A novel mutation at the DFNA36 hearing loss locus reveals a critical function and potential genotype - Phenotype correlation for amino acid-572 of TMC1

S. Kitajiri, T. Makishima, T. B. Friedman, Andrew J. Griffith

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

We ascertained a North American Caucasian family (LMG248) segregating autosomal dominant, non-syndromic, post-lingual, progressive sensorineural hearing loss. The hearing loss begins in the second decade of life and initially affects high frequencies. It progresses to profound deafness at all frequencies by the fourth or fifth decade. The phenotype co-segregates with short-tandem repeat markers flanking the TMC1 gene at the DFNA36 locus on chromosome 9q31-q21. The affected individuals carry a novel missense substitution, p.D572H (c.G1714C), of the TMC1 gene. This mutation is at the same nucleotide and amino acid position as the only other reported DFNA36 mutation, p.D572N (c.G1714A). Our observations implicate a critical function for amino acid-572 for wild-type TMC1 function or the pathogenesis of DFNA36 hearing loss. The slower progression of hearing loss associated with p.D572H, in comparison with that caused by p.D572N, may reflect a correlation of DFNA36 phenotype with TMC1 genotype.

Original languageEnglish (US)
Pages (from-to)148-152
Number of pages5
JournalClinical Genetics
Volume71
Issue number2
DOIs
StatePublished - Feb 2007

Keywords

  • Deafness
  • Dominant
  • Dominant-negative
  • Gain-of-function
  • Genetic
  • Hearing
  • Hotspot mutation
  • TMC1

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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