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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Connexin 31 (GJB3) is expressed in the peripheral and auditory nerves and causes neuropathy and hearing impairment.

Mutations in the connexin 31 (GJB3) gene have been found in subjects with dominant and recessive deafness and in patients with erythrokeratodermia variabilis. We report here a dominant mutation in the GJB3 gene (D66del) in a family affected with peripheral neuropathy and sensorineural hearing impairment. A wide range of disease severity for peripheral neuropathy, from asymptomatic cases to subjects with chronic skin ulcers in their feet and osteomyelitis leading to amputations, was detected in D66del patients. Mild, often asymmetrical, hearing impairment was found in all but one patient with mutation D66del of this family and the same mutation was present in an independent family ascertained because of hearing impairment. We have found mouse connexin 31 ( Gjb3) gene expression in the cochlea and in the auditory and sciatic nerves, showing a pattern similar to that of Gjb1 ( connexin 32), of which the human ortholog (GJB1) is involved in X-linked peripheral neuropathy. This expression pattern, together with auditory-evoked brainstem anomalous response in D66del patients, indicates that hearing impairment due to GJB3 mutations involves alterations in both the cochlea and the auditory nerve. Peripheral neuropathy is the third phenotypic alteration linked to GJB3 mutations, which enlarges the list of genes that cause this group of heterogeneous disorders.[1]


  1. Connexin 31 (GJB3) is expressed in the peripheral and auditory nerves and causes neuropathy and hearing impairment. López-Bigas, N., Olivé, M., Rabionet, R., Ben-David, O., Martínez-Matos, J.A., Bravo, O., Banchs, I., Volpini, V., Gasparini, P., Avraham, K.B., Ferrer, I., Arbonés, M.L., Estivill, X. Hum. Mol. Genet. (2001) [Pubmed]
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