Mutations in the Myosin VIIA Gene Cause Non-Syndromic Recessive Deafness

Nat Genet. 1997 Jun;16(2):188-90. doi: 10.1038/ng0697-188.

Abstract

Genetic hearing impairment affects around 1 in every 2,000 births. The bulk (approximately 70%) of genetic deafness is non-syndromic, in which hearing impairment is not associated with any other abnormalities. Over 25 loci involved in non-syndromic deafness have been mapped and mutations in connexin 26 have been identified as a cause of non-sydromic deafness. One locus for non-syndromic recessive deafness, DFNB2 (ref. 4), has been localized to the same chromosomal region, 11q14, as one of the loci, USH1B, underlying the recessive deaf-blind syndrome. Usher syndrome type 1b, which is characterized by profound congenital sensorineural deafness, constant vestibular dysfunction and prepubertal onset of retinitis pigmentosa. Recently, it has been shown that a gene encoding an unconventional myosin, myosin VIIA, underlies the mouse recessive deafness mutation, shaker-1 (ref. 5) as well as Usher syndrome type 1b. Mice with shaker-1 demonstrate typical neuroepithelial defects manifested by hearing loss and vestibular dysfunction but no retinal pathology. Differences in retinal patterns of expression may account for the variance in phenotype between shaker-1 mice and Usher type 1 syndrome. Nevertheless, the expression of MYO7A in the neuroepithelium suggests that it should be considered a candidate for non-syndromic deafness in the human population. By screening families with non-syndromic deafness from China, we have identified two families carrying MYO7A mutations.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Animals
  • Chromosomes, Human, Pair 11
  • Deafness / genetics*
  • Dyneins
  • Exons
  • Genes, Recessive*
  • Heterozygote
  • Humans
  • Mice
  • Middle Aged
  • Mutation*
  • Myosin VIIa
  • Myosins / genetics*
  • Pedigree
  • RNA Splicing

Substances

  • MYO7A protein, human
  • Myo7a protein, mouse
  • Myosin VIIa
  • Myosins
  • Dyneins