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Genetic and clinical features of sensorineural hearing loss associated with the 1555 mitochondrial mutation

S Usami1, S Abe, M Kasai

  • 1Department of Otorhinolaryngology, Hirosaki University School of Medicine, Japan.

The Laryngoscope
|April 1, 1997
PubMed

Insights

A specific mitochondrial mutation (A1555G) is linked to aminoglycoside-induced hearing loss in Japanese families. This genetic factor may also contribute to hearing loss in individuals without drug exposure.

Area of Science:

  • Genetics
  • Otolaryngology
  • Mitochondrial Biology

Background:

  • Aminoglycoside antibiotics can cause hearing loss.
  • Genetic factors may predispose individuals to hearing loss.

Purpose of the Study:

  • To investigate the genetic and clinical basis of aminoglycoside-induced hearing loss in Japanese families.
  • To identify specific genetic mutations associated with hearing impairment.

Main Methods:

  • Genetic analysis of five Japanese families with aminoglycoside-induced hearing loss.
  • Clinical investigation of affected individuals.
  • Comparison with American control subjects.

Main Results:

  • A mitochondrial mutation at nucleotide 1555 (A1555G) was identified in 28 out of 32 subjects.
  • The A1555G mutation was not found in 100 American control subjects.
  • Many subjects with the A1555G mutation exhibited progressive hearing loss even without aminoglycoside exposure.

Conclusions:

  • The A1555G mitochondrial mutation is prevalent in Japanese families with aminoglycoside-induced hearing loss.
  • This mutation may be more common in Asian populations.
  • The A1555G mutation is a potential risk factor for hearing loss, independent of aminoglycoside use.

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