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4. Functional variants in HCN4 and CACNA1H may contribute to genetic generalized epilepsy

Author

Georgeta Teodorescu, Han-Shen Tae, A. Marie Phillips, Steven Petrou, Holger Lerche, Christopher A. Reid, Kerstin Hallmann, Ailing A. Kleefuss-Lie, Snezana Maljevic, Wolfram S. Kunz, Christian E. Elger, Felicitas Becker, Yvonne G. Weber, and Edward Perez-Reyes

Subjects
0301 basic medicine, Xenopus, Biology, DNA sequencing, 03 medical and health sciences, 0302 clinical medicine, CACNA1H, medicine, HCN4, T‐type Ca2+ channels, Generalized epilepsy, Gene, Ion channel, Genetics, Functional analysis, Full‐Length Original Research, Depolarization, medicine.disease, biology.organism_classification, Thalamo‐cortical circuits, 030104 developmental biology, Neurology, biology.protein, Neurology (clinical), 030217 neurology & neurosurgery
Abstract

Summary Objective Genetic generalized epilepsy (GGE) encompasses seizure disorders characterized by spike‐and‐wave discharges (SWD) originating within thalamo‐cortical circuits. Hyperpolarization‐activated (HCN) and T‐type Ca2+ channels are key modulators of rhythmic activity in these brain regions. Here, we screened HCN4 and CACNA1H genes for potentially contributory variants and provide their functional analysis. Methods Targeted gene sequencing was performed in 20 unrelated familial cases with different subtypes of GGE, and the results confirmed in 230 ethnically matching controls. Selected variants in CACNA1H and HCN4 were functionally assessed in tsA201 cells and Xenopus laevis oocytes, respectively. Results We discovered a novel CACNA1H (p.G1158S) variant in two affected members of a single family. One of them also carried an HCN4 (p.P1117L) variant inherited from the unaffected mother. In a separate family, an HCN4 variant (p.E153G) was identified in one of several affected members. Voltage‐clamp analysis of CACNA1H (p.G1158S) revealed a small but significant gain‐of‐function, including increased current density and a depolarizing shift of steady‐state inactivation. HCN4 p.P1117L and p.G153E both caused a hyperpolarizing shift in activation and reduced current amplitudes, resulting in a loss‐of‐function. Significance Our results are consistent with a model suggesting cumulative contributions of subtle functional variations in ion channels to seizure susceptibility and GGE.

Published
2017

5. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65 046 European population controls (5/393 cases versus 32/65 046 controls; Fisher's exact test P = 2.83 × 10−6, odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10−4). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE

Published
2017

6. Exon-disrupting deletions ofNRXN1in idiopathic generalized epilepsy

Author

Møller, R.S., Weber, Y.G., Klitten, L.L., Trucks, H., Muhle, H., Kunz, W.S., Mefford, H.C., Franke, A., Kautza, M., Wolf, P., Dennig, D., Schreiber, S., Rückert, I.M., Wichmann, H.E., Ernst, J.P., Schurmann, C., Grabe, H.J., Tommerup, N., Stephani, U., Lerche, H., Hjalgrim, H., Helbig, I., Sander, T., Zimprich, F., Mörzinger, M., Feucht, M., Suls, A., Weckhuysen, S., Claes, L., Deprez, L., Smets, K., Van Dyck, T., Deconinck, T., De Jonghe, P., Velizarova, R., Dimova, P., Radionova, M., Tournev, I., Kancheva, D., Kaneva, R., Jordanova, A., Kjelgaard, D.B., Lehesjoki, A.E., Siren, A., Baulac, S., Leguern, E., Von Spiczak, S., Ostertag, P., Leber, M., Leu, C., Toliat, M.R., Nürnberg, P., Hempelmann, A., Rüschendorf, F., Elger, C.E., Kleefuß Lie, A.A., Surges, R., Gaus, V., Janz, D., Schmitz, B., Klein, K.M., Reif, P.S., Oertel, W.H., Hamer, H.M., Rosenow, F., Becker, F., Marini, C., Guerrini, R., Mei, D., Norci, V., Zara, F., Striano, P., Robbiano, A., Pezzella, M., Bianchi, A., Gambardella, A., Tinuper, P., La Neve, A., Capovilla, G., Vigliano, P., Crichiutti, G., Vanadia, F., Vignoli, A., Coppola, A., Striano, S., Giallonardo, M.T., Franceschetti, S., Belcastro, V., Benna, P., Coppola, G., De Palo, A., Ferlazzo, E., Vecchi, M., Martinelli, V., Bisulli, F., Beccaria, F., Del Giudice, E., Mancardi, M., Stranci, G., Scabar, A., Gobbi, G., Giordano, I., Koeleman, B.P.C., De Kovel, C., Lindhout, D., De Haan, G.J., Ozbeck, U., Bebek, N., Baykan, B., Ozdemir, O., Ugur, S., Kocasoy Orhan, E., Yücesan, E., Cine, N., Gokyigit, A., Gurses, C., Gul, G., Yapici, Z., Ozkara, C., Caglayan, H., Yalcin, O., Yalcin, D., Turkdogan, D., Dizdarer, G., Agan, K., R. S. Møller, Y. G. Weber, L. L. Klitten, H. Truck, H. Muhle, W. S. Kunz, H. C. Mefford, A. Franke, M. Kautza, P. Wolf, D. Dennig, S. Schreiber, I. Rückert, H. Wichmann, J. P. Ernst, C. Schurmann, H. J. Grabe, N. Tommerup, U. Stephani, H. Lerche, H. Hjalgrim, I. Helbig, T. Sander, P. Tinuper, F. Bisulli, EPICURE Consortium, Suls, Arvid, Weckhuysen, Sarah, Claes, Godelieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Jordanova, Albena, Møller, R, Weber, Yg, Klitten, Ll, Trucks, H, Muhle, H, Kunz, W, Mefford, Hc, Franke, A, Kautza, M, Wolf, P, Dennig, D, Schreiber, S, Rückert, Im, Wichmann, He, Ernst, Jp, Schurmann, C, Grabe, Hj, Tommerup, N, Stephani, U, Lerche, H, Hjalgrim, H, Helbig, I, Sander, T, Epicure, Consortium, DEL GIUDICE, Ennio, Coppola, Antonietta, and YÜCESAN, EMRAH

Subjects
Male, Idiopathic generalized epilepsy, Neuronal, Idiopathic Generalized Epilepsy, 1q21, 1 Microdeletion, Two-hit Hypothesis, Nrxn1, Neuropsychological Tests, Immunoglobulin E, Cell Adhesion Molecules, Neuronal/genetics, Adult, Age of Onset, Anticonvulsant, Exon, 1q21.1 microdeletion, Exons/genetics, Odds Ratio, Nerve Tissue Proteins/genetics, Copy-number variation, Valproic Acid/therapeutic use, Age of Onset, Neural Cell Adhesion Molecules, genetics, DNA Copy Number Variations, Electroencephalography, Epilepsy, Genetics, biology, Triazines, Anticonvulsants/therapeutic use, Electroencephalography, genetics, Family, Female, Fructose, Exons, Middle Aged, Settore MED/39 - Neuropsichiatria Infantile, Pedigree, therapeutic use, Valproic Acid, Neurology, Settore MED/26 - Neurologia, Anticonvulsants, Epilepsy, Generalized, Female, Adult, Case-Control Studies, Cell Adhesion Molecules, Neuronal, DNA Copy Number Variations, Family, Fructose, Gene Deletion, Genotype, Humans, Infant, Microarray Analysis, Nerve Tissue Proteins, Valproic Acid, analogs /&/ derivatives/therapeutic use, Gene Deletion, Genotype, Humans, Infant, Male, Microarray Analysis, Middle Aged, Nerve Tissue Protein, therapeutic use, Case-Control Studies, Cell Adhesion Molecule, drug therapy/genetics/psychology, Exon, genetics, Neuropsychological Tests, Odds Ratio, Pedigree, Triazine, Lamotrigine, NRXN1, Topiramate, Epilepsy, Generalized/drug therapy, medicine, Allele, Biology, Gene, Generalized, Point mutation, Calcium-Binding Proteins, Odds ratio, medicine.disease, Triazines/therapeutic use, Settore MED/03 - Genetica Medica, therapeutic use, biology.protein, Fructose/analogs & derivatives, Human medicine, Neurology (clinical), Two-hit hypothesis
Abstract

Summary Purpose Neurexins are neuronal adhesion molecules located in the presynaptic terminal, where they interact with postsynaptic neuroligins to form a transsynaptic complex required for efficient neurotransmission in the brain. Recently, deletions and point mutations of the neurexin 1 (NRXN1) gene have been associated with a broad spectrum of neuropsychiatric disorders. This study aimed to investigate if NRXN1 deletions also increase the risk of idiopathic generalized epilepsies (IGEs). Methods We screened for deletions involving the NRXN1 gene in 1,569 patients with IGE and 6,201 controls using high-density oligonucleotide microarrays. Key Findings We identified exon-disrupting deletions of NRXN1 in 5 of 1,569 patients with IGE and 2 of 6,201 control individuals (p = 0.0049; odds ratio (OR) 9.91, 95% confidence interval (CI) 1.92–51.12). A complex familial segregation pattern in the IGE families was observed, suggesting that heterozygous NRXN1 deletions are susceptibility variants. Intriguingly, we identified a second large copy number variant in three of five index patients, supporting an involvement of heterogeneous susceptibility alleles in the etiology of IGE. Significance We conclude that exon-disrupting deletions of NRXN1 represent a genetic risk factor in the genetically complex predisposition of common IGE syndromes.

Published
2013

7. Functional variants in HCN4 and CACNA1H may contribute to genetic generalized epilepsy.

Author

Becker, F, Reid, CA, Hallmann, K, Tae, H-S, Phillips, AM, Teodorescu, G, Weber, YG, Kleefuss-Lie, A, Elger, C, Perez-Reyes, E, Petrou, S, Kunz, WS, Lerche, H, Maljevic, S, Becker, F, Reid, CA, Hallmann, K, Tae, H-S, Phillips, AM, Teodorescu, G, Weber, YG, Kleefuss-Lie, A, Elger, C, Perez-Reyes, E, Petrou, S, Kunz, WS, Lerche, H, and Maljevic, S

Abstract

OBJECTIVE: Genetic generalized epilepsy (GGE) encompasses seizure disorders characterized by spike-and-wave discharges (SWD) originating within thalamo-cortical circuits. Hyperpolarization-activated (HCN) and T-type Ca2+ channels are key modulators of rhythmic activity in these brain regions. Here, we screened HCN4 and CACNA1H genes for potentially contributory variants and provide their functional analysis. METHODS: Targeted gene sequencing was performed in 20 unrelated familial cases with different subtypes of GGE, and the results confirmed in 230 ethnically matching controls. Selected variants in CACNA1H and HCN4 were functionally assessed in tsA201 cells and Xenopus laevis oocytes, respectively. RESULTS: We discovered a novel CACNA1H (p.G1158S) variant in two affected members of a single family. One of them also carried an HCN4 (p.P1117L) variant inherited from the unaffected mother. In a separate family, an HCN4 variant (p.E153G) was identified in one of several affected members. Voltage-clamp analysis of CACNA1H (p.G1158S) revealed a small but significant gain-of-function, including increased current density and a depolarizing shift of steady-state inactivation. HCN4 p.P1117L and p.G153E both caused a hyperpolarizing shift in activation and reduced current amplitudes, resulting in a loss-of-function. SIGNIFICANCE: Our results are consistent with a model suggesting cumulative contributions of subtle functional variations in ion channels to seizure susceptibility and GGE.

Published
2017

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

Author

Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothée, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., Sander, Thomas, Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothée, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., and Sander, Thomas

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, Pmeta = 2.5 × 10−9, OR[T] = 0.81) and 17q21.32 (rs72823592, Pmeta = 9.3 × 10−9, OR[A] = 0.77). The search for syndrome-related susceptibility alleles identified significant associations for GAEs at 2q22.3 (rs10496964, Pmeta = 9.1 × 10−9, OR[T] = 0.68) and at 1q43 for JME (rs12059546, Pmeta = 4.1 × 10−8, OR[G] = 1.42). Suggestive evidence for an association with GGEs was found in the region 2q24.3 (rs11890028, Pmeta = 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
2017

9. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Eva M. Reinthaler, Dennis Lal, Sebastien Lebon, Michael S. Hildebrand, Hans-Henrik M. Dahl, Brigid M. Regan, Martha Feucht, Hannelore Steinböck, Birgit Neophytou, Gabriel M. Ronen, Laurian Roche, Ursula Gruber-Sedlmayr, Julia Geldner, Edda Haberlandt, Per Hoffmann, Stefan Herms, Christian Gieger, Melanie Waldenberger, Andre Franke, Michael Wittig, Susanne Schoch, Albert J. Becker, Andreas Hahn, Katrin Männik, Mohammad R. Toliat, Georg Winterer, Holger Lerche, Peter Nürnberg, Heather Mefford, Ingrid E. Scheffer, Samuel F. Berkovic, Jacques S. Beckmann, Thomas Sander, Sebastien Jacquemont, Alexandre Reymond, Fritz Zimprich, Bernd A. Neubauer, Bernd Neubauer, Martina Mörzinger, Arvid Suls, Sarah Weckhuysen, Lieve Claes, Liesbet Deprez, Katrien Smets, Tine Van Dyck, Tine Deconinck, Peter De Jonghe, Rikke S Møller, Laura L. Klitten, Helle Hjalgrim, Kiel Campus, Ingo Helbig, Hiltrud Muhle, Philipp Ostertag, Sarah von Spiczak, Ulrich Stephani, Holger Trucks, Christian E. Elger, Ailing A. Kleefuß-Lie, Wolfram S. Kunz, Rainer Surges, Verena Gaus, Dieter Janz, Bettina Schmitz, Felix Rosenow, Karl Martin Klein, Philipp S. Reif, Wolfgang H. Oertel, Hajo M. Hamer, Felicitas Becker, Yvonne Weber, Bobby P.C. Koeleman, Carolien de Kovel, Dick Lindhout, Agnès Ameil, Joris Andrieux, Sonia Bouquillon, Odile Boute, Jeanne de Flandre, Jean Marie Cuisset, Jean-Christophe Cuvellier, Roger Salengro, Albert David, Bert de Vries, Marie-Ange Delrue, Martine Doco-Fenzy, Bridget A. Fernandez, Delphine Heron, Boris Keren, Robert Lebel, Bruno Leheup, Suzanne Lewis, Maria Antonietta Mencarelli, Cyril Mignot, Jean-Claude Minet, Alexandre Moerman, Fanny Morice-Picard, Mafalda Mucciolo, Katrin Ounap, Laurent Pasquier, Florence Petit, Francesca Ragona, Evica Rajcan-Separovic, Alessandra Renieri, Claudine Rieubland, Damien Sanlaville, Elisabeth Sarrazin, Yiping Shen, Mieke van Haelst, Anneke Vulto-van Silfhout, 16p11.2 European Consortium, EPICURE Consortium, EuroEPINOMICS Consortium, Reinthaler, EM., Zimprich, F., Feucht, M., Steinböck, H., Neophytou, B., Geldner, J., Gruber-Sedlmayr, U., Haberlandt, E., Ronen, GM., Roche, L., Lal, D., Nürnberg, P., Sander, T., Lerche, H., Neubauer, B., Mörzinger, M., Suls, A., Weckhuysen, S., Claes, L., Deprez, L., Smets, K., Van Dyck, T., Deconinck, T., De Jonghe, P., Møller, RS., Klitten, LL., Hjalgrim, H., Campus, K., Helbig, I., Muhle, H., Ostertag, P., von Spiczak, S., Stephani, U., Trucks, H., Elger, CE., Kleefuß-Lie, AA., Kunz, WS., Surges, R., Gaus, V., Janz, D., Schmitz, B., Rosenow, F., Klein, KM., Reif, PS., Oertel, WH., Hamer, HM., Becker, F., Weber, Y., Koeleman, BP., de Kovel, C., Lindhout, D., Ameil, A., Andrieux, J., Bouquillon, S., Boute, O., Cordier, MP., Cuisset, JM., Cuvellier, JC., David, A., de Vries, B., Delrue, MA., Doco-Fenzy, M., Fernandez, BA., Heron, D., Keren, B., Lebel, R., Leheup, B., Lewis, S., Mencarelli, MA., Mignot, C., Minet, JC., Moerman, A., Morice-Picard, F., Mucciolo, M., Ounap, K., Pasquier, L., Petit, F., Ragona, F., Rajcan-Separovic, E., Renieri, A., Rieubland, C., Sanlaville, D., Sarrazin, E., Shen, Y., van Haelst, M., Vulto-van Silfhout, A., and Other departments

Subjects
Male, DNA Copy Number Variations, Chromosomes, Human, Pair 22, 610 Medicine & health, Locus (genetics), Biology, Polymorphism, Single Nucleotide, Temporal lobe, Epilepsy, Gene duplication, Chromosome Duplication, Genetics, medicine, Humans, Copy-number variation, Child, Molecular Biology, Genetics (clinical), Chromosomes, Human, Pair 15, Infant, General Medicine, Odds ratio, medicine.disease, Epilepsy, Rolandic, Rolandic epilepsy, Exact test, Chromosomes, Human, Pair 1, Child, Preschool, Female, Chromosomes, Human, Pair 16
Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65,046 European population controls (5/393 cases versus 32/65,046 controls; Fisher's exact test P = 2.83 × 10(-6), odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10(-4)). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE.

Published
2014

10. Functional variants inHCN4andCACNA1Hmay contribute to genetic generalized epilepsy

Author

Becker, Felicitas, primary, Reid, Christopher A., additional, Hallmann, Kerstin, additional, Tae, Han-Shen, additional, Phillips, A. Marie, additional, Teodorescu, Georgeta, additional, Weber, Yvonne G., additional, Kleefuss-Lie, Ailing, additional, Elger, Christian, additional, Perez-Reyes, Edward, additional, Petrou, Steven, additional, Kunz, Wolfram S., additional, Lerche, Holger, additional, and Maljevic, Snezana, additional

Published
2017
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11. Investigation of GRIN2A in common epilepsy phenotypes

Author

Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, Sirén, Auli, Neuroscience Center, Research Programs Unit, Department of Medical and Clinical Genetics, Anna-Elina Lehesjoki / Principal Investigator, Research Programme for Molecular Neurology, Medicum, Institute for Molecular Medicine Finland, Aarno Palotie / Principal Investigator, Genomics of Neurological and Neuropsychiatric Disorders, Suls, Arvid, Weckhuysen, Sarah, Claes, Godelieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Epicure Consortium, and EuroEPINOMICS-CoGIE Consortium

Subjects
Pathology, Idiopathic generalized epilepsy, DEPDC5, Genotyping Techniques, CHILDHOOD, Bioinformatics, GRIN2A, 3124 Neurology and psychiatry, Cohort Studies, Epilepsy, 0302 clinical medicine, Databases, Genetic, Medicine, Copy-number variation, TERMINOLOGY, Non-U.S. Gov't, Temporal lobe epilepsy, FOCAL EPILEPSIES, Exome sequencing, Sanger sequencing, 0303 health sciences, Research Support, Non-U.S. Gov't, Phenotype, Neurology, symbols, Epilepsy, Generalized, medicine.medical_specialty, DNA Copy Number Variations, DISORDERS, Clinical Neurology, Research Support, Receptors, N-Methyl-D-Aspartate, CLASSIFICATION, Juvenile Absence Epilepsy, 03 medical and health sciences, symbols.namesake, Journal Article, Humans, Biology, 030304 developmental biology, business.industry, MUTATIONS, Copy number variation, 3112 Neurosciences, INCLUDING GRIN2A, medicine.disease, DELETIONS, Epilepsy, Absence, Epilepsy, Temporal Lobe, Epilepsy syndromes, Mutation, SEIZURES, Neurology (clinical), Human medicine, business, 030217 neurology & neurosurgery
Abstract

Recently, mutations and deletions in the GRIN2A gene have been identified to predispose to benign and severe idiopathic focal epilepsies (IFE), revealing a higher incidence of GRIN2A alterations among the more severe phenotypes. This study aimed to explore the phenotypic boundaries of GRIN2A mutations by investigating patients with the two most common epilepsy syndromes: (i) idiopathic generalized epilepsy (IGE) and (ii) temporal lobe epilepsy (TLE). Whole exome sequencing data of 238 patients with IGE as well as Sanger sequencing of 84 patients with TLE were evaluated for GRIN2A sequence alterations. Two additional independent cohorts comprising 1469 IGE and 330 TLE patients were screened for structural deletions (>40 kb) involving GRIN2A. Apart from a presumably benign, non-segregating variant in a patient with juvenile absence epilepsy, neither mutations nor deletions were detected in either cohort. These findings suggest that mutations in GRIN2A preferentially are involved in genetic variance of pediatric IFE and do not contribute significantly to either adult focal epilepsies as TLE or generalized epilepsies. (C) 2015 Elsevier B.V. All rights reserved.

Published
2015

12. Erratum: Exon-disrupting deletions of NRXN1 in idiopathic generalized epilepsy (Epilepsia (2013) 54 (256-264) DOI:10.1111/epi.12517)

Author

Møller, R. S., Weber, Y. G., Klitten, L. L., Trucks, H., Muhle, H., Kunz, W. S., Mefford, H. C., Franke, A., Kautza, M., Wolf, P., Dennig, D., Schreiber, S., Rückert, I. -M., Wichmann, H. -E., Ernst, J. P., Schurmann, C., Grabe, H. J., Tommerup, N., Stephani, U., Lerche, H., Hjalgrim, H., Helbig, I., Sander, T., Zimprich, F., Mörzinger, M., Feucht, M., Suls, A., Weckhuysen, S., Claes, L., Deprez, L., Smets, K., Van Dyck, T., Deconinck, T., De Jonghe, P., Velizarova, R., Dimova, P., Radionova, M., Tournev, I., Kancheva, D., Kaneva, R., Jordanova, A., Kjelgaard, D. B., Lehesjoki, A. -E., Siren, A., Baulac, S., Leguern, E., Von Spiczak, S., Ostertag, P., Leber, M., Leu, C., Toliat, M. R., Nürnberg, P., Hempelmann, A., Rüschendorf, F., Elger, C. E., Kleefuß-Lie, A. A., Surges, R., Gaus, V., Janz, D., Schmitz, B., Klein, K. M., Reif, P. S., Oertel, W. H., Hamer, H. M., Rosenow, F., Becker, F., Marini, C., Guerrini, R., Mei, D., Norci, V., Zara, F., Striano, P., Robbiano, A., Pezzella, M., Bianchi, A., Gambardella, A., Tinuper, P., La Neve, A., Capovilla, G., Vigliano, P., Crichiutti, G., Vanadia, F., Vignoli, A., Coppola, A., Striano, S., Giallonardo, M. T., Franceschetti, S., Belcastro, V., Benna, P., Coppola, G., De Palo, A., Ferlazzo, E., Vecchi, M., Martinelli, V., Bisulli, F., Beccaria, F., Del Giudice, E., Mancardi, M., Stranci, G., Scabar, A., Gobbi, G., Giordano, I., Koeleman, B. P. C., De Kovel, C., Lindhout, D., De Haan, G. -J., Ozbeck, U., Bebek, N., Baykan, B., Ozdemir, O., Ugur, S., Kocasoy-Orhan, E., Yücesan, E., Cine, N., Gokyigit, A., Gurses, C., Gul, G., Yapici, Z., Ozkara, C., Caglayan, H., Yalcin, O., Yalcin, D., Turkdogan, D., Dizdarer, G., Agan, K., Møller, R. S., Weber, Y. G., Klitten, L. L., Trucks, H., Muhle, H., Kunz, W. S., Mefford, H. C., Franke, A., Kautza, M., Wolf, P., Dennig, D., Schreiber, S., Rückert, I. -M., Wichmann, H. -E., Ernst, J. P., Schurmann, C., Grabe, H. J., Tommerup, N., Stephani, U., Lerche, H., Hjalgrim, H., Helbig, I., Sander, T., Zimprich, F., Mörzinger, M., Feucht, M., Suls, A., Weckhuysen, S., Claes, L., Deprez, L., Smets, K., Van Dyck, T., Deconinck, T., De Jonghe, P., Velizarova, R., Dimova, P., Radionova, M., Tournev, I., Kancheva, D., Kaneva, R., Jordanova, A., Kjelgaard, D. B., Lehesjoki, A. -E., Siren, A., Baulac, S., Leguern, E., Von Spiczak, S., Ostertag, P., Leber, M., Leu, C., Toliat, M. R., Nürnberg, P., Hempelmann, A., Rüschendorf, F., Elger, C. E., Kleefuß-Lie, A. A., Surges, R., Gaus, V., Janz, D., Schmitz, B., Klein, K. M., Reif, P. S., Oertel, W. H., Hamer, H. M., Rosenow, F., Becker, F., Marini, C., Guerrini, R., Mei, D., Norci, V., Zara, F., Striano, P., Robbiano, A., Pezzella, M., Bianchi, A., Gambardella, A., Tinuper, P., La Neve, A., Capovilla, G., Vigliano, P., Crichiutti, G., Vanadia, F., Vignoli, A., Coppola, A., Striano, S., Giallonardo, M. T., Franceschetti, S., Belcastro, V., Benna, P., Coppola, G., De Palo, A., Ferlazzo, E., Vecchi, M., Martinelli, V., Bisulli, F., Beccaria, F., Del Giudice, E., Mancardi, M., Stranci, G., Scabar, A., Gobbi, G., Giordano, I., Koeleman, B. P. C., De Kovel, C., Lindhout, D., De Haan, G. -J., Ozbeck, U., Bebek, N., Baykan, B., Ozdemir, O., Ugur, S., Kocasoy-Orhan, E., Yücesan, E., Cine, N., Gokyigit, A., Gurses, C., Gul, G., Yapici, Z., Ozkara, C., Caglayan, H., Yalcin, O., Yalcin, D., Turkdogan, D., Dizdarer, G., and Agan, K.

Published
2013

13. Genome-wide linkage meta-analysis identifies susceptibility loci at 2q34 and 13q31.3 for genetic generalized epilepsies

Author

EPICURE Consortium, Leu C., de Kovel C. G., Zara F., Striano P., Pezzella M., Robbiano A., Bianchi A., Coppola A., Giallonardo A. T., Beccaria F., Trenité D. K., Lindhout D., Gaus V., Schmitz B., Janz D., Weber Y. G., Becker F., Lerche H., Kleefuss Lie A. A., Hallman K., Kunz W. S., Elger C. E., Muhle H., Stephani U., Møller R. S., Hjalgrim H., Mullen S., Scheffer I. E., Berkovic S. F., Everett K. V., Gardiner M. R., Marini C., Guerrini R., Lehesjoki A. E., Siren A., Nabbout R., Baulac S., Leguern E., Serratosa J. M., Rosenow F., Feucht M., Unterberger I., Covanis A., Suls A., Weckhuysen S., Kaneva R., Caglayan H., Turkdogan D., Baykan B., Bebek N., Ozbek U., Hempelmann A., Schulz H., Rüschendorf F., Trucks H., Nürnberg P., Avanzini G., Koeleman B. P., Sander T., BISULLI, FRANCESCA, TINUPER, PAOLO, YÜCESAN, EMRAH, EPICURE Consortium, Leu C., de Kovel C.G., Zara F., Striano P., Pezzella M., Robbiano A., Bianchi A., Bisulli F., Coppola A., Giallonardo A.T., Beccaria F., Trenité D.K., Lindhout D., Gaus V., Schmitz B., Janz D., Weber Y.G., Becker F., Lerche H., Kleefuss-Lie A.A., Hallman K., Kunz W.S., Elger C.E., Muhle H., Stephani U., Møller R.S., Hjalgrim H., Mullen S., Scheffer I.E., Berkovic S.F., Everett K.V., Gardiner M.R., Marini C., Guerrini R., Lehesjoki A.E., Siren A., Nabbout R., Baulac S., Leguern E., Serratosa J.M., Rosenow F., Feucht M., Unterberger I., Covanis A., Suls A., Weckhuysen S., Kaneva R., Caglayan H., Turkdogan D., Baykan B., Bebek N., Ozbek U., Hempelmann A., Schulz H., Rüschendorf F., Trucks H., Nürnberg P., Avanzini G., Koeleman B.P., Sander T., and Tinuper P.

Subjects
Male, Chromosomes, Human, Pair 13, Genotype, Genetic Linkage, Chromosome Mapping, complex inheritance, Pedigree, genetic generalized epilepsy, myoclonic seizure, Phenotype, Genetic Loci, Chromosomes, Human, Pair 2, Humans, Epilepsy, Generalized, Family, Female, Genetic Predisposition to Disease, linkage analysis, absence seizure, Genome-Wide Association Study
Abstract

PURPOSE: Genetic generalized epilepsies (GGEs) have a lifetime prevalence of 0.3% with heritability estimates of 80%. A considerable proportion of families with siblings affected by GGEs presumably display an oligogenic inheritance. The present genome-wide linkage meta-analysis aimed to map: (1) susceptibility loci shared by a broad spectrum of GGEs, and (2) seizure type-related genetic factors preferentially predisposing to either typical absence or myoclonic seizures, respectively. METHODS: Meta-analysis of three genome-wide linkage datasets was carried out in 379 GGE-multiplex families of European ancestry including 982 relatives with GGEs. To dissect out seizure type-related susceptibility genes, two family subgroups were stratified comprising 235 families with predominantly genetic absence epilepsies (GAEs) and 118 families with an aggregation of juvenile myoclonic epilepsy (JME). To map shared and seizure type-related susceptibility loci, both nonparametric loci (NPL) and parametric linkage analyses were performed for a broad trait model (GGEs) in the entire set of GGE-multiplex families and a narrow trait model (typical absence or myoclonic seizures) in the subgroups of JME and GAE families. KEY FINDINGS: For the entire set of 379 GGE-multiplex families, linkage analysis revealed six loci achieving suggestive evidence for linkage at 1p36.22, 3p14.2, 5q34, 13q12.12, 13q31.3, and 19q13.42. The linkage finding at 5q34 was consistently supported by both NPL and parametric linkage results across all three family groups. A genome-wide significant nonparametric logarithm of odds score of 3.43 was obtained at 2q34 in 118 JME families. Significant parametric linkage to 13q31.3 was found in 235 GAE families assuming recessive inheritance (heterogeneity logarithm of odds = 5.02). SIGNIFICANCE: Our linkage results support an oligogenic predisposition of familial GGE syndromes. The genetic risk factor at 5q34 confers risk to a broad spectrum of familial GGE syndromes, whereas susceptibility loci at 2q34 and 13q31.3 preferentially predispose to myoclonic seizures or absence seizures, respectively. Phenotype- genotype strategies applying narrow trait definitions in phenotypic homogeneous subgroups of families improve the prospects of disentangling the genetic basis of common familial GGE syndromes.

Published
2012

14. Genome-wide linkage meta-analysis identifies susceptibility loci at 2q34 and 13q31.3 for genetic generalized epilepsies

Author

Leu C, de Kovel CG, Zara F, Striano P, Pezzella M, Robbiano A, Bianchi A, Bisulli F, Coppola A, Giallonardo AT, Beccaria F, Trenité DK, Lindhout D, Gaus V, Schmitz B, Janz D, Weber YG, Becker F, Lerche H, Kleefuss Lie AA, Hallman K, Kunz WS, Elger CE, Muhle H, Stephani U, Møller RS, Hjalgrim H, Mullen S, Scheffer IE, Berkovic SF, Everett KV, Gardiner MR, Marini C, Guerrini R, Lehesjoki AE, Siren A, Nabbout R, Baulac S, Leguern E, Serratosa JM, Rosenow F, Feucht M, Unterberger I, Covanis A, Suls A, Weckhuysen S, Kaneva R, Caglayan H, Turkdogan D, Baykan B, Bebek N, Ozbek U, Hempelmann A, Schulz H, Rüschendorf F, Trucks H, Nürnberg P, Avanzini G, Koeleman BP, Sander T, EPICURE Consortium, COPPOLA, ANTONIETTA, DEL GIUDICE, ENNIO, Leu, C, de Kovel, Cg, Zara, F, Striano, P, Pezzella, M, Robbiano, A, Bianchi, A, Bisulli, F, Coppola, A, Giallonardo, At, Beccaria, F, Trenité, Dk, Lindhout, D, Gaus, V, Schmitz, B, Janz, D, Weber, Yg, Becker, F, Lerche, H, Kleefuss Lie, Aa, Hallman, K, Kunz, W, Elger, Ce, Muhle, H, Stephani, U, Møller, R, Hjalgrim, H, Mullen, S, Scheffer, Ie, Berkovic, Sf, Everett, Kv, Gardiner, Mr, Marini, C, Guerrini, R, Lehesjoki, Ae, Siren, A, Nabbout, R, Baulac, S, Leguern, E, Serratosa, Jm, Rosenow, F, Feucht, M, Unterberger, I, Covanis, A, Suls, A, Weckhuysen, S, Kaneva, R, Caglayan, H, Turkdogan, D, Baykan, B, Bebek, N, Ozbek, U, Hempelmann, A, Schulz, H, Rüschendorf, F, Trucks, H, Nürnberg, P, Avanzini, G, Koeleman, Bp, Sander, T, Epicure, Consortium, DEL GIUDICE, Ennio, and Coppola, Antonietta

Published
2012

15. 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., Zara, F., Striano, P., Robbiano, A., Capovilla, G., Tinuper, P., Gambardella, A., Bianchi, A., La neve, A., Crichiutti, G., de kovel, C. G., Trenité, D. K. -N., de haan, G., Lindhout, D., Gaus, V., Schmitz, B., Janz, D., Weber, Y. G., Becker, F., Lerche, H., Steinhoff, B. J., Kleefuß-Lie, A. A., Kunz, W. S., Surges, R., Elger, C. E., Muhle, H., Von spiczak, S., Ostertag, P., Helbig, I., Stephani, U., Møller, R. S., Hjalgrim, H., Dibbens, L. M., Bellows, S., Oliver, K., Mullen, S., Scheffer, I. E., Berkovic, S. F., Everett, K. V., Gardiner, M. R., Marini, Chiara, Guerrini, R., Lehesjoki, A., Siren, A., Guipponi, M., Malafosse, A., Thomas, P., Nabbout, R., Baulac, S., Leguern, E., Guerrero, R., Serratosa, J. M., Reif, P. S., Rosenow, F., Mörzinger, M., Feucht, M., Zimprich, F., Kapser, C., Schankin, C. J., Suls, A., Smets, K., De jonghe, P., Jordanova, A., Caglayan, H., Yapici, Z., Yalcin, D. A., Baykan, B., Bebek, N., Ozbek, U., Gieger, C., Wichmann, H., Balschun, T., Ellinghaus, D., Franke, A., Meesters, C., Becker, T., Wienker, T. F., Hempelmann, A., Schulz, H., Rüschendorf, F., Leber, M., Pauck, S. M., Trucks, H., Toliat, M. R., Nürnberg, P., Avanzini, G., Koeleman, B. P., Sander, T., Weckhuysen, S., Claes, L., Deprez, L., Van Dyck, T., Deconinck, T., De Jonghe, P., Velizarova, R., Dimova, P., Radionova, M., Tournev, I., Kancheva, D., Kaneva, R., Lehesjoki, A. -E., von Spiczak, S., Martin Klein, K., Oertel, W. H., Hamer, H. M., Marini, C., Mei, D., Norci, V., Pezzella, M., La Neve, A., Vigliano, P., Vanadia, F., Vignoli, A., Coppola, A., Striano, S., Egeo, G., Teresa Giallonardo, M., Franceschetti, S., Belcastro, V., Benna, P., Coppola, G., De Palo, A., Ferlazzo, E., Vecchi, M., Martinelli, V., Bisulli, F., Beccaria, F., Del Giudice, E., Mancardi, M., Stranci, G., Scabar, A., Gobbi, G., Giordano, I., de Haan, G. -J., Giraldez, B. G., Ozbeck, U., Ozdemir, O., Ugur, S., Kocasoy-Orhan, E., Yücesan, E., Cine, N., Gokyigit, A., Gurses, C., Gul, G., Ozkara, C., Yalcin, O., Turkdogan, D., Dizdarer, G., Agan, K., Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Frederico, Dibbens, Leanne Michelle, Sander, Thomas, EPICURE Consortium, Epicure, Consortium, DEL GIUDICE, Ennio, Steffens, M, Leu, C, Ruppert, Ak, Zara, F, Striano, P, Robbiano, A., Coppola, Antonietta, E. P. I. C. U. R. E. Consortium, E. M. I.Net Consortium, M. Steffen, C. Leu, A. Ruppert, F. Zara, P. Striano, A. Robbiano, G. Capovilla, P. Tinuper, A. Gambardella, A. Bianchi, A. L. Neve, G. Crichiutti, C. G. F, D. K. Trenité, G. d. Haan, D. Lindhout, V. Gau, B. Schmitz, D. Janz, Y. G. Weber, F. Becker, H. Lerche, B. J. Steinhoff, A. A. Kleefuß-Lie, W. S. Kunz, R. Surge, C. E. Elger, H. Muhle, S. v. Spiczak, P. Ostertag, I. Helbig, U. Stephani, R. S. Møller, H. Hjalgrim, L. M. Dibben, S. Bellow, K. Oliver, S. Mullen, I. E. Scheffer, S. F. Berkovic, K. V. Everett, M. R. Gardiner, C. Marini, R. Guerrini, A. Lehesjoki, A. Siren, M. Guipponi, A. Malafosse, P. Thoma, R. Nabbout, S. Baulac, E. Leguern, R. Guerrero, J. M. Serratosa, P. S. Reif, F. Rosenow, M. Mörzinger, M. Feucht, F. Zimprich, C. Kapser, C. J. Schankin, A. Sul, K. Smet, P. D. Jonghe, A. Jordanova, H. Caglayan, Z. Yapici, D. A. Yalcin, B. Baykan, N. Bebek, U. Ozbek, C. Gieger, H. Wichmann, T. Balschun, D. Ellinghau, A. Franke, C. Meester, T. Becker, T. F. Wienker, A. Hempelmann, H. Schulz, F. Rüschendorf, M. Leber, S. M. Pauck, H. Truck, M. R. Toliat, P. Nürnberg, G. Avanzini, B. P. C, and T. Sander

Subjects
Candidate gene, Juvenile, Genome-wide association study, Alleles, Epilepsy, ZEB2 protein, human, VRK2 protein, human, 0302 clinical medicine, genetics [Genetic Predisposition to Disease], genetics, Humans, Myoclonic Epilepsy, genetics [Epilepsy, Generalized], SCN1A protein, human, Genetics (clinical), Genetics, 0303 health sciences, genetics [Epilepsy, Absence], Myoclonic Epilepsy, Juvenile, genetics, Genetic Predisposition to Disease, General Medicine, Protein-Serine-Threonine Kinases, 3. Good health, Chemistry, Absence, genetics, Epilepsy, genetics [Myoclonic Epilepsy, Juvenile], Epilepsy, Generalized, genetics [Receptor, Muscarinic M3], genetics, NAV1.1 Voltage-Gated Sodium Channel, genetics [Homeodomain Proteins], Single-nucleotide polymorphism, genetics [NAV1.1 Voltage-Gated Sodium Channel], Protein Serine-Threonine Kinases, Biology, genetics [Protein-Serine-Threonine Kinases], 03 medical and health sciences, ddc:570, Genetic variation, medicine, Humans, Genetic Predisposition to Disease, genetics, Repressor Protein, Allele, Molecular Biology, Alleles, Zinc Finger E-box Binding Homeobox 2, 030304 developmental biology, Homeodomain Proteins, Receptor, Muscarinic M3, genetics, Protein-Serine-Threonine Kinase, genetics, Receptor, Generalized, genetics, Genome-Wide Association Study, Homeodomain Protein, Heritability, medicine.disease, NAV1.1 Voltage-Gated Sodium Channel, Repressor Proteins, genetics [Repressor Proteins], Muscarinic M3, Epilepsy, Absence, Myoclonic epilepsy, Human medicine, Juvenile myoclonic epilepsy, 030217 neurology & neurosurgery, Genome-Wide Association Study
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

16. 15q13.3 microdeletions increase risk of idiopathic generalized epilepsy

Author

Heather C Mefford, Pierre Thomas, Bobby P. C. Koeleman, Fritz Zimprich, Peter Nürnberg, Philipp S. Reif, Carolien G.F. de Kovel, Michael Wittig, Yvonne G. Weber, Ines Steinich, Pierre Genton, Carl Baker, Helle Hjalgrim, Gerrit-Jan de Haan, Ingo Helbig, Alain Malafosse, Thomas Sander, Michel Guipponi, Ulrich Stephani, Daniela Luciano, Costin Leu, Verena Gaus, Stefan Schreiber, Bettina Schmitz, Corrado Romano, Christian E. Elger, Frank Visscher, Hiltrud Muhle, Katherine L. Kron, Andre Franke, Evan E. Eichler, Holger Lerche, Andrew J. Sharp, Lydia Urak, Ailing A. Kleefuß-Lie, Rikke S. Møller, Martha Feucht, Karl Martin Klein, Michael Nothnagel, Karoline Fuchs, Marco Fichera, Sarah von Spiczak, Felix Rosenow, and Dick Lindhout

Subjects
Adult, Male, Pediatrics, medicine.medical_specialty, Adolescent, alpha7 Nicotinic Acetylcholine Receptor, Receptors, Nicotinic, Article, Idiopathic generalized epilepsy, ddc:616.89, Young Adult, Epilepsy, Epilepsy, Generalized/*genetics, Receptors, Nicotinic/genetics, Risk Factors, Internal medicine, Intellectual disability, Genetics, medicine, Humans, ddc:576.5, Genetic Predisposition to Disease, Risk factor, Child, Chromosomes, Human, Pair 15, Comparative Genomic Hybridization, biology, CHRNA7, Case-control study, Chromosome Deletion, medicine.disease, Endocrinology, Schizophrenia, Case-Control Studies, Child, Preschool, biology.protein, Autism, Epilepsy, Generalized, Female
Abstract

We identified 15q13.3 microdeletions encompassing the CHRNA7 gene in 12 of 1,223 individuals with idiopathic generalized epilepsy (IGE), which were not detected in 3,699 controls (joint P = 5.32 x 10(-8)). Most deletion carriers showed common IGE syndromes without other features previously associated with 15q13.3 microdeletions, such as intellectual disability, autism or schizophrenia. Our results indicate that 15q13.3 microdeletions constitute the most prevalent risk factor for common epilepsies identified to date.

Published
2009

17. Lateralizing value of behavioral arrest in patients with temporal lobe epilepsy

Author

Christian E. Elger, Ailing A. Kleefuss-Lie, and Judith M. Hoffmann

Subjects
Adult, Male, Video Recording, Behavioral Symptoms, Electroencephalography, Functional Laterality, Temporal lobe, Behavioral Neuroscience, Seizure onset, Epilepsy, Ictal semiology, Humans, Medicine, In patient, Epileptogenic focus, Analysis of Variance, medicine.diagnostic_test, Adult patients, business.industry, Middle Aged, medicine.disease, nervous system diseases, Epilepsy, Temporal Lobe, Neurology, Anesthesia, Female, Neurology (clinical), business
Abstract

Analysis of ictal semiology is essential to presurgical evaluation of patients with epilepsy. To assess the localizing value of behavioral arrest in temporal lobe epilepsy (TLE), we analyzed 107 video/EEG monitoring-documented seizures of 107 adult patients with TLE for a set of defined seizure phenomena with respect to frequency and sequence of occurrence in relation to epileptogenic (mesial vs extramesial, left vs right) origin. Behavioral arrest was observed more frequently in left-sided temporal seizures: 25.7% of left-sided mesial seizures and 25.0% of left-sided extramesial seizures exhibited behavioral arrest, whereas only 3.4% of right-sided mesial seizures and 10.5% of right-sided extramesial seizures were associated with behavioral arrest. In addition, occurence of behavioral arrest within the sequence of seizure phenomena was remarkably consistent, being observed mainly as the first apparent feature of seizure onset. Thus, behavioral arrest is a valuable early indicator of a left-sided temporal epileptogenic focus in adult patients with TLE.

Published
2008

18. Investigation of GRIN2A in common epilepsy phenotypes

Author

Genetica Groep Koeleman, Circulatory Health, Child Health, Brain, Genetica Klinische Genetica, Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, Sirén, Auli, Genetica Groep Koeleman, Circulatory Health, Child Health, Brain, Genetica Klinische Genetica, Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, and Sirén, Auli

Published
2015

19. Genome-wide linkage meta-analysis identifies susceptibility loci at 2q34 and 13q31.3 for genetic generalized epilepsies

Author

Leu, Costin, de Kovel, Carolien G F, Zara, Federico, Striano, Pasquale, Pezzella, Marianna, Robbiano, Angela, Bianchi, Amedeo, Bisulli, Francesca, Coppola, Antonietta, Giallonardo, Anna Teresa, Beccaria, Francesca, Trenité, Dorothée Kasteleijn-Nolst, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G, Becker, Felicitas, Lerche, Holger, Kleefuss-Lie, Ailing A, Hallman, Kerstin, Kunz, Wolfram S, Elger, Christian E, Muhle, Hiltrud, Stephani, Ulrich, Møller, Rikke S, Hjalgrim, Helle, Mullen, Saul, Scheffer, Ingrid E, Berkovic, Samuel F, Everett, Kate V, Gardiner, Mark R, Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Serratosa, Jose M, Rosenow, Felix, Feucht, Martha, Unterberger, Iris, Covanis, Athanasios, Suls, Arvid, Weckhuysen, Sarah, Kaneva, Radka, Caglayan, Hande, Turkdogan, Dilsad, and Baykan, Betul

Subjects
Male, Chromosomes, Human, Pair 13, Genotype, Genetic Linkage, Chromosome Mapping, Pedigree, Phenotype, Genetic Loci, Chromosomes, Human, Pair 2, Humans, Epilepsy, Generalized, Family, Female, Genetic Predisposition to Disease, Genome-Wide Association Study
Abstract

Purpose: Genetic generalized epilepsies (GGEs) have a lifetime prevalence of 0.3% with heritability estimates of 80%. A considerable proportion of families with siblings affected by GGEs presumably display an oligogenic inheritance. The present genome-wide linkage meta-analysis aimed to map: (1) susceptibility loci shared by a broad spectrum of GGEs, and (2) seizure typerelated genetic factors preferentially predisposing to either typical absence or myoclonic seizures, respectively. Methods: Meta-analysis of three genome-wide linkage datasets was carried out in 379 GGE-multiplex families of European ancestry including 982 relatives with GGEs. To dissect out seizure type-related susceptibility genes, two family subgroups were stratified comprising 235 families with predominantly genetic absence epilepsies (GAEs) and 118 families with an aggregation of juvenile myoclonic epilepsy (JME). To map shared and seizure type-related susceptibility loci, both nonparametric loci (NPL) and parametric linkage analyses were performed for a broad trait model (GGEs) in the entire set of GGE-multiplex families and a narrow trait model (typical absence or myoclonic seizures) in the subgroups of JME and GAE families. Key Findings: For the entire set of 379 GGE-multiplex families, linkage analysis revealed six loci achieving suggestive evidence for linkage at 1p36.22, 3p14.2, 5q34, 13q12.12, 13q31.3, and 19q13.42. The linkage finding at 5q34 was consistently supported by both NPL and parametric linkage results across all three family groups. A genome-wide significant nonparametric logarithm of odds score of 3.43 was obtained at 2q34 in 118 JME families. Significant parametric linkage to 13q31.3 was found in 235 GAE families assuming recessive inheritance (heterogeneity logarithm of odds = 5.02). Significance: Our linkage results support an oligogenic predisposition of familial GGE syndromes. The genetic risk factor at 5q34 confers risk to a broad spectrum of familial GGE syndromes, whereas susceptibility loci at 2q34 and 13q31.3 preferentially predispose to myoclonic seizures or absence seizures, respectively. Phenotype-genotype strategies applying narrow trait definitions in phenotypic homogeneous subgroups of families improve the prospects of disentangling the genetic basis of common familial GGE syndromes.

Published
2012

20. Recurrent microdeletions at 15q11.2 and 16p13.11 predispose to idiopathic generalized epilepsies

Author

Dick Lindhout, Sarah von Spiczak, Heather C Mefford, Ina Maria Rückert, Martha Feucht, Lydia Urak, Christian Kluck, Peter De Jonghe, Hajo M. Hamer, Fritz Zimprich, Tanja Obermeier, Marielle E M Swinkels, Arvid Suls, Evan E. Eichler, Ingo Helbig, Ailing A. Kleefuß-Lie, Felix Rosenow, Carolien G.F. de Kovel, Ulrich Stephani, Heinz Erich Wichmann, Michael Steffens, Kerstin Hallmann, Stefan Schreiber, Thomas Sander, Helle Hjalgrim, Karoline Fuchs, Bobby P. C. Koeleman, Christian E. Elger, Holger Trucks, Karl Martin Klein, Eva H. Brilstra, Andre Franke, Dorothée G.A. Kasteleijn-Nolst Trenité, Yvonne G. Weber, Costin Leu, Hiltrud Muhle, Verena Gaus, Iris Unterberger, Rikke S. Møller, Peter Nürnberg, Carl Baker, Holger Lerche, and Philipp Ostertag

Subjects
Male, medicine.medical_specialty, Adolescent, Parenteral transmission, Single-nucleotide polymorphism, Biology, Epileptogenesis, Idiopathic generalized epilepsy, Cohort Studies, Epilepsy, Young Adult, Internal medicine, medicine, Humans, Genetic Predisposition to Disease, Child, Genetics, Chromosomes, Human, Pair 15, Odds ratio, medicine.disease, Pedigree, Child, Preschool, Etiology, Epilepsy, Generalized, Female, Neurology (clinical), Human medicine, Chromosome Deletion, Chromosomes, Human, Pair 16, Comparative genomic hybridization
Abstract

Idiopathic generalized epilepsies account for 30% of all epilepsies. Despite a predominant genetic aetiology, the genetic factors predisposing to idiopathic generalized epilepsies remain elusive. Studies of structural genomic variations have revealed a significant excess of recurrent microdeletions at 1q21.1, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 in various neuropsychiatric disorders including autism, intellectual disability and schizophrenia. Microdeletions at 15q13.3 have recently been shown to constitute a strong genetic risk factor for common idiopathic generalized epilepsy syndromes, implicating that other recurrent microdeletions may also be involved in epileptogenesis. This study aimed to investigate the impact of five microdeletions at the genomic hotspot regions 1q21.1, 15q11.2, 16p11.2, 16p13.11 and 22q11.2 on the genetic risk to common idiopathic generalized epilepsy syndromes. The candidate microdeletions were assessed by high-density single nucleotide polymorphism arrays in 1234 patients with idiopathic generalized epilepsy from North-western Europe and 3022 controls from the German population. Microdeletions were validated by quantitative polymerase chain reaction and their breakpoints refined by array comparative genomic hybridization. In total, 22 patients with idiopathic generalized epilepsy (1.8%) carried one of the five novel microdeletions compared with nine controls (0.3%) (odds ratio = 6.1; 95% confidence interval 2.8-13.2; chi(2) = 26.7; 1 degree of freedom; P = 2.4 x 10(-7)). Microdeletions were observed at 1q21.1 [Idiopathic generalized epilepsy (IGE)/control: 1/1], 15q11.2 (IGE/control: 12/6), 16p11.2 IGE/control: 1/0, 16p13.11 (IGE/control: 6/2) and 22q11.2 (IGE/control: 2/0). Significant associations with IGEs were found for the microdeletions at 15q11.2 (odds ratio = 4.9; 95% confidence interval 1.8-13.2; P = 4.2 x 10(-4)) and 16p13.11 (odds ratio = 7.4; 95% confidence interval 1.3-74.7; P = 0.009). Including nine patients with idiopathic generalized epilepsy in this cohort with known 15q13.3 microdeletions (IGE/control: 9/0), parental transmission could be examined in 14 families. While 10 microdeletions were inherited (seven maternal and three paternal transmissions), four microdeletions occurred de novo at 15q13.3 (n = 1), 16p13.11 (n = 2) and 22q11.2 (n = 1). Eight of the transmitting parents were clinically unaffected, suggesting that the microdeletion itself is not sufficient to cause the epilepsy phenotype. Although the microdeletions investigated are individually rare (

Published
2010

21. CLCN2 variants in idiopathic generalized epilepsy

Author

Dieter Janz, Peter Propping, Gerhard Müller-Newen, Alexi K. Alekov, Stefan Beyenburg, Fritz Haverkamp, JS Dullinger, Maike Warnstedt, Ailing A. Kleefuss-Lie, Holger Lerche, Birgit Rau, Christian Kubisch, Johannes Rebstock, Karsten Haug, Waltraut Friedl, Steve Horvath, Christoph Fahlke, Kerstin Hallmann, Thomas Sander, Bernd Giese, Simon Hebeisen, Barbara Poser, Snezana Maljevic, Alfredo Ramirez, Christian E. Elger, Sven Cichon, and Herbert Schulz

Subjects
Male, Heterozygote, DNA Mutational Analysis, Computational biology, Idiopathic generalized epilepsy, Text mining, Chloride Channels, Genetics, medicine, Humans, Genetic Predisposition to Disease, Genetic Testing, Genes, Dominant, CLCN2, Family Health, biology, business.industry, Genetic Variation, medicine.disease, DNA Fingerprinting, Pedigree, CLC-2 Chloride Channels, Electrophysiology, biology.protein, Epilepsy, Generalized, Female, business
Published
2009

22. The localizing value of hypersalivation and postictal coughing in temporal lobe epilepsy

Author

Ailing A. Kleefuss-Lie, Judith M. Hoffmann, and Christian E. Elger

Subjects
Hypersalivation, Adult, Male, Video Recording, Electroencephalography, Functional Laterality, Temporal lobe, Central nervous system disease, Epilepsy, stomatognathic system, Ictal semiology, Seizures, medicine, Humans, Age of Onset, Analysis of Variance, medicine.diagnostic_test, Sialorrhea, Middle Aged, medicine.disease, Temporal Lobe, nervous system diseases, Diffusion Magnetic Resonance Imaging, Treatment Outcome, nervous system, Neurology, Cough, Epilepsy, Temporal Lobe, Anesthesia, Preoperative Period, Female, Neurology (clinical), medicine.symptom, Age of onset, Psychology, Eeg monitoring, psychological phenomena and processes
Abstract

Analysis of ictal semiology is essential to presurgical evaluation of epilepsy patients providing information on seizure origin. To assess the significance of hypersalivation and postictal coughing for seizure origin in temporal lobe epilepsy (TLE), we analyzed video/EEG monitoring documented seizures of 107 adult patients for these seizure elements with respect to frequency and sequence of occurrence in relation to epileptogenic origin, comparing mesial versus extra-mesial and left versus right. Hypersalivation was rare, but occurred exclusively in seizures of mesial origin (9.4%). Comparison between left (11.4%) and right (6.9%) mesial origin was statistically insignificant. Postictal coughing also occurred exclusively in seizures of mesial onset (6.3%). Again, comparison between left (5.7%) and right (6.9%) mesial seizure onset was statistically insignificant. Thus, hypersalivation and postictal coughing are rare seizure phenomena in TLE, but their occurrence strongly support mesial seizure origin.

Published
2009

23. Familial and sporadic 15q13.3 microdeletions in idiopathic generalized epilepsy: precedent for disorders with complex inheritance

Author

Dibbens, Lm, Mullen, S, Helbig, I, Mefford, Hc, Bayly, Ma, Bellows, S, Leu, C, Trucks, H, Obermeier, T, Wittig, M, Franke, A, Caglayan, H, Yapici, Z, Sander, T, Eichler, Ee, Scheffer, Ie, Mulley, Jc, Berkovic, Sf, De Jonghe, P, Suls, A, Hjalgrim, H, Madsen, Jm, Møller, Rs, Lehesjoki, Ae, Siren, A, Gaus, V, Janz, D, Schmitz, B, Elger, Ce, Hallmann, K, Kleefuß-Lie, Aa, Kunz, Ws, Raabe, A, Muhle, H, Ostertag, P, von Spiczak, S, Stephani, U, Lerche, H, Weber, Yg, Striano, P, Zara, F, Marini, C, Brilstra, Eh, Kastelijn-Nolst, Trenité, Koeleman, D, Bpc, de Kovel, Cgf, Lindhout, D, Swinkels, Mem, Yalcin, O, Baykan, B, Turkdogan, D, Dizdarer, G, Ozkara, C, Lee, Y, Müller-Quernheim, J, Fölster-Holst, R, Hofmann, S, Nebel, A., Schreiber, S, Schürmann, M, Rodriguez, E, Weidinger, S, Baurecht, H, Lie, Ba, Boberg, Km, Karlsen, Th., De Jonghe, Peter, Suls, Arvid, Dibbens, Leanne M, Mullen, Saul, Helbig, Ingo, Mefford, Heather C, Bayly, Marta A, Bellows, Susannah, Leu, Costin, Trucks, Holger, Obermeier, Tanja, Wittig, Michael, Franke, Andre, Caglayan, Hande, Yapici, Zuhal, Sander, Thomas, Eichler, Evan E, Scheffer, Ingrid E, Mulley, John C, and Berkovic, Samuel F

Subjects
Male, Proband, Clinical Sciences, idiopathic generalized epilepsy, European Continental Ancestry Group, Single-nucleotide polymorphism, Pedigree chart, family studies, Biology, White People, Cohort Studies, Idiopathic generalized epilepsy, Epilepsy, single nucleotide polymorphism, genetic inheritance, Genetics, medicine, inheritance, Humans, SNP, Genetic Predisposition to Disease, Molecular Biology, Genetics (clinical), seizures, Chromosomes, Human, Pair 15, Articles, General Medicine, 5q13.3 deletions, medicine.disease, Penetrance, Pedigree, Female, Human medicine, microdeletion, Chromosome Deletion, Comparative genomic hybridization
Abstract

Microdeletion at chromosomal position 15q13.3 has been described in intellectual disability, autism spectrum disorders, schizophrenia and recently in idiopathic generalized epilepsy (IGE). Using independent IGE cohorts, we first aimed to confirm the association of 15q13.3 deletions and IGE. We then set out to determine the relative occurrence of sporadic and familial cases and to examine the likelihood of having seizures for individuals with the microdeletion in familial cases. The 15q13.3 microdeletion was identified in 7 of 539 (1.3%) unrelated cases of IGE using quantitative PCR or SNP arrays and confirmed by array comparative genomic hybridization analysis using probes specific to the 15q13.3 region. The inheritance of this lesion was tracked using family studies. Of the seven microdeletions identified in probands, three were de novo, two were transmitted from an unaffected parent and in two cases the parents were unavailable. Non-penetrance of the microdeletion was identified in 4/7 pedigrees and three pedigrees included other family members with IGE who lacked the 15q13.3 deletion. The odds ratio is 68 (95% confidence interval 29-181), indicating a pathogenic lesion predisposing to epilepsy with complex inheritance and incomplete penetrance for the IGE component of the phenotype in multiplex families. Refereed/Peer-reviewed

Published
2009

24. Role of GRM4 in idiopathic generalized epilepsies analysed by genetic association and sequence analysis

Author

Verena Gaus, Sarah von Spiczak, Holger Lerche, Ailing A. Kleefuss-Lie, Andre Franke, Ingo Helbig, Stefan Schreiber, Christian E. Elger, Thomas Sander, Yvonne G. Weber, Hiltrud Muhle, Serife Kara, Jochen Hampe, and Ulrich Stephani

Subjects
Adult, Male, Candidate gene, Sequence analysis, Population, Single-nucleotide polymorphism, Biology, Receptors, Metabotropic Glutamate, Polymorphism, Single Nucleotide, Epilepsy, Reflex, Childhood absence epilepsy, Gene Frequency, Germany, medicine, Humans, Genetic Predisposition to Disease, education, Child, Genetic association, Genetics, education.field_of_study, Haplotype, Myoclonic Epilepsy, Juvenile, Sequence Analysis, DNA, medicine.disease, Neurology, Epilepsy, Absence, Case-Control Studies, Immunology, Epilepsy, Generalized, Female, Neurology (clinical), Juvenile myoclonic epilepsy
Abstract

Summary Background GRM4 encoding the group III metabotropic glutamate receptor 4 (mGluR4), is located on the chromosomal segment 6p21.3 where tentative susceptibility loci for Juvenile Myoclonic Epilepsy (JME) and Photoparoxysmal Response (PPR) have been mapped. The present candidate gene study examined if variation in GRM4 confers susceptibility to IGE. Patients and methods The case-control association sample included 564 unrelated IGE patients and 733 population controls of German descent. Association analysis was carried out for 17 single nucleotide polymorphisms (SNPs) covering the genomic GRM4 sequence for all IGE patients as well as for two common IGE subsyndromes [Juvenile Myoclonic Epilepsy (JME, n =215) and Childhood Absence Epilepsy (CAE, n =175)]. Sequence analysis was performed in 85 IGE and 42 PPR cases and 44 controls. Results Nominally significant asssociations were detected between IGE and seven GRM4 SNPs (with P -values ranging from 0.037 to 0.0036), between JME and five SNPs ( P =0.042–0.0106), and between CAE and two SNPs ( P =0.0466–0.0021). Four novel SNPs were identified by sequence analysis. Conclusions Our association findings support the hypothesis that GRM4 sequence variants might confer low-risk effects to the etiology of IGE. A minor pathogenetic contribution of the examined variants is possible. These exploratory findings warrant further replication analyses.

Published
2008

26. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., primary, Lal, Dennis, additional, Lebon, Sebastien, additional, Hildebrand, Michael S., additional, Dahl, Hans-Henrik M., additional, Regan, Brigid M., additional, Feucht, Martha, additional, Steinböck, Hannelore, additional, Neophytou, Birgit, additional, Ronen, Gabriel M., additional, Roche, Laurian, additional, Gruber-Sedlmayr, Ursula, additional, Geldner, Julia, additional, Haberlandt, Edda, additional, Hoffmann, Per, additional, Herms, Stefan, additional, Gieger, Christian, additional, Waldenberger, Melanie, additional, Franke, Andre, additional, Wittig, Michael, additional, Schoch, Susanne, additional, Becker, Albert J., additional, Hahn, Andreas, additional, Männik, Katrin, additional, Toliat, Mohammad R., additional, Winterer, Georg, additional, Lerche, Holger, additional, Nürnberg, Peter, additional, Mefford, Heather, additional, Scheffer, Ingrid E., additional, Berkovic, Samuel F., additional, Beckmann, Jacques S., additional, Sander, Thomas, additional, Jacquemont, Sebastien, additional, Reymond, Alexandre, additional, Zimprich, Fritz, additional, Neubauer, Bernd A., additional, Reinthaler, Eva M., additional, Neubauer, Bernd, additional, Mörzinger, Martina, additional, Suls, Arvid, additional, Weckhuysen, Sarah, additional, Claes, Lieve, additional, Deprez, Liesbet, additional, Smets, Katrien, additional, Van Dyck, Tine, additional, Deconinck, Tine, additional, De Jonghe, Peter, additional, Møller, Rikke S, additional, Klitten, Laura L., additional, Hjalgrim, Helle, additional, Campus, Kiel, additional, Helbig, Ingo, additional, Muhle, Hiltrud, additional, Ostertag, Philipp, additional, von Spiczak, Sarah, additional, Stephani, Ulrich, additional, Trucks, Holger, additional, Elger, Christian E., additional, Kleefuß-Lie, Ailing A., additional, Kunz, Wolfram S., additional, Surges, Rainer, additional, Gaus, Verena, additional, Janz, Dieter, additional, Schmitz, Bettina, additional, Rosenow, Felix, additional, Klein, Karl Martin, additional, Reif, Philipp S., additional, Oertel, Wolfgang H., additional, Hamer, Hajo M., additional, Becker, Felicitas, additional, Weber, Yvonne, additional, Koeleman, Bobby P.C., additional, de Kovel, Carolien, additional, Lindhout, Dick, additional, Ameil, Agnès, additional, Andrieux, Joris, additional, Bouquillon, Sonia, additional, Boute, Odile, additional, de Flandre, Jeanne, additional, Cuisset, Jean Marie, additional, Cuvellier, Jean-Christophe, additional, Salengro, Roger, additional, David, Albert, additional, de Vries, Bert, additional, Delrue, Marie-Ange, additional, Doco-Fenzy, Martine, additional, Fernandez, Bridget A., additional, Heron, Delphine, additional, Keren, Boris, additional, Lebel, Robert, additional, Leheup, Bruno, additional, Lewis, Suzanne, additional, Mencarelli, Maria Antonietta, additional, Mignot, Cyril, additional, Minet, Jean-Claude, additional, Moerman, Alexandre, additional, Morice-Picard, Fanny, additional, Mucciolo, Mafalda, additional, Ounap, Katrin, additional, Pasquier, Laurent, additional, Petit, Florence, additional, Ragona, Francesca, additional, Rajcan-Separovic, Evica, additional, Renieri, Alessandra, additional, Rieubland, Claudine, additional, Sanlaville, Damien, additional, Sarrazin, Elisabeth, additional, Shen, Yiping, additional, van Haelst, Mieke, additional, and Silfhout, Anneke Vulto-van, additional

Published
2014
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27. Genome-wide association analysis of genetic generalized epilepsies implicates susceptibility loci at 1q43, 2p16.1, 2q22.3 and 17q21.32

Author

Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G. F., Trenite, Dorothee Kasteleijn-Nolst, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuss-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Moller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Moerzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rueschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nuernberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P. C., Sander, Thomas, Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G. F., Trenite, Dorothee Kasteleijn-Nolst, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuss-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Moller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Moerzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rueschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nuernberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P. C., and Sander, Thomas

Abstract

Genetic generalized epilepsies (GGEs) have a lifetime prevalence of 0.3 and account for 2030 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

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

Author

EPICURE Consortium, EMINet Consortium, Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothee, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., Sander, Thomas, EPICURE Consortium, EMINet Consortium, Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothee, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., and Sander, Thomas

Published
2012

29. 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

30. Recurrent microdeletions at 15q11.2 and 16p13.11 predispose to idiopathic generalized epilepsies

Author

de Kovel, Carolien G F, Trucks, Holger, Helbig, Ingo, Mefford, Heather C, Baker, Carl, Leu, Costin, Kluck, Christian, Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Obermeier, Tanja, Kleefuss-Lie, Ailing A, Hallmann, Kerstin, Steffens, Michael, Gaus, Verena, Klein, Karl M, Hamer, Hajo M, Rosenow, Felix, Brilstra, Eva H, Trenité, Dorothée Kasteleijn-Nolst, Swinkels, Marielle E M, Weber, Yvonne G, Unterberger, Iris, Zimprich, Fritz, Urak, Lydia, Feucht, Martha, Fuchs, Karoline, Møller, Rikke S, Hjalgrim, Helle, De Jonghe, Peter, Suls, Arvid, Rückert, Ina-Maria, Wichmann, Heinz-Erich, Franke, Andre, Schreiber, Stefan, Nürnberg, Peter, Elger, Christian E, Lerche, Holger, Stephani, Ulrich, Koeleman, Bobby P C, Lindhout, Dick, Eichler, Evan E, Sander, Thomas, de Kovel, Carolien G F, Trucks, Holger, Helbig, Ingo, Mefford, Heather C, Baker, Carl, Leu, Costin, Kluck, Christian, Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Obermeier, Tanja, Kleefuss-Lie, Ailing A, Hallmann, Kerstin, Steffens, Michael, Gaus, Verena, Klein, Karl M, Hamer, Hajo M, Rosenow, Felix, Brilstra, Eva H, Trenité, Dorothée Kasteleijn-Nolst, Swinkels, Marielle E M, Weber, Yvonne G, Unterberger, Iris, Zimprich, Fritz, Urak, Lydia, Feucht, Martha, Fuchs, Karoline, Møller, Rikke S, Hjalgrim, Helle, De Jonghe, Peter, Suls, Arvid, Rückert, Ina-Maria, Wichmann, Heinz-Erich, Franke, Andre, Schreiber, Stefan, Nürnberg, Peter, Elger, Christian E, Lerche, Holger, Stephani, Ulrich, Koeleman, Bobby P C, Lindhout, Dick, Eichler, Evan E, and Sander, Thomas

Abstract

Idiopathic generalized epilepsies account for 30% of all epilepsies. Despite a predominant genetic aetiology, the genetic factors predisposing to idiopathic generalized epilepsies remain elusive. Studies of structural genomic variations have revealed a significant excess of recurrent microdeletions at 1q21.1, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 in various neuropsychiatric disorders including autism, intellectual disability and schizophrenia. Microdeletions at 15q13.3 have recently been shown to constitute a strong genetic risk factor for common idiopathic generalized epilepsy syndromes, implicating that other recurrent microdeletions may also be involved in epileptogenesis. This study aimed to investigate the impact of five microdeletions at the genomic hotspot regions 1q21.1, 15q11.2, 16p11.2, 16p13.11 and 22q11.2 on the genetic risk to common idiopathic generalized epilepsy syndromes. The candidate microdeletions were assessed by high-density single nucleotide polymorphism arrays in 1234 patients with idiopathic generalized epilepsy from North-western Europe and 3022 controls from the German population. Microdeletions were validated by quantitative polymerase chain reaction and their breakpoints refined by array comparative genomic hybridization. In total, 22 patients with idiopathic generalized epilepsy (1.8%) carried one of the five novel microdeletions compared with nine controls (0.3%) (odds ratio = 6.1; 95% confidence interval 2.8-13.2; chi(2) = 26.7; 1 degree of freedom; P = 2.4 x 10(-7)). Microdeletions were observed at 1q21.1 [Idiopathic generalized epilepsy (IGE)/control: 1/1], 15q11.2 (IGE/control: 12/6), 16p11.2 IGE/control: 1/0, 16p13.11 (IGE/control: 6/2) and 22q11.2 (IGE/control: 2/0). Significant associations with IGEs were found for the microdeletions at 15q11.2 (odds ratio = 4.9; 95% confidence interval 1.8-13.2; P = 4.2 x 10(-4)) and 16p13.11 (odds ratio = 7.4; 95% confidence interval 1.3-74.7; P = 0.009). Including nine patients with

Published
2010

31. 15q13.3 microdeletions increase risk of idiopathic generalized epilepsy

Author

Helbig, Ingo, Mefford, Heather C, Sharp, Andrew J, Guipponi, Michel, Fichera, Marco, Franke, Andre, Muhle, Hiltrud, de Kovel, Carolien, Baker, Carl, von Spiczak, Sarah, Kron, Katherine L, Steinich, Ines, Kleefuss-Lie, Ailing A, Leu, Costin, Gaus, Verena, Schmitz, Bettina, Klein, Karl M, Reif, Philipp S, Rosenow, Felix, Weber, Yvonne, Lerche, Holger, Zimprich, Fritz, Urak, Lydia, Fuchs, Karoline, Feucht, Martha, Genton, Pierre, Thomas, Pierre, Visscher, Frank, de Haan, Gerrit-Jan, Møller, Rikke S, Hjalgrim, Helle, Luciano, Daniela, Wittig, Michael, Nothnagel, Michael, Elger, Christian E, Nürnberg, Peter, Romano, Corrado, Malafosse, Alain, Koeleman, Bobby P C, Lindhout, Dick, Stephani, Ulrich, Schreiber, Stefan, Eichler, Evan E, Sander, Thomas, Helbig, Ingo, Mefford, Heather C, Sharp, Andrew J, Guipponi, Michel, Fichera, Marco, Franke, Andre, Muhle, Hiltrud, de Kovel, Carolien, Baker, Carl, von Spiczak, Sarah, Kron, Katherine L, Steinich, Ines, Kleefuss-Lie, Ailing A, Leu, Costin, Gaus, Verena, Schmitz, Bettina, Klein, Karl M, Reif, Philipp S, Rosenow, Felix, Weber, Yvonne, Lerche, Holger, Zimprich, Fritz, Urak, Lydia, Fuchs, Karoline, Feucht, Martha, Genton, Pierre, Thomas, Pierre, Visscher, Frank, de Haan, Gerrit-Jan, Møller, Rikke S, Hjalgrim, Helle, Luciano, Daniela, Wittig, Michael, Nothnagel, Michael, Elger, Christian E, Nürnberg, Peter, Romano, Corrado, Malafosse, Alain, Koeleman, Bobby P C, Lindhout, Dick, Stephani, Ulrich, Schreiber, Stefan, Eichler, Evan E, and Sander, Thomas

Abstract

Udgivelsesdato: 2009-Feb, We identified 15q13.3 microdeletions encompassing the CHRNA7 gene in 12 of 1,223 individuals with idiopathic generalized epilepsy (IGE), which were not detected in 3,699 controls (joint P = 5.32 x 10(-8)). Most deletion carriers showed common IGE syndromes without other features previously associated with 15q13.3 microdeletions, such as intellectual disability, autism or schizophrenia. Our results indicate that 15q13.3 microdeletions constitute the most prevalent risk factor for common epilepsies identified to date.

Published
2009

32. Role of GRM4 in idiopathic generalized epilepsies analysed by genetic association and sequence analysis

Author

Muhle, Hiltrud, primary, von Spiczak, Sarah, additional, Gaus, Verena, additional, Kara, Serife, additional, Helbig, Ingo, additional, Hampe, Jochen, additional, Franke, Andre, additional, Weber, Yvonne, additional, Lerche, Holger, additional, Kleefuss-Lie, Ailing A., additional, Elger, Christian E., additional, Schreiber, Stefan, additional, Stephani, Ulrich, additional, and Sander, Thomas, additional

Published
2010
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33. Recurrent microdeletions at 15q11.2 and 16p13.11 predispose to idiopathic generalized epilepsies

Author

de Kovel, C. G. F., primary, Trucks, H., additional, Helbig, I., additional, Mefford, H. C., additional, Baker, C., additional, Leu, C., additional, Kluck, C., additional, Muhle, H., additional, von Spiczak, S., additional, Ostertag, P., additional, Obermeier, T., additional, Kleefuss-Lie, A. A., additional, Hallmann, K., additional, Steffens, M., additional, Gaus, V., additional, Klein, K. M., additional, Hamer, H. M., additional, Rosenow, F., additional, Brilstra, E. H., additional, Kasteleijn-Nolst Trenite, D., additional, Swinkels, M. E. M., additional, Weber, Y. G., additional, Unterberger, I., additional, Zimprich, F., additional, Urak, L., additional, Feucht, M., additional, Fuchs, K., additional, Moller, R. S., additional, Hjalgrim, H., additional, De Jonghe, P., additional, Suls, A., additional, Ruckert, I.-M., additional, Wichmann, H.-E., additional, Franke, A., additional, Schreiber, S., additional, Nurnberg, P., additional, Elger, C. E., additional, Lerche, H., additional, Stephani, U., additional, Koeleman, B. P. C., additional, Lindhout, D., additional, Eichler, E. E., additional, and Sander, T., additional

Published
2009
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34. CLCN2 variants in idiopathic generalized epilepsy

Author

Kleefuß-Lie, Ailing, primary, Friedl, Waltraut, additional, Cichon, Sven, additional, Haug, Karsten, additional, Warnstedt, Maike, additional, Alekov, Alexi, additional, Sander, Thomas, additional, Ramirez, Alfredo, additional, Poser, Barbara, additional, Maljevic, Snezana, additional, Hebeisen, Simon, additional, Kubisch, Christian, additional, Rebstock, Johannes, additional, Horvath, Steve, additional, Hallmann, Kerstin, additional, Dullinger, Jörn S, additional, Rau, Birgit, additional, Haverkamp, Fritz, additional, Beyenburg, Stefan, additional, Schulz, Herbert, additional, Janz, Dieter, additional, Giese, Bernd, additional, Müller-Newen, Gerhard, additional, Propping, Peter, additional, Elger, Christian E, additional, Fahlke, Christoph, additional, and Lerche, Holger, additional

Published
2009
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35. 15q13.3 microdeletions increase risk of idiopathic generalized epilepsy

Author

Helbig, Ingo, primary, Mefford, Heather C, additional, Sharp, Andrew J, additional, Guipponi, Michel, additional, Fichera, Marco, additional, Franke, Andre, additional, Muhle, Hiltrud, additional, de Kovel, Carolien, additional, Baker, Carl, additional, von Spiczak, Sarah, additional, Kron, Katherine L, additional, Steinich, Ines, additional, Kleefuß-Lie, Ailing A, additional, Leu, Costin, additional, Gaus, Verena, additional, Schmitz, Bettina, additional, Klein, Karl M, additional, Reif, Philipp S, additional, Rosenow, Felix, additional, Weber, Yvonne, additional, Lerche, Holger, additional, Zimprich, Fritz, additional, Urak, Lydia, additional, Fuchs, Karoline, additional, Feucht, Martha, additional, Genton, Pierre, additional, Thomas, Pierre, additional, Visscher, Frank, additional, de Haan, Gerrit-Jan, additional, Møller, Rikke S, additional, Hjalgrim, Helle, additional, Luciano, Daniela, additional, Wittig, Michael, additional, Nothnagel, Michael, additional, Elger, Christian E, additional, Nürnberg, Peter, additional, Romano, Corrado, additional, Malafosse, Alain, additional, Koeleman, Bobby P C, additional, Lindhout, Dick, additional, Stephani, Ulrich, additional, Schreiber, Stefan, additional, Eichler, Evan E, additional, and Sander, Thomas, additional

Published
2009
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36. Recurrent microdeletions at 15q11.2 and 16p13.11 predispose to idiopathic generalized epilepsies.

Author

de Kovel, Carolien G. F., Trucks, Holger, Helbig, Ingo, Mefford, Heather C., Baker, Carl, Leu, Costin, Kluck, Christian, Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Obermeier, Tanja, Kleefuß-Lie, Ailing A., Hallmann, Kerstin, Steffens, Michael, Gaus, Verena, Klein, Karl M., Hamer, Hajo M., Rosenow, Felix, Brilstra, Eva H., and Trenité, Dorothée Kasteleijn-Nolst

Subjects
EPILEPSY, GENETIC disorders, PHENOTYPES, NEUROPSYCHIATRY, GENETIC polymorphisms
Abstract

Idiopathic generalized epilepsies account for 30% of all epilepsies. Despite a predominant genetic aetiology, the genetic factors predisposing to idiopathic generalized epilepsies remain elusive. Studies of structural genomic variations have revealed a significant excess of recurrent microdeletions at 1q21.1, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 in various neuropsychiatric disorders including autism, intellectual disability and schizophrenia. Microdeletions at 15q13.3 have recently been shown to constitute a strong genetic risk factor for common idiopathic generalized epilepsy syndromes, implicating that other recurrent microdeletions may also be involved in epileptogenesis. This study aimed to investigate the impact of five microdeletions at the genomic hotspot regions 1q21.1, 15q11.2, 16p11.2, 16p13.11 and 22q11.2 on the genetic risk to common idiopathic generalized epilepsy syndromes. The candidate microdeletions were assessed by high-density single nucleotide polymorphism arrays in 1234 patients with idiopathic generalized epilepsy from North-western Europe and 3022 controls from the German population. Microdeletions were validated by quantitative polymerase chain reaction and their breakpoints refined by array comparative genomic hybridization. In total, 22 patients with idiopathic generalized epilepsy (1.8%) carried one of the five novel microdeletions compared with nine controls (0.3%) (odds ratio = 6.1; 95% confidence interval 2.8–13.2; χ2 = 26.7; 1 degree of freedom; P = 2.4 × 10−7). Microdeletions were observed at 1q21.1 [Idiopathic generalized epilepsy (IGE)/control: 1/1], 15q11.2 (IGE/control: 12/6), 16p11.2 IGE/control: 1/0, 16p13.11 (IGE/control: 6/2) and 22q11.2 (IGE/control: 2/0). Significant associations with IGEs were found for the microdeletions at 15q11.2 (odds ratio = 4.9; 95% confidence interval 1.8–13.2; P = 4.2 × 10−4) and 16p13.11 (odds ratio = 7.4; 95% confidence interval 1.3–74.7; P = 0.009). Including nine patients with idiopathic generalized epilepsy in this cohort with known 15q13.3 microdeletions (IGE/control: 9/0), parental transmission could be examined in 14 families. While 10 microdeletions were inherited (seven maternal and three paternal transmissions), four microdeletions occurred de novo at 15q13.3 (n = 1), 16p13.11 (n = 2) and 22q11.2 (n = 1). Eight of the transmitting parents were clinically unaffected, suggesting that the microdeletion itself is not sufficient to cause the epilepsy phenotype. Although the microdeletions investigated are individually rare (<1%) in patients with idiopathic generalized epilepsy, they collectively seem to account for a significant fraction of the genetic variance in common idiopathic generalized epilepsy syndromes. The present results indicate an involvement of microdeletions at 15q11.2 and 16p13.11 in epileptogenesis and strengthen the evidence that recurrent microdeletions at 15q11.2, 15q13.3 and 16p13.11 confer a pleiotropic susceptibility effect to a broad range of neuropsychiatric disorders. [ABSTRACT FROM PUBLISHER]

Published
2010
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37. Analysis of the initial ictal phenomenon in patients with temporal lobe epilepsy

Author

Judith M. Hoffmann, Ailing A. Kleefuss-Lie, and Christian E. Elger

Subjects
Adult, Male, medicine.medical_specialty, Mesial, Aura, Clinical Neurology, Electroencephalography, Audiology, Temporal lobe, Epilepsy, Seizure onset, stomatognathic system, Ictal semiology, medicine, Humans, In patient, Ictal, Temporal lobe epilepsy, medicine.diagnostic_test, business.industry, First ictal phenomenon, Extra-mesial, Chronological, General Medicine, medicine.disease, nervous system diseases, stomatognathic diseases, Neurology, Epilepsy, Temporal Lobe, nervous system, Anesthesia, Female, Neurology (clinical), business, psychological phenomena and processes
Abstract

We aimed to assess the localizing value of the initial semiological element in temporal lobe epilepsy (TLE). Video-EEG-documented seizures of 97 adult TLE patients were studied in relation to seizure origin (left versus right; mesial versus extra-mesial). Strikingly, seizures with mesial onset started with very few ictal phenomena, while seizures of extra-mesial origin began with a larger variety of ictal elements. Furthermore, following noticeable distributions were observed for the mesial group: (i) aura was the most common initial ictal phenomenon in the total patient collective, occurring significantly more frequently in mesial than in extra-mesial seizure onset. Aura appeared most often in seizures of left mesial origin. (ii) Vocalization presented a trend towards mesial left seizure origin. (iii) Oral automatisms showed a trend towards mesial seizure origin. Following noticeable distribution was observed for the extra-mesial group: In patients without aura, restlessness as initial ictal phenomenon appeared exclusively in seizures of extra-mesial right origin. Finally, behavioral arrest showed a trend towards left-sided seizure origin. In conclusion, the initial ictal element may add useful information concerning differentiation of seizure onset in TLE.

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

Author

Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothée, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., Sander, Thomas, Steffens, Michael, Leu, Costin, Ruppert, Ann-Kathrin, Zara, Federico, Striano, Pasquale, Robbiano, Angela, Capovilla, Giuseppe, Tinuper, Paolo, Gambardella, Antonio, Bianchi, Amedeo, La Neve, Angela, Crichiutti, Giovanni, de Kovel, Carolien G.F., Kasteleijn-Nolst Trenité, Dorothée, de Haan, Gerrit-Jan, Lindhout, Dick, Gaus, Verena, Schmitz, Bettina, Janz, Dieter, Weber, Yvonne G., Becker, Felicitas, Lerche, Holger, Steinhoff, Bernhard J., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Elger, Christian E., Muhle, Hiltrud, von Spiczak, Sarah, Ostertag, Philipp, Helbig, Ingo, Stephani, Ulrich, Møller, Rikke S., Hjalgrim, Helle, Dibbens, Leanne M., Bellows, Susannah, Oliver, Karen, Mullen, Saul, Scheffer, Ingrid E., Berkovic, Samuel F., Everett, Kate V., Gardiner, Mark R., Marini, Carla, Guerrini, Renzo, Lehesjoki, Anna-Elina, Siren, Auli, Guipponi, Michel, Malafosse, Alain, Thomas, Pierre, Nabbout, Rima, Baulac, Stephanie, Leguern, Eric, Guerrero, Rosa, Serratosa, Jose M., Reif, Philipp S., Rosenow, Felix, Mörzinger, Martina, Feucht, Martha, Zimprich, Fritz, Kapser, Claudia, Schankin, Christoph J., Suls, Arvid, Smets, Katrin, De Jonghe, Peter, Jordanova, Albena, Caglayan, Hande, Yapici, Zuhal, Yalcin, Destina A., Baykan, Betul, Bebek, Nerses, Ozbek, Ugur, Gieger, Christian, Wichmann, Heinz-Erich, Balschun, Tobias, Ellinghaus, David, Franke, Andre, Meesters, Christian, Becker, Tim, Wienker, Thomas F., Hempelmann, Anne, Schulz, Herbert, Rüschendorf, Franz, Leber, Markus, Pauck, Steffen M., Trucks, Holger, Toliat, Mohammad R., Nürnberg, Peter, Avanzini, Giuliano, Koeleman, Bobby P.C., and Sander, Thomas

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, Pmeta = 2.5 × 10−9, OR[T] = 0.81) and 17q21.32 (rs72823592, Pmeta = 9.3 × 10−9, OR[A] = 0.77). The search for syndrome-related susceptibility alleles identified significant associations for GAEs at 2q22.3 (rs10496964, Pmeta = 9.1 × 10−9, OR[T] = 0.68) and at 1q43 for JME (rs12059546, Pmeta = 4.1 × 10−8, OR[G] = 1.42). Suggestive evidence for an association with GGEs was found in the region 2q24.3 (rs11890028, Pmeta = 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

39. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, Silfhout, Anneke Vulto-van, Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65 046 European population controls (5/393 cases versus 32/65 046 controls; Fisher's exact test P = 2.83 × 10−6, odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10−4). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE

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