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1. Contrasting responses of naturalized alien and native plants to native soil biota and drought.

Author

Ruppert, Hannah K., van Kleunen, Mark, and Wilschut, Rutger A.

Subjects
*INTRODUCED plants, *NATIVE species, *PLANT performance, *VESICULAR-arbuscular mycorrhizas, *PLANT biomass
Abstract

Terrestrial plant communities often become invaded by alien species, which may benefit from high growth rates, strong phenotypic plasticity and reduced negative impacts from local soil communities. At the same time, terrestrial communities are increasingly more often exposed to periods of drought. However, how drought affects the competition between alien and native plants directly, and indirectly, through changing impacts of soil communities on plant performance, remains poorly understood.Here, we performed a greenhouse pot experiment in which we examined biomass responses of five native and five naturalized alien species (all occurring in mesic grasslands) to drought and benign soil moisture conditions, while growing in interspecific, intraspecific or absence of competition, in the presence or absence of native soil biota. We expected that alien plant species are less negatively affected by soil biota, but more negatively affected by drought than native species, and that drought indirectly weakens soil‐community‐driven competitive benefits of alien plant species over native ones.On average, soil‐community effects on plant biomass were positive, but native performance was less positively affected by soil communities than alien performance, suggesting reduced impacts of soil‐borne enemies on alien plants. Drought more negatively affected alien‐ than native plant performance. Drought impacts on plant biomass did not depend on soil community presence, but in the presence of soil biota, plants overall invested more in root biomass when exposed to drought. The effects of competition were subtle and species‐specific.To better understand the observed positive soil‐community effects on plant performance in our study, we examined mycorrhizal root colonization of plants grown in absence of competition. Among‐species variation in mycorrhizal colonization explained plant performance differences between soils with and without live soil communities, indicating a key role for arbuscular mycorrhizal fungi as driver of plant performance. However, mycorrhizal colonization did not differ between alien and native plants and was unaffected by drought.Overall, our study suggests that drought may weaken alien plant invasions through stronger direct negative impacts on alien than on native plant performance, but that drought does not affect soil‐biota‐driven differences in plant performance between alien and native plants. Read the free Plain Language Summary for this article on the Journal blog. [ABSTRACT FROM AUTHOR]

Published
2024
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2. mGlu3 metabotropic glutamate receptors as a target for the treatment of absence epilepsy: Preclinical and human genetics data

Author

Celli, R., Striano, P., Citraro, R., Di Menna, L., Cannella, M., Imbriglio, T., Koko, M., De Sarro, G., Monn, J. A., Battaglia, G., van Luijtelaar, G., Nicoletti, F., Russo, E., Leo, A., Palotie, A., Folkhalsan, A. -E. L., Ruppert, A. -K., Lal, D., Thiele, H., Altmuller, J., Jabbari, K., Nurnberg, P., Sander, T., Siren, A., Becker, F., Lerche, H., Weber, Y., Koeleman, B., Caglayan, H., Hjalgrim, H., Moller, R., Muhle, H., Helbig, I., Everett, K., May, P., Krause, R., Balling, R., Nabbout, R., Zara, F., Scala, M., Iacomino, M., Scudieri, P., Bocciardi, R., Balagura, G., Minetti, C., Riva, A., Vari, M. S., Amadori, E., Perinelli, M., Verrotti, A., Baulac, S., and Kunz, W.

Subjects
gaba, Pharmacology, cortico-thalamo-cortical network, Action, intention, and motor control, human genetics, glutamate, General Medicine, absence epilepsy, eeg, mglu3 receptors, Psychiatry and Mental health, Neurology, Pharmacology (medical), Neurology (clinical)
Abstract

Background: Previous studies suggest that different metabotropic glutamate (mGlu) receptor subtypes are potential drug targets for the treatment of absence epilepsy. However, no information is available on mGlu3 receptors. Objective: To examine whether (i) abnormalities changes of mGlu3 receptor expression/signaling are found in the somatosensory cortex and thalamus of WAG/Rij rats developing spontaneous absence seizures; (ii) selective activation of mGlu3 receptors with LY2794193 affects the number and duration of spike-wave discharges (SWDs) in WAG/Rij rats; and (iii) a genetic variant of GRM3 (encoding the mGlu3 receptor) is associated with absence epilepsy. Methods: Animals: immunoblot analysis of mGlu3 receptors, GAT-1, GLAST, and GLT-1; real-time PCR analysis of mGlu3 mRNA levels; assessment of mGlu3 receptor signaling; EEG analysis of SWDs; assessment of depressive-like behavior. Humans: search for GRM3 and GRM5 missense variants in 196 patients with absence epilepsy or other IGE/GGE Idiopathic Generalized Epilepsy (IGE)/ Genetic Generalized Epilepsy (GGE) and 125,748 controls. Results: mGlu3 protein levels and mGlu3-mediated inhibition of cAMP formation were reduced in the thalamus and somatosensory cortex of pre-symptomatic (25-27 days old) and symptomatic (6-7 months old) WAG/Rij rats compared to age-matched controls. Treatment with LY2794193 (1 or 10 mg/kg, i.p.) reduced absence seizures and depressive-like behavior in WAG/Rij rats. LY2794193 also enhanced GAT1, GLAST, and GLT-1 protein levels in the thalamus and somatosensory cortex. GRM3 and GRM5 gene variants did not differ between epileptic patients and controls. Conclusions: We suggest that mGlu3 receptors modulate the activity of the cortico-thalamo-cortical circuit underlying SWDs and that selective mGlu3 receptor agonists are promising candidate drugs for absence epilepsy treatment.

Published
2023

3. Defending the polygon: the emerging human right to communal property.

Author

Ankersen, Thomas T. and Ruppert, Thomas K.

Subjects
Right of property -- Laws, regulations and rules, Human rights -- Laws, regulations and rules, Land tenure -- Laws, regulations and rules, Common lands -- Laws, regulations and rules, Government regulation
Published
2006

5. No evidence for a BRD2 promoter hypermethylation inblood leukocytes of Europeans with juvenile myoclonic epilepsy

Author

Schulz, H, Ruppert, A-K, Zara, F, Madia, F, Iacomino, M, Vari, MS, Balagura, G, Minetti, C, Striano, P, Blanche, A, Marini, C, Guerrini, R, Weber, YG, Becker, F, Lerche, H, Kapser, C, Schankin, CJ, Kunz, WS, Moller, RS, Oliver, KL, Bellows, ST, Mullen, SA, Berkovic, SF, Scheffer, IE, Caglayan, H, Ozbek, U, Hoffmann, P, Schramm, S, Tsortouktzidis, D, Becker, AJ, Sander, T, Schulz, H, Ruppert, A-K, Zara, F, Madia, F, Iacomino, M, Vari, MS, Balagura, G, Minetti, C, Striano, P, Blanche, A, Marini, C, Guerrini, R, Weber, YG, Becker, F, Lerche, H, Kapser, C, Schankin, CJ, Kunz, WS, Moller, RS, Oliver, KL, Bellows, ST, Mullen, SA, Berkovic, SF, Scheffer, IE, Caglayan, H, Ozbek, U, Hoffmann, P, Schramm, S, Tsortouktzidis, D, Becker, AJ, and Sander, T

Abstract

Juvenile myoclonic epilepsy (JME) is a common syndrome of genetic generalized epilepsies (GGEs). Linkage and association studies suggest that the gene encoding the bromodomain-containing protein 2 (BRD2) may increase risk of JME. The present methylation and association study followed up a recent report highlighting that the BRD2 promoter CpG island (CpG76) is differentially hypermethylated in lymphoblastoid cells from Caucasian patients with JME compared to patients with other GGE subtypes and unaffected relatives. In contrast, we found a uniform low average percentage of methylation (<4.5%) for 13 CpG76-CpGs in whole blood cells from 782 unrelated European Caucasians, including 116 JME patients, 196 patients with genetic absence epilepsies, and 470 control subjects. We also failed to confirm an allelic association of the BRD2 promoter single nucleotide polymorphism (SNP) rs3918149 with JME (Armitage trend test, P = 0.98), and we did not detect a substantial impact of SNP rs3918149 on CpG76 methylation in either 116 JME patients (methylation quantitative trait loci [meQTL], P = 0.29) or 470 German control subjects (meQTL, P = 0.55). Our results do not support the previous observation that a high DNA methylation level of the BRD2 promoter CpG76 island is a prevalent epigenetic motif associated with JME in Caucasians.

Published
2019

6. Analysis of shared heritability in common disorders of the brain

Author

Anttila, V. Bulik-Sullivan, B. Finucane, H.K. Walters, R.K. Bras, J. Duncan, L. Escott-Price, V. Falcone, G.J. Gormley, P. Malik, R. Patsopoulos, N.A. Ripke, S. Wei, Z. Yu, D. Lee, P.H. Turley, P. Grenier-Boley, B. Chouraki, V. Kamatani, Y. Berr, C. Letenneur, L. Hannequin, D. Amouyel, P. Boland, A. Deleuze, J.-F. Duron, E. Vardarajan, B.N. Reitz, C. Goate, A.M. Huentelman, M.J. Ilyas Kamboh, M. Larson, E.B. Rogaeva, E. George-Hyslop, P.S. Hakonarson, H. Kukull, W.A. Farrer, L.A. Barnes, L.L. Beach, T.G. Yesim Demirci, F. Head, E. Hulette, C.M. Jicha, G.A. Kauwe, J.S.K. Kaye, J.A. Leverenz, J.B. Levey, A.I. Lieberman, A.P. Pankratz, V.S. Poon, W.W. Quinn, J.F. Saykin, A.J. Schneider, L.S. Smith, A.G. Sonnen, J.A. Stern, R.A. Van Deerlin, V.M. Van Eldik, L.J. Harold, D. Russo, G. Rubinsztein, D.C. Bayer, A. Tsolaki, M. Proitsi, P. Fox, N.C. Hampel, H. Owen, M.J. Mead, S. Passmore, P. Morgan, K. Nöthen, M.M. Rossor, M. Lupton, M.K. Hoffmann, P. Kornhuber, J. Lawlor, B. McQuillin, A. Al-Chalabi, A. Bis, J.C. Ruiz, A. Boada, M. Seshadri, S. Beiser, A. Rice, K. Van Der Lee, S.J. De Jager, P.L. Geschwind, D.H. Riemenschneider, M. Riedel-Heller, S. Rotter, J.I. Ransmayr, G. Hyman, B.T. Cruchaga, C. Alegret, M. Winsvold, B. Palta, P. Farh, K.-H. Cuenca-Leon, E. Furlotte, N. Kurth, T. Ligthart, L. Terwindt, G.M. Freilinger, T. Ran, C. Gordon, S.D. Borck, G. Adams, H.H.H. Lehtimäki, T. Wedenoja, J. Buring, J.E. Schürks, M. Hrafnsdottir, M. Hottenga, J.-J. Penninx, B. Artto, V. Kaunisto, M. Vepsäläinen, S. Martin, N.G. Montgomery, G.W. Kurki, M.I. Hämäläinen, E. Huang, H. Huang, J. Sandor, C. Webber, C. Muller-Myhsok, B. Schreiber, S. Salomaa, V. Loehrer, E. Göbel, H. Macaya, A. Pozo-Rosich, P. Hansen, T. Werge, T. Kaprio, J. Metspalu, A. Kubisch, C. Ferrari, M.D. Belin, A.C. Van Den Maagdenberg, A.M.J.M. Zwart, J.-A. Boomsma, D. Eriksson, N. Olesen, J. Chasman, D.I. Nyholt, D.R. Avbersek, A. Baum, L. Berkovic, S. Bradfield, J. Buono, R. Catarino, C.B. Cossette, P. De Jonghe, P. Depondt, C. Dlugos, D. Ferraro, T.N. French, J. Hjalgrim, H. Jamnadas-Khoda, J. Kälviäinen, R. Kunz, W.S. Lerche, H. Leu, C. Lindhout, D. Lo, W. Lowenstein, D. McCormack, M. Møller, R.S. Molloy, A. Ng, P.-W. Oliver, K. Privitera, M. Radtke, R. Ruppert, A.-K. Sander, T. Schachter, S. Schankin, C. Scheffer, I. Schoch, S. Sisodiya, S.M. Smith, P. Sperling, M. Striano, P. Surges, R. Neil Thomas, G. Visscher, F. Whelan, C.D. Zara, F. Heinzen, E.L. Marson, A. Becker, F. Stroink, H. Zimprich, F. Gasser, T. Gibbs, R. Heutink, P. Martinez, M. Morris, H.R. Sharma, M. Ryten, M. Mok, K.Y. Pulit, S. Bevan, S. Holliday, E. Attia, J. Battey, T. Boncoraglio, G. Thijs, V. Chen, W.-M. Mitchell, B. Rothwell, P. Sharma, P. Sudlow, C. Vicente, A. Markus, H. Kourkoulis, C. Pera, J. Raffeld, M. Silliman, S. Perica, V.B. Thornton, L.M. Huckins, L.M. William Rayner, N. Lewis, C.M. Gratacos, M. Rybakowski, F. Keski-Rahkonen, A. Raevuori, A. Hudson, J.I. Reichborn-Kjennerud, T. Monteleone, P. Karwautz, A. Mannik, K. Baker, J.H. O'Toole, J.K. Trace, S.E. Davis, O.S.P. Helder, S.G. Ehrlich, S. Herpertz-Dahlmann, B. Danner, U.N. Van Elburg, A.A. Clementi, M. Forzan, M. Docampo, E. Lissowska, J. Hauser, J. Tortorella, A. Maj, M. Gonidakis, F. Tziouvas, K. Papezova, H. Yilmaz, Z. Wagner, G. Cohen-Woods, S. Herms, S. Julia, A. Rabionet, R. Dick, D.M. Ripatti, S. Andreassen, O.A. Espeseth, T. Lundervold, A.J. Steen, V.M. Pinto, D. Scherer, S.W. Aschauer, H. Schosser, A. Alfredsson, L. Padyukov, L. Halmi, K.A. Mitchell, J. Strober, M. Bergen, A.W. Kaye, W. Szatkiewicz, J.P. Cormand, B. Ramos-Quiroga, J.A. Sánchez-Mora, C. Ribasés, M. Casas, M. Hervas, A. Arranz, M.J. Haavik, J. Zayats, T. Johansson, S. Williams, N. Dempfle, A. Rothenberger, A. Kuntsi, J. Oades, R.D. Banaschewski, T. Franke, B. Buitelaar, J.K. Vasquez, A.A. Doyle, A.E. Reif, A. Lesch, K.-P. Freitag, C. Rivero, O. Palmason, H. Romanos, M. Langley, K. Rietschel, M. Witt, S.H. Dalsgaard, S. Børglum, A.D. Waldman, I. Wilmot, B. Molly, N. Bau, C.H.D. Crosbie, J. Schachar, R. Loo, S.K. McGough, J.J. Grevet, E.H. Medland, S.E. Robinson, E. Weiss, L.A. Bacchelli, E. Bailey, A. Bal, V. Battaglia, A. Betancur, C. Bolton, P. Cantor, R. Celestino-Soper, P. Dawson, G. De Rubeis, S. Duque, F. Green, A. Klauck, S.M. Leboyer, M. Levitt, P. Maestrini, E. Mane, S. Moreno-De-Luca, D. Parr, J. Regan, R. Reichenberg, A. Sandin, S. Vorstman, J. Wassink, T. Wijsman, E. Cook, E. Santangelo, S. Delorme, R. Roge, B. Magalhaes, T. Arking, D. Schulze, T.G. Thompson, R.C. Strohmaier, J. Matthews, K. Melle, I. Morris, D. Blackwood, D. McIntosh, A. Bergen, S.E. Schalling, M. Jamain, S. Maaser, A. Fischer, S.B. Reinbold, C.S. Fullerton, J.M. Guzman-Parra, J. Mayoral, F. Schofield, P.R. Cichon, S. Mühleisen, T.W. Degenhardt, F. Schumacher, J. Bauer, M. Mitchell, P.B. Gershon, E.S. Rice, J. Potash, J.B. Zandi, P.P. Craddock, N. Nicol Ferrier, I. Alda, M. Rouleau, G.A. Turecki, G. Ophoff, R. Pato, C. Anjorin, A. Stahl, E. Leber, M. Czerski, P.M. Cruceanu, C. Jones, I.R. Posthuma, D. Andlauer, T.F.M. Forstner, A.J. Streit, F. Baune, B.T. Air, T. Sinnamon, G. Wray, N.R. MacIntyre, D.J. Porteous, D. Homuth, G. Rivera, M. Grove, J. Middeldorp, C.M. Hickie, I. Pergadia, M. Mehta, D. Smit, J.H. Jansen, R. De Geus, E. Dunn, E. Li, Q.S. Nauck, M. Schoevers, R.A. Beekman, A.T.F. Knowles, J.A. Viktorin, A. Arnold, P. Barr, C.L. Bedoya-Berrio, G. Joseph Bienvenu, O. Brentani, H. Burton, C. Camarena, B. Cappi, C. Cath, D. Cavallini, M. Cusi, D. Darrow, S. Denys, D. Derks, E.M. Dietrich, A. Fernandez, T. Figee, M. Freimer, N. Gerber, G. Grados, M. Greenberg, E. Hanna, G.L. Hartmann, A. Hirschtritt, M.E. Hoekstra, P.J. Huang, A. Huyser, C. Illmann, C. Jenike, M. Kuperman, S. Leventhal, B. Lochner, C. Lyon, G.J. Macciardi, F. Madruga-Garrido, M. Malaty, I.A. Maras, A. McGrath, L. Miguel, E.C. Mir, P. Nestadt, G. Nicolini, H. Okun, M.S. Pakstis, A. Paschou, P. Piacentini, J. Pittenger, C. Plessen, K. Ramensky, V. Ramos, E.M. Reus, V. Richter, M.A. Riddle, M.A. Robertson, M.M. Roessner, V. Rosário, M. Samuels, J.F. Sandor, P. Stein, D.J. Tsetsos, F. Van Nieuwerburgh, F. Weatherall, S. Wendland, J.R. Wolanczyk, T. Worbe, Y. Zai, G. Goes, F.S. McLaughlin, N. Nestadt, P.S. Grabe, H.-J. Depienne, C. Konkashbaev, A. Lanzagorta, N. Valencia-Duarte, A. Bramon, E. Buccola, N. Cahn, W. Cairns, M. Chong, S.A. Cohen, D. Crespo-Facorro, B. Crowley, J. Davidson, M. DeLisi, L. Dinan, T. Donohoe, G. Drapeau, E. Duan, J. Haan, L. Hougaard, D. Karachanak-Yankova, S. Khrunin, A. Klovins, J. Kučinskas, V. Keong, J.L.C. Limborska, S. Loughland, C. Lönnqvist, J. Maher, B. Mattheisen, M. McDonald, C. Murphy, K.C. Nenadic, I. Van Os, J. Pantelis, C. Pato, M. Petryshen, T. Quested, D. Roussos, P. Sanders, A.R. Schall, U. Schwab, S.G. Sim, K. So, H.-C. Stögmann, E. Subramaniam, M. Toncheva, D. Waddington, J. Walters, J. Weiser, M. Cheng, W. Cloninger, R. Curtis, D. Gejman, P.V. Henskens, F. Mattingsdal, M. Oh, S.-Y. Scott, R. Webb, B. Breen, G. Churchhouse, C. Bulik, C.M. Daly, M. Dichgans, M. Faraone, S.V. Guerreiro, R. Holmans, P. Kendler, K.S. Koeleman, B. Mathews, C.A. Price, A. Scharf, J. Sklar, P. Williams, J. Wood, N.W. Cotsapas, C. Palotie, A. Smoller, J.W. Sullivan, P. Rosand, J. Corvin, A. Neale, B.M. The Brainstorm Consortium

Abstract

Disorders of the brain can exhibit considerable epidemiological comorbidity and often share symptoms, provoking debate about their etiologic overlap. We quantified the genetic sharing of 25 brain disorders from genome-wide association studies of 265,218 patients and 784,643 control participants and assessed their relationship to 17 phenotypes from 1,191,588 individuals. Psychiatric disorders share common variant risk, whereas neurological disorders appear more distinct from one another and from the psychiatric disorders. We also identified significant sharing between disorders and a number of brain phenotypes, including cognitive measures. Further, we conducted simulations to explore how statistical power, diagnostic misclassification, and phenotypic heterogeneity affect genetic correlations. These results highlight the importance of common genetic variation as a risk factor for brain disorders and the value of heritability-based methods in understanding their etiology. © 2018 American Association for the Advancement of Science. All rights reserved.

Published
2018

7. Evaluation of Presumably Disease Causing SCN1A Variants in a Cohort of Common Epilepsy Syndromes

Author

Lal, D., Reinthaler, E. M., Dejanovic, B., May, P., Thiele, H., Lehesjoki, A. . E., Schwarz, G., Riesch, E., Ikram, M. A., Van Duijn, C. M., Uitterlinden, A. G., Hofman, A., Steinböck, H., Gruber sedlmayr, U., Neophytou, B., Zara, F., Hahn, A., Gormley, P., Becker, F., Weber, Y. G., Cilio, M. R., Kunz, W. S., Krause, R., Zimprich, F., Lemke, J. R., Nürnberg, P., Sander, T., Lerche, H., Neubauer, B. A., Palotie, A., Ruppert, A. K., Suls, A., Siren, A., Koeleman, B., Haberlandt, E., Ronen, G. M., Caglayan, H., Hjalgrim, H., Muhle, H., Schulz, H., Helbig, I., Altmüller, J., Geldner, J., Schubert, J., Jabbari, K., Everett, K., Feucht, M., Balestri, M., Nothnagel, M., Striano, Pasquale, Møller, R. S., Nabbout, R., Balling, R., Baulac, S., Bianchi, A., La Neve, A., Minetti, Carlo, Giuseppe, C., Neuroscience Center, Research Programs Unit, Anna-Elina Lehesjoki / Principal Investigator, Research Programme for Molecular Neurology, Institute for Molecular Medicine Finland, Aarno Palotie / Principal Investigator, Genomics of Neurological and Neuropsychiatric Disorders, Epidemiology, Neurology, Radiology & Nuclear Medicine, Internal Medicine, Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], and Luxembourg Centre for Systems Biomedicine (LCSB): Experimental Neurobiology (Balling Group) [research center]

Subjects
0301 basic medicine, Male, Genetics and Molecular Biology (all), FEBRILE SEIZURES PLUS, Disease, Pathogenesis, Bioinformatics, Pathology and Laboratory Medicine, Biochemistry, Epilepsy, Database and Informatics Methods, 0302 clinical medicine, Risk Factors, Medicine and Health Sciences, Medicine, SCN1A, Myoclonic Seizures, NEURONAL SODIUM-CHANNEL, MUTATION, Multidisciplinary, SEVERE MYOCLONIC EPILEPSY, Research Support, Non-U.S. Gov't, Medicine (all), Syndrome, Clinical Trial, 3. Good health, PREVALENCE, Multicenter Study, Neurology, Cohort, Female, Genetics & genetic processes [F10] [Life sciences], Génétique & processus génétiques [F10] [Sciences du vivant], Sequence Analysis, DRAVET SYNDROME, Research Article, Science, Mutation, Missense, Amino Acid Substitution, Case-Control Studies, Humans, NAV1.1 Voltage-Gated Sodium Channel, Agricultural and Biological Sciences (all), Biochemistry, Genetics and Molecular Biology (all), GENERALIZED EPILEPSY, Sequence Databases, Research and Analysis Methods, ITALIAN PATIENTS, 03 medical and health sciences, Dravet syndrome, Journal Article, Genetics, HEMIPLEGIC MIGRAINE, Tonic-Clonic Seizures, Generalized epilepsy, Molecular Biology Techniques, Sequencing Techniques, Molecular Biology, business.industry, Case-control study, 3112 Neurosciences, Biology and Life Sciences, Human Genetics, Epileptic Seizures, medicine.disease, GENE, Human genetics, 030104 developmental biology, Biological Databases, Epilepsy syndromes, Mutation Databases, Genetics of Disease, 3111 Biomedicine, Missense, business, 030217 neurology & neurosurgery
Abstract

A. Palotie on työryhmän jäsen. Objective The SCN1A gene, coding for the voltage-gated Na+ channel alpha subunit NaV1.1, is the clinically most relevant epilepsy gene. With the advent of high-throughput next-generation sequencing, clinical laboratories are generating an ever-increasing catalogue of SCN1A variants. Variants are more likely to be classified as pathogenic if they have already been identified previously in a patient with epilepsy. Here, we critically re-evaluate the pathogenicity of this class of variants in a cohort of patients with common epilepsy syndromes and subsequently ask whether a significant fraction of benign variants have been misclassified as pathogenic. Methods We screened a discovery cohort of 448 patients with a broad range of common genetic epilepsies and 734 controls for previously reported SCN1A mutations that were assumed to be disease causing. We re-evaluated the evidence for pathogenicity of the identified variants using in silico predictions, segregation, original reports, available functional data and assessment of allele frequencies in healthy individuals as well as in a follow up cohort of 777 patients. Results and Interpretation We identified 8 known missense mutations, previously reported as pathogenic, in a total of 17 unrelated epilepsy patients (17/448; 3.80%). Our re-evaluation indicates that 7 out of these 8 variants (p.R27T; p.R28C; p.R542Q; p.R604H; p.T1250M; p.E1308D; p.R1928G; NP_001159435.1) are not pathogenic. Only the p. T1174S mutation may be considered as a genetic risk factor for epilepsy of small effect size based on the enrichment in patients (P = 6.60 x 10(-4); OR = 0.32, fishers exact test), previous functional studies but incomplete penetrance. Thus, incorporation of previous studies in genetic counseling of SCN1A sequencing results is challenging and may produce incorrect conclusions.

Published
2016
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8. Dropping the Ball

Author

Ruppert, Kevin K.

Subjects
NFL Network -- Marketing, Cable television broadcasting industry -- Marketing, Television broadcasting of sports -- Beliefs, opinions and attitudes, Company marketing practices, Business, Mass communications
Abstract

Staff Editor: I liked your suggestions for settling the rift between the NFL Network and the cable industry ('A Political Football,' Dec. 10). Being a Green Bay Packers fan, I, [...]

Published
2007

9. Evaluation of presumably disease causing SCN1A variants in a cohort of common epilepsy syndromes

Author

Lal, D. (Dennis), Reinthaler, E.M. (Eva M.), Dejanovic, B. (Borislav), May, P. (Patrick), Thiele, H. (Holger), Lehesjoki, A.E., Schwarz, G. (Günter), Riesch, E. (Erik), Ikram, M.A. (Arfan), Duijn, C.M. (Cornelia) van, Uitterlinden, A.G. (André), Hofman, A. (Albert), Steinböck, H. (Hannelore), Gruber-Sedlmayr, U. (Ursula), Neophytou, B. (Birgit), Zara, F. (Federico), Hahn, A. (Andreas), Gormley, A.M., Becker, F. (Felicitas), Weber, Y.G. (Yvonne G.), Cilio, M.R. (Maria Roberta), Kunz, W.S. (Wolfram S.), Krause, R. (Roland), Zimprich, F. (Fritz), Lemke, J.R. (Johannes R.), Nürnberg, P. (Peter), Sander, T. (Thomas), Lerche, H. (Holger), Neubauer, B.A. (Bernd A.), Palotie, A. (Aarno), Ruppert, A.-K. (Ann-Kathrin), Suls, A. (A.), Siren, A. (Auli), Koeleman, B.P.C. (Bobby), Haberlandt, E. (Edda), Ronen, G.M. (Gabriel M.), Caglayan, H. (Hande), Hjalgrim, H. (Helle), Muhle, H. (Hiltrud), Schulz, H. (Herbert), Helbig, I. (Ingo), Altmüller, J. (Janine), Geldner, J. (Julia), Schubert, J. (Julian), Jabbari, K. (Kamel), Everett, K. (Kate), Feucht, M. (Martha), Balestri, M. (Martina), Nothnagel, M. (Michael), Striano, P. (Pasquale), Møller, R.S. (Rikke), Nabbout, R. (Rima), Balling, R. (Rudi), Baulac, S. (Stephanie), Kunz, W. (Wolfram), Bianchi, A. (Amedeo), La Neve, A. (Angela), Minetti, C., Giuseppe, C. (Capovilla), Lal, D. (Dennis), Reinthaler, E.M. (Eva M.), Dejanovic, B. (Borislav), May, P. (Patrick), Thiele, H. (Holger), Lehesjoki, A.E., Schwarz, G. (Günter), Riesch, E. (Erik), Ikram, M.A. (Arfan), Duijn, C.M. (Cornelia) van, Uitterlinden, A.G. (André), Hofman, A. (Albert), Steinböck, H. (Hannelore), Gruber-Sedlmayr, U. (Ursula), Neophytou, B. (Birgit), Zara, F. (Federico), Hahn, A. (Andreas), Gormley, A.M., Becker, F. (Felicitas), Weber, Y.G. (Yvonne G.), Cilio, M.R. (Maria Roberta), Kunz, W.S. (Wolfram S.), Krause, R. (Roland), Zimprich, F. (Fritz), Lemke, J.R. (Johannes R.), Nürnberg, P. (Peter), Sander, T. (Thomas), Lerche, H. (Holger), Neubauer, B.A. (Bernd A.), Palotie, A. (Aarno), Ruppert, A.-K. (Ann-Kathrin), Suls, A. (A.), Siren, A. (Auli), Koeleman, B.P.C. (Bobby), Haberlandt, E. (Edda), Ronen, G.M. (Gabriel M.), Caglayan, H. (Hande), Hjalgrim, H. (Helle), Muhle, H. (Hiltrud), Schulz, H. (Herbert), Helbig, I. (Ingo), Altmüller, J. (Janine), Geldner, J. (Julia), Schubert, J. (Julian), Jabbari, K. (Kamel), Everett, K. (Kate), Feucht, M. (Martha), Balestri, M. (Martina), Nothnagel, M. (Michael), Striano, P. (Pasquale), Møller, R.S. (Rikke), Nabbout, R. (Rima), Balling, R. (Rudi), Baulac, S. (Stephanie), Kunz, W. (Wolfram), Bianchi, A. (Amedeo), La Neve, A. (Angela), Minetti, C., and Giuseppe, C. (Capovilla)

Abstract

Objective: The SCN1A gene, coding for the voltage-gated Na+ channel alpha subunit NaV1.1, is the clinically most relevant epilepsy gene. With the advent of high-throughput next-generation sequencing, clinical laboratories are generating an ever-increasing catalogue of SCN1A variants. Variants are more likely to be classified as pathogenic if they have already been identified previously in a patient with epilepsy. Here, we critically re-evaluate the pathogenicity of this class of variants in a cohort of patients with common epilepsy syndromes and subsequently ask whether a significant fraction of benign variants have been misclassified as pathogenic. Methods: We screened a discovery cohort of 448 patients with a broad range of common genetic epilepsies and 734 controls for previously reported SCN1A mutations that were assumed to be disease causing. We re-evaluated the evidence for pathogenicity of the identified variants using in silico predictions, segregation, original reports, available functional data and assessment of allele frequencies in healthy individuals as well as in a follow up cohort of 777 patients. Results and Interpretation: We identified 8 known missense mutations, previously reported as patho

Published
2016
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11. CHD2 variants are a risk factor for photosensitivity in epilepsy

Author

Galizia, EC, Myers, CT, Leu, C, de Kovel, CGF, Afrikanova, T, Cordero-Maldonado, ML, Martins, TG, Jacmin, M, Drury, S, Chinthapalli, VK, Muhle, H, Pendziwiat, M, Sander, T, Ruppert, A-K, Moller, RS, Thiele, H, Krause, R, Schubert, J, Lehesjoki, A-E, Nuernberg, P, Lerche, H, Palotie, A, Coppola, A, Striano, S, Del Gaudio, L, Boustred, C, Schneider, AL, Lench, N, Jocic-Jakubi, B, Covanis, A, Capovilla, G, Veggiotti, P, Piccioli, M, Parisi, P, Cantonetti, L, Sadleir, LG, Mullen, SA, Berkovic, SF, Stephani, U, Helbig, I, Crawford, AD, Esguerra, CV, Trenite, DGAK-N, Koeleman, BPC, Mefford, HC, Scheffer, IE, Sisodiya, SM, Galizia, EC, Myers, CT, Leu, C, de Kovel, CGF, Afrikanova, T, Cordero-Maldonado, ML, Martins, TG, Jacmin, M, Drury, S, Chinthapalli, VK, Muhle, H, Pendziwiat, M, Sander, T, Ruppert, A-K, Moller, RS, Thiele, H, Krause, R, Schubert, J, Lehesjoki, A-E, Nuernberg, P, Lerche, H, Palotie, A, Coppola, A, Striano, S, Del Gaudio, L, Boustred, C, Schneider, AL, Lench, N, Jocic-Jakubi, B, Covanis, A, Capovilla, G, Veggiotti, P, Piccioli, M, Parisi, P, Cantonetti, L, Sadleir, LG, Mullen, SA, Berkovic, SF, Stephani, U, Helbig, I, Crawford, AD, Esguerra, CV, Trenite, DGAK-N, Koeleman, BPC, Mefford, HC, Scheffer, IE, and Sisodiya, SM

Abstract

Photosensitivity is a heritable abnormal cortical response to flickering light, manifesting as particular electroencephalographic changes, with or without seizures. Photosensitivity is prominent in a very rare epileptic encephalopathy due to de novo CHD2 mutations, but is also seen in epileptic encephalopathies due to other gene mutations. We determined whether CHD2 variation underlies photosensitivity in common epilepsies, specific photosensitive epilepsies and individuals with photosensitivity without seizures. We studied 580 individuals with epilepsy and either photosensitive seizures or abnormal photoparoxysmal response on electroencephalography, or both, and 55 individuals with photoparoxysmal response but no seizures. We compared CHD2 sequence data to publicly available data from 34 427 individuals, not enriched for epilepsy. We investigated the role of unique variants seen only once in the entire data set. We sought CHD2 variants in 238 exomes from familial genetic generalized epilepsies, and in other public exome data sets. We identified 11 unique variants in the 580 individuals with photosensitive epilepsies and 128 unique variants in the 34 427 controls: unique CHD2 variation is over-represented in cases overall (P = 2.17 × 10(-5)). Among epilepsy syndromes, there was over-representation of unique CHD2 variants (3/36 cases) in the archetypal photosensitive epilepsy syndrome, eyelid myoclonia with absences (P = 3.50 × 10(-4)). CHD2 variation was not over-represented in photoparoxysmal response without seizures. Zebrafish larvae with chd2 knockdown were tested for photosensitivity. Chd2 knockdown markedly enhanced mild innate zebrafish larval photosensitivity. CHD2 mutation is the first identified cause of the archetypal generalized photosensitive epilepsy syndrome, eyelid myoclonia with absences. Unique CHD2 variants are also associated with photosensitivity in common epilepsies. CHD2 does not encode an ion channel, opening new avenues for research into hum

Published
2015

12. Genome-wide association analysis of genetic generalized epilepsies implicates susceptibility loci at 1q43, 2p16.1, 2q22.3 and 17q21.32

Author

Steffens, M, Leu, C, Ruppert, A-K, Zara, F, Striano, P, Robbiano, A, Capovilla, G, Tinuper, P, Gambardella, A, Bianchi, A, La Neve, A, Crichiutti, G, de Kovel, CGF, Trenite, DK-N, de Haan, G-J, Lindhout, D, Gaus, V, Schmitz, B, Janz, D, Weber, YG, Becker, F, Lerche, H, Steinhoff, BJ, Kleefuss-Lie, AA, Kunz, WS, Surges, R, Elger, CE, Muhle, H, von Spiczak, S, Ostertag, P, Helbig, I, Stephani, U, Moller, RS, Hjalgrim, H, Dibbens, LM, Bellows, S, Oliver, K, Mullen, S, Scheffer, IE, Berkovic, SF, Everett, KV, Gardiner, MR, Marini, C, Guerrini, R, Lehesjoki, A-E, Siren, A, Guipponi, M, Malafosse, A, Thomas, P, Nabbout, R, Baulac, S, Leguern, E, Guerrero, R, Serratosa, JM, Reif, PS, Rosenow, F, Moerzinger, M, Feucht, M, Zimprich, F, Kapser, C, Schankin, CJ, Suls, A, Smets, K, De Jonghe, P, Jordanova, A, Caglayan, H, Yapici, Z, Yalcin, DA, Baykan, B, Bebek, N, Ozbek, U, Gieger, C, Wichmann, H-E, Balschun, T, Ellinghaus, D, Franke, A, Meesters, C, Becker, T, Wienker, TF, Hempelmann, A, Schulz, H, Rueschendorf, F, Leber, M, Pauck, SM, Trucks, H, Toliat, MR, Nuernberg, P, Avanzini, G, Koeleman, BPC, Sander, T, Steffens, M, Leu, C, Ruppert, A-K, Zara, F, Striano, P, Robbiano, A, Capovilla, G, Tinuper, P, Gambardella, A, Bianchi, A, La Neve, A, Crichiutti, G, de Kovel, CGF, Trenite, DK-N, de Haan, G-J, Lindhout, D, Gaus, V, Schmitz, B, Janz, D, Weber, YG, Becker, F, Lerche, H, Steinhoff, BJ, Kleefuss-Lie, AA, Kunz, WS, Surges, R, Elger, CE, Muhle, H, von Spiczak, S, Ostertag, P, Helbig, I, Stephani, U, Moller, RS, Hjalgrim, H, Dibbens, LM, Bellows, S, Oliver, K, Mullen, S, Scheffer, IE, Berkovic, SF, Everett, KV, Gardiner, MR, Marini, C, Guerrini, R, Lehesjoki, A-E, Siren, A, Guipponi, M, Malafosse, A, Thomas, P, Nabbout, R, Baulac, S, Leguern, E, Guerrero, R, Serratosa, JM, Reif, PS, Rosenow, F, Moerzinger, M, Feucht, M, Zimprich, F, Kapser, C, Schankin, CJ, Suls, A, Smets, K, De Jonghe, P, Jordanova, A, Caglayan, H, Yapici, Z, Yalcin, DA, Baykan, B, Bebek, N, Ozbek, U, Gieger, C, Wichmann, H-E, Balschun, T, Ellinghaus, D, Franke, A, Meesters, C, Becker, T, Wienker, TF, Hempelmann, A, Schulz, H, Rueschendorf, F, Leber, M, Pauck, SM, Trucks, H, Toliat, MR, Nuernberg, P, Avanzini, G, Koeleman, BPC, and Sander, T

Abstract

Genetic generalized epilepsies (GGEs) have a lifetime prevalence of 0.3% and account for 20-30% of all epilepsies. Despite their high heritability of 80%, the genetic factors predisposing to GGEs remain elusive. To identify susceptibility variants shared across common GGE syndromes, we carried out a two-stage genome-wide association study (GWAS) including 3020 patients with GGEs and 3954 controls of European ancestry. To dissect out syndrome-related variants, we also explored two distinct GGE subgroups comprising 1434 patients with genetic absence epilepsies (GAEs) and 1134 patients with juvenile myoclonic epilepsy (JME). Joint Stage-1 and 2 analyses revealed genome-wide significant associations for GGEs at 2p16.1 (rs13026414, P(meta) = 2.5 × 10(-9), OR[T] = 0.81) and 17q21.32 (rs72823592, P(meta) = 9.3 × 10(-9), OR[A] = 0.77). The search for syndrome-related susceptibility alleles identified significant associations for GAEs at 2q22.3 (rs10496964, P(meta) = 9.1 × 10(-9), OR[T] = 0.68) and at 1q43 for JME (rs12059546, P(meta) = 4.1 × 10(-8), OR[G] = 1.42). Suggestive evidence for an association with GGEs was found in the region 2q24.3 (rs11890028, P(meta) = 4.0 × 10(-6)) nearby the SCN1A gene, which is currently the gene with the largest number of known epilepsy-related mutations. The associated regions harbor high-ranking candidate genes: CHRM3 at 1q43, VRK2 at 2p16.1, ZEB2 at 2q22.3, SCN1A at 2q24.3 and PNPO at 17q21.32. Further replication efforts are necessary to elucidate whether these positional candidate genes contribute to the heritability of the common GGE syndromes.

Published
2012

13. Who, exactly, is a 'first informer'?

Author

Ruppert, Kevin K. and Lyle, Dennis

Subjects
Mass communications
Abstract

Regarding the Jan. 16 column ''First Informer' Concept Spreads': One question I have is whether the Illinois bill refers to news and operations personnel, or only to engineers and technical [...]

Published
2013

14. Mic design: Technology has made good mics cheaper and allowed the addition of useful features.

Author

RUPPERT, KEVIN K.

Subjects
MICROPHONES, TRANSMISSION of sound, PRODUCTION studio equipment & supplies, TECHNOLOGICAL innovations, AUDIO equipment
Abstract

The article presents information related to the technological developments regarding microphone design. It is stated that the old designs were unique at the time as they raised the bar for performance. It is mentioned that an RCA ribbon mic can be counted on to sound good on brass while the U47c can generally be counted on to sound good on voices.

Published
2011

15. Mic design.

Author

RUPPERT, KEVIN K.

Subjects
MICROPHONES -- Design & construction, AUDIO equipment, HISTORY
Abstract

The article focuses on the integration of classic design and modern technology in designing efficient and reliable microphones (mics). It presents the insights of several experts in the audio technology including David Royer, Juergen Breitlow and Chad Wiggins, on evaluating a microphone performance. Royer relates the difficulty in providing numbers to determine the subtle differences in sound between microphones.

Published
2011

16. READER'S FORUM.

Author

Ruppert, Kevin K., Lyle, Dennis, and Calhoun, Rob

Subjects
FREQUENCY (Linguistics), RADIO stations, RADIO broadcasting
Abstract

Two letters to the editor are presented in response to articles in previous issues including "First Informer' Concept Spread," which is related to Illinois bill on January 16, 2013 issue and "Why WTCJ(AM) Asked for a Waiver," regarding the use of FM frequencies by Bud Walters on December 19, 2012.

Published
2013

17. OPEN MIKE.

Author

Ruppert, Kevin K.

Subjects
LETTERS to the editor, FOOTBALL on television
Abstract

A letter to the editor is presented in response to the article "A Political Football," published in the December 10, 2007 issue.

Published
2007

18. Rare coding variants in genes encoding GABAA receptors in genetic generalised epilepsies: an exome-based case-control study

Author

Patrick May, Simon Girard, Merle Harrer, Dheeraj R Bobbili, Julian Schubert, Stefan Wolking, Felicitas Becker, Pamela Lachance-Touchette, Caroline Meloche, Micheline Gravel, Cristina E Niturad, Julia Knaus, Carolien De Kovel, Mohamad Toliat, Anne Polvi, Michele Iacomino, Rosa Guerrero-López, Stéphanie Baulac, Carla Marini, Holger Thiele, Janine Altmüller, Kamel Jabbari, Ann-Kathrin Ruppert, Wiktor Jurkowski, Dennis Lal, Raffaella Rusconi, Sandrine Cestèle, Benedetta Terragni, Ian D Coombs, Christopher A Reid, Pasquale Striano, Hande Caglayan, Auli Siren, Kate Everett, Rikke S Møller, Helle Hjalgrim, Hiltrud Muhle, Ingo Helbig, Wolfram S Kunz, Yvonne G Weber, Sarah Weckhuysen, Peter De Jonghe, Sanjay M Sisodiya, Rima Nabbout, Silvana Franceschetti, Antonietta Coppola, Maria S Vari, Dorothée Kasteleijn-Nolst Trenité, Betul Baykan, Ugur Ozbek, Nerses Bebek, Karl M Klein, Felix Rosenow, Dang K Nguyen, François Dubeau, Lionel Carmant, Anne Lortie, Richard Desbiens, Jean-François Clément, Cécile Cieuta-Walti, Graeme J Sills, Pauls Auce, Ben Francis, Michael R Johnson, Anthony G Marson, Bianca Berghuis, Josemir W Sander, Andreja Avbersek, Mark McCormack, Gianpiero L Cavalleri, Norman Delanty, Chantal Depondt, Martin Krenn, Fritz Zimprich, Sarah Peter, Marina Nikanorova, Robert Kraaij, Jeroen van Rooij, Rudi Balling, M Arfan Ikram, André G Uitterlinden, Giuliano Avanzini, Stephanie Schorge, Steven Petrou, Massimo Mantegazza, Thomas Sander, Eric LeGuern, Jose M Serratosa, Bobby P C Koeleman, Aarno Palotie, Anna-Elina Lehesjoki, Michael Nothnagel, Peter Nürnberg, Snezana Maljevic, Federico Zara, Patrick Cossette, Roland Krause, Holger Lerche, Edoardo Ferlazzo, Carlo di Bonaventura, Angela La Neve, Paolo Tinuper, Francesca Bisulli, Aglaia Vignoli, Giuseppe Capovilla, Giovanni Crichiutti, Antonio Gambardella, Vincenzo Belcastro, Amedeo Bianchi, Destina Yalçın, Gulsen Dizdarer, Kezban Arslan, Zuhal Yapıcı, Demet Kuşcu, Costin Leu, Kristin Heggeli, Joseph Willis, Sarah R Langley, Andrea Jorgensen, Prashant Srivastava, Sarah Rau, Christian Hengsbach, Anja C.M. Sonsma, Université Côte d'Azur, CNRS, UMR 7275, Institut de Pharmacologie Moléculaire et Cellulaire, Sophia Antipolis, Erasmus University Medical Center [Rotterdam] (Erasmus MC), Laboratory of Molecular Genetics of Stem Cells [University of Montreal], University of Montreal-Institut de Recherche en Immunologie et en Cancérologie [UdeM-Montréal] (IRIC), Université de Montréal (UdeM)-Université de Montréal (UdeM), University of Tübingen, University Medical Center [Utrecht], Universita degli studi di Genova, Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière (CRICM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), A.Meyer Children's Hospital, Max Planck Institute for Plant Breeding Research (MPIPZ), Génomique métabolique (UMR 8030), Genoscope - Centre national de séquençage [Evry] (GENOSCOPE), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS), University of Cologne, The Genome Analysis Centre (TGAC), Cologne Center for Genomics, Institut de pharmacologie moléculaire et cellulaire (IPMC), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des protéines (IP), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Department of Neurophysiopathology, Besta Neurological Institute, University of Southern Denmark (SDU), Medical Genetics Laboratory, Children’s Hospital of Philadelphia (CHOP ), Universitätsklinikum Bonn (UKB), Antwerp University Hospital [Edegem] (UZA), University of Antwerp (UA), Department of Clinical and Experimental Epilepsy, University College of London [London] (UCL), Département de Neuropédiatrie, CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Instituco Neurologico C. Besta, Instituto Neurologico C. Besta, Medical Genetics and Pediatric Cardiology, IRCCS Ospedale Pediatrico Bambino Gesù [Roma], Département de mathématiques [Sherbrooke] (UdeS), Faculté des sciences [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS)-Université de Sherbrooke (UdeS), University of Liverpool, Institute of Neurology [London], Royal College of Surgeons in Ireland (RCSI), Neurology Division, Beaumont Hospital, Dublin 9, Ireland, Beaumont Hospital, Hôpital Erasme [Bruxelles] (ULB), Faculté de Médecine [Bruxelles] (ULB), Université libre de Bruxelles (ULB)-Université libre de Bruxelles (ULB), Medizinische Universität Wien = Medical University of Vienna, Department of Epilepsy Clinic and Experimental Neurophysiology, Fondazione IRCCS Istituto Neurologico 'Carlo Besta', Broad Institute of MIT and Harvard (BROAD INSTITUTE), Harvard Medical School [Boston] (HMS)-Massachusetts Institute of Technology (MIT)-Massachusetts General Hospital [Boston], Department of Medical and Clinical Genetics [Helsinki], Haartman Institute [Helsinki], Faculty of Medecine [Helsinki], Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Faculty of Medecine [Helsinki], Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Institute of Medical Informatics and Statistics, Pediatric Neurology and Neuromuscular Diseases Unit, Centre Hospitalier de l'Université de Montréal (CHUM), Université de Montréal (UdeM), Hertie Institute for Clinical Brain Research [Tubingen], Regional Epilepsy Center, Reggio Calabria, Agronomes et Vétérinaires Sans Frontières (AVSF), AVSF, NIHR Biomedical Research Centre [London], Guy's and St Thomas' NHS Foundation Trust-King‘s College London, Wellcome Trust, Commission of the European Communities, Imperial College Healthcare NHS Trust- BRC Funding, Internal Medicine, Epidemiology, Luxembourg Centre For Systems Biomedicine (LCSB), University of Luxembourg [Luxembourg], Università degli studi di Genova = University of Genoa (UniGe), Heart Center Leipzig, University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein (UKSH), Kiel University, Acibadem University Dspace, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université d'Évry-Val-d'Essonne (UEVE), Université Nice Sophia Antipolis (... - 2019) (UNS), University of Helsinki-University of Helsinki-Faculty of Medecine [Helsinki], University of Helsinki-University of Helsinki, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, Institute for Molecular Medicine Finland, Medicum, Research Programme for Molecular Neurology, Research Programs Unit, Neuroscience Center, University of Helsinki, Genomics of Neurological and Neuropsychiatric Disorders, Epicure Consortium, EuroEPINOMICS COGIE Consortium, EpiPGX Consortium, May, Gabriella, Girard, S., Harrer, M., Bobbili, D. R., Schubert, J., Wolking, S., Becker, F., Lachance-Touchette, P., Meloche, C., Gravel, M., Niturad, C. E., Knaus, J., De Kovel, C., Toliat, M., Polvi, A., Iacomino, M., Guerrero-López, R., Baulac, S., Marini, C., Thiele, H., Altmüller, J., Jabbari, K., Ruppert, A. -K., Jurkowski, W., Lal, D., Rusconi, R., Cestèle, S., Terragni, B., Coombs, I. D., Reid, C. A., Striano, P., Caglayan, H., Siren, A., Everett, K., Møller, R. S., Hjalgrim, H., Muhle, H., Helbig, I., Kunz, W. S., Weber, Y. G., Weckhuysen, S., Jonghe, P. D., Sisodiya, S. M., Nabbout, R., Franceschetti, S., Coppola, A., Vari, M. S., Kasteleijn-Nolst Trenité, D., Baykan, B., Ozbek, U., Bebek, N., Klein, K. M., Rosenow, F., Nguyen, D. K., Dubeau, F., Carmant, L., Lortie, A., Desbiens, R., Clément, J. -F., Cieuta-Walti, C., Sills, G. J., Auce, P., Francis, B., Johnson, M. R., Marson, A. G., Berghuis, B., Sander, J. W., Avbersek, A., Mccormack, M., Cavalleri, G. L., Delanty, N., Depondt, C., Krenn, M., Zimprich, F., Peter, S., Nikanorova, M., Kraaij, R., van Rooij, J., Balling, R., Ikram, M. A., Uitterlinden, A. G., Avanzini, Giulio, Schorge, S., Petrou, S., Mantegazza, M., Sander, T., Leguern, E., Serratosa, J. M., Koeleman, B. P. C., Palotie, A., Lehesjoki, A. -E., Nothnagel, M., Nürnberg, P., Maljevic, S., Zara, F., Cossette, P., Krause, R., Lerche, H., De Jonghe, P., Arfan Ikram, M., Ferlazzo, E., di Bonaventura, C., La Neve, A., Tinuper, P., Bisulli, F., Vignoli, Massimo, Capovilla, G., Crichiutti, G., Gambardella, A., Belcastro, V., Bianchi, A., Yalçın, D., Dizdarer, G., Arslan, K., Yapıcı, Z., Kuşcu, D., Leu, C., Heggeli, K., Willis, J., Langley, S. R., Jorgensen, A., Srivastava, P., Rau, S., Hengsbach, C., Sonsma, A. C. M., University of Montreal-Institute for Research in Immunology and Cancer (IRIC), Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université d'Évry-Val-d'Essonne (UEVE), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Département de Mathématiques, Université de Sherbrooke, Université de Sherbrooke [Sherbrooke], Hôpital Erasme (Bruxelles), May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj R, Schubert, Julian, Wolking, Stefan, Becker, Felicita, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Cristina E, Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-López, Rosa, Baulac, Stéphanie, Marini, Carla, Thiele, Holger, Altmüller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Denni, Rusconi, Raffaella, Cestèle, Sandrine, Terragni, Benedetta, Coombs, Ian D, Reid, Christopher A, Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Møller, Rikke S, Hjalgrim, Helle, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S, Weber, Yvonne G, Weckhuysen, Sarah, Jonghe, Peter De, Sisodiya, Sanjay M, Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S, Kasteleijn-Nolst Trenité, Dorothée, Baykan, Betul, Ozbek, Ugur, Bebek, Nerse, Klein, Karl M, Rosenow, Felix, Nguyen, Dang K, Dubeau, Françoi, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clément, Jean-Françoi, Cieuta-Walti, Cécile, Sills, Graeme J, Auce, Paul, Francis, Ben, Johnson, Michael R, Marson, Anthony G, Berghuis, Bianca, Sander, Josemir W, Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M Arfan, Uitterlinden, André G, Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thoma, LeGuern, Eric, Serratosa, Jose M, Koeleman, Bobby P C, Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nürnberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, Lerche, Holger, De Jonghe, Peter, Ferlazzo, Edoardo, di Bonaventura, Carlo, La Neve, Angela, Tinuper, Paolo, Bisulli, Francesca, Vignoli, Aglaia, Capovilla, Giuseppe, Crichiutti, Giovanni, Gambardella, Antonio, Belcastro, Vincenzo, Bianchi, Amedeo, Yalçın, Destina, Dizdarer, Gulsen, Arslan, Kezban, Yapıcı, Zuhal, Kuşcu, Demet, Leu, Costin, Heggeli, Kristin, Willis, Joseph, Langley, Sarah R, Jorgensen, Andrea, Srivastava, Prashant, Rau, Sarah, Hengsbach, Christian, and Sonsma, Anja C.M.

Subjects
0301 basic medicine, GAMMA-2-SUBUNIT, [SDV]Life Sciences [q-bio], GABRA5, Clinical Neurology, 15Q13.3 MICRODELETIONS, ABSENCE EPILEPSY, SEQUENCE DATA, [SDV.BC]Life Sciences [q-bio]/Cellular Biology, 3124 Neurology and psychiatry, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Genetic variation, medicine, EPILEPTIC ENCEPHALOPATHIES, Exome, Exome sequencing, ComputingMilieux_MISCELLANEOUS, Genetic association, Genetics, RISK, Science & Technology, FEBRILE SEIZURES, Neurology & Neurosurgery, biology, 3112 Neurosciences, 1103 Clinical Sciences, MOUSE MODEL, medicine.disease, ASSOCIATION ANALYSIS, 030104 developmental biology, DE-NOVO MUTATIONS, Cohort, biology.protein, Neurology (clinical), Human medicine, Neurosciences & Neurology, 1109 Neurosciences, Life Sciences & Biomedicine, 030217 neurology & neurosurgery, Cohort study
Abstract

BACKGROUND: Genetic generalised epilepsy is the most common type of inherited epilepsy. Despite a high concordance rate of 80% in monozygotic twins, the genetic background is still poorly understood. We aimed to investigate the burden of rare genetic variants in genetic generalised epilepsy.METHODS: For this exome-based case-control study, we used three different genetic generalised epilepsy case cohorts and three independent control cohorts, all of European descent. Cases included in the study were clinically evaluated for genetic generalised epilepsy. Whole-exome sequencing was done for the discovery case cohort, a validation case cohort, and two independent control cohorts. The replication case cohort underwent targeted next-generation sequencing of the 19 known genes encoding subunits of GABAA receptors and was compared to the respective GABAA receptor variants of a third independent control cohort. Functional investigations were done with automated two-microelectrode voltage clamping in Xenopus laevis oocytes.FINDINGS: Statistical comparison of 152 familial index cases with genetic generalised epilepsy in the discovery cohort to 549 ethnically matched controls suggested an enrichment of rare missense (Nonsyn) variants in the ensemble of 19 genes encoding GABAA receptors in cases (odds ratio [OR] 2·40 [95% CI 1·41-4·10]; pNonsyn=0·0014, adjusted pNonsyn=0·019). Enrichment for these genes was validated in a whole-exome sequencing cohort of 357 sporadic and familial genetic generalised epilepsy cases and 1485 independent controls (OR 1·46 [95% CI 1·05-2·03]; pNonsyn=0·0081, adjusted pNonsyn=0·016). Comparison of genes encoding GABAA receptors in the independent replication cohort of 583 familial and sporadic genetic generalised epilepsy index cases, based on candidate-gene panel sequencing, with a third independent control cohort of 635 controls confirmed the overall enrichment of rare missense variants for 15 GABAA receptor genes in cases compared with controls (OR 1·46 [95% CI 1·02-2·08]; pNonsyn=0·013, adjusted pNonsyn=0·027). Functional studies for two selected genes (GABRB2 and GABRA5) showed significant loss-of-function effects with reduced current amplitudes in four of seven tested variants compared with wild-type receptors.INTERPRETATION: Functionally relevant variants in genes encoding GABAA receptor subunits constitute a significant risk factor for genetic generalised epilepsy. Examination of the role of specific gene groups and pathways can disentangle the complex genetic architecture of genetic generalised epilepsy.FUNDING: EuroEPINOMICS (European Science Foundation through national funding organisations), Epicure and EpiPGX (Sixth Framework Programme and Seventh Framework Programme of the European Commission), Research Unit FOR2715 (German Research Foundation and Luxembourg National Research Fund).

Published
2018
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19. CHD2 variants are a risk factor for photosensitivity in epilepsy

Author

Galizia, Elizabeth C, Myers, Candace T, Leu, Costin, de Kovel, Carolien G F, Afrikanova, Tatiana, Cordero-Maldonado, Maria Lorena, Martins, Teresa G, Jacmin, Maxime, Drury, Suzanne, Krishna Chinthapalli, V, Muhle, Hiltrud, Pendziwiat, Manuela, Sander, Thomas, Ruppert, Ann-Kathrin, Møller, Rikke S, Thiele, Holger, Krause, Roland, Schubert, Julian, Lehesjoki, Anna-Elina, Nürnberg, Peter, Lerche, Holger, Palotie, Aarno, Coppola, Antonietta, Striano, Salvatore, Gaudio, Luigi Del, Boustred, Christopher, Schneider, Amy L, Lench, Nicholas, Jocic-Jakubi, Bosanka, Covanis, Athanasios, Capovilla, Giuseppe, Veggiotti, Pierangelo, Piccioli, Marta, Parisi, Pasquale, Cantonetti, Laura, Sadleir, Lynette G, Mullen, Saul A, Berkovic, Samuel F, Stephani, Ulrich, Helbig, Ingo, Crawford, Alexander D, Esguerra, Zara, Federico, Striano, Pasquale, Camila, V, Kasteleijn-Nolst Trenité, Dorothee G A, Koeleman, Bobby P C, Mefford, Heather C, Scheffer, Ingrid E, Sisodiya, Sanjay M, Luxembourg Centre for Systems Biomedicine (LCSB): Chemical Biology (Crawford Group) [research center], Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Galizia, E. C., Myers, C. T., Leu, C., De Kovel, C. G. F., Afrikanova, T., Cordero-Maldonado, M. L., Martins, T. G., Jacmin, M., Drury, S., Chinthapalli, V. K., Muhle, H., Pendziwiat, M., Sander, T., Ruppert, A. -K., Moller, R. S., Thiele, H., Krause, R., Schubert, J., Lehesjoki, A. -E., Nürnberg, P., Lerche, H., Palotie, A., Coppola, A., Striano, S., Del Gaudio, L., Boustred, C., Schneider, A. L., Lench, N., Jocic-Jakubi, B., Covanis, A., Capovilla, G., Veggiotti, P., Piccioli, M., Parisi, P., Cantonetti, L., Sadleir, L. G., Mullen, S. A., Berkovic, S. F., Stephani, U., Helbig, I., Crawford, A. D., Esguerra, C. V., Trenité, D. G. A. K. -N., Koeleman, B. P. C., Mefford, H. C., Scheffer, I. E., and Sisodiya, S. M.

Subjects
INTELLECTUAL DISABILITY, Neurology [D14] [Human health sciences], seizure, Epilepsy, Reflex, Research Support, N.I.H., Extramural, eyelid myoclonia with absences, photosensitive, animals, DNA-binding proteins, electroencephalography, epilepsy, reflex, gene knockdown techniques, humans, mutation, photic stimulation, risk factors, zebrafish, genetic predisposition to disease, Risk Factors, Reflex, Journal Article, Animals, Humans, MICRODELETION, Genetic Predisposition to Disease, JUVENILE MYOCLONIC EPILEPSY, Zebrafish, COPY NUMBER VARIANTS, Epilepsy, Neurologie [D14] [Sciences de la santé humaine], Research Support, Non-U.S. Gov't, Electroencephalography, Original Articles, GENETIC DISSECTION, FAMILY, DNA-Binding Proteins, DE-NOVO MUTATIONS, Gene Knockdown Techniques, Mutation, Photic Stimulation, LENNOX-GASTAUT SYNDROME, IDIOPATHIC GENERALIZED EPILEPSY, ENCEPHALOPATHIES
Abstract

Photosensitivity in epilepsy is common and has high heritability, but its genetic basis remains uncertain. Galizia et al. reveal an overrepresentation of unique variants of CHD2 — which encodes the transcriptional regulator ‘chromodomain helicase DNA-binding protein 2’ — in photosensitive epilepsies, and show that chd2 knockdown in zebrafish causes photosensitivity., Photosensitivity is a heritable abnormal cortical response to flickering light, manifesting as particular electroencephalographic changes, with or without seizures. Photosensitivity is prominent in a very rare epileptic encephalopathy due to de novo CHD2 mutations, but is also seen in epileptic encephalopathies due to other gene mutations. We determined whether CHD2 variation underlies photosensitivity in common epilepsies, specific photosensitive epilepsies and individuals with photosensitivity without seizures. We studied 580 individuals with epilepsy and either photosensitive seizures or abnormal photoparoxysmal response on electroencephalography, or both, and 55 individuals with photoparoxysmal response but no seizures. We compared CHD2 sequence data to publicly available data from 34 427 individuals, not enriched for epilepsy. We investigated the role of unique variants seen only once in the entire data set. We sought CHD2 variants in 238 exomes from familial genetic generalized epilepsies, and in other public exome data sets. We identified 11 unique variants in the 580 individuals with photosensitive epilepsies and 128 unique variants in the 34 427 controls: unique CHD2 variation is over-represented in cases overall (P = 2·17 × 10−5). Among epilepsy syndromes, there was over-representation of unique CHD2 variants (3/36 cases) in the archetypal photosensitive epilepsy syndrome, eyelid myoclonia with absences (P = 3·50 × 10−4). CHD2 variation was not over-represented in photoparoxysmal response without seizures. Zebrafish larvae with chd2 knockdown were tested for photosensitivity. Chd2 knockdown markedly enhanced mild innate zebrafish larval photosensitivity. CHD2 mutation is the first identified cause of the archetypal generalized photosensitive epilepsy syndrome, eyelid myoclonia with absences. Unique CHD2 variants are also associated with photosensitivity in common epilepsies. CHD2 does not encode an ion channel, opening new avenues for research into human cortical excitability.

Published
2015
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