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Mitochondrial mutation associated with nonsyndromic deafness

N Fischel-Ghodsian1, T R Prezant, P Fournier

  • 1Ahmanson Department of Pediatrics, Steven Spielberg Pediatric Research Center, Cedars-Sinai Research Institute, Los Angeles, CA, USA.

American Journal of Otolaryngology
|November 1, 1995
PubMed
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A newly identified mitochondrial gene mutation, 7445 A-->G in the tRNA(Ser)(UCN)/COI gene, is the likely cause of maternally inherited nonsyndromic deafness in two unrelated families. This finding suggests that mutations affecting cellular energy production can lead to hearing loss.

Area of Science:

  • Genetics
  • Molecular Biology
  • Otolaryngology

Background:

  • Nonsyndromic deafness, a common form of hearing loss, can have various genetic causes.
  • Mitochondrial DNA mutations are increasingly recognized as contributors to human diseases, including hearing impairment.

Purpose of the Study:

  • To identify the molecular basis of maternally inherited nonsyndromic sensorineural deafness in a New Zealand family.
  • To investigate a potential link between mitochondrial DNA sequence variations and hearing loss.

Main Methods:

  • Pedigree analysis and audiological/clinical data collection.
  • Mitochondrial genome sequencing and analysis of DNA from affected family members.
  • Confirmation of sequence variations using allele-specific oligonucleotide hybridization and restriction enzyme analysis.

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Main Results:

  • A heteroplasmic mutation, nucleotide 7445 A-->G in the mitochondrial tRNA(Ser)(UCN)/COI gene, was identified in the New Zealand family.
  • This mutation was identical to one previously found in a Scottish family with nonsyndromic deafness.

Conclusions:

  • The 7445 A-->G mutation is strongly implicated as the cause of nonsyndromic deafness in both the New Zealand and Scottish families.
  • This suggests that mutations in genes involved in fundamental cellular processes, like oxidative phosphorylation, can cause hearing loss.