• Scheibe dysplasia;
  • cochleosaccular dysplasia;
  • connexin 26;
  • GJB2;
  • hearing;
  • KID syndrome


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.