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Generalized epilepsy as a phenotype of GABAA receptor channelopathy Kiyonobu Komai 1 1Department of Neurology and Neurobiology of Aging, Kanazawa University Graduate School of Medical Science Keyword: epilepsy , GABAAreceptor , channelopathy pp.231-237
Published Date 2003/4/10
DOI https://doi.org/10.11477/mf.1431100302
  • Abstract
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 The idiopathic generalized epilepsies(IGE)are the most common neurological disorders. IGE have significant genetic factors which indicated by studies of family aggregation and twins. Recent studies have revealed some missense mutations on GABAAreceptor genes in different syndromes, which include generalized epilepsy with febrile seizures(GEFS plus), childhood absence epilepsy and febrile seizures, and juvenile myoclonic epilepsy. At least, four different mutations(R43Q, K289 M, Q351X, splice-donor site mutation in intron 6)in the GABAAreceptor gamma-2 subunit gene and one mutation(A322D)in the alpha-1 subunit gene have been reported. Electrophysiological studies have showed R43Q diminish the diazepam response of GABAAreceptor channel, while K289 M and A322D cause marked decrement in the amplitude of GABA-activated currents. Q351X completely abolish the GABA sensitivity of mutant GABAAreceptor channel through disassemble of alpha-1 and beta-2 subunits in endoplasmic reticulum. There are striking phenotypic heterogeneity in families with gamma-2 subunit gene mutation, while phenotypic heterogeneity is not prominent with A322D mutation. Further studies should be promoted to elucidate the correlation between phenotype of GABAAreceptor mutation and genotype, or clinicophysiological natures.


Copyright © 2003, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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