A novel C202F mutation in the connexin26 gene (GJB2) associated with autosomal dominant isolated hearing loss
- Laurette Morléa,
- Muriel Bozona,
- Nicole Alloisioa,
- Philippe Latourb,
- Antoon Vandenbergheb,
- Henri Plauchuc,
- Lionel Colletd,
- Patrick Ederya,c,
- Jacqueline Godeta,
- Geneviève Lina-Granaded
- aCentre de Génétique Moléculaire et Cellulaire, CNRS UMR 5534, Université Claude Bernard-Lyon I, 43 Boulevard du 11 novembre 1918, 69622 Villeurbanne, France, bUnité de Neurogénétique Moléculaire, Hôpital de l'Antiquaille, 69321 Lyon Cédex 05, France, cService de Génétique, Hospices Civils de Lyon, Hôpital Hôtel-Dieu, 69288 Lyon Cédex 02, France, dLaboratoire Neurosciences et Systèmes Sensoriels, UPRESA CNRS 5020, Hôpital Edouard Herriot, 69347 Lyon Cédex 03, France
- Dr Morlé, l-morle{at}univ-lyon1.fr
- Revised 15 October 1999
- Accepted 18 October 1999
Abstract
Mutations in the GJB2 gene encoding connexin26 (CX26) account for up to 50% of cases of autosomal recessive hearing loss. In contrast, only one GJB2mutation has been reported to date in an autosomal dominant form of isolated prelingual hearing loss. We report here a novel heterozygous 605G→T mutation in GJB2 in all affected members of a large family with late childhood onset of autosomal dominant isolated hearing loss. The resulting C202F substitution, which lies in the fourth (M4) transmembrane domain of CX26, may impair connexin oligomerisation. Finally, our study suggests that GJB2 should be screened for heterozygous mutations in patients with autosomal dominant isolated hearing impairment, whatever the severity of the disease.
