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1. Schimke immunoosseous dysplasia: an ultra-rare disease. a 20-year case series from the tertiary hospital in the Czech Republic

Author

Jakub Zieg, Martin Bezdíčka, Michaela Němčíková, Miroslava Balaščáková, Martina Suková, Katalin Štěrbová, Karel Vondrák, Jiří Dušek, and Anna Křepelová

Subjects
Schimke immunoosseous dysplasia, Case series, Nephropathy, Chronic kidney disease, Transient ischemic attacks, Transplantation, Pediatrics, RJ1-570
Abstract

Abstract Background Schimke immunoosseous dysplasia (SIOD) is an ultra-rare inherited disease affecting many organ systems. Spondyloepiphyseal dysplasia, T-cell immunodeficiency and steroid resistant nephrotic syndrome are the main symptoms of this disease. Case presentation We aimed to characterize the clinical, pathological and genetic features of SIOD patients received at tertiary Pediatric Nephrology Center, University Hospital Motol, Prague, Czech Republic during the period 2001–2021. The mean age at diagnosis was 21 months (range 18–48 months). All patients presented with growth failure, nephropathy and immunodeficiency. Infections and neurologic complications were present in most of the affected children during the course of the disease. Conclusions Although SIOD is a disease characterized by specific features, the individual phenotype may differ. Neurologic signs can severely affect the quality of life; the view on the management of SIOD is not uniform. Currently, new therapeutic methods are required.

Published
2023
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2. Detection rate of causal variants in severe childhood epilepsy is highest in patients with seizure onset within the first four weeks of life

Author

David Staněk, Petra Laššuthová, Katalin Štěrbová, Markéta Vlčková, Jana Neupauerová, Marcela Krůtová, and Pavel Seeman

Subjects
Epilepsy, Epileptic encephalopathy, Targeted gene panel testing, MPS, Phenotype, KCNQ2, Medicine
Abstract

Abstract Background Epilepsy is a heterogeneous disease with a broad phenotypic spectrum and diverse genotypes. A significant proportion of epilepsies has a genetic aetiology. In our study, a custom designed gene panel with 112 genes known to be associated with epilepsies was used. In total, one hundred and fifty-one patients were tested (86 males / 65 females). Results In our cohort, the highest probability for the identification of the cause of the disease was for patients with a seizure onset within the first four weeks of life (61.9% clarification rate) – about two times more than other groups. The level of statistical significance was determined using a chi-square analysis. From 112 genes included in the panel, suspicious and rare variants were found in 53 genes (47.3%). Among the 151 probands included in the study we identified pathogenic variants in 39 patients (25.8%), likely pathogenic variants in three patients (2%), variants of uncertain significance in 40 patients (26.5%) and likely benign variants in 69 patients (45.7%). Conclusion Our report shows the utility of diagnostic genetic testing of severe childhood epilepsies in a large cohort of patients with a diagnostic rate of 25.8%. A gene panel can be considered as a method of choice for the detection of pathogenic variants within patients with unknown origin of early onset severe epilepsy.

Published
2018
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4. Neurodevelopmental and Epilepsy Phenotypes in Individuals With Missense Variants in the Voltage-Sensing and Pore Domains ofKCNH5

Author

Hannah C. Happ, Lynette G. Sadleir, Matthew Zemel, Guillem de Valles-Ibáñez, Michael S. Hildebrand, Allyn McConkie-Rosell, Marie McDonald, Halie May, Tristan Sands, Vimla Aggarwal, Christopher Elder, Timothy Feyma, Allan Bayat, Rikke S. Møller, Christina D. Fenger, Jens Erik Klint Nielsen, Anita N. Datta, Kathleen M. Gorman, Mary D. King, Natalia D. Linhares, Barbara K. Burton, Andrea Paras, Sian Ellard, Julia Rankin, Anju Shukla, Purvi Majethia, Rory J. Olson, Karthik Muthusamy, Lisa A. Schimmenti, Keith Starnes, Lucie Sedláčková, Katalin Štěrbová, Markéta Vlčková, Petra Laššuthová, Alena Jahodová, Brenda E. Porter, Nathalie Couque, Estelle Colin, Clément Prouteau, Corinne Collet, Thomas Smol, Roseline Caumes, Fleur Vansenne, Francesca Bisulli, Laura Licchetta, Richard Person, Erin Torti, Kirsty McWalter, Richard Webster, Elizabeth E. Gerard, Gaetan Lesca, Pierre Szepetowski, Ingrid E. Scheffer, Heather C. Mefford, Gemma L. Carvill, University of Otago [Dunedin, Nouvelle-Zélande], University of Washington [Seattle], Epilepsy Research Centre, University of Melbourne, Duke University Medical Center, Institute for Genomic Medicine [New York, NY, USA], Columbia University [New York], Columbia University Irving Medical Center (CUIMC), University of Southern Denmark (SDU), Zealand University Hospital [Roskilde, Denmark], University of British Columbia [Vancouver], University College Dublin [Dublin] (UCD), Kasturba Medical College, Manipal, Center for Individualized Medicine, Stanford University School of Medicine [CA, USA], Service de génétique [Angers], Université d'Angers (UA)-Centre Hospitalier Universitaire d'Angers (CHU Angers), PRES Université Nantes Angers Le Mans (UNAM)-PRES Université Nantes Angers Le Mans (UNAM), Institut de Génétique Médicale [CHRU Lille], Hôpital Jeanne de Flandre [Lille]-Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), University of Bologna/Università di Bologna, GeneDx [Gaithersburg, MD, USA], Institut de Neurobiologie de la Méditerranée [Aix-Marseille Université] (INMED - INSERM U1249), and Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
[SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Neurology (clinical), Research Article
Abstract

Background and ObjectivesKCNH5encodes the voltage-gated potassium channel EAG2/Kv10.2. We aimed to delineate the neurodevelopmental and epilepsy phenotypic spectrum associated with de novoKCNH5variants.MethodsWe screened 893 individuals with developmental and epileptic encephalopathies forKCNH5variants using targeted or exome sequencing. Additional individuals withKCNH5variants were identified through an international collaboration. Clinical history, EEG, and imaging data were analyzed; seizure types and epilepsy syndromes were classified. We included 3 previously published individuals including additional phenotypic details.ResultsWe report a cohort of 17 patients, including 9 with a recurrent de novo missense variant p.Arg327His, 4 with a recurrent missense variant p.Arg333His, and 4 additional novel missense variants. All variants were located in or near the functionally critical voltage-sensing or pore domains, absent in the general population, and classified as pathogenic or likely pathogenic using the American College of Medical Genetics and Genomics criteria. All individuals presented with epilepsy with a median seizure onset at 6 months. They had a wide range of seizure types, including focal and generalized seizures. Cognitive outcomes ranged from normal intellect to profound impairment. Individuals with the recurrent p.Arg333His variant had a self-limited drug-responsive focal or generalized epilepsy and normal intellect, whereas the recurrent p.Arg327His variant was associated with infantile-onset DEE. Two individuals with variants in the pore domain were more severely affected, with a neonatal-onset movement disorder, early-infantile DEE, profound disability, and childhood death.DiscussionWe describe a cohort of 17 individuals with pathogenic or likely pathogenic missense variants in the voltage-sensing and pore domains of Kv10.2, including 14 previously unreported individuals. We present evidence for a putative emerging genotype-phenotype correlation with a spectrum of epilepsy and cognitive outcomes. Overall, we expand the role of EAG proteins in human disease and establishKCNH5as implicated in a spectrum of neurodevelopmental disorders and epilepsy.

Published
2022
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5. Missense variants in the voltage sensing and pore domain of KCNH5 cause neurodevelopmental phenotypes including epilepsy

Author

Hannah C. Happ, Lynette G. Sadleir, Matthew Zemel, Guillem de Valles-Ibáñez, Michael S. Hildebrand, Allyn McConkie-Rosell, Marie McDonald, Halie May, Tristan Sands, Vimla Aggarwal, Christopher Elder, Timothy Feyma, Allan Bayat, Rikke S. Møller, Christina D. Fenger, Jens Erik Klint Nielsen, Anita N. Datta, Kathleen M. Gorman, Mary D. King, Natalia Linhares, Barbara K. Burton, Andrea Paras, Sian Ellard, Julia Rankin, Anju Shukla, Purvi Majethia, Rory J. Olson, Karthik Muthusamy, Lisa A Schimmenti, Keith Starnes, Lucie Sedláčková, Katalin Štěrbová, Markéta Vlčková, Petra Laššuthová, Alena Jahodová, Brenda E. Porter, Nathalie Couque, Estelle Colin, Clément Prouteau, Corinne Collet, Thomas Smol, Roseline Caumes, Fleur Vansenne, Francesca Bisulli, Laura Licchetta, Richard Person, Erin Torti, Kirsty McWalter, Richard Webster, Gaetan Lesca, Pierre Szepetowski, Ingrid E. Scheffer, Heather C. Mefford, Gemma L. Carvill, Institut de Neurobiologie de la Méditerranée [Aix-Marseille Université] (INMED - INSERM U1249), and Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
[SDV]Life Sciences [q-bio]
Abstract

ObjectiveKCNH5 encodes the voltage-gated potassium channel EAG2/Kv10.2. We aimed to delineate the neurodevelopmental and epilepsy phenotypic spectrum associated with de novo KCNH5 variants.MethodsWe screened 893 individuals with developmental and epileptic encephalopathies (DEEs) for KCNH5 variants using targeted or exome sequencing. Additional individuals with KCNH5 variants were identified through an international collaboration. Clinical history, EEG, and imaging data were analyzed; seizure types and epilepsy syndromes were classified. We included three previously published individuals including additional phenotypic details.ResultsWe report a cohort of 17 patients, including nine with a recurrent de novo missense variant p.Arg327His, four with a recurrent missense variant p.Arg333His, and four additional novel missense variants. All variants were located in or near the functionally critical voltage-sensing or pore domains, absent in the general population, and classified as pathogenic or likely pathogenic using American College of Medical Genetics and Genomics (ACMG) criteria. All individuals presented with epilepsy with a median seizure onset at six months. They had a wide range of seizure types, including focal and generalized seizures. Cognitive outcomes ranged from normal intellect to profound impairment. Individuals with the recurrent p.Arg333His variant had a self-limited drug-responsive focal or generalised epilepsy and normal intellect, while the recurrent p.Arg327His variant was associated with infantile-onset DEE. Two individuals with variants in the pore-domain were more severely affected, with neonatal-onset DEE, profound disability, and childhood death.ConclusionsWe report the first cohort of 17 individuals with pathogenic or likely pathogenic missense variants in the voltage sensing and pore domains of Kv10.2, including 14 previously unreported individuals. We present evidence for a putative emerging genotype-phenotype correlation with a spectrum of epilepsy and cognitive outcomes. Overall, we expand the role of EAG proteins in human disease and establish KCNH5 as implicated in a spectrum of neurodevelopmental disorders (NDDs) and epilepsy.

Published
2022

6. Novel variants in the NARS2 gene as a cause of infantile-onset severe epilepsy leading to fatal refractory status epilepticus: case study and literature review

Author

Petra Laššuthová, Lucie Sedlackova, Marketa Vlckova, Věra Sebroňová, Katalin Štěrbová, H Hansíková, and P Pavlíček

Subjects
medicine.medical_specialty, Neurology, business.industry, Neurodegeneration, Status epilepticus, Bioinformatics, medicine.disease, Compound heterozygosity, Human genetics, Cellular and Molecular Neuroscience, Epilepsy, Genetics, medicine, Spastic, medicine.symptom, business, Genetics (clinical), Exome sequencing
Abstract

Biallelic variants in the NARS2 gene are the cause of a continuous spectrum of neurodegenerative disorders presenting with various severity-from spastic paraplegia, progressive neurodegeneration to Leigh and Alpers syndrome. Common clinical signs result from a mitochondrial dysfunction based on OXPHOS deficiency. Here, we present a patient with infantile-onset severe epilepsy leading to fatal refractory status epilepticus. Whole exome sequencing with Exomiser analysis based on HPO terms detected two novel NARS2 variants in a compound heterozygous state. To date, 18 different NARS2 disease-causing mutations have been described. Our study adds to the understanding of this mitochondrial disorder.

Published
2021
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7. A Recurrent Missense Variant in AP2M1 Impairs Clathrin-Mediated Endocytosis and Causes Developmental and Epileptic Encephalopathy

Author

Batsal Devkota, José M. Serratosa, Joel N. Hirschhorn, Renzo Guerrini, Patrick May, Johanna A. Jähn, Paul Avillach, Yvonne G. Weber, Sha Tang, Kaja Kristine Selmer, Joseph J. Shen, Annika Rademacher, Joseph Peeden, Ulrich Stephani, Judson Kilbourn, Niklas Schwarz, Deb K. Pal, Lacey Smith, Trine Bjørg Hammer, Carla Marini, Deanne Taylor, Ingo Helbig, Rudi Balling, Arvid Suls, Holger Lerche, Karl Martin Klein, Simone Seiffert, Annapurna Poduri, Bobby P. C. Koeleman, Tania López-Hernández, Deepali N. Shinde, Stéphanie Baulac, Sawona Biswas, Eric LeGuern, Peter D. Galer, Volker Haucke, Katherine L. Helbig, Ian D. Krantz, Aarno Palotie, Sarah Weckhuysen, Nadja Hümpfer, Tiina Talvik, Rikke S. Møller, Roland Krause, Allison Heath, Dorota Hoffman-Zacharska, Nina Barišić, Peter De Jonghe, Hiltrud Muhle, In-Hee Lee, Kenneth D. Mandl, Felix Benninger, Dana Craiu, Florence T. Bourgeois, Colin A Ellis, Sanjay M. Sisodiya, Christel Depienne, Barbara Hallinan, Eric D. Marsh, Susanne Schubert-Bast, Manuela Pendziwiat, Kristen L. Sund, Federico Zara, Tracy A. Glauser, Katalin Štěrbová, Johannes R. Lemke, Oded Shor, Anna-Elina Lehesjoki, Helle Hjalgrim, Anna Bartels, Vladimir Komarek, Peter White, Tarja Linnankivi, Hande Caglayan, Sarah von Spiczak, Shiva Ganesan, Felix Rosenow, Sek Won Kong, Pasquale Striano, EuroEPINOMICS-RES Consortium, GRIN Consortium, Department of Medical and Clinical Genetics, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, Genomics of Neurological and Neuropsychiatric Disorders, Institute for Molecular Medicine Finland, HUS Children and Adolescents, and Children's Hospital

Subjects
0301 basic medicine, PROTEIN, ILAE COMMISSION, clathrin-mediated endocytosis, 3124 Neurology and psychiatry, Mice, Epilepsy, 0302 clinical medicine, BINDING, Conditional gene knockout, Missense mutation, Child, Genetics (clinical), Mice, Knockout, Genetics, Brain Diseases, neurodevelopmental disorders, Phenotype, Endocytosis, Adaptor Protein Complex mu Subunits, Child, Preschool, Female, POSITION PAPER, RECRUITMENT, Adolescent, computational phenotypes, developmental and epileptic encephalopathy, Human Phenotype Ontology, synaptic transmission, Adaptor Protein Complex 2, Mutation, Missense, Biology, CLASSIFICATION, Article, 03 medical and health sciences, Exome Sequencing, medicine, Animals, Humans, Synaptic vesicle recycling, ADAPTER AP-2, Generalized epilepsy, 3112 Neurosciences, Infant, Receptor-mediated endocytosis, medicine.disease, Clathrin, 030104 developmental biology, DE-NOVO MUTATIONS, 3111 Biomedicine, Human medicine, 030217 neurology & neurosurgery
Abstract

The developmental and epileptic encephalopathies (DEEs) are heterogeneous disorders with a strong genetic contribution, but the underlying genetic etiology remains unknown in a significant proportion of individuals. To explore whether statistical support for genetic etiologies can be generated on the basis of phenotypic features, we analyzed whole-exome sequencing data and phenotypic similarities by using Human Phenotype Ontology (HPO) in 314 individuals with DEEs. We identified a de novo c.508C>T (p.Arg170Trp) variant in AP2M1 in two individuals with a phenotypic similarity that was higher than expected by chance (p = 0.003) and a phenotype related to epilepsy with myoclonic-atonic seizures. We subsequently found the same de novo variant in two individuals with neurodevelopmental disorders and generalized epilepsy in a cohort of 2,310 individuals who underwent diagnostic whole-exome sequencing. AP2M1 encodes the mu-subunit of the adaptor protein complex 2 (AP-2), which is involved in clathrin-mediated endocytosis (CME) and synaptic vesicle recycling. Modeling of protein dynamics indicated that the p.Arg170Trp variant impairs the conformational activation and thermodynamic entropy of the AP-2 complex. Functional complementation of both the mu-subunit carrying the p.Arg170Trp variant in human cells and astrocytes derived from AP-2 mu conditional knockout mice revealed a significant impairment of CME of transferrin. In contrast, stability, expression levels, membrane recruitment, and localization were not impaired, suggesting a functional alteration of the AP-2 complex as the underlying disease mechanism. We establish a recurrent pathogenic variant in AP2M1 as a cause of DEEs with distinct phenotypic features, and we implicate dysfunction of the early steps of endocytosis as a disease mechanism in epilepsy.

Published
2019
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8. In response to: Fatal status epilepticus—the broad phenotypic heterogeneity of NARS2 variants. Author: Prof. Josef Finsterer

Author

Petra Laššuthová, Lucie Sedlackova, H Hansíková, Věra Sebroňová, Marketa Vlckova, Katalin Štěrbová, and P Pavlíček

Subjects
medicine.medical_specialty, Pediatrics, Neurology, business.industry, Genetic heterogeneity, MEDLINE, Status epilepticus, Severe epilepsy, Human genetics, Cellular and Molecular Neuroscience, Refractory, Genetics, Medicine, medicine.symptom, business, Gene, Genetics (clinical)
Published
2021
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10. Distinct gene-set burden patterns underlie common generalized and focal epilepsies

Author

Mahmoud Koko, Roland Krause, Thomas Sander, Dheeraj Reddy Bobbili, Michael Nothnagel, Patrick May, Holger Lerche, Yen-Chen Anne Feng, Daniel P Howrigan, Liam E Abbott, Katherine Tashman, Felecia Cerrato, Tarjinder Singh, Henrike Heyne, Andrea Byrnes, Claire Churchhouse, Nick Watts, Matthew Solomonson, Dennis Lal, Erin L Heinzen, Ryan S Dhindsa, Kate E Stanley, Gianpiero L Cavalleri, Hakon Hakonarson, Ingo Helbig, Sarah Weckhuysen, Slavé Petrovski, Sitharthan Kamalakaran, Sanjay M Sisodiya, Patrick Cossette, Chris Cotsapas, Peter DeJonghe, Tracy Dixon-Salazar, Renzo Guerrini, Patrick Kwan, Anthony G Marson, Randy Stewart, Chantal Depondt, Dennis J Dlugos, Ingrid E Scheffer, Pasquale Striano, Catharine Freyer, Kevin McKenna, Brigid M Regan, Susannah T Bellows, Costin Leu, Caitlin A Bennett, Esther M C Johns, Alexandra Macdonald, Hannah Shilling, Rosemary Burgess, Dorien Weckhuysen, Melanie Bahlo, Terence J O'Brien, Marian Todaro, Hannah Stamberger, Danielle M Andrade, Tara R Sadoway, Kelly Mo, Heinz Krestel, Sabina Gallati, Savvas S Papacostas, Ioanna Kousiappa, George A Tanteles, Katalin Štěrbová, Markéta Vlčková, Lucie Sedláčková, Petra Laššuthová, Karl Martin Klein, Felix Rosenow, Philipp S Reif, Susanne Knake, Wolfram S Kunz, Gábor Zsurka, Christian E Elger, Jürgen Bauer, Michael Rademacher, Manuela Pendziwiat, Hiltrud Muhle, Annika Rademacher, Andreas vanBaalen, Sarah vonSpiczak, Ulrich Stephani, Zaid Afawi, Amos D Korczyn, Moien Kanaan, Christina Canavati, Gerhard Kurlemann, Karen Müller-Schlüter, Gerhard Kluger, Martin Häusler, Ilan Blatt, Johannes R Lemke, Ilona Krey, Yvonne G Weber, Stefan Wolking, Felicitas Becker, Christian Hengsbach, Sarah Rau, Ana F Maisch, Bernhard J Steinhoff, Andreas Schulze-Bonhage, Susanne Schubert-Bast, Herbert Schreiber, Ingo Borggräfe, Christoph J Schankin, Thomas Mayer, Rudolf Korinthenberg, Knut Brockmann, Dieter Dennig, Rene Madeleyn, Reetta Kälviäinen, Pia Auvinen, Anni Saarela, Tarja Linnankivi, Anna-Elina Lehesjoki, Mark I Rees, Seo-Kyung Chung, William O Pickrell, Robert Powell, Natascha Schneider, Simona Balestrini, Sara Zagaglia, Vera Braatz, Michael R Johnson, Pauls Auce, Graeme J Sills, Larry W Baum, Pak C Sham, Stacey S Cherny, Colin H T Lui, Nina Barišić, Norman Delanty, Colin P Doherty, Arif Shukralla, Mark McCormack, Hany El-Naggar, Laura Canafoglia, Silvana Franceschetti, Barbara Castellotti, Tiziana Granata, Federico Zara, Michele Iacomino, Francesca Madia, Maria Stella Vari, Maria Margherita Mancardi, Vincenzo Salpietro, Francesca Bisulli, Paolo Tinuper, Laura Licchetta, Tommaso Pippucci, Carlotta Stipa, Raffaella Minardi, Antonio Gambardella, Angelo Labate, Grazia Annesi, Lorella Manna, Monica Gagliardi, Elena Parrini, Davide Mei, Annalisa Vetro, Claudia Bianchini, Martino Montomoli, Viola Doccini, Carla Marini, Toshimitsu Suzuki, Yushi Inoue, Kazuhiro Yamakawa, Birute Tumiene, Lynette G Sadleir, Chontelle King, Emily Mountier, Hande S Caglayan, Mutluay Arslan, Zuhal Yapıcı, Uluc Yis, Pınar Topaloglu, Bulent Kara, Dilsad Turkdogan, Aslı Gundogdu-Eken, Nerses Bebek, Sibel Uğur-İşeri, Betül Baykan, Barış Salman, Garen Haryanyan, Emrah Yücesan, Yeşim Kesim, Çiğdem Özkara, Annapurna Poduri, Beth R Shiedley, Catherine Shain, Russell J Buono, Thomas N Ferraro, Michael R Sperling, Warren Lo, Michael Privitera, Jacqueline A French, Steven Schachter, Ruben I Kuzniecky, Orrin Devinsky, Manu Hegde, Pouya Khankhanian, Katherine L Helbig, Colin A Ellis, Gianfranco Spalletta, Fabrizio Piras, Federica Piras, Tommaso Gili, Valentina Ciullo, Andreas Reif, Andrew McQuillin, Nick Bass, Andrew McIntosh, Douglas Blackwood, Mandy Johnstone, Aarno Palotie, Michele T Pato, Carlos N Pato, Evelyn J Bromet, Celia Barreto Carvalho, Eric D Achtyes, Maria Helena Azevedo, Roman Kotov, Douglas S Lehrer, Dolores Malaspina, Stephen R Marder, Helena Medeiros, Christopher P Morley, Diana O Perkins, Janet L Sobell, Peter F Buckley, Fabio Macciardi, Mark H Rapaport, James A Knowles, Genomic Psychiatry Cohort, Ayman H Fanous, Steven A McCarroll, Namrata Gupta, Stacey B Gabriel, Mark J Daly, Eric S Lander, Daniel H Lowenstein, David B Goldstein, Samuel F Berkovic, Benjamin M Neale, Epi25 Collaborative, Koko M., Krause R., Sander T., Bobbili D.R., Nothnagel M., May P., Lerche H., Bisulli F., Tinuper P., Pippucci T., Abbott, Liam E., Hengsbach, Christian, Rau, Sarah, Maisch, Ana F., Steinhoff, Bernhard J., Schulze-Bonhage, Andreas, Schubert-Bast, Susanne, Schreiber, Herbert, Borggräfe, Ingo, Schankin, Christoph J., Mayer, Thomas, Tashman, Katherine, Korinthenberg, Rudolf, Brockmann, Knut, Kurlemann, Gerhard, Dennig, Dieter, Madeleyn, Rene, Kälviäinen, Reetta, Auvinen, Pia, Saarela, Anni, Linnankivi, Tarja, Lehesjoki, Anna-Elina, Cerrato, Felecia, Rees, Mark I., Chung, Seo-Kyung, Pickrell, William O., Powell, Robert, Schneider, Natascha, Balestrini, Simona, Zagaglia, Sara, Braatz, Vera, Johnson, Michael R., Auce, Pauls, Singh, Tarjinder, Sills, Graeme J., Baum, Larry W., Sham, Pak C., Cherny, Stacey S., Lui, Colin H. T., Barišic, Nina, Delanty, Norman, Doherty, Colin P., Shukralla, Arif, McCormack, Mark, Heyne, Henrike, El-Naggar, Hany, Canafoglia, Laura, Franceschetti, Silvana, Castellotti, Barbara, Granata, Tiziana, Zara, Federico, Iacomino, Michele, Madia, Francesca, Vari, Maria Stella, Mancardi, Maria Margherita, Byrnes, Andrea, Salpietro, Vincenzo, Bisulli, Francesca, Tinuper, Paolo, Licchetta, Laura, Pippucci, Tommaso, Stipa, Carlotta, Minardi, Raffaella, Gambardella, Antonio, Labate, Angelo, Annesi, Grazia, Churchhouse, Claire, Manna, Lorella, Gagliardi, Monica, Parrini, Elena, Mei, Davide, Vetro, Annalisa, Bianchini, Claudia, Montomoli, Martino, Doccini, Viola, Marini, Carla, Suzuki, Toshimitsu, Watts, Nick, Inoue, Yushi, Yamakawa, Kazuhiro, Tumiene, Birute, Sadleir, Lynette G., King, Chontelle, Mountier, Emily, Caglayan, Hande S., Arslan, Mutluay, Yapici, Zuhal, Yis, Uluc, Solomonson, Matthew, Topaloglu, Pinar, Kara, Bulent, Turkdogan, Dilsad, Gundogdu-Eken, Asli, Bebek, Nerses, Ugur-Iseri, Sibel, Baykan, Betül, Salman, Baris, Haryanyan, Garen, Yücesan, Emrah, Lal, Dennis, Kesim, Yesim, Özkara, Çigdem, Poduri, Annapurna, Shiedley, Beth R., Shain, Catherine, Buono, Russell J., Ferraro, Thomas N., Sperling, Michael R., Lo, Warren, Privitera, Michael, Heinzen, Erin L., French, Jacqueline A., Schachter, Steven, Kuzniecky, Ruben I., Devinsky, Orrin, Hegde, Manu, Khankhanian, Pouya, Helbig, Katherine L., Ellis, Colin A., Spalletta, Gianfranco, Piras, Fabrizio, Dhindsa, Ryan S., Piras, Federica, Gili, Tommaso, Ciullo, Valentina, Reif, Andreas, McQuillin, Andrew, Bass, Nick, McIntosh, Andrew, Blackwood, Douglas, Johnstone, Mandy, Palotie, Aarno, Stanley, Kate E., Pato, Michele T., Pato, Carlos N., Bromet, Evelyn J., Carvalho, Celia Barreto, Achtyes, Eric D., Azevedo, Maria Helena, Kotov, Roman, Lehrer, Douglas S., Malaspina, Dolores, Marder, Stephen R., Cavalleri, Gianpiero L., Medeiros, Helena, Morley, Christopher P., Perkins, Diana O., Sobell, Janet L., Buckley, Peter F., Macciardi, Fabio, Rapaport, Mark H., Knowles, James A., Cohort, Genomic Psychiatry, Fanous, Ayman H., Hakonarson, Hakon, McCarroll, Steven A., Gupta, Namrata, Gabriel, Stacey B., Daly, Mark J., Lander, Eric S., Lowenstein, Daniel H., Goldstein, David B., Lerche, Holger, Berkovic, Samuel F., Neale, Benjamin M., Helbig, Ingo, Krause, Roland, May, Patrick, Weckhuysen, Sarah, Petrovski, Slavé, Kamalakaran, Sitharthan, Sisodiya, Sanjay M., Cossette, Patrick, Cotsapas, Chris, DeJonghe, Peter, Dixon-Salazar, Tracy, Guerrini, Renzo, Kwan, Patrick, Marson, Anthony G., Stewart, Randy, Depondt, Chantal, Dlugos, Dennis J., Scheffer, Ingrid E., Striano, Pasquale, Freyer, Catharine, McKenna, Kevin, Regan, Brigid M., Bellows, Susannah T., Leu, Costin, Bennett, Caitlin A., Johns, Esther M. C., Macdonald, Alexandra, Shilling, Hannah, Burgess, Rosemary, Weckhuysen, Dorien, Bahlo, Melanie, O'Brien, Terence J., Todaro, Marian, Stamberger, Hannah, Andrade, Danielle M., Sadoway, Tara R., Mo, Kelly, Krestel, Heinz, Gallati, Sabina, Papacostas, Savvas S., Kousiappa, Ioanna, Tanteles, George A., Šterbová, Katalin, Vlcková, Markéta, Sedlácková, Lucie, Laššuthová, Petra, Klein, Karl Martin, Rosenow, Felix, Reif, Philipp S., Knake, Susanne, Kunz, Wolfram S., Zsurka, Gábor, Elger, Christian E., Bauer, Jürgen, Rademacher, Michael, Feng, Yen-Chen Anne, Pendziwiat, Manuela, Muhle, Hiltrud, Rademacher, Annika, van Baalen, Andreas, von Spiczak, Sarah, Stephani, Ulrich, Afawi, Zaid, Korczyn, Amos D., Kanaan, Moien, Canavati, Christina, Howrigan, Daniel P., Müller-Schlüter, Karen, Kluger, Gerhard, Häusler, Martin, Blatt, Ilan, Lemke, Johannes R., Krey, Ilona, Weber, Yvonne G., Wolking, Stefan, Becker, Felicitas, DFG Research Unit FOR-2715 (Germany), FNR (Luxembourg), NHGRI (US), NHLBI (US), DAAD (Germany). [sponsor], and Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center]

Subjects
Exome sequencing, Male, Medicine (General), Neurology [D14] [Human health sciences], Gene-set, Genome-wide association study, Disease, Biology, Epileptogenesis, General Biochemistry, Genetics and Molecular Biology, Whole Exome Sequencing, Epilepsy, R5-920, medicine, Missense mutation, Humans, Exome, Genetic Predisposition to Disease, Gene, Genetic association, Ultra-rare variant, Genetics, Neurologie [D14] [Sciences de la santé humaine], Burden analysis, Genetic Variation, General Medicine, medicine.disease, Ultra-rare variants, Gene-sets, Case-Control Studies, Medicine, epilepsy, Epilepsy, Generalized, Female, Genetics & genetic processes [F10] [Life sciences], Epilepsies, Partial, Human medicine, Burden analysi, Génétique & processus génétiques [F10] [Sciences du vivant], Case-Control Studie, Research Paper, Genome-Wide Association Study, Human
Abstract

EBioMedicine 72, 103588 (2021). doi:10.1016/j.ebiom.2021.103588, Published by Elsevier, Amsterdam [u.a.]

Published
2021
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11. Severe neurodevelopmental disorder with intractable seizures due to a novel SLC1A4 homozygous variant

Author

Pavel Seeman, Petra Laššuthová, Lucie Sedlackova, Irena Buksakowska, Katalin Štěrbová, David Staněk, Martin Kudr, and Marketa Vlckova

Subjects
0301 basic medicine, Amino Acid Transport System ASC, Male, Microcephaly, Population, 030105 genetics & heredity, Bioinformatics, 03 medical and health sciences, Epilepsy, symbols.namesake, Neurodevelopmental disorder, Seizures, Genetics, medicine, Humans, Global developmental delay, education, Child, Gene, Genetics (clinical), Exome sequencing, Sanger sequencing, education.field_of_study, business.industry, Homozygote, General Medicine, medicine.disease, 030104 developmental biology, Neurodevelopmental Disorders, Mutation, symbols, business
Abstract

Introduction Biallelic variants in the SLC1A4 gene have been so far identified as a very rare cause of neurodevelopmental disorders with or without epilepsy and almost exclusively described in the Ashkenazi-Jewish population. Patients and methods Here we present Czech patient with microcephaly, severe global developmental delay and intractable seizures whose condition remained undiagnosed despite access to clinical experience and standard diagnostic methods including examination with an epilepsy targeted NGS gene panel. Results Whole exome sequencing revealed a novel variant NM_003038.4:c.1370G > A p.(Arg457Gln) of the SLC1A4 gene in a homozygous state in the patient, and afterwards Sanger sequencing in both parents confirmed the biallelic origin of the variant. A variant in the same codon, but with a different amino acid exchange, was described previously in a patient that had a very similar phenotype, however, without epilepsy. Conclusion Our data suggest that the SLC1A4 gene should be considered in the diagnosis of patients with severe, early onset neurodevelopmental impairment with epilepsy and encourage the analysis of SLC1A4 gene variants via targeted NGS gene panel or whole exome sequencing.

Published
2020

12. Genetic causes of epilepsy

Author

Petra Laššuthová, Marketa Vlckova, and Katalin Štěrbová

Subjects
General Medicine
Abstract

Rozvoj v oblasti molekularně genetických metod vede k narůstu objasněni genetických přicin epilepsii, zejmena zavažných epilepsiidětskeho věku asociovaných s komorbiditami. Pro spravnou interpretaci nalezů je nezbytna spoluprace neurologa, klinickehogenetika a molekularniho biologa.

Published
2018
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13. Schinzel—Giedion Syndrome: First Czech Patients Confirmed by Molecular Genetic Analysis

Author

Vladimir Komarek, Jana Neupauerová, David Staněk, Pavel Seeman, Katalin Štěrbová, Marketa Vlckova, Petra Laššuthová, Andrea Gřegořová, and Marketa Havlovicova

Subjects
0301 basic medicine, Genetics, Czech, Sanger sequencing, business.industry, Schinzel–Giedion syndrome, SETBP1 Gene, Genetic disorder, 030105 genetics & heredity, medicine.disease, language.human_language, 03 medical and health sciences, Exon, symbols.namesake, 0302 clinical medicine, Pediatrics, Perinatology and Child Health, medicine, language, symbols, Neurology (clinical), business, Gene, 030217 neurology & neurosurgery, Exome sequencing
Abstract

Schinzel–Giedion syndrome (SGS) is a very rare genetic disorder characterized by distinctive facial features, severe developmental delay, seizures, and skeletal abnormalities. Whole exome sequencing, Sanger sequencing, and correlation with already published variants and cases allowed us to identify two different de novo mutations in the SETBP1 gene: NM_015559.2 (SETBP1): c.2601C > G (p.Ser867Arg) and c. 2608 G > A (p.Gly870Ser) in two Czech patients presenting with SGS features. Both mutations are within exon 4 of SETBP1, supporting the notion that exon 4 represents the mutation hotspot of the gene in patients with SGS.

Published
2018
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14. IQSEC2-related encephalopathy in males and females: a comparative study including 37 novel patients

Author

Darina Prchalova, Philippe Pm Campeau, Bénédicte Duban-Bedu, Jacques L. Michaud, Marije Koopmans, Arnold Munnich, Christel Depienne, Marilyn Tallot, Fadi F. Hamdan, Eveline Hagebeuk, Marie-Laure Moutard, Anna Kaminska, Petra Laššuthová, Kathryn G. Miller, Ange Line Bruel, Xilma Xr Ortiz-Gonzalez, Shoji Ichikawa, Ingo Helbig, Ethan Em Goldberg, Sarah Weckhuysen, Daphné Lehalle, Elena Gardella, Marie-Bertille Dehouck, Claude Besmond, Patrick Edery, Christine Ioos, Pauline Marzin, Christine Coubes, Julien Buratti, Rima Nabbout, Hubert Journel, Audrey Putoux, Giulia Barcia, Laurence Hubert, Claire Davidson, Berten Ceulemans, Ana Ag Cristancho, Fiona Cunningham, Chloé Quélin, Christèle Dubourg, Aoife Ac McMahon, Thomas Smol, Delphine Héron, Katalin Štěrbová, Katherine Kl Helbig, Boris Keren, Ivan Shelihan, Damien Lederer, Rikke Rs Møller, Emílie Vyhnálková, Alyssa R. Rosen, Natasha Shur, Julie Gauthier, Dragan Marjanovic, Berge Ba Minassian, Marleen Simon, Ledia Brunga, Guillaume Smits, Sandra Janssens, Catheline Vilain, Gaetan Lesca, Caroline Nava, Jasper J. van der Smagt, Laurent Villard, Cyril Mignot, Samuel P. Yang, Joelle Roume, Julie Soblet, JM Pinard, Stéphanie Gobin-Limballe, Bobby P. C. Koeleman, Miroslava Hancarova, Elizabeth J. Donner, Nienke Ne Verbeek, Marie-Line Jacquemont, Marjan J. A. van Kempen, Julia Metreau, David Geneviève, Joannella Morales, Peter M. van Hasselt, Christine Barnerias, Caroline Lacoste, Claire Bar, Thierry Bienvenu, Mathieu Milh, Elsa Rossignol, Marseille medical genetics - Centre de génétique médicale de Marseille (MMG), Institut National de la Santé et de la Recherche Médicale (INSERM)-Aix Marseille Université (AMU), Institut du Cerveau = Paris Brain Institute (ICM), 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)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), European Bioinformatics Institute [Hinxton] (EMBL-EBI), EMBL Heidelberg, Imagine - Institut des maladies génétiques (IMAGINE - U1163), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), CHU Necker - Enfants Malades [AP-HP], Université Paris Descartes - Paris 5 (UPD5), CHU Sainte Justine [Montréal], Centre Hospitalier Universitaire de La Réunion (CHU La Réunion), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (CRNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Hospices Civils de Lyon (HCL), Service de Génétique Médicale [CHU Necker], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Necker - Enfants Malades [AP-HP], Service de neurologie pédiatrique [CHU Necker], Institut de psychiatrie et neurosciences (U894 / UMS 1266), Service de biochimie et de génétique moléculaire [CHU Cochin], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Hôpital Cochin [AP-HP], Hôpital Cochin [AP-HP], Génétique des Anomalies du Développement (GAD), Université de Bourgogne (UB)-IFR100 - Structure fédérative de recherche Santé-STIC, The Hospital for sick children [Toronto] (SickKids), University of Antwerp (UA), Département de génétique médicale, maladies rares et médecine personnalisée [CHRU Montpellier], Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Children’s Hospital of Philadelphia (CHOP ), Hôpital Saint-Vincent de Paul, Institut de Génétique et Développement de Rennes (IGDR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), University of Southern Denmark (SDU), Cellules Souches, Plasticité Cellulaire, Médecine Régénératrice et Immunothérapies (IRMB), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), University Hospital Motol [Prague], Hôpital Raymond Poincaré [AP-HP], Center for Medical Genetics [Ghent], Ghent University Hospital, University Medical Center [Utrecht], Institut de Pathologie et Génétique [Gosselies] (I.P.G.), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, CHI Créteil, AP-HP Hôpital Bicêtre (Le Kremlin-Bicêtre), CHU Trousseau [APHP], Université de Lyon, CHI Poissy-Saint-Germain, Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), Université libre de Bruxelles (ULB), Hôpital Erasme [Bruxelles] (ULB), Faculté de Médecine [Bruxelles] (ULB), Université libre de Bruxelles (ULB)-Université libre de Bruxelles (ULB), Antwerp University Hospital [Edegem] (UZA), Département de génétique médicale [Hôpital de la Timone - APHM], Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)- Hôpital de la Timone [CHU - APHM] (TIMONE)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre Hospitalier Universitaire [Rennes], Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute (ICM), 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)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Service de Génétique Cytogénétique et Embryologie [CHU Pitié-Salpêtrière], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Service de Neuropédiatrie [CHU Trousseau], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Trousseau [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Centre de recherche en neurosciences de Lyon (CRNL), IFR100 - Structure fédérative de recherche Santé-STIC-Université de Bourgogne (UB), Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), and Centre de Psychiatrie et Neurosciences (U894)

Subjects
0301 basic medicine, Male, Génétique clinique, [SDV]Life Sciences [q-bio], Medizin, Physiology, 030105 genetics & heredity, Seizures/epidemiology, Epilepsy, Brain Diseases/epidemiology, X-linked inheritance, Intellectual disability, Guanine Nucleotide Exchange Factors, Protein Isoforms, Missense mutation, Genetics(clinical), 10. No inequality, Non-U.S. Gov't, Genetics (clinical), X-linked recessive inheritance, ComputingMilieux_MISCELLANEOUS, Brain Diseases, Sex Characteristics, Research Support, Non-U.S. Gov't, Brain, Sciences bio-médicales et agricoles, 3. Good health, Pedigree, Phenotype, intellectual disability, Female, Brain/growth & development, Sex characteristics, Génétique moléculaire, Guanine Nucleotide Exchange Factors/genetics, Encephalopathy, Research Support, X-inactivation, Article, 03 medical and health sciences, Seizures, Protein Isoforms/genetics, medicine, Journal Article, IQSEC2, Humans, Intellectual Disability/epidemiology, [SDV.GEN]Life Sciences [q-bio]/Genetics, business.industry, Infant, Newborn, isoforms, Correction, Infant, medicine.disease, Newborn, Human genetics, 030104 developmental biology, Mutation, epilepsy, Human medicine, business, [SDV.MHEP]Life Sciences [q-bio]/Human health and pathology
Abstract

Variants in IQSEC2, escaping X inactivation, cause X-linked intellectual disability with frequent epilepsy in males and females. We aimed to investigate sex-specific differences., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019
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15. Genetic heterogeneity in infantile spasms

Author

Rikke S. Møller, Dorota Hoffman-Zacharska, Alison M. Muir, Pasquale Striano, Sarah Weckhuysen, Sarah von Spiczak, José M. Serratosa, Carla Marini, Julia Saykally, Ingo Helbig, Nancy T. Nguyen, Dana Craiu, Renzo Guerrini, Candace T. Myers, Heather C Mefford, Anna-Elina Lehesjoki, Peter De Jonghe, Katalin Štěrbová, Department of Medical and Clinical Genetics, University Management, Faculty of Medicine, University of Helsinki, and EuroEPINOMICS-RES NLES Working Grp

Subjects
0301 basic medicine, Monosaccharide Transport Proteins, Epilepsy, Genetic diagnosis, Infantile spasms, Targeted sequencing, West syndrome, Kinesins, Receptors, Cytoplasmic and Nuclear, GTP-Binding Protein alpha Subunits, Gi-Go, VARIANTS, Bioinformatics, GNAO1, Article, 3124 Neurology and psychiatry, 03 medical and health sciences, Shab Potassium Channels, 0302 clinical medicine, Humans, Medicine, STXBP1, LANDSCAPE, business.industry, Genetic heterogeneity, Incidence (epidemiology), 3112 Neurosciences, Infant, West Syndrome, medicine.disease, 3. Good health, Repressor Proteins, 030104 developmental biology, Neurology, DE-NOVO MUTATIONS, Child, Preschool, Mutation, Cohort, Etiology, Neurology (clinical), Human medicine, business, Spasms, Infantile, 030217 neurology & neurosurgery
Abstract

Infantile spasms (IS) is a developmental and epileptic encephalopathy with heterogeneous etiologies including many genetic causes. Genetic studies have identified pathogenic variants in over 30 genes as causes of IS. Many of these genetic causes are extremely rare, with only one reported incidence in an individual with IS. To better understand the genetic landscape of IS, we used targeted sequencing to screen 42 candidate IS genes and 53 established developmental and epileptic encephalopathy genes in 92 individual with IS. We identified a genetic diagnosis for 7.6% of our cohort, including pathogenic variants in KCNB1 (n = 2), GNA01 (n = 1), STXBP1 (n = 1), SLC35A2 (n = 1), TBLIXR1 (n = 1), and K1F1A (n = 1). Our data emphasize the genetic heterogeneity of IS and will inform the diagnosis and management of individuals with this devastating disorder.

Published
2019
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16. Correction: IQSEC2-related encephalopathy in males and females:a comparative study including 37 novel patients

Author

Petra Laššuthová, Kathryn G. Miller, Jacques L. Michaud, Sarah Weckhuysen, Claude Besmond, Stéphanie Gobin-Limballe, Emílie Vyhnálková, Aoife McMahon, Peter M. van Hasselt, Christine Barnerias, Laurence Hubert, Joannella Morales, Daphné Lehalle, Caroline Lacoste, Rima Nabbout, Hubert Journel, Jasper J. van der Smagt, Patrick Edery, Marjan J. A. van Kempen, Samuel P. Yang, Fiona Cunningham, Thomas Smol, Delphine Héron, Darina Prchalova, David Geneviève, Thierry Bienvenu, Mathieu Milh, Bénédicte Duban-Bedu, Ledia Brunga, Marleen Simon, Ana G. Cristancho, Ethan M. Goldberg, Sandra Janssens, Christel Depienne, Miroslava Hancarova, Shoji Ichikawa, Berge A. Minassian, Ivan Shelihan, Elsa Rossignol, Ange Line Bruel, Elena Gardella, Marije Koopmans, Arnold Munnich, Natasha Shur, Pauline Marzin, Ingo Helbig, Julien Buratti, Alyssa R. Rosen, Giulia Barcia, Claire Davidson, Berten Ceulemans, Marilyn Tallot, Marie Line Jacquemont, Guillaume Smits, Catheline Vilain, Katherine L. Helbig, Gaetan Lesca, Rikke S. Møller, Claire Bar, Marie Laure Moutard, Caroline Nava, Marie Bertille Dehouck, Julie Soblet, Philippe M. Campeau, Cyril Mignot, Laurent Villard, Joelle Roume, Julia Metreau, Dragan Marjanovic, Damien Lederer, Audrey Putoux, Chloé Quélin, Fadi F. Hamdan, Boris Keren, Anna Kaminska, Xilma R. Ortiz-Gonzalez, Christine Ioos, Christine Coubes, Julie Gauthier, Nienke E. Verbeek, Bobby P. C. Koeleman, Eveline Hagebeuk, Jean Marc Pinard, Katalin Štěrbová, Christèle Dubourg, and Elizabeth J. Donner

Subjects
Pediatrics, medicine.medical_specialty, Text mining, business.industry, Published Erratum, Encephalopathy, Medizin, MEDLINE, Medicine, business, medicine.disease, Genetics (clinical)
Abstract

This Article was originally published under Nature Research’s License to Publish, but has now been made available under a CC BY 4.0 license. The PDF and HTML versions of the Article have been modified accordingly.

Published
2019
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17. Ultra-Rare Genetic Variation in the Epilepsies: A Whole-Exome Sequencing Study of 17,606 Individuals

Author

Yen-Chen Anne Feng, Daniel P. Howrigan, Liam E. Abbott, Katherine Tashman, Felecia Cerrato, Tarjinder Singh, Henrike Heyne, Andrea Byrnes, Claire Churchhouse, Nick Watts, Matthew Solomonson, Dennis Lal, Erin L. Heinzen, Ryan S. Dhindsa, Kate E. Stanley, Gianpiero L. Cavalleri, Hakon Hakonarson, Ingo Helbig, Roland Krause, Patrick May, Sarah Weckhuysen, Slavé Petrovski, Sitharthan Kamalakaran, Sanjay M. Sisodiya, Patrick Cossette, Chris Cotsapas, Peter De Jonghe, Tracy Dixon-Salazar, Renzo Guerrini, Patrick Kwan, Anthony G. Marson, Randy Stewart, Chantal Depondt, Dennis J. Dlugos, Ingrid E. Scheffer, Pasquale Striano, Catharine Freyer, Kevin McKenna, Brigid M. Regan, Susannah T. Bellows, Costin Leu, Caitlin A. Bennett, Esther M.C. Johns, Alexandra Macdonald, Hannah Shilling, Rosemary Burgess, Dorien Weckhuysen, Melanie Bahlo, Terence J. O’Brien, Marian Todaro, Hannah Stamberger, Danielle M. Andrade, Tara R. Sadoway, Kelly Mo, Heinz Krestel, Sabina Gallati, Savvas S. Papacostas, Ioanna Kousiappa, George A. Tanteles, Katalin Štěrbová, Markéta Vlčková, Lucie Sedláčková, Petra Laššuthová, Karl Martin Klein, Felix Rosenow, Philipp S. Reif, Susanne Knake, Wolfram S. Kunz, Gábor Zsurka, Christian E. Elger, Jürgen Bauer, Michael Rademacher, Manuela Pendziwiat, Hiltrud Muhle, Annika Rademacher, Andreas van Baalen, Sarah von Spiczak, Ulrich Stephani, Zaid Afawi, Amos D. Korczyn, Moien Kanaan, Christina Canavati, Gerhard Kurlemann, Karen Müller-Schlüter, Gerhard Kluger, Martin Häusler, Ilan Blatt, Johannes R. Lemke, Ilona Krey, Yvonne G. Weber, Stefan Wolking, Felicitas Becker, Christian Hengsbach, Sarah Rau, Ana F. Maisch, Bernhard J. Steinhoff, Andreas Schulze-Bonhage, Susanne Schubert-Bast, Herbert Schreiber, Ingo Borggräfe, Christoph J. Schankin, Thomas Mayer, Rudolf Korinthenberg, Knut Brockmann, Dieter Dennig, Rene Madeleyn, Reetta Kälviäinen, Pia Auvinen, Anni Saarela, Tarja Linnankivi, Anna-Elina Lehesjoki, Mark I. Rees, Seo-Kyung Chung, William O. Pickrell, Robert Powell, Natascha Schneider, Simona Balestrini, Sara Zagaglia, Vera Braatz, Michael R. Johnson, Pauls Auce, Graeme J. Sills, Larry W. Baum, Pak C. Sham, Stacey S. Cherny, Colin H.T. Lui, Nina Barišić, Norman Delanty, Colin P. Doherty, Arif Shukralla, Mark McCormack, Hany El-Naggar, Laura Canafoglia, Silvana Franceschetti, Barbara Castellotti, Tiziana Granata, Federico Zara, Michele Iacomino, Francesca Madia, Maria Stella Vari, Maria Margherita Mancardi, Vincenzo Salpietro, Francesca Bisulli, Paolo Tinuper, Laura Licchetta, Tommaso Pippucci, Carlotta Stipa, Raffaella Minardi, Antonio Gambardella, Angelo Labate, Grazia Annesi, Lorella Manna, Monica Gagliardi, Elena Parrini, Davide Mei, Annalisa Vetro, Claudia Bianchini, Martino Montomoli, Viola Doccini, Carla Marini, Toshimitsu Suzuki, Yushi Inoue, Kazuhiro Yamakawa, Birute Tumiene, Lynette G. Sadleir, Chontelle King, Emily Mountier, S. Hande Caglayan, Mutluay Arslan, Zuhal Yapıcı, Uluc Yis, Pınar Topaloglu, Bulent Kara, Dilsad Turkdogan, Aslı Gundogdu-Eken, Nerses Bebek, Sibel Uğur-İşeri, Betül Baykan, Barış Salman, Garen Haryanyan, Emrah Yücesan, Yeşim Kesim, Çiğdem Özkara, Annapurna Poduri, Beth R. Shiedley, Catherine Shain, Russell J. Buono, Thomas N. Ferraro, Michael R. Sperling, Warren Lo, Michael Privitera, Jacqueline A. French, Steven Schachter, Ruben I. Kuzniecky, Orrin Devinsky, Manu Hegde, Pouya Khankhanian, Katherine L. Helbig, Colin A. Ellis, Gianfranco Spalletta, Fabrizio Piras, Federica Piras, Tommaso Gili, Valentina Ciullo, Andreas Reif, Andrew McQuillin, Nick Bass, Andrew McIntosh, Douglas Blackwood, Mandy Johnstone, Aarno Palotie, Michele T. Pato, Carlos N. Pato, Evelyn J. Bromet, Celia Barreto Carvalho, Eric D. Achtyes, Maria Helena Azevedo, Roman Kotov, Douglas S. Lehrer, Dolores Malaspina, Stephen R. Marder, Helena Medeiros, Christopher P. Morley, Diana O. Perkins, Janet L. Sobell, Peter F. Buckley, Fabio Macciardi, Mark H. Rapaport, James A. Knowles, Ayman H. Fanous, Steven A. McCarroll, Namrata Gupta, Stacey B. Gabriel, Mark J. Daly, Eric S. Lander, Daniel H. Lowenstein, David B. Goldstein, Holger Lerche, Samuel F. Berkovic, Benjamin M. Neale, Wellcome Trust, Department of Health, Institute of Neurology, UCL, Imperial College Healthcare NHS Trust- BRC Funding, Commission of the European Communities, Medical Research Council (MRC), Feng Y.-C.A., Howrigan D.P., Abbott L.E., Tashman K., Cerrato F., Singh T., Heyne H., Byrnes A., Churchhouse C., Watts N., Solomonson M., Lal D., Heinzen E.L., Dhindsa R.S., Stanley K.E., Cavalleri G.L., Hakonarson H., Helbig I., Krause R., May P., Weckhuysen S., Petrovski S., Kamalakaran S., Sisodiya S.M., Cossette P., Cotsapas C., De Jonghe P., Dixon-Salazar T., Guerrini R., Kwan P., Marson A.G., Stewart R., Depondt C., Dlugos D.J., Scheffer I.E., Striano P., Freyer C., McKenna K., Regan B.M., Bellows S.T., Leu C., Bennett C.A., Johns E.M.C., Macdonald A., Shilling H., Burgess R., Weckhuysen D., Bahlo M., O'Brien T.J., Todaro M., Stamberger H., Andrade D.M., Sadoway T.R., Mo K., Krestel H., Gallati S., Papacostas S.S., Kousiappa I., Tanteles G.A., Sterbova K., Vlckova M., Sedlackova L., Lassuthova P., Klein K.M., Rosenow F., Reif P.S., Knake S., Kunz W.S., Zsurka G., Elger C.E., Bauer J., Rademacher M., Pendziwiat M., Muhle H., Rademacher A., van Baalen A., von Spiczak S., Stephani U., Afawi Z., Korczyn A.D., Kanaan M., Canavati C., Kurlemann G., Muller-Schluter K., Kluger G., Hausler M., Blatt I., Lemke J.R., Krey I., Weber Y.G., Wolking S., Becker F., Hengsbach C., Rau S., Maisch A.F., Steinhoff B.J., Schulze-Bonhage A., Schubert-Bast S., Schreiber H., Borggrafe I., Schankin C.J., Mayer T., Korinthenberg R., Brockmann K., Dennig D., Madeleyn R., Kalviainen R., Auvinen P., Saarela A., Linnankivi T., Lehesjoki A.-E., Rees M.I., Chung S.-K., Pickrell W.O., Powell R., Schneider N., Balestrini S., Zagaglia S., Braatz V., Johnson M.R., Auce P., Sills G.J., Baum L.W., Sham P.C., Cherny S.S., Lui C.H.T., Barisic N., Delanty N., Doherty C.P., Shukralla A., McCormack M., El-Naggar H., Canafoglia L., Franceschetti S., Castellotti B., Granata T., Zara F., Iacomino M., Madia F., Vari M.S., Mancardi M.M., Salpietro V., Bisulli F., Tinuper P., Licchetta L., Pippucci T., Stipa C., Minardi R., Gambardella A., Labate A., Annesi G., Manna L., Gagliardi M., Parrini E., Mei D., Vetro A., Bianchini C., Montomoli M., Doccini V., Marini C., Suzuki T., Inoue Y., Yamakawa K., Tumiene B., Sadleir L.G., King C., Mountier E., Caglayan S.H., Arslan M., Yapici Z., Yis U., Topaloglu P., Kara B., Turkdogan D., Gundogdu-Eken A., Bebek N., Ugur-Iseri S., Baykan B., Salman B., Haryanyan G., Yucesan E., Kesim Y., Ozkara C., Poduri A., Shiedley B.R., Shain C., Buono R.J., Ferraro T.N., Sperling M.R., Lo W., Privitera M., French J.A., Schachter S., Kuzniecky R.I., Devinsky O., Hegde M., Khankhanian P., Helbig K.L., Ellis C.A., Spalletta G., Piras F., Gili T., Ciullo V., Reif A., McQuillin A., Bass N., McIntosh A., Blackwood D., Johnstone M., Palotie A., Pato M.T., Pato C.N., Bromet E.J., Carvalho C.B., Achtyes E.D., Azevedo M.H., Kotov R., Lehrer D.S., Malaspina D., Marder S.R., Medeiros H., Morley C.P., Perkins D.O., Sobell J.L., Buckley P.F., Macciardi F., Rapaport M.H., Knowles J.A., Fanous A.H., McCarroll S.A., Gupta N., Gabriel S.B., Daly M.J., Lander E.S., Lowenstein D.H., Goldstein D.B., Lerche H., Berkovic S.F., Neale B.M., Epi25 Collaborative, YÜCESAN, EMRAH, Institute for Molecular Medicine Finland, Children's Hospital, HUS Children and Adolescents, Department of Medical and Clinical Genetics, University Management, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, and Genomics of Neurological and Neuropsychiatric Disorders

Subjects
s.berkovic@unimelb.edu.au [Epi25 Collaborative. Electronic address], 0301 basic medicine, GAMMA-2-SUBUNIT, burden analysi, DNA Mutational Analysis, PROTEIN, Neurodegenerative, VARIANTS, SUSCEPTIBILITY, Medical and Health Sciences, Epilepsy, 0302 clinical medicine, 2.1 Biological and endogenous factors, EPIDEMIOLOGY, Missense mutation, Exome, Aetiology, Genetics (clinical), Exome sequencing, 11 Medical and Health Sciences, seizures, GABRG2, Genetics, Genetics & Heredity, 0303 health sciences, biology, COMMON EPILEPSIES, 1184 Genetics, developmental biology, physiology, sequencing, Biological Sciences, Epi25 Collaborative, Phenotype, GENOME, epileptic encephalopathy, burden analysis, Neurological, Biotechnology, Genetic Markers, seizure, EEF1A2, Burden analysis, epilepsy, exome, Article, 03 medical and health sciences, Clinical Research, Exome Sequencing, Genetic variation, medicine, Humans, Genetic Predisposition to Disease, Gene, EPILEPTIC SEIZURES, METAANALYSIS, 030304 developmental biology, Human Genome, Neurosciences, Genetic Variation, 06 Biological Sciences, medicine.disease, Brain Disorders, 030104 developmental biology, Genetic marker, DE-NOVO MUTATIONS, Case-Control Studies, biology.protein, 3111 Biomedicine, Human medicine, 030217 neurology & neurosurgery
Abstract

Sequencing-based studies have identified novel risk genes for rare, severe epilepsies and revealed a role of rare deleterious variation in common epilepsies. To identify the shared and distinct ultra-rare genetic risk factors for rare and common epilepsies, we performed a whole-exome sequencing (WES) analysis of 9,170 epilepsy-affected individuals and 8,364 controls of European ancestry. We focused on three phenotypic groups; the rare but severe developmental and epileptic encephalopathies (DEE), and the commoner phenotypes of genetic generalized epilepsy (GGE) and non-acquired focal epilepsy (NAFE). We observed that compared to controls, individuals with any type of epilepsy carried an excess of ultra-rare, deleterious variants in constrained genes and in genes previously associated with epilepsy, with the strongest enrichment seen in DEE and the least in NAFE. Moreover, we found that inhibitory GABAA receptor genes were enriched for missense variants across all three classes of epilepsy, while no enrichment was seen in excitatory receptor genes. The larger gene groups for the GABAergic pathway or cation channels also showed a significant mutational burden in DEE and GGE. Although no single gene surpassed exome-wide significance among individuals with GGE or NAFE, highly constrained genes and genes encoding ion channels were among the top associations, including CACNA1G, EEF1A2, and GABRG2 for GGE and LGI1, TRIM3, and GABRG2 for NAFE. Our study confirms a convergence in the genetics of common and rare epilepsies associated with ultra-rare coding variation and highlights a ubiquitous role for GABAergic inhibition in epilepsy etiology in the largest epilepsy WES study to date.

Published
2019
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18. UBTF Mutation Causes Complex Phenotype of Neurodegeneration and Severe Epilepsy in Childhood

Author

Jana Neupauerová, Pavel Seeman, David Staněk, Lucie Sedlackova, Jana Haberlová, Emílie Vyhnálková, Pavel Krsek, Petra Laššuthová, Marie Šedivá, and Katalin Štěrbová

Subjects
0301 basic medicine, Male, Candidate gene, Drug Resistant Epilepsy, Adolescent, Disease, 030105 genetics & heredity, Bioinformatics, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Intellectual disability, medicine, Missense mutation, Humans, Exome sequencing, business.industry, Neurodegeneration, Neurodegenerative Diseases, General Medicine, medicine.disease, Phenotype, Pediatrics, Perinatology and Child Health, Mutation, Neurology (clinical), business, Pol1 Transcription Initiation Complex Proteins, 030217 neurology & neurosurgery
Abstract

Introduction Neurodegenerative diseases of childhood present with progressive decline in cognitive, social, and motor function and are frequently associated with seizures in different stages of the disease. Here we report a patient with severe progressive neurodegeneration with drug-resistant epilepsy of unknown etiology from the age of 2 years. Methods and Results Using whole exome sequencing, we found heterozygous missense de novo variant c.628G > A (p.Glu210Lys) in the UBTF gene. This variant was recently described as de novo in 11 patients with similar neurodegeneration characterized by developmental decline initially confined to motor development followed by language regression, appearance of an extrapyramidal movement disorder, and leading to severe intellectual disability. In 3 of the 11 patients described so far, seizures were also present. Conclusions Our report expands the complex phenotype of neurodegeneration associated with the c.628G > A variant in the UBTF gene and helps to clarify the relation between this one single recurrent pathogenic variant described in this gene to date and its phenotype. The UBTF gene should be considered a novel candidate gene in neurodegeneration with or without epilepsy.

Published
2018

19. Neonatal Onset of Epilepsy of Infancy with Migrating Focal Seizures Associated with a Novel GABRB3 Variant in Monozygotic Twins

Author

Petr Klement, David Staněk, Katalin Štěrbová, Hana Zůnová, Marketa Vlckova, Jana Neupauerová, Pavel Seeman, and Petra Laššuthová

Subjects
0301 basic medicine, Proband, Neonatal onset, medicine.disease_cause, 03 medical and health sciences, Epilepsy, symbols.namesake, 0302 clinical medicine, medicine, Diseases in Twins, Humans, Age of Onset, Genetics, Sanger sequencing, Mutation, Massive parallel sequencing, business.industry, Infant, Newborn, Infant, General Medicine, Twins, Monozygotic, medicine.disease, Receptors, GABA-A, Hypotonia, 030104 developmental biology, Pediatrics, Perinatology and Child Health, symbols, Female, Neurology (clinical), medicine.symptom, Age of onset, business, 030217 neurology & neurosurgery
Abstract

Background Recently, a study providing insight into GABRB3 mutational spectrum was published (Møller et al 2017). The authors report considerable pleiotropy even for single mutations and were not able to identify any genotype–phenotype correlations. Methods The proband (twin B) was referred for massively parallel sequencing of epilepsy-related gene panel because of hypotonia and neonatal seizures. The revealed variant was confirmed with Sanger sequencing in the proband and the twin A, and both parents were tested for the presence of the variant. Results We report a case of epilepsy of infancy with migrating focal seizures (EIMFS) of neonatal onset in monozygotic twins with a de novo novel GABRB3 variant p.Thr281Ala. The variant has a uniform presentation on an identical genomic background. In addition, early seizure-onset epilepsy associated with GABRB3 mutation has been until now described only for the p.Leu256Gln variant in the GABRB3 (Møller et al 2017, Myers et al 2016) located in the transmembrane domain just as the p.Thr281Ala variant described here. Conclusion De novo GABRB3 mutations may cause neonatal-onset EIMFS with early-onset hypotonia, respiratory distress, and severe developmental delay.

Published
2018

20. Two Novel Variants Affecting CDKL5 Transcript Associated with Epileptic Encephalopathy

Author

Markéta Žaliová, Věra Sebroňová, Staněk David, Jana Neupauerová, Pavel Seeman, Tat’ána Maříková, Pavel Krsek, Marcela Krůtová, Katalin Štěrbová, Petra Laššuthová, and Marketa Vlckova

Subjects
0301 basic medicine, Male, CDKL5, 030105 genetics & heredity, Biology, Protein Serine-Threonine Kinases, Bioinformatics, DNA sequencing, 03 medical and health sciences, Epilepsy, symbols.namesake, 0302 clinical medicine, medicine, Rett Syndrome, Humans, Gene, Genetics (clinical), Genetics, Sanger sequencing, Massive parallel sequencing, Genetic Variation, High-Throughput Nucleotide Sequencing, General Medicine, Exons, medicine.disease, Hypotonia, Child, Preschool, RNA splicing, Mutation, symbols, Female, medicine.symptom, Epileptic Syndromes, Spasms, Infantile, 030217 neurology & neurosurgery
Abstract

Variants in the human X-linked cyclin-dependent kinase-like 5 (CDKL5) gene have been reported as being etiologically associated with early infantile epileptic encephalopathy type 2 (EIEE2). We report on two patients, a boy and a girl, with EIEE2 that present with early onset epilepsy, hypotonia, severe intellectual disability, and poor eye contact.Massively parallel sequencing (MPS) of a custom-designed gene panel for epilepsy and epileptic encephalopathy containing 112 epilepsy-related genes was performed. Sanger sequencing was used to confirm the novel variants. For confirmation of the functional consequence of an intronic CDKL5 variant in patient 2, an RNA study was done.DNA sequencing revealed de novo variants in CDKL5, a c.2578CT (p. Gln860*) present in a hemizygous state in a 3-year-old boy, and a potential splice site variant c.463+5GA in heterozygous state in a 5-year-old girl. Multiple in silico splicing algorithms predicted a highly reduced splice site score for c.463+5GA. A subsequent mRNA study confirmed an aberrant shorter transcript lacking exon 7.Our data confirmed that variants in the CDKL5 are associated with EIEE2. There is credible evidence that the novel identified variants are pathogenic and, therefore, are likely the cause of the disease in the presented patients. In one of the patients a stop codon variant is predicted to produce a truncated protein, and in the other patient an intronic variant results in aberrant splicing.

Published
2017

21. KCNQ2 Mutation Explains the Etiology of Chloral Hydrate–Responsive Ohtahara Syndrome

Author

Michal Beran, Jana Neupauerová, Pavel Seeman, Katalin Štěrbová, Petra Laššuthová, Ivana Pernikova, and Pavel Krsek

Subjects
0301 basic medicine, Genetics, Ohtahara syndrome, business.industry, Chloral hydrate, medicine.disease, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, Developmental Neuroscience, Neurology, Pediatrics, Perinatology and Child Health, Mutation (genetic algorithm), Etiology, Medicine, Neurology (clinical), business, 030217 neurology & neurosurgery, medicine.drug
Published
2017
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22. Postnatal hypobaric hypoxia in rats impairs water maze learning and the morphology of neurones and macroglia in cortex and hippocampus

Author

Z. Simonova, Katalin Štěrbová, Gustav Brožek, Eva Syková, and Vladimir Komarek

Subjects
Neurofilament, Central nervous system, Morris water navigation task, Cell Count, Water maze, Biology, Auditory cortex, Somatosensory system, Hippocampus, Behavioral Neuroscience, Nerve Fibers, Memory, Glial Fibrillary Acidic Protein, medicine, Image Processing, Computer-Assisted, Animals, Rats, Wistar, Hypoxia, Maze Learning, Cerebral Cortex, Neurons, Body Weight, Rats, Oligodendroglia, medicine.anatomical_structure, Atmospheric Pressure, Animals, Newborn, Neuroscience, Neuroglia, Immunostaining, Motor cortex
Abstract

Newborn rats were exposed to intermittent hypobaric hypoxia from birth until the age of 19 days. Spatial memory was tested in a Morris water maze from postnatal day (P) 23 to P32 and from P100 to P109. From P24 to P27 and on days P100 and P101, the escape latencies of hypoxic animals were longer than those of controls. At P24, the number of neuronal bodies increased in cortical layer II of the somatosensory, motor, and auditory areas, and in layer V of the motor area, but the number of neuronal bodies throughout the whole cortical thickness was unchanged. Decreases in the immunostaining density for neurofilaments (anti-NF 160), astrocytes (anti-GFAP), and oligodendrocytes (RIP) were found in the hippocampus, and the typical parallel organisation of neuronal and macroglial processes was lost. Decreases in immunostaining for neurofilaments and oligodendrocytes were also found in the somatosensory cortex and motor cortex. In adult hypoxic rats, at P114-P240, the number of neuronal bodies and the immunostaining density for neurofilaments, astrocytes, and oligodendrocytes in the examined areas were similar to adult controls; however, in the hippocampus we found hypertrophy of fine astrocytic processes and a decreased number of oligodendrocytic processes. We conclude that the neonatal brain damage induced by hypobaric hypoxia impairs spatial memory in infant as well as adult rats. Hypobaric hypoxia delays the maturation of neurones and substantially affects macroglia in the cortex and hippocampus.

Published
2003

23. Synchronization as adjustment of information rates: detection from bivariate time series

Author

Milan Paluš, Zbyněk Hrnčíř, Vladimir Komarek, and Katalin Štěrbová

Subjects
Quantitative Biology::Neurons and Cognition, Series (mathematics), Control theory, Chaotic systems, Computer science, Physics::Medical Physics, Information flow, Bivariate analysis, Tomography, Time series, Algorithm, Synchronization
Abstract

An information-theoretic approach for studying synchronization phenomena in experimental bivariate time series is presented. "Coarse-grained" information rates are introduced and their ability to indicate generalized synchronization as well as to establish a "direction of information flow" between coupled systems, i.e., to discern the driving from the driven (response) system, is demonstrated using numerically generated time series from unidirectionally coupled chaotic systems. The method introduced is then applied in a case study of electroencephalogram recordings of an epileptic patient. Synchronization events leading to seizures have been found on two levels of organization of brain tissues and "directions of information flow" among brain areas have been identified. This allows localization of the primary epileptogenic areas, also confirmed by magnetic resonance imaging and pasitron emission tomography scans.

Published
2000

24. Analysis of 31-year-old patient with SYNGAP1 gene defect points to importance of variants in broader splice regions and reveals developmental trajectory of SYNGAP1-associated phenotype: case report

Author

Darina Prchalova, Marketa Havlovicova, Katalin Sterbova, Viktor Stranecky, Miroslava Hancarova, and Zdenek Sedlacek

Subjects
SYNGAP1 gene, Intellectual disability, Epilepsy, Splice mutation, Splice region, Whole exome sequencing, Internal medicine, RC31-1245, Genetics, QH426-470
Abstract

Abstract Background Whole exome sequencing is a powerful tool for the analysis of genetically heterogeneous conditions. The prioritization of variants identified often focuses on nonsense, frameshift and canonical splice site mutations, and highly deleterious missense variants, although other defects can also play a role. The definition of the phenotype range and course of rare genetic conditions requires long-term clinical follow-up of patients. Case presentation We report an adult female patient with severe intellectual disability, severe speech delay, epilepsy, autistic features, aggressiveness, sleep problems, broad-based clumsy gait and constipation. Whole exome sequencing identified a de novo mutation in the SYNGAP1 gene. The variant was located in the broader splice donor region of intron 10 and replaced G by A at position +5 of the splice site. The variant was predicted in silico and shown experimentally to abolish the regular splice site and to activate a cryptic donor site within exon 10, causing frameshift and premature termination. The overall clinical picture of the patient corresponded well with the characteristic SYNGAP1-associated phenotype observed in previously reported patients. However, our patient was 31 years old which contrasted with most other published SYNGAP1 cases who were much younger. Our patient had a significant growth delay and microcephaly. Both features normalised later, although the head circumference stayed only slightly above the lower limit of the norm. The patient had a delayed puberty. Her cognitive and language performance remained at the level of a one-year-old child even in adulthood and showed a slow decline. Myopathic facial features and facial dysmorphism became more pronounced with age. Although the gait of the patient was unsteady in childhood, more severe gait problems developed in her teens. While the seizures remained well-controlled, her aggressive behaviour worsened with age and required extensive medication. Conclusions The finding in our patient underscores the notion that the interpretation of variants identified using whole exome sequencing should focus not only on variants in the canonical splice dinucleotides GT and AG, but also on broader splice regions. The long-term clinical follow-up of our patient contributes to the knowledge of the developmental trajectory in individuals with SYNGAP1 gene defects.

Published
2017
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