Genetic mapping of a major susceptibility locus for juvenile myoclonic epilepsy on chromosome 15q.

Abstract:

:The epilepsies are a group of disorders characterised by recurrent seizures caused by episodes of abnormal neuronal hyperexcitability involving the brain. Up to 60 million people are affected worldwide and genetic factors may contribute to the aetiology in up to 40% of patients. The most common human genetic epilepsies display a complex pattern of inheritance. These are categorised as idiopathic in the absence of detectable structural or metabolic abnormalities. Juvenile myoclonic epilepsy (JME) is a distinctive and common variety of familial idiopathic generalised epilepsy (IGE) with a prevalence of 0.5-1.0 per 1000 and a ratio of sibling risk to population prevalence (lambda(s)) of 42. The molecular genetic basis of these familial idiopathic epilepsies is entirely unknown, but a mutation in the gene CHRNA4, encoding the alpha4 subunit of the neuronal nicotinic acetylcholine receptor (nAChR), was recently identified in a rare Mendelian variety of idiopathic epilepsy. Chromosomal regions harbouring genes for nAChR subunits were therefore tested for linkage to the JME trait in 34 pedigrees. Significant evidence for linkage with heterogeneity was found to polymorphic loci encompassing the region in which the gene encoding the alpha7 subunit of nAChR (CHRNA7) maps on chromosome 15q14 (HLOD = 4.4 at alpha = 0.65; Z(all) = 2.94, P = 0.0005). This major locus contributes to genetic susceptibility to JME in a majority of the families studied.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Elmslie FV,Rees M,Williamson MP,Kerr M,Kjeldsen MJ,Pang KA,Sundqvist A,Friis ML,Chadwick D,Richens A,Covanis A,Santos M,Arzimanoglou A,Panayiotopoulos CP,Curtis D,Whitehouse WP,Gardiner RM

doi

10.1093/hmg/6.8.1329

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

1329-34

issue

8

eissn

0964-6906

issn

1460-2083

pii

dda157

journal_volume

6

pub_type

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