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Mutations in STX1B, encoding a presynaptic protein, cause fever-associated epilepsy syndromes

Item Type:Article
Title:Mutations in STX1B, encoding a presynaptic protein, cause fever-associated epilepsy syndromes
Creators Name:Schubert, J., Siekierska, A., Langlois, M., May, P., Huneau, C., Becker, F., Muhle, H., Suls, A., Lemke, J.R., de Kovel, C.G.F., Thiele, H., Konrad, K., Kawalia, A., Toliat, M.R., Sander, T., Rueschendorf, F., Caliebe, A., Nagel, I., Kohl, B., Kecskes, A., Jacmin, M., Hardies, K., Weckhuysen, S., Riesch, E., Dorn, T., Brilstra, E.H., Baulac, S., Moller, R.S., Hjalgrim, H., Koeleman, B.P.C., Jurkat-Rott, K., Lehman-Horn, F., Roach, J.C., Glusman, G., Hood, L., Galas, D.J., Martin, B., de Witte, P.A.M., Biskup, S., De Jonghe, P., Helbig, I., Balling, R., Nuernberg, P., Crawford, A.D., Esguerra, C.V., Weber, Y.G. and Lerche, H.
Abstract:Febrile seizures affect 2-4% of all children and have a strong genetic component. Recurrent mutations in three main genes (SCN1A, SCN1B and GABRG2) have been identified that cause febrile seizures with or without epilepsy. Here we report the identification of mutations in STX1B, encoding syntaxin-1B, that are associated with both febrile seizures and epilepsy. Whole-exome sequencing in independent large pedigrees identified cosegregating STX1B mutations predicted to cause an early truncation or an in-frame insertion or deletion. Three additional nonsense or missense mutations and a de novo microdeletion encompassing STX1B were then identified in 449 familial or sporadic cases. Video and local field potential analyses of zebrafish larvae with antisense knockdown of stx1b showed seizure-like behavior and epileptiform discharges that were highly sensitive to increased temperature. Wild-type human syntaxin-1B but not a mutated protein rescued the effects of stx1b knockdown in zebrafish. Our results thus implicate STX1B and the presynaptic release machinery in fever-associated epilepsy syndromes.
Keywords:Amino Acid Sequence, Cohort Studies, Comparative Genomic Hybridization, DNA Sequence Analysis, Epilepsy, Exome, Febrile Seizures, Gene Deletion, Genetic Linkage, In Situ Hybridization, Molecular Sequence Data, Mutation, Nonsense Codon, Pedigree, Phenotype, Single Nucleotide Polymorphism, Syntaxin 1, Temperature, Animals, Zebrafish
Source:Nature Genetics
Publisher:Nature Publishing Group
Page Range:1327-1332
Date:December 2014
Official Publication:https://doi.org/10.1038/ng.3130
PubMed:View item in PubMed

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