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De novo mutations in the gene encoding STXBP1 (MUNC18-1) cause early infantile epileptic encephalopathy.

Authors: Saitsu, Hirotomo  Kato, Mitsuhiro  Mizuguchi, Takeshi  Hamada, Keisuke  Osaka, Hitoshi  Tohyama, Jun  Uruno, Katsuhisa  Kumada, Satoko  Nishiyama, Kiyomi  Nishimura, Akira  Okada, Ippei  Yoshimura, Yukiko  Hirai, Syu-ichi  Kumada, Tatsuro  Hayasaka, Kiyoshi  Fukuda, Atsuo  Ogata, Kazuhiro  Matsumoto, Naomichi 
Citation: Saitsu H, etal., Nat Genet. 2008 Jun;40(6):782-8. doi: 10.1038/ng.150. Epub 2008 May 11.
Pubmed: (View Article at PubMed) PMID:18469812
DOI: Full-text: DOI:10.1038/ng.150

Early infantile epileptic encephalopathy with suppression-burst (EIEE), also known as Ohtahara syndrome, is one of the most severe and earliest forms of epilepsy. Using array-based comparative genomic hybridization, we found a de novo 2.0-Mb microdeletion at 9q33.3-q34.11 in a girl with EIEE. Mutation analysis of candidate genes mapped to the deletion revealed that four unrelated individuals with EIEE had heterozygous missense mutations in the gene encoding syntaxin binding protein 1 (STXBP1). STXBP1 (also known as MUNC18-1) is an evolutionally conserved neuronal Sec1/Munc-18 (SM) protein that is essential in synaptic vesicle release in several species. Circular dichroism melting experiments revealed that a mutant form of the protein was significantly thermolabile compared to wild type. Furthermore, binding of the mutant protein to syntaxin was impaired. These findings suggest that haploinsufficiency of STXBP1 causes EIEE.

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CRRD Object Information
CRRD ID: 12903960
Created: 2017-05-11
Species: All species
Last Modified: 2017-05-11
Status: ACTIVE



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