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    This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

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  • Expert Reviews in Molecular Medicine, Volume 11
  • 2009, e35

Connexin-26 mutations in deafness and skin disease

  • Jack R. Lee (a1) and Thomas W. White (a1)
  • DOI: http://dx.doi.org/10.1017/S1462399409001276
  • Published online: 19 November 2009
Abstract

Gap junctions allow the exchange of ions and small molecules between adjacent cells through intercellular channels formed by connexin proteins, which can also form functional hemichannels in nonjunctional membranes. Mutations in connexin genes cause a variety of human diseases. For example, mutations in GJB2, the gene encoding connexin-26 (Cx26), are not only a major cause of nonsyndromic deafness, but also cause syndromic deafness associated with skin disorders such as palmoplantar keratoderma, keratitis–ichthyosis deafness syndrome, Vohwinkel syndrome, hystrix–ichthyosis deafness syndrome and Bart–Pumphrey syndrome. The most common mutation in the Cx26 gene linked to nonsyndromic deafness is 35ΔG, a frameshift mutation leading to an early stop codon. The large number of deaf individuals homozygous for 35ΔG do not develop skin disease. Similarly, there is abundant experimental evidence to suggest that other Cx26 loss-of-function mutations cause deafness, but not skin disease. By contrast, Cx26 mutations that cause both skin diseases and deafness are all single amino acid changes. Since nonsyndromic deafness is predominantly a loss-of-function disorder, it follows that the syndromic mutants must show an alteration, or gain, of function to cause skin disease. Here, we summarise the functional consequences and clinical phenotypes resulting from Cx26 mutations that cause deafness and skin disease.

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Corresponding author
*Corresponding author: Thomas W. White, Department of Physiology and Biophysics, Stony Brook University Medical Center, T5-147, Basic Science Tower, Stony Brook, NY 11794-8661, USA. Tel: +1 631 444 9683; Fax: +1 631 444 3432; E-mail: thwhite@notes.cc.sunysb.edu
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