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

Raquel Rabionet, Leopoldo Zelante, Núria López-Bigas, Leonardo D'Agruma, Salvatore Melchionda, Gabriella Restagno, Maria Lourdes Arbonés, Paolo Gasparini, Xavier Estivill

Research output: Contribution to journalArticlepeer-review


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 1152 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, 167deIT, 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.

Original languageEnglish
Pages (from-to)40-44
Number of pages5
JournalHuman Genetics
Issue number1
Publication statusPublished - 2000

ASJC Scopus subject areas

  • Genetics(clinical)
  • Genetics


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