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Arch Neurol. 2002 Jul;59(7):1137-41.

A splice-site mutation in GABRG2 associated with childhood absence epilepsy and febrile convulsions.

Author information

  • 1Institute of Human Genetics, University Hospital Bonn, Rheinische Friedrich Wilhelms-University Bonn, Germany.

Abstract

CONTEXT:

Missense mutations in the GABRG2 gene, which encodes the gamma 2 subunit of central nervous gamma-aminobutyric acid (GABA)(A) receptors, have recently been described in 2 families with idiopathic epilepsy. In one of these families, the affected individuals predominantly exhibited childhood absence epilepsy and febrile convulsions.

OBJECTIVE:

To assess the role of GABRG2 in the genetic predisposition to idiopathic absence epilepsies.

DESIGN:

The GABRG2 gene was screened by single-strand conformation analysis for mutations. Furthermore, a population-based association study assessing a common exon 5 polymorphism (C588T) was carried out.

PATIENTS:

The sample was composed of 135 patients with idiopathic absence epilepsy and 154 unrelated and ethnically matched controls.

RESULTS:

A point mutation (IVS6 + 2T-->G) leading to a splice-donor site mutation in intron 6 was found. The mutation, which is predicted to lead to a nonfunctional protein, cosegregates with the disease status in a family with childhood absence epilepsy and febrile convulsions. The association study did not find any significant differences in the allele and genotype frequencies of the common exon 5 polymorphism (C588T) between patients with idiopathic absence epilepsy and controls (P>.35).

CONCLUSIONS:

Our study identified a splice-donor-site mutation that was probably causing a nonfunctional GABRG2 subunit. This mutation occurred in heterozygosity in the affected members of a single nuclear family, exhibiting a phenotypic spectrum of childhood absence epilepsy and febrile convulsions. The GABRG2 gene seems to confer a rare rather than a frequent major susceptibility effect to common idiopathic absence epilepsy syndromes.

PMID:
12117362
[PubMed - indexed for MEDLINE]
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