Connexin mutations in hearing loss, dermatological and neurological disorders

Trends Mol Med. 2002 May;8(5):205-12. doi: 10.1016/s1471-4914(02)02327-4.


Gap junctions are important structures in cell-to-cell communication. Connexins, the protein units of gap junctions, are involved in several human disorders. Mutations in beta-connexin genes cause hearing, dermatological and peripheral nerve disorders. Recessive mutations in the gene encoding connexin 26 (GJB2) are the most common cause of childhood-onset deafness. The combination of mutations in the GJB2 and GJB6 (Cx30) genes also cause childhood hearing impairment. Although both recessive and dominant connexin mutants are functionally impaired, dominant mutations might have in addition a dominant-negative effect on wild-type connexins. Some dominant mutations in beta-connexin genes have a pleiotropic effect at the level of the skin, the auditory system and the peripheral nerves. Understanding the genotype-phenotype correlations in diseases caused by mutations in connexin genes might provide important insight into the mechanisms that lead to these disorders.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Caspase 1
  • Connexin 26
  • Connexins / genetics*
  • Deafness / genetics*
  • Ear, Inner / pathology
  • Gap Junctions
  • Genes, Dominant
  • Genotype
  • Models, Anatomic
  • Mutation*
  • Nervous System Diseases / genetics*
  • Peripheral Nervous System Diseases / genetics
  • Phenotype
  • Skin Diseases / genetics*


  • Connexins
  • GJB2 protein, human
  • connexin 32
  • Connexin 26
  • Caspase 1