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Molecular basis of childhood deafness resulting from mutations in the GJB2 (connexin 26) gene.

Abstract：

:Mutations in the GJB2 gene have been identified in many patients with childhood deafness, 35delG being the most common mutation in Caucasoid populations. We have analyzed a total of 576 families/unrelated patients with recessive or sporadic deafness from Italy and Spain, 193 of them being referred as autosomal recessive, and the other 383 as apparently sporadic cases (singletons). Of the 1,152 unrelated GJB2 chromosomes analyzed from these patients, 37% had GJB2 mutations. Twenty-three different mutations were detected (1 in-frame deletion, 4 nonsense, 5 frameshift, and 13 missense mutations). Mutation 35delG was the most common, accounting for 82% of all GJB2 deafness alleles. The relative frequency of 35delG in Italy and Spain was different, representing 88% of the alleles in Italian patients and only 55% in the Spanish cases. Eight non-35delG mutations were detected more than once (V37I, E47X, 167delT, L90P, 312de114, 334delAA, R143W, and R184P), with relative frequencies ranging between 0.5 and 1.6% of the GJB2 deafness alleles. The information based on conservation of amino acid residues, coexistence with a second GJB2 mutation or absence of the mutation in non-deaf control subjects, suggests that most of these missense changes should be responsible for the deafness phenotype.

journal_name

Hum Genet

journal_title

Human genetics

authors

Rabionet R,Zelante L,López-Bigas N,D'Agruma L,Melchionda S,Restagno G,Arbonés ML,Gasparini P,Estivill X

doi

10.1007/s004390051007

keywords:

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

40-4

issue

1

eissn

0340-6717

issn

1432-1203

journal_volume

106

pub_type

杂志文章

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