available from the MEGASTROKE consortium. Genetically-predicted circulating vitamin K1 levels were associated with large artery atherosclerotic stroke but not with any other subtypes or ischemic stroke as a whole. The odds ratios per genetically predicted one nmol/L increase in natural log-transformed vitamin K1 levels were 1.31 (95% confidence interval (CI) 1.12&ndash, 1.53, p = 7.0 &times, 10&minus, 4) for large artery atherosclerotic stroke, 0.98 (95% CI 0.85&ndash, 1.12, p = 0.73) for small vessel stroke, 1.01 (95% CI 0.90&ndash, 1.14, p = 0.84) for cardioembolic stroke, and 1.05 (95% CI 0.99&ndash, 1.11, p = 0.11) for any ischemic stroke. These findings indicate that genetic predisposition to higher circulating vitamin K1 levels is associated with an increased risk of large artery atherosclerotic stroke.
Published: 2018

31. De Novo Truncating Mutations in WASF1 Cause Intellectual Disability with Seizures

Author: Yoko Ito, Keren J. Carss, Sofia T. Duarte, Taila Hartley, Boris Keren, Manju A. Kurian, Isabelle Marey, Perinne Charles, Carla Mendonça, Caroline Nava, Rolph Pfundt, Alba Sanchis-Juan, Hans van Bokhoven, Anthony van Essen, Conny van Ravenswaaij-Arts, Kym M. Boycott, Kristin D. Kernohan, Sarah Dyack, F. Lucy Raymond, Timothy Aitman, David Bennett, Mark Caulfield, Patrick Chinnery, Daniel Gale, Ania Koziell, Taco W. Kuijpers, Michael A. Laffan, Eamonn Maher, Hugh S. Markus, Nicholas W. Morrell, Willem H. Ouwehand, David J. Perry, Irene Roberts, Kenneth G.C. Smith, Adrian Thrasher, Hugh Watkins, Catherine Williamson, Geoffrey Woods, Sofie Ashford, John R. Bradley, Debra Fletcher, Tracey Hammerton, Roger James, Nathalie Kingston, Christopher J. Penkett, Kathleen Stirrups, Marijke Veltman, Tim Young, Matthew Brown, Naomi Clements-Brod, John Davis, Eleanor Dewhurst, Helen Dolling, Marie Erwood, Amy Frary, Rachel Linger, Jennifer M. Martin, Sofia Papadia, Karola Rehnstrom, Hannah Stark, David Allsup, Steve Austin, Tamam Bakchoul, Tadbir K. Bariana, Paula Bolton-Maggs, Elizabeth Chalmers, Janine Collins, Peter Collins, Wendy N. Erber, Tamara Everington, Remi Favier, Kathleen Freson, Bruce Furie, Michael Gattens, Johanna Gebhart, Keith Gomez, Daniel Greene, Andreas Greinacher, Paolo Gresele, Daniel Hart, Johan W.M. Heemskerk, Yvonne Henskens, Rashid Kazmi, David Keeling, Anne M. Kelly, Michele P. Lambert, Claire Lentaigne, Ri Liesner, Mike Makris, Sarah Mangles, Mary Mathias, Carolyn M. Millar, Andrew Mumford, Paquita Nurden, Jeanette Payne, John Pasi, Kathelijne Peerlinck, Shoshana Revel-Vilk, Michael Richards, Matthew Rondina, Catherine Roughley, Sol Schulman, Harald Schulze, Marie Scully, Suthesh Sivapalaratnam, Matthew Stubbs, R. Campbell Tait, Kate Talks, Jecko Thachil, Cheng-Hock Toh, Ernest Turro, Chris Van Geet, Minka De Vries, Timothy Q. Warner, Henry Watson, Sarah Westbury, Abigail Furnell, Rutendo Mapeta, Paula Rayner-Matthews, Ilenia Simeoni, Simon Staines, Jonathan Stephens, Christopher Watt, Deborah Whitehorn, Antony Attwood, Louise Daugherty, Sri V.V. Deevi, Csaba Halmagyi, Fengyuan Hu, Vera Matser, Stuart Meacham, Karyn Megy, Olga Shamardina, Catherine Titterton, Salih Tuna, Ping Yu, Julie von Ziegenweldt, William Astle, Marta Bleda, Stefan Gräf, Matthias Haimel, Hana Lango-Allen, Sylvia Richardson, Paul Calleja, Stuart Rankin, Wojciech Turek, Julie Anderson, Christine Bryson, Jenny Carmichael, Coleen McJannet, Sophie Stock, Louise Allen, Gautum Ambegaonkar, Ruth Armstrong, Gavin Arno, Maria Bitner-Glindzicz, Angie Brady, Natalie Canham, Manali Chitre, Emma Clement, Virginia Clowes, Patrick Deegan, Charu Deshpande, Rainer Doffinger, Helen Firth, Frances Flinter, Courtney French, Alice Gardham, Neeti Ghali, Paul Gissen, Detelina Grozeva, Robert Henderson, Anke Hensiek, Simon Holden, Muriel Holder, Susan Holder, Jane Hurst, Dragana Josifova, Deepa Krishnakumar, Melissa Lees, Robert MacLaren, Anna Maw, Sarju Mehta, Michel Michaelides, Anthony Moore, Elaine Murphy, Soo-Mi Park, Alasdair Parker, Chris Patch, Joan Paterson, Julia Rankin, Evan Reid, Elisabeth Rosser, Richard Sandford, Saikat Santra, Richard Scott, Aman Sohal, Penelope Stein, Ellen Thomas, Dorothy Thompson, Marc Tischkowitz, Julie Vogt, Emma Wakeling, Evangeline Wassmer, Andrew Webster, Sonia Ali, Souad Ali, Harm J. Boggard, Colin Church, Gerry Coghlan, Victoria Cookson, Paul A. Corris, Amanda Creaser-Myers, Rosa DaCosta, Natalie Dormand, Mélanie Eyries, Henning Gall, Pavandeep K. Ghataorhe, Stefano Ghio, Ardi Ghofrani, J. Simon R. Gibbs, Barbara Girerd, Alan Greenhalgh, Charaka Hadinnapola, Arjan C. Houweling, Marc Humbert, Anna Huis in’t Veld, Fiona Kennedy, David G. Kiely, Gabor Kovacs, Allan Lawrie, Rob V. Mackenzie Ross, Rajiv Machado, Larahmie Masati, Sharon Meehan, Shahin Moledina, David Montani, Shokri Othman, Andrew J. Peacock, Joanna Pepke-Zaba, Val Pollock, Gary Polwarth, Lavanya Ranganathan, Christopher J. Rhodes, Kevin Rue-Albrecht, Gwen Schotte, Debbie Shipley, Florent Soubrier, Laura Southgate, Laura Scelsi, Jay Suntharalingam, Yvonne Tan, Mark Toshner, Carmen M. Treacy, Richard Trembath, Anton Vonk Noordegraaf, Sara Walker, Ivy Wanjiku, John Wharton, Martin Wilkins, Stephen J. Wort, Katherine Yates, Hana Alachkar, Richard Antrobus, Gururaj Arumugakani, Chiara Bacchelli, Helen Baxendale, Claire Bethune, Shahnaz Bibi, Claire Booth, Michael Browning, Siobhan Burns, Anita Chandra, Nichola Cooper, Sophie Davies, Lisa Devlin, Elizabeth Drewe, David Edgar, William Egner, Rohit Ghurye, Kimberley Gilmour, Sarah Goddard, Pavel Gordins, Sofia Grigoriadou, Scott Hackett, Rosie Hague, Lorraine Harper, Grant Hayman, Archana Herwadkar, Aarnoud Huissoon, Stephen Jolles, Peter Kelleher, Dinakantha Kumararatne, Sara Lear, Hilary Longhurst, Lorena Lorenzo, Jesmeen Maimaris, Ania Manson, Elizabeth McDermott, Sai Murng, Sergey Nejentsev, Sadia Noorani, Eric Oksenhendler, Mark Ponsford, Waseem Qasim, Isabella Quinti, Alex Richter, Crina Samarghitean, Ravishankar Sargur, Sinisa Savic, Suranjith Seneviratne, Carrock Sewell, Emily Staples, Hans Stauss, James Thaventhiran, Moira Thomas, Steve Welch, Lisa Willcocks, Nigel Yeatman, Patrick Yong, Phil Ancliff, Christian Babbs, Mark Layton, Eleni Louka, Simon McGowan, Adam Mead, Noémi Roy, Jenny Chambers, Peter Dixon, Cecelia Estiu, Bill Hague, Hanns-Ulrich Marschall, Michael Simpson, Sam Chong, Ingrid Emmerson, Lionel Ginsberg, David Gosal, Rob Hadden, Rita Horvath, Mohamed Mahdi-Rogers, Adnan Manzur, Andrew Marshall, Emma Matthews, Mark McCarthy, Mary Reilly, Tara Renton, Andrew Rice, Andreas Themistocleous, Tom Vale, Natalie Van Zuydam, Suellen Walker, Liz Ormondroyd, Gavin Hudson, Wei Wei, Patrick Yu Wai Man, James Whitworth, Maryam Afzal, Elizabeth Colby, Moin Saleem, Omid S. Alavijeh, H. Terry Cook, Sally Johnson, Adam P. Levine, Edwin K.S. Wong, Rhea Tan, Alex MacKenzie, Jacek Majewski, Michael Brudno, Dennis Bulman, David Dyment, Freson, Kathleen, Peerlinck, Kathelijne, Van Geet, Christel, Paediatric Infectious Diseases / Rheumatology / Immunology, ARD - Amsterdam Reproduction and Development, RS: CARIM - R1.04 - Clinical thrombosis and haemostasis, MUMC+: DA CDL Algemeen (9), Med Microbiol, Infect Dis & Infect Prev, Medical Research Council (MRC), Clinical Cognitive Neuropsychiatry Research Program (CCNP), APH - Aging & Later Life, Pediatric surgery, Human genetics, ACS - Atherosclerosis & ischemic syndromes, CCA - Cancer biology and immunology, CCA - Cancer Treatment and quality of life, Pulmonary medicine, ACS - Pulmonary hypertension & thrombosis, APH - Quality of Care, and Molecular cell biology and Immunology
Subjects: 0301 basic medicine, Male, Care4Rare Canada Consortium, WAVE FAMILY PROTEINS, actin cytoskeleton, PROTEIN, HDE NEU PED, medicine.disease_cause, Whole Exome Sequencing, 0302 clinical medicine, Neurodevelopmental disorder, SYNAPTIC PLASTICITY, Intellectual disability, WAVE1 complex, PLASTICITY, EXCHANGE, 11 Medical and Health Sciences, Exome sequencing, Genetics (clinical), seizures, Genetics & Heredity, Genetics, Mutation, WASF1, DENDRITIC SPINES, developmental delay, Female, DISEASE GENE-DISCOVERY, Adult, Heterozygote, GENES, DISORDERS, autism, Biology, ACTIN, 03 medical and health sciences, Young Adult, Seizures, Report, Intellectual Disability, Exome Sequencing, medicine, Humans, PROTRUSIONS, recurrent de novo truncating mutations, Neurodevelopmental disorders Donders Center for Medical Neuroscience [Radboudumc 7], COMPLEX, lamellipodia, neurodevelopmental disorder, Actin remodeling, Heterozygote advantage, NIHR BioResource, 06 Biological Sciences, medicine.disease, Actin cytoskeleton, Wiskott-Aldrich Syndrome Protein Family, 030104 developmental biology, WAVE, RETARDATION, 030217 neurology & neurosurgery
Abstract: Next-generation sequencing has been invaluable in the elucidation of the genetic etiology of many subtypes of intellectual disability in recent years. Here, using exome sequencing and whole-genome sequencing, we identified three de novo truncating mutations in WAS protein family member 1 (WASF1) in five unrelated individuals with moderate to profound intellectual disability with autistic features and seizures. WASF1, also known as WAVE1, is part of the WAVE complex and acts as a mediator between Rac-GTPase and actin to induce actin polymerization. The three mutations connected by Matchmaker Exchange were c.1516C>T (p.Arg506Ter), which occurs in three unrelated individuals, c.1558C>T (p.Gln520Ter), and c.1482delinsGCCAGG (p.Ile494MetfsTer23). All three variants are predicted to partially or fully disrupt the C-terminal actin-binding WCA domain. Functional studies using fibroblast cells from two affected individuals with the c.1516C>T mutation showed a truncated WASF1 and a defect in actin remodeling. This study provides evidence that de novo heterozygous mutations in WASF1 cause a rare form of intellectual disability. ispartof: AMERICAN JOURNAL OF HUMAN GENETICS vol:103 issue:1 pages:144-153 ispartof: location:United States status: published
Published: 2018
Full Text: View/download PDF

32. Serum Parathyroid Hormone, 25-Hydroxyvitamin D, and Risk of Alzheimer's Disease : A Mendelian Randomization Study

Author: Susanna C. Larsson, Hugh S. Markus, Karl Michaëlsson, and Matthew Traylor
Subjects: 0301 basic medicine, medicine.medical_specialty, Parathyroid hormone, lcsh:TX341-641, Single-nucleotide polymorphism, vitamin D, Disease, Orthopaedics, Polymorphism, Single Nucleotide, Article, 03 medical and health sciences, 0302 clinical medicine, Gene Frequency, Alzheimer Disease, Risk Factors, Internal medicine, Mendelian randomization, medicine, Vitamin D and neurology, Humans, parathyroid hormone, Genetic Predisposition to Disease, Allele, Nutrition and Dietetics, business.industry, Odds ratio, Mendelian Randomization Analysis, Protective Factors, 030104 developmental biology, Endocrinology, Phenotype, Case-Control Studies, Ortopedi, business, lcsh:Nutrition. Foods and food supply, Alzheimer’s disease, 030217 neurology & neurosurgery, Biomarkers, hormones, hormone substitutes, and hormone antagonists, Food Science, Genome-Wide Association Study
Abstract: We conducted Mendelian randomization analyses to investigate the associations of serum parathyroid hormone (S-PTH) and serum 25-hydroxyvitamin D (S-25OHD) concentrations with Alzheimer&rsquo, s disease (AD). Five and seven single nucleotide polymorphisms associated with S-PTH and S-25OHD concentrations, respectively, were used as instrumental variables. Data for AD were acquired from the International Genomics of Alzheimer&rsquo, s Project (17,008 AD cases and 37,154 controls). Genetically higher S-PTH concentrations were not associated with AD (odds ratio per standard deviation increase in S-PTH = 1.11, 95% CI 0.97&ndash, 1.26, p = 0.12). In contrast, all seven 25OHD-increasing alleles were inversely associated with AD and two of the associations were statistically significant (p &lt, 0.05). The odds ratio of AD per genetically-predicted one standard deviation increase in S-25OHD was 0.86 (95% CI 0.78&ndash, 0.94, p = 0.002). This study provides evidence that vitamin D may play a role in AD but found no significant association between S-PTH and AD.
Published: 2018

33. Lancet Neurol

Author: Katherine Crawford, Christopher D. Anderson, Stéphanie Debette, Sudha Seshadri, Jennifer J. Majersik, Jordi Jimenez-Conde, Hugh S. Markus, Daniel Woo, Myriam Fornage, Jin-Moo Lee, Jane Maguire, Arne Lindgren, Bordeaux population health (BPH), and Université de Bordeaux (UB)-Institut de Santé Publique, d'Épidémiologie et de Développement (ISPED)-Institut National de la Santé et de la Recherche Médicale (INSERM)
Subjects: 0301 basic medicine, Gerontology, medicine.medical_specialty, Neurology, business.industry, Research, medicine.disease, Stroke, 03 medical and health sciences, 030104 developmental biology, VINTAGE, medicine, Humans, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Neurology (clinical), business, Genetic Association Studies
Published: 2018
Full Text: View/download PDF

34. Genetics and Genomics of Stroke

Author: Rhea Y. Y. Tan and Hugh S. Markus
Subjects: 0301 basic medicine, medicine.medical_specialty, business.industry, Cervical Artery, Arteriovenous malformation, Disease, medicine.disease, Lesion, 03 medical and health sciences, Dissection, 030104 developmental biology, 0302 clinical medicine, Internal medicine, Cardiology, Medicine, cardiovascular diseases, Cerebral amyloid angiopathy, medicine.symptom, business, CADASIL, Stroke, 030217 neurology & neurosurgery
Abstract: Stroke is defined as the acute onset of focal neurological disturbance arising due to a cerebrovascular cause, confirmed histopathologically or on imaging, where other causes have been excluded. Strokes may either be ischaemic (approximately 80% of cases) or haemorrhagic (20%). Although often thought of as a single disease, stroke represents the end stage of many different pathologies, each of which can result in cerebral ischaemia and/or haemorrhage. Therefore when investigating a stroke patient, investigations are performed to identify the underlying cause. Most cases of ischaemic stroke are caused by one of three pathologies: large vessel atherosclerotic disease (LVD), cerebral small vessel disease (SVD) or cardioembolism, although there are multiple rarer causes including cervical artery dissection. However, even with detailed investigation an underlying cause cannot be found in approximately a quarter of all ischaemic strokes. Haemorrhagic strokes are categorized according to the brain region they arise from; lobar or cortical haemorrhages are commonly caused by cerebral amyloid angiopathy, or an underlying structural lesion for example an arteriovenous malformation. Subcortical haemorrhages are usually associated with hypertension and believed to be often a manifestation of SVD.
Published: 2018
Full Text: View/download PDF

35. Workshop proceedings, Jan 25-26th 2017

Author: Karen Horsburgh, Joanna M. Wardlaw, Tom van Agtmael, Stuart M. Allan, Mike L.J. Ashford, Philip M. Bath, Rosalind Brown, Jason Berwick, M. Zameel Cader, Roxana O. Carare, John B. Davis, Jessica Duncombe, Tracy D. Farr, Jill H. Fowler, Jozien Goense, Alessandra Granata, Catherine N. Hall, Atticus H. Hainsworth, Adam Harvey, Cheryl A. Hawkes, Anne Joutel, Rajesh N. Kalaria, Patrick G. Kehoe, Catherine B. Lawrence, Andy Lockhart, Seth Love, Malcolm R. Macleod, I. Mhairi Macrae, Hugh S. Markus, Chris McCabe, Barry W. McColl, Paul J. Meakin, Alyson Miller, Maiken Nedergaard, Michael O'Sullivan, Terry J. Quinn, Rikesh Rajani, Lisa M. Saksida, Colin Smith, Kenneth J. Smith, Rhian M. Touyz, Rebecca C. Trueman, Tao Wang, Anna Williams, Steven C.R. Williams, and Lorraine M. Work
Subjects: 0301 basic medicine, Gerontology, Lydia Becker Institute, Scope (project management), Vascular disease, business.industry, Psychological intervention, Review, General Medicine, Disease, medicine.disease, Article, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, ResearchInstitutes_Networks_Beacons/lydia_becker_institute_of_immunology_and_inflammation, Journal Article, medicine, Dementia, Small vessel, Cognitive impairment, business, Stroke, 030217 neurology & neurosurgery
Abstract: Cerebral small vessel disease (SVD) is a major health challenge. Therapeutic approaches remain limited, hampered by the lack of mechanistic understanding and identification of therapeutic targets. Relevant animal models could provide a cornerstone to basic scientific studies of disease mechanisms and pre-clinical studies of potential therapies, but there is a critical need to improve the current translational gap that exists between pre-clinical research and treatments in patients. The Medical Research Council Dementias Platform UK (MRC DPUK) Vascular Experimental Medicine Theme identified that a comprehensive assessment of the latest developments in animal models and of their contribution to understanding of cerebral microvascular disease would reduce the translational gap. In response to this, a two day workshop took place in late January 2017 at the British Heart Foundation Centre of Research Excellence in Glasgow, Scotland in conjunction with MRC DPUK and brought together experts from several disciplines in cerebrovascular disease, dementia and cardiovascular biology, to highlight current advances in these fields, explore synergies and scope for development. There were presentations from UK and international researchers and a specific focus on animal models of cerebral microvascular disease and dementia, considering vascular biology, neurogliovascular coupling, blood-brain barrier function, neuroinflammation, cerebral drainage pathways, and methodological and translational challenges (see Figure 1 for the general organisation of the meeting including the key topics and themes discussed). This overview provides a summary of the key talks, with a particular focus on mechanisms of cerebral vascular disease (see Figure 2) and improving translation. These talks were followed by related themed discussion groups on the gaps in knowledge and requirements to advance knowledge, the outcomes of which are highlighted in Table 1. Additional related articles are published in the Special Edition of Clinical Science (http://www.portlandpresspublishing.com/cc/small-vessels).
Published: 2018
Full Text: View/download PDF

36. Cross-ancestry genome-wide association analysis of corneal thickness strengthens link between complex and Mendelian eye diseases

Author: Nicholas G. Martin, René Höhn, Paul Mitchell, Gavin Band, Pamela Whittaker, Michelle Ricketts, Pirro G. Hysi, Jenefer M. Blackwell, Grant W. Montgomery, Elena Rochtchina, Manfred E. Beutel, Richard A. Mills, Anna Rautanen, Alagurevathi Jayakumar, Colin Freeman, Stephen Sawcer, Stuart MacGregor, Irene Schmidtmann, Cornelia M. van Duijn, Nicholas W. Wood, Sayoko E. Moroi, Jonathan L. Haines, Aniket Mishra, Ananth C. Viswanathan, Jie Jin Wang, Donald L. Budenz, Seyhan Yazar, Janey L. Wiggs, Garrett Hellenthal, Kathryn P. Burdon, Jerome I. Rotter, Jamie E Craig, Puya Gharahkhani, Juan P. Casas, R. Rand Allingham, Jost B. Jonas, Ozren Polasek, Julia E. Richards, Sarah Edkins, Rodney J. Scott, Abhishek Nag, Tanja Zeller, Rhian Gwilliam, Chris C. A. Spencer, David S. Friedman, Adriana I Iglesias, Radhi Ravindrarajah, Kent D. Taylor, Caroline Hayward, Eleni Giannoulatou, David A. Mackey, Michael A. Hauser, Paul J. Foster, Emma Gray, Audrey Duncanson, Yih Chung Tham, Murray H. Brilliant, Ching-Yu Cheng, William K. Scott, Robert N. Weinreb, Hugh S. Markus, Xueling Sim, David S. Siscovick, Matti Pirinen, John H. Fingert, Yelena Bykhovskaya, Louis R. Pasquale, Peter Donnelly, Donald J. Zack, Kuldev Singh, Cordelia Langford, Zhan Su, Céline Bellenguez, Joel S. Schuman, Peter Kraft, Christopher G. Mathew, Hannah Blackburn, Sara Widaa, Yuan Shi, Gabriel Cuellar-Partida, André G. Uitterlinden, Naomi Hammond, Panos Deloukas, Richard K. Lee, Robert Plomin, Jessica N. Cooke Bailey, Jae H. Kang, John Attia, Yutao Liu, Simon C. Potter, Jennifer Liddle, Matthew Gillman, Alex W. Hewitt, Margaret A. Pericak-Vance, James F. Wilson, Tien Yin Wong, Elvira Bramon, Janusz Jankowski, Henriët Springelkamp, Sarah E. Hunt, Anthony P Khawaja, Veronique Vitart, Xiaohui Li, Pieter W.M. Bonnemaijer, Damjan Vukcevic, Paul R. Lichter, Aiden Corvin, Sionne E. M. Lucas, Matthew Waller, Caroline C W Klaver, Douglas E. Gaasterland, Terry Gaasterland, Norbert Pfeiffer, Douglas Vollrath, Anthony Realini, Eranga N. Vithana, Gadi Wollstein, Thibaud Boutin, Owen T. McCann, Paul A. Weston, Lisa S. Kearns, Inês Barroso, Richard G. Pearson, Christopher J Hammond, Colin N. A. Palmer, Michael Inouye, Chiea Chuen Khor, Stephanie Loomis, Sandra E Staffieri, Yaron S. Rabinowitz, Richard C. Trembath, Tin Aung, William G. Christen, Paul N. Baird, Jing Xie, Elisabeth M. van Leeuwen, Serge Dronov, Arthur J. Sit, Colin E. Willoughby, Kang Zhang, Matthew A. Brown, Suzannah Bumpstead, Amy Strange, Elizabeth G. Holliday, Clinical Genetics, Epidemiology, Ophthalmology, Internal Medicine, Experimental Immunology, Bordeaux population health (BPH), Université de Bordeaux (UB)-Institut de Santé Publique, d'Épidémiologie et de Développement (ISPED)-Institut National de la Santé et de la Recherche Médicale (INSERM), Iglesias, Adriana I [0000-0001-5532-764X], Gharahkhani, Puya [0000-0002-4203-5952], Bailey, Jessica N Cooke [0000-0002-4001-8702], Li, Xiaohui [0000-0002-5037-3572], Khawaja, Anthony P [0000-0001-6802-8585], Haines, Jonathan L [0000-0002-4351-4728], Hayward, Caroline [0000-0002-9405-9550], Bonnemaijer, Pieter [0000-0001-5154-6765], Staffieri, Sandra E [0000-0003-3131-9359], Jonas, Jost B [0000-0003-2972-5227], Kang, Jae H [0000-0003-4812-0557], Wilson, James F [0000-0001-5751-9178], Foster, Paul J [0000-0002-4755-177X], Hysi, Pirro G [0000-0001-5752-2510], Hewitt, Alex W [0000-0002-5123-5999], Khor, Chiea Chuen [0000-0002-1128-4729], Pasquale, Louis R [0000-0002-5835-3496], Montgomery, Grant W [0000-0002-4140-8139], Klaver, Caroline CW [0000-0002-2355-5258], Hammond, Christopher J [0000-0002-3227-2620], Wiggs, Janey L [0000-0003-1890-3278], Burdon, Kathryn P [0000-0001-8217-1249], MacGregor, Stuart [0000-0001-6731-8142], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Lumican, Candidate gene, genetic structures, Fibrillin-1, Gene Expression, General Physics and Astronomy, Glaucoma, Genome-wide association study, Sensory disorders Donders Center for Medical Neuroscience [Radboudumc 12], Corneal Diseases, Marfan Syndrome, Cornea, ADAMTS Proteins, 0302 clinical medicine, Myopia, lcsh:Science, Corneal Dystrophies, Hereditary, Genetics, Multidisciplinary, Eye Diseases, Hereditary, Mendelian Randomization Analysis, 3. Good health, medicine.anatomical_structure, Proteoglycans, Decorin, Glaucoma, Open-Angle, Keratoconus, Science, Quantitative Trait Loci, 610 Medicine & health, Biology, Quantitative trait locus, Polymorphism, Single Nucleotide, White People, General Biochemistry, Genetics and Molecular Biology, Transforming Growth Factor beta2, 03 medical and health sciences, All institutes and research themes of the Radboud University Medical Center, Quantitative Trait, Heritable, Asian People, medicine, Humans, CHROMATIN STATES, GENE-EXPRESSION, RISK-FACTOR, MUTATIONS, LUMICAN, MOUSE, KERATOCONUS, DECORIN, POLYMORPHISMS, HERITABILITY, [SDV.MHEP.OS]Life Sciences [q-bio]/Human health and pathology/Sensory Organs, Loeys-Dietz Syndrome, [SDV.GEN.GPO]Life Sciences [q-bio]/Genetics/Populations and Evolution [q-bio.PE], Genome, Human, General Chemistry, medicine.disease, eye diseases, 030104 developmental biology, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, 030221 ophthalmology & optometry, lcsh:Q, Ehlers-Danlos Syndrome, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, sense organs, Genome-Wide Association Study
Abstract: Central corneal thickness (CCT) is a highly heritable trait associated with complex eye diseases such as keratoconus and glaucoma. We perform a genome-wide association meta-analysis of CCT and identify 19 novel regions. In addition to adding support for known connective tissue-related pathways, pathway analyses uncover previously unreported gene sets. Remarkably, >20% of the CCT-loci are near or within Mendelian disorder genes. These included FBN1, ADAMTS2 and TGFB2 which associate with connective tissue disorders (Marfan, Ehlers-Danlos and Loeys-Dietz syndromes), and the LUM-DCN-KERA gene complex involved in myopia, corneal dystrophies and cornea plana. Using index CCT-increasing variants, we find a significant inverse correlation in effect sizes between CCT and keratoconus (r = −0.62, P = 5.30 × 10−5) but not between CCT and primary open-angle glaucoma (r = −0.17, P = 0.2). Our findings provide evidence for shared genetic influences between CCT and keratoconus, and implicate candidate genes acting in collagen and extracellular matrix regulation.
Published: 2018
Full Text: View/download PDF

37. Rare variants of the 3’-5’ DNA exonuclease TREX1 in early onset small vessel stroke

Author: Hugh S. Markus, Cathie Sudlow, Kristiina Rannikmäe, Steven Bevan, David Hunt, Louise S. Bicknell, Clare V. Logan, Alexa Jury, Sarah McGlasson, and Andrew P. Jackson
Subjects: 0301 basic medicine, medicine.medical_specialty, Lacunar stroke, Medicine (miscellaneous), General Biochemistry, Genetics and Molecular Biology, 03 medical and health sciences, 0302 clinical medicine, Internal medicine, Medicine, cardiovascular diseases, Family history, B100 Anatomy, Physiology and Pathology, Stroke, business.industry, Microangiopathy, Odds ratio, medicine.disease, Pathophysiology, Confidence interval, 3. Good health, C431 Medical Genetics, 030104 developmental biology, Cohort, business, Neuroscience, 030217 neurology & neurosurgery
Abstract: Background: Monoallelic and biallelic mutations in the exonuclease TREX1 cause monogenic small vessel diseases (SVD). Given recent evidence for genetic and pathophysiological overlap between monogenic and polygenic forms of SVD, evaluation of TREX1 in small vessel stroke is warranted. Methods: We sequenced the TREX1 gene in an exploratory cohort of patients with lacunar stroke (Edinburgh Stroke Study, n=290 lacunar stroke cases). We subsequently performed a fully blinded case-control study of early onset MRI-confirmed small vessel stroke within the UK Young Lacunar Stroke Resource (990 cases, 939 controls). Results: No patients with canonical disease-causing mutations of TREX1 were identified in cases or controls. Analysis of an exploratory cohort identified a potential association between rare variants of TREX1 and patients with lacunar stroke. However, subsequent controlled and blinded evaluation of TREX1 in a larger and MRI-confirmed patient cohort, the UK Young Lacunar Stroke Resource, identified heterozygous rare variants in 2.1% of cases and 2.3% of controls. No association was observed with stroke risk (odds ratio = 0.90; 95% confidence interval, 0.49-1.65 p=0.74). Similarly no association was seen with rare TREX1 variants with predicted deleterious effects on enzyme function (odds ratio = 1.05; 95% confidence interval, 0.43-2.61 p=0.91). Conclusions: No patients with early-onset lacunar stroke had genetic evidence of a TREX1-associated monogenic microangiopathy. These results show no evidence of association between rare variants of TREX1 and early onset lacunar stroke. This includes rare variants that significantly affect protein and enzyme function. Routine sequencing of the TREX1 gene in patients with early onset lacunar stroke is therefore unlikely to be of diagnostic utility, in the absence of syndromic features or family history.
Published: 2017
Full Text: View/download PDF

38. Branched-chain amino acids and Alzheimer’s disease: a Mendelian randomization analysis

Author: Susanna C. Larsson and Hugh S. Markus
Subjects: 0301 basic medicine, Nucleocytoplasmic Transport Proteins, lcsh:Medicine, Nerve Tissue Proteins, Single-nucleotide polymorphism, Genome-wide association study, Biology, Polymorphism, Single Nucleotide, Article, DEAD-box RNA Helicases, 03 medical and health sciences, 0302 clinical medicine, Alzheimer Disease, Valine, Polymorphism (computer science), Mendelian randomization, Odds Ratio, Genetic predisposition, Humans, Genetic Predisposition to Disease, Isoleucine, Protein Precursors, lcsh:Science, Medicinsk genetik, Genetics, Multidisciplinary, lcsh:R, Genetic Pleiotropy, Mendelian Randomization Analysis, Protein Phosphatase 2C, 030104 developmental biology, lcsh:Q, Medical Genetics, Amino Acids, Branched-Chain, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: We conducted a two-sample Mendelian randomization study to test the hypothesis that raised plasma levels of the branched-chain amino acids isoleucine, leucine, and valine are associated with Alzheimer’s disease (AD). From a genome-wide association study of 16,596 individuals of European ancestry, we obtained summary statistics for four independent single nucleotide polymorphisms (SNPs) associated with isoleucine levels and one SNP associated with both leucine and valine levels at genome-wide significance. Summary statistics of the associations of the five SNPs with AD were obtained from the International Genomics of Alzheimer’s Project (17,008 AD cases and 37,154 controls). Based on four SNPs, the odds ratio of AD per genetically predicted one standard deviation higher isoleucine levels was 1.35 (95% CI, 1.08–1.69; p = 0.007). The leucine- and valine-raising allele was not associated with AD (p = 0.46). These data suggest that a genetic predisposition to raised plasma isoleucine levels is positively associated with AD.
Published: 2017
Full Text: View/download PDF

39. Genetically-Predicted Adult Height and Alzheimer's Disease

Author: Susanna C. Larsson, Hugh S. Markus, Stephen Burgess, and Matthew Traylor
Subjects: 0301 basic medicine, Gerontology, Adult, Male, Body height, Library science, Polymorphism, Single Nucleotide, Article, 03 medical and health sciences, Alzheimer Disease, Risk Factors, Strategic research, Odds Ratio, Humans, Genetic Predisposition to Disease, Erasmus+, Anthropometry, General Neuroscience, General Medicine, University hospital, Control subjects, Adult height, Body Height, Psychiatry and Mental health, Clinical Psychology, 030104 developmental biology, Research centre, Christian ministry, Female, Geriatrics and Gerontology, Psychology, Genome-Wide Association Study
Abstract: This work was supported by a Young Scholar Award (to Susanna C. Larsson) from the Karolinska Institutet’s Strategic Research Program in Epidemiology (SFO-EPI). Hugh S. Markus and Matthew Traylor have infrastructural support from the Cambridge University Trusts NIHR Biomedical Research Centre. Hugh S. Markus is supported by a NIHR Senior Investigator award. The authors thank the International Genomics of Alzheimer’s Project (IGAP) for providing summary-level data for these analyses. The investigators within IGAP contributed to the design and implementation of IGAP and/or provided data but did not participate in analysis or writing of this report. IGAP was made possible by the generous participation of the control subjects, the patients, and their families. The i– Select chips was funded by the French National Foundation on Alzheimer’s disease and related disorders. EADI was supported by the LABEX (laboratory of excellence program investment for the future) DISTALZ grant, Inserm, Institut Pasteur de Lille, Universite de Lille 2 and the Lille University Hospital. GERAD was supported by the Medical Research Council (Grant n° 503480), Alzheimer’s Research UK (Grant n° 503176), the Wellcome Trust (Grant n° 082604/2/07/Z) and German Federal Ministry of Education and Research (BMBF): Competence Network Dementia (CND) grant n° 01GI0102, 01GI0711, 01GI0420. CHARGE was partly supported by the NIH/NIA grant R01 AG033193 and the NIA AG081220 and AGES contract N01–AG–12100, the NHLBI grant R01 HL105756, the Icelandic Heart Association, and the Erasmus Medical Center and Erasmus University. ADGC was supported by the NIH/NIA grants: U01 AG032984, U24 AG021886, U01 AG016976, and the Alzheimer’s Association grant ADGC–10–196728.
Published: 2017

40. Sodium Valproate, a Histone Deacetylase Inhibitor, Is Associated With Reduced Stroke Risk After Previous Ischemic Stroke or Transient Ischemic Attack

Author: Rebecca L. Brookes, Graeme J. Hankey, Hugh S. Markus, Linxin Li, Charles D.A. Wolfe, Siobhan Crichton, Qilong Yi, and Peter M. Rothwell
Subjects: 0301 basic medicine, Male, Original Contributions, Brain Ischemia, survival analysis, Pathogenesis, 0302 clinical medicine, Risk Factors, genetics, Registries, Prospective cohort study, Stroke, Aged, 80 and over, Hazard ratio, Confounding, Middle Aged, stroke, Survival Rate, Cardiology, Anticonvulsants, Female, Cardiology and Cardiovascular Medicine, secondary prevention, medicine.medical_specialty, Clinical Sciences, Disease-Free Survival, Histone Deacetylases, 03 medical and health sciences, Internal medicine, medicine, Humans, Survival analysis, Aged, Advanced and Specialized Nursing, business.industry, Proportional hazards model, Valproic Acid, medicine.disease, Confidence interval, Histone Deacetylase Inhibitors, Repressor Proteins, 030104 developmental biology, histone deacetylase, Neurology (clinical), business, 030217 neurology & neurosurgery, sodium valproate, Follow-Up Studies
Abstract: Background and Purpose— A variant in the histone deacetylase 9 ( HDAC9 ) gene is associated with large artery stroke. Therefore, inhibiting HDAC9 might offer a novel secondary preventative treatment for ischemic stroke. The antiepileptic drug sodium valproate (SVA) is a nonspecific inhibitor of HDAC9. We tested whether SVA therapy given after ischemic stroke was associated with reduced recurrent stroke rate. Methods— Data were pooled from 3 prospective studies recruiting patients with previous stroke or transient ischemic attack and long-term follow-up: the South London Stroke Register, The Vitamins to Prevent Stroke Study, and the Oxford Vascular Study. Patients receiving SVA were compared with patients who received antiepileptic drugs other than SVA using survival analysis and Cox Regression. Results— A total of 11 949 patients with confirmed ischemic event were included. Recurrent stroke rate was lower in patient taking SVA (17 of 168) than other antiepileptic drugs (105 of 530; log-rank survival analysis P =0.002). On Cox regression, controlling for potential cofounders, SVA remained associated with reduced stroke (hazard ratio=0.44; 95% confidence interval: 0.3–0.7; P =0.002). A similar result was obtained when patients taking SVA were compared with all cases not taking SVA (Cox regression, hazard ratio=0.47; 95% confidence interval: 0.29–0.77; P =0.003). Conclusions— These results suggest that exposure to SVA, an inhibitor of HDAC, may be associated with a lower recurrent stroke risk although we cannot exclude residual confounding in this study design. This supports the hypothesis that HDAC9 is important in the ischemic stroke pathogenesis and that its inhibition, by SVA or a more specific HDAC9 inhibitor, is worthy of evaluation as a treatment to prevent recurrent ischemic stroke.
Published: 2017

41. Genetic variants influencing elevated myeloperoxidase levels increase risk of stroke

Author: Israel Fernandez-Cadenas, Chia-Ling Phuah, Jeremiasz M. Jagiella, Agnieszka Slowik, Steven M. Greenberg, Tushar Dave, Joshua N. Goldstein, Bo Norrving, Miriam R. Raffeld, Christopher D. Anderson, Jaume Roquer, Natalia S. Rost, Anand Viswanathan, Arne Lindgren, Alexander Pichler, Joan Montaner, Daniel Woo, Braxton D. Mitchell, Carl D. Langefeld, Alessandro Biffi, Jordi Jimenez-Conde, Rainer Malik, Reinhold Schmidt, Alison M. Ayres, Martin Dichgans, Björn M. Hansen, B. B. Worrall, Steven J. Kittner, Christian Enzinger, Jonathan Rosand, and Hugh S. Markus
Subjects: 0301 basic medicine, Oncology, Male, medicine.medical_specialty, Lacunar stroke, genetics [Cerebral Hemorrhage], statistics & numerical data [Databases, Factual], Databases, Factual, metabolism [Peroxidase], Disease, Statistics, Nonparametric, Cohort Studies, 03 medical and health sciences, 0302 clinical medicine, Risk Factors, Internal medicine, medicine, Humans, complications [Stroke], ddc:610, Prospective cohort study, Stroke, Aged, Cerebral Hemorrhage, Peroxidase, Aged, 80 and over, biology, Proportional hazards model, business.industry, Odds ratio, Original Articles, Middle Aged, medicine.disease, etiology [Cerebral Hemorrhage], 3. Good health, 030104 developmental biology, Myeloperoxidase, Case-Control Studies, Cohort, biology.protein, cardiovascular system, Female, Neurology (clinical), business, 030217 neurology & neurosurgery, genetics [Peroxidase], Genome-Wide Association Study
Abstract: Primary intracerebral haemorrhage and lacunar ischaemic stroke are acute manifestations of progressive cerebral microvascular disease. Current paradigms suggest atherosclerosis is a chronic, dynamic, inflammatory condition precipitated in response to endothelial injury from various environmental challenges. Myeloperoxidase plays a central role in initiation and progression of vascular inflammation, but prior studies linking myeloperoxidase with stroke risk have been inconclusive. We hypothesized that genetic determinants of myeloperoxidase levels influence the development of vascular instability, leading to increased primary intracerebral haemorrhage and lacunar stroke risk. We used a discovery cohort of 1409 primary intracerebral haemorrhage cases and 1624 controls from three studies, an extension cohort of 12 577 ischaemic stroke cases and 25 643 controls from NINDSSiGN, and a validation cohort of 10 307 ischaemic stroke cases and 29 326 controls from METASTROKE Consortium with genome-wide genotyping to test this hypothesis. A genetic risk score reflecting elevated myeloperoxidase levels was constructed from 15 common single nucleotide polymorphisms identified from prior genome-wide studies of circulating myeloperoxidase levels (P55 - 10 6). This genetic risk score was used as the independent variable in multivariable regression models for association with primary intracerebral haemorrhage and ischaemic stroke subtypes. We used fixed effects meta-analyses to pool estimates across studies. We also used Cox regression models in a prospective cohort of 174 primary intracerebral haemorrhage survivors for association with intracerebral haemorrhage recurrence. We present effects of myeloperoxidase elevating single nucleotide polymorphisms on stroke risk per risk allele, corresponding to a one allele increase in the myeloperoxidase increasing genetic risk score. Genetic determinants of elevated circulating myeloperoxidase levels were associated with both primary intracerebral haemorrhage risk (odds ratio, 1.07, P = 0.04) and recurrent intracerebral haemorrhage risk (hazards ratio, 1.45, P = 0.006). In analysis of ischaemic stroke subtypes, the myeloperoxidase increasing genetic risk score was strongly associated with lacunar subtype only (odds ratio, 1.05, P = 0.0012). These results, demonstrating that common genetic variants that increase myeloperoxidase levels increase risk of primary intracerebral haemorrhage and lacunar stroke, directly implicate the myeloperoxidase pathway in the pathogenesis of cerebral small vessel disease. Because genetic variants are not influenced by environmental exposures, these results provide new support for a causal rather than bystander role for myeloperoxidase in the progression of cerebrovascular disease. Furthermore, these results support a rationale for chronic inflammation as a potential modifiable stroke risk mechanism, and suggest that immune-targeted therapies could be useful for treatment and prevention of cerebrovascular disease. (Less)
Published: 2017
Full Text: View/download PDF

42. Common coding variant in SERPINA1 increases the risk for large artery stroke

Author: Martina Müller-Nurasyid, Hugh S. Markus, Daniel Deredge, Peter Lichtner, Dieter E. Jenne, Patrick L. Wintrode, Klaus Berger, Rainer Malik, Cathie Sudlow, Gerard Pasterkamp, Martin Dichgans, Danish Saleheen, Evgeniia V. Edeleva, Therese Dau, Jens Minnerup, Sander W. van der Laan, Maria Gonik, Lisa F. Lincz, Annette I. Burgess, Dieter Braun, Jessica Götzfried, Melanie Waldenberger, John Attia, Christopher Levi, Peter M. Rothwell, Jennifer Kriebel, Kristiina Rannikmäe, Anirudh Sivakumar, Nathalie Beaufort, Susana Seixas, Steve Bevan, and Elizabeth G. Holliday
Subjects: 0301 basic medicine, Nonsynonymous substitution, medicine.medical_specialty, Proteases, large artery stroke, Serpin, Biology, 03 medical and health sciences, Internal medicine, medicine, ischemic stroke, Journal Article, genetics, antitrypsin, C440 Molecular Genetics, Reactive center, Genetic association, Genetics, Antitrypsin, Ischemic Stroke, Large Artery Stroke, Variation, Multidisciplinary, Elastase, HDAC9, C420 Human Genetics, C431 Medical Genetics, 030104 developmental biology, Endocrinology, C400 Genetics, variation, Lipoprotein
Abstract: Large artery atherosclerotic stroke (LAS) shows substantial heritability not explained by previous genome-wide association studies. Here, we explore the role of coding variation in LAS by analyzing variants on the HumanExome BeadChip in a total of 3,127 cases and 9,778 controls from Europe, Australia, and South Asia. We report on a nonsynonymous single-nucleotide variant in serpin family A member 1 (SERPINA1) encoding alpha-1 antitrypsin [AAT; p.V213A; P = 5.99E-9, odds ratio (OR) = 1.22] and confirm histone deacetylase 9 (HDAC9) as a major risk gene for LAS with an association in the 3'-UTR (rs2023938; P = 7.76E-7, OR = 1.28). Using quantitative microscale thermophoresis, we show that M1 (A213) exhibits an almost twofold lower dissociation constant with its primary target human neutrophil elastase (NE) in lipoprotein-containing plasma, but not in lipid-free plasma. Hydrogen/deuterium exchange combined with mass spectrometry further revealed a significant difference in the global flexibility of the two variants. The observed stronger interaction with lipoproteins in plasma and reduced global flexibility of the Val-213 variant most likely improve its local availability and reduce the extent of proteolytic inactivation by other proteases in atherosclerotic plaques. Our results indicate that the interplay between AAT, NE, and lipoprotein particles is modulated by the gate region around position 213 in AAT, far away from the unaltered reactive center loop (357-360). Collectively, our findings point to a functionally relevant balance between lipoproteins, proteases, and AAT in atherosclerosis.
Published: 2017
Full Text: View/download PDF

43. New insights into mechanisms of small vessel disease stroke from genetics

Author: Rhea Tan, Matthew Traylor, Hugh S. Markus, Loes C.A. Rutten-Jacobs, Traylor, Matthew [0000-0001-6624-8621], Jacobs, Loes [0000-0003-3223-885X], Markus, Hugh [0000-0002-9794-5996], and Apollo - University of Cambridge Repository
Subjects: 0301 basic medicine, Pathology, medicine.medical_specialty, Lacunar stroke, Genome-wide association study, CADASIL, Disease, Biology, Leukoencephalopathy, 03 medical and health sciences, 0302 clinical medicine, Leukoencephalopathies, medicine, Humans, genetics, Genetic Predisposition to Disease, Vascular dementia, cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), Genetic association, Extracellular Matrix Proteins, matrisome, cerebral small vessel disease, Cerebral infarction, lacunar stroke, Alopecia, General Medicine, Cerebral Infarction, medicine.disease, Extracellular Matrix, 030104 developmental biology, Blood-Brain Barrier, Cerebral Small Vessel Diseases, Spinal Diseases, Collagen, Neuroscience, 030217 neurology & neurosurgery
Abstract: Cerebral small vessel disease (SVD) is a common cause of lacunar strokes, vascular cognitive impairment (VCI) and vascular dementia. SVD is thought to result in reduced cerebral blood flow, impaired cerebral autoregulation and increased blood–brain barrier (BBB) permeability. However, the molecular mechanisms underlying SVD are incompletely understood. Recent studies in monogenic forms of SVD, such as cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL), and ‘sporadic’ SVD have shed light on possible disease mechanisms in SVD. Proteomic and biochemical studies in post-mortem monogenic SVD patients, as well as in animal models of monogenic disease have suggested that disease pathways are shared between different types of monogenic disease, often involving the impairment of extracellular matrix (ECM) function. In addition, genetic studies in ‘sporadic’ SVD have also shown that the disease is highly heritable, particularly among young-onset stroke patients, and that common variants in monogenic disease genes may contribute to disease processes in some SVD subtypes. Genetic studies in sporadic lacunar stroke patients have also suggested distinct genetic mechanisms between subtypes of SVD. Genome-wide association studies (GWAS) have also shed light on other potential disease mechanisms that may be shared with other diseases involving the white matter, or with pathways implicated in monogenic disease. This review brings together recent data from studies in monogenic SVD and genetic studies in ‘sporadic’ SVD. It aims to show how these provide new insights into the pathogenesis of SVD, and highlights the possible convergence of disease mechanisms in monogenic and sporadic SVD.
Published: 2016

44. Impact of intravenous heparin on quantification of circulating microRNAs in patients with coronary artery disease

Author: Peter Willeit, Robert F. Storey, Dorothee Kaudewitz, Reuben McGregor, Manuel Mayr, Keith M. Channon, Regent Lee, Anna Zampetaki, Hugh S. Markus, and Stefan Kiechl
Subjects: 0301 basic medicine, Blood Platelets, Male, medicine.medical_specialty, Pathology, Time Factors, medicine.medical_treatment, Myocardial Infarction, Coronary Artery Disease, 030204 cardiovascular system & hematology, Coronary Angiography, Polymerase Chain Reaction, Coronary artery disease, Cohort Studies, 03 medical and health sciences, 0302 clinical medicine, Bolus (medicine), Internal medicine, microRNA, medicine, Animals, Humans, Dosing, Caenorhabditis elegans, Aged, business.industry, Heparin, Percutaneous coronary intervention, Anticoagulants, Hematology, Middle Aged, medicine.disease, Circulating MicroRNA, MicroRNAs, 030104 developmental biology, Injections, Intravenous, Cardiology, Female, business, Platelet Aggregation Inhibitors, medicine.drug, Blood sampling
Abstract: SummaryMicroRNAs are small non-coding RNAs that are detectable in plasma and serum. Circulating levels of microRNAs have been measured in various studies related to cardiovascular disease. Heparin is a potential confounder of microRNA measurements due to its known interference with polymerase chain reactions. In this study, platelet-poor plasma was obtained from patients undergoing cardiac catheterisation for diagnostic coronary angiography, or for percutaneous coronary intervention, both before and after heparin administration. Heparin had pronounced effects on the assessment of the exogenous C. elegans spike-in control (decrease by approx. 3 cycles), which disappeared 6 hours after the heparin bolus. Measurements of endogenous microRNAs were less sensitive to heparin medication. Normalisation of individual microRNAs with the average cycle threshold value of all microRNAs provided a suitable alternative to normalisation with exogenous C. elegans spike-in control in this setting. Thus, both the timing of blood sampling relative to heparin dosing and the normalisation procedure are critical for reliable microRNA measurements in patients receiving intravenous heparin. This has to be taken into account when designing studies to investigate the relation of circulating microRNAs to acute cardiovascular events or coronary intervention.
Published: 2016
Full Text: View/download PDF

45. Human validation of genes associated with a murine atherosclerotic phenotype

Author: Martin Dichgans, Hugh S. Markus, Imo E. Hoefer, Tim Bezemer, Gerard Pasterkamp, Folkert W. Asselbergs, Hester M. den Ruijter, Jessica van Setten, Rainer Malik, Sander W. van der Laan, Hassan Foroughi Asl, Marten A. Siemelink, Saskia Haitjema, Nilesh J. Samani, Johan Björkegren, Saskia C.A. de Jager, Heribert Schunkert, Bradford B. Worrall, Tom Michoel, and Dominique P V de Kleijn
Subjects: 0301 basic medicine, Genetically modified mouse, Genetic Markers, Pathology, medicine.medical_specialty, mice, Quantitative Trait Loci, Genome-wide association study, Review, 030204 cardiovascular system & hematology, Quantitative trait locus, Polymorphism, Single Nucleotide, Risk Assessment, Coronary artery disease, 03 medical and health sciences, 0302 clinical medicine, Species Specificity, Risk Factors, Databases, Genetic, Journal Article, Medicine, Animals, Humans, Gene Regulatory Networks, Genetic Predisposition to Disease, Genetic association, genome-wide association study, business.industry, Gene Expression Profiling, Computational Biology, Reproducibility of Results, medicine.disease, Intracranial Arteriosclerosis, Phenotype, stroke, Plaque, Atherosclerotic, Gene expression profiling, Disease Models, Animal, 030104 developmental biology, Gene Expression Regulation, Expression quantitative trait loci, atherosclerosis, business, Cardiology and Cardiovascular Medicine, coronary artery disease
Abstract: Objective— The genetically modified mouse is the most commonly used animal model for studying the pathogenesis of atherosclerotic disease. We aimed to assess if mice atherosclerosis-related genes could be validated in human disease through examination of results from genome-wide association studies. Approach and Results— We performed a systematic review to identify atherosclerosis-causing genes in mice and carried out gene-based association tests of their human orthologs for an association with human coronary artery disease and human large artery ischemic stroke. Moreover, we investigated the association of these genes with human atherosclerotic plaque characteristics. In addition, we assessed the presence of tissue-specific cis -acting expression quantitative trait loci for these genes in humans. Finally, using pathway analyses we show that the putative atherosclerosis-causing genes revealed few associations with human coronary artery disease, large artery ischemic stroke, or atherosclerotic plaque characteristics, despite the fact that the majority of these genes have cis -acting expression quantitative trait loci. Conclusions— A role for genes that has been observed in mice for atherosclerotic lesion development could scarcely be confirmed by studying associations of disease development with common human genetic variants. The value of murine atherosclerotic models for selection of therapeutic targets in human disease remains unclear.
Published: 2016
Full Text: View/download PDF

46. Associations of functional alanine-glyoxylate aminotransferase 2 gene variants with atrial fibrillation and ischemic stroke

Author: Kari-Matti Mäkelä, Mika Kähönen, Steve Bevan, Jussi Hernesniemi, Hugh S. Markus, Tuomas Koskinen, Efthymia Vlachopoulou, Martin Dichgans, Nina Mononen, Catherine Sudlow, Leo-Pekka Lyytikäinen, Winfried März, Ilkka Seppälä, Peter M. Rothwell, Graciela Delgado, Reijo Laaksonen, Marcus E. Kleber, Juha Sinisalo, Hubert Scharnagl, Terho Lehtimäki, Niku Oksala, Transplantation Laboratory, Medicum, Clinicum, University of Helsinki, Department of Medicine, and Kardiologian yksikkö
Subjects: Male, 0301 basic medicine, Pathology, Heart disease, BLOOD-PRESSURE, Genome-wide association study, 030204 cardiovascular system & hematology, Cohort Studies, 0302 clinical medicine, Atrial Fibrillation, Odds Ratio, OXIDATIVE STRESS, Stroke, POPULATION, ASYMMETRIC DIMETHYLARGININE, education.field_of_study, Multidisciplinary, Angiography, Atrial fibrillation, Middle Aged, Coronary Vessels, 3. Good health, Cohort, Cardiology, Female, medicine.medical_specialty, Genotype, Population, Mutation, Missense, Polymorphism, Single Nucleotide, Article, 03 medical and health sciences, Internal medicine, medicine, Humans, SYMMETRIC DIMETHYLARGININE, GENOME-WIDE ASSOCIATION, education, METAANALYSIS, Alleles, Transaminases, Aged, NITRIC-OXIDE, business.industry, MORTALITY, Case-control study, Odds ratio, ta3121, medicine.disease, ADMA, Logistic Models, 030104 developmental biology, 3121 General medicine, internal medicine and other clinical medicine, Case-Control Studies, Chronic Disease, C400 Genetics, business
Abstract: Asymmetric and symmetric dimethylarginines (ADMA and SDMA) impair nitric oxide bioavailability and have been implicated in the pathogenesis of atrial fibrillation (AF). Alanine–glyoxylate aminotransferase 2 (AGXT2) is the only enzyme capable of metabolizing both of the dimethylarginines. We hypothesized that two functional AGXT2 missense variants (rs37369, V140I; rs16899974, V498L) are associated with AF and its cardioembolic complications. Association analyses were conducted using 1,834 individulas with AF and 7,159 unaffected individuals from two coronary angiography cohorts and a cohort comprising patients undergoing clinical exercise testing. In coronary angiography patients without structural heart disease, the minor A allele of rs16899974 was associated with any AF (OR = 2.07, 95% CI 1.59-2.68) and with paroxysmal AF (OR = 1.98, 95% CI 1.44–2.74) and chronic AF (OR = 2.03, 95% CI 1.35–3.06) separately. We could not replicate the association with AF in the other two cohorts. However, the A allele of rs16899974 was nominally associated with ischemic stroke risk in the meta-analysis of WTCCC2 ischemic stroke cohorts (3,548 cases, 5,972 controls) and with earlier onset of first-ever ischemic stroke (360 cases) in the cohort of clinical exercise test patients. In conclusion, AGXT2 variations may be involved in the pathogenesis of AF and its age-related thromboembolic complications.
Published: 2016
Full Text: View/download PDF

47. Cerebral small vessel disease: capillary pathways to stroke and cognitive decline

Author: Turgay Dalkara, Keith W. Muir, Leif Østergaard, Joanna M. Wardlaw, M. Hansen, Hugh S. Markus, Fiona Moreton, Thorbjørn S Engedal, and Nöroloji
Subjects: 0301 basic medicine, medicine.medical_specialty, Pathology, Blood viscosity, Cerebral small vessel disease, Disease, 03 medical and health sciences, 0302 clinical medicine, Diabetes mellitus, Internal medicine, medicine, Dementia, Humans, Cognitive decline, Stroke, Review Articles, business.industry, Neurodegeneration, capillary dysfunction, medicine.disease, 3. Good health, Capillaries, 030104 developmental biology, Neurology, Cerebral Small Vessel Diseases, Cardiology, Disease Progression, Neurology (clinical), Small vessel, oxygenation, Cardiology and Cardiovascular Medicine, business, Cognition Disorders, 030217 neurology & neurosurgery, dementia
Abstract: Cerebral small vessel disease (SVD) gives rise to one in five strokes worldwide and constitutes a major source of cognitive decline in the elderly. SVD is known to occur in relation to hypertension, diabetes, smoking, radiation therapy and in a range of inherited and genetic disorders, autoimmune disorders, connective tissue disorders, and infections. Until recently, changes in capillary patency and blood viscosity have received little attention in the aetiopathogenesis of SVD and the high risk of subsequent stroke and cognitive decline. Capillary flow patterns were, however, recently shown to limit the extraction efficacy of oxygen in tissue and capillary dysfunction therefore proposed as a source of stroke-like symptoms and neurodegeneration, even in the absence of physical flow-limiting vascular pathology. In this review, we examine whether capillary flow disturbances may be a shared feature of conditions that represent risk factors for SVD. We then discuss aspects of capillary dysfunction that could be prevented or alleviated and therefore might be of general benefit to patients at risk of SVD, stroke or cognitive decline.
Published: 2016
Full Text: View/download PDF

48. APOE 2 is associated with white matter hyperintensity volume in CADASIL

Author: Francesca Pescini, Benno Gesierich, Maria Teresa Dotti, Elles M. J. Boon, Jonathan Rosand, Mariya Gonik, Leonardo Pantoni, Steve Bevan, Jeroen van der Grond, Michael Ewers, Elisabeth Tournier-Lasserve, Michele Ragno, Martin Dichgans, Nicola De Stefano, Marco Duering, Christian Opherk, Eric Jouvent, Luigi Pianese, Hugh S. Markus, Natalia S. Rost, Saskia A J Lesnik Oberstein, Dominique Hervé, Poneh Adib-Samii, Hugues Chabriat, Rainer Malik, Serena Silvestri, Antonio Federico, and Human genetics
Subjects: 0301 basic medicine, Apolipoprotein E, Adult, Male, Pathology, medicine.medical_specialty, small vessel disease, Genotype, Apolipoprotein E2, CADASIL, Brief Communication, Polymorphism, Single Nucleotide, Angiopathy, White matter, Leukoencephalopathy, 03 medical and health sciences, 0302 clinical medicine, Gene Frequency, Risk Factors, medicine, Humans, Protein Isoforms, Allele frequency, Alleles, business.industry, Middle Aged, white matter hyperintensities, medicine.disease, Magnetic Resonance Imaging, White Matter, Hyperintensity, 030104 developmental biology, medicine.anatomical_structure, multicenter study, Neurology, Regression Analysis, Female, lipids (amino acids, peptides, and proteins), Neurology (clinical), Cerebral amyloid angiopathy, Cardiology and Cardiovascular Medicine, business, 030217 neurology & neurosurgery, APOE, Genome-Wide Association Study
Abstract: Apolipoprotein E ( APOE) increases the risk for Alzheimer’s disease ( ɛ4 allele) and cerebral amyloid angiopathy ( ɛ2 and ɛ4), but its role in small vessel disease (SVD) is debated. Here we studied the effects of APOE on white matter hyperintensity volume (WMHV) in CADASIL (cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy), a nonamyloidogenic angiopathy and inherited early-onset form of pure SVD. Four hundred and eighty-eight subjects were recruited through a multicenter consortium. Compared with APOE ɛ3/ ɛ3, WMHV was increased in APOE ɛ2 ( P = 0.02) but not APOE ɛ4. The results remained significant when controlled for genome-wide genetic background variation. Our findings suggest a modifying influence of APOE ɛ2 on WMHV caused by pure SVD.
Published: 2016
Full Text: View/download PDF

49. Consensus statement for diagnosis of subcortical small vessel disease

Author: Marco Duering, Gary A. Rosenberg, Reinhold Schmidt, Anne Joutel, Costantino Iadecola, Martin Dichgans, Vladimir Hachinski, Joanna M. Wardlaw, Hugh S. Markus, Amos D. Korczyn, Anders Wallin, Lea T. Grinberg, Leslie Wolfson, Joan Montaner, Berislav V. Zlokovic, and Helena C. Chui
Subjects: 0301 basic medicine, Pathology, medicine.medical_specialty, Aging, Vascular permeability, Disease, Blood–brain barrier, White matter, Capillary Permeability, 03 medical and health sciences, SMALL VESSEL DISEASE, 0302 clinical medicine, medicine, Dementia, Humans, Review Articles, Vascular disease, business.industry, Dementia, Vascular, Leukoaraiosis, medicine.disease, Binswanger's disease, subcortical, 030104 developmental biology, medicine.anatomical_structure, Neurology, Blood-Brain Barrier, Microvessels, Neurology (clinical), SVD, Cardiology and Cardiovascular Medicine, business, 030217 neurology & neurosurgery
Abstract: Vascular cognitive impairment (VCI) is the diagnostic term used to describe a heterogeneous group of sporadic and hereditary diseases of the large and small blood vessels. Subcortical small vessel disease (SVD) leads to lacunar infarcts and progressive damage to the white matter. Patients with progressive damage to the white matter, referred to as Binswanger’s disease (BD), constitute a spectrum from pure vascular disease to a mixture with neurodegenerative changes. Binswanger’s disease patients are a relatively homogeneous subgroup with hypoxic hypoperfusion, lacunar infarcts, and inflammation that act synergistically to disrupt the blood–brain barrier (BBB) and break down myelin. Identification of this subgroup can be facilitated by multimodal disease markers obtained from clinical, cerebrospinal fluid, neuropsychological, and imaging studies. This consensus statement identifies a potential set of biomarkers based on underlying pathologic changes that could facilitate diagnosis and aid patient selection for future collaborative treatment trials.
Published: 2016
Full Text: View/download PDF

50. Structural network efficiency predicts conversion to dementia

Author: Loes C.A. Rutten-Jacobs, Karlijn F. de Laat, Hugh S. Markus, David G. Norris, Helena M. van der Holst, Frank-Erik de Leeuw, Andrew J. Lawrence, Roy P. C. Kessels, Jurgen A.H.R. Claassen, Ingeborg W.M. van Uden, Ewoud J. van Dijk, Anouk G.W. van Norden, Anil M. Tuladhar, and Magnetic Detection and Imaging
Subjects: 0301 basic medicine, Male, medicine.medical_specialty, Alzheimer`s disease Donders Center for Medical Neuroscience [Radboudumc 1], Medizin, Cohort Studies, 03 medical and health sciences, 0302 clinical medicine, Physical medicine and rehabilitation, Predictive Value of Tests, medicine, Dementia, Humans, Longitudinal Studies, Prospective Studies, Prospective cohort study, Psychiatry, Aged, Aged, 80 and over, Neuro- en revalidatiepsychologie, Hazard ratio, Neuropsychology and rehabilitation psychology, METIS-317793, Plasticity and Memory [DI-BCB_DCC_Theme 3], Middle Aged, medicine.disease, Disorders of movement Donders Center for Medical Neuroscience [Radboudumc 3], 22/4 OA procedure, Hyperintensity, 030104 developmental biology, Cerebral Small Vessel Diseases, Cohort, Female, Neurology (clinical), Nerve Net, Psychology, 030217 neurology & neurosurgery, Diffusion MRI, Cohort study, Tractography, Follow-Up Studies
Abstract: Contains fulltext : 168158.pdf (Publisher’s version ) (Closed access) OBJECTIVE: To examine whether structural network connectivity at baseline predicts incident all-cause dementia in a prospective hospital-based cohort of elderly participants with MRI evidence of small vessel disease (SVD). METHODS: A total of 436 participants from the Radboud University Nijmegen Diffusion Tensor and Magnetic Resonance Cohort (RUN DMC), a prospective hospital-based cohort of elderly without dementia with cerebral SVD, were included in 2006. During follow-up (2011-2012), dementia was diagnosed. The structural network was constructed from baseline diffusion tensor imaging followed by deterministic tractography and measures of efficiency using graph theory were calculated. Cox proportional regression analyses were conducted. RESULTS: During 5 years of follow-up, 32 patients developed dementia. MRI markers for SVD were strongly associated with network measures. Patients with dementia showed lower total network strength and global and local efficiency at baseline as compared with the group without dementia. Lower global network efficiency was independently associated with increased risk of incident all-cause dementia (hazard ratio 0.63, 95% confidence interval 0.42-0.96, p = 0.032); in contrast, individual SVD markers including lacunes, white matter hyperintensities volume, and atrophy were not independently associated. CONCLUSIONS: These results support a role of network disruption playing a pivotal role in the genesis of dementia in SVD, and suggest network analysis of the connectivity of white matter has potential as a predictive marker in the disease. 8 p.
Published: 2016
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Journal

Database

Publisher

55 results on '"Hugh S Markus"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources