Cochleosaccular Dysplasia Associated With a Connexin 26 Mutation in Keratitis–Ichthyosis–Deafness Syndrome

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Abstract

Objective:

The objective of this study was to characterize the temporal bone phenotype associated with a mutation of GJB2 (encoding connexin 26).

Study Design:

The authors conducted correlative clinical, molecular genetic, and postmortem histopathologic analysis.

Methods:

The study subject was a male infant with keratitis–ichthyosis–deafness (KID) syndrome. We performed a nucleotide sequence analysis of GJB2 and a histopathologic analysis of the temporal bones.

Results:

The subject was heterozygous for G45E, a previously reported KID syndrome mutation of GJB2. The primary inner ear abnormality was dysplasia of the cochlear and saccular neuroepithelium.

Conclusions:

GJB2 mutations can cause deafness in KID syndrome, and possibly in other GJB2 mutant phenotypes, by disrupting cochlear differentiation.

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