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Hearing loss in mitochondrial disorders.

Chang-Hung Hsu1, Haeyoung Kwon, Cherng-Lih Perng

  • 1Institute for Molecular and Human Genetics, Georgetown University Medical Center, 3800 Reservoir Rd., NW, Washington, DC 20007, USA.

Annals of the New York Academy of Sciences
|June 21, 2005
PubMed
Summary

Mitochondrial DNA (mtDNA) alterations are linked to syndromic hearing loss. This study identified novel mutations and confirmed that mtDNA defects significantly impact mitochondrial gene expression in affected individuals.

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Area of Science:

  • Genetics
  • Neurology
  • Otolaryngology

Background:

  • Hearing loss is a frequent symptom in mitochondrial syndrome disorders.
  • The precise molecular causes of this hearing loss remain incompletely understood.

Purpose of the Study:

  • To investigate the molecular basis of hearing loss in patients with mitochondrial diseases.
  • To identify genetic alterations in mitochondrial DNA (mtDNA) associated with syndromic hearing loss.

Main Methods:

  • Clinical evaluation of 83 patients with suspected mitochondrial syndromic hearing loss.
  • Molecular analysis of blood and tissue samples to detect mtDNA mutations, deletions, and content abnormalities.
  • Classification of patients using modified Walker's criteria for mitochondrial disease diagnosis.

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Main Results:

  • Deleterious mtDNA point mutations, abnormal mtDNA content, or multiple deletions were found in 22 patients (20 definite, 2 probable diagnoses).
  • Several novel, clinically significant mutations were identified alongside known pathogenic mutations.
  • Patients with mtDNA alterations showed higher frequencies of cardiomyopathy, lactic acidosis, respiratory chain deficiencies, and abnormal brain imaging.

Conclusions:

  • Mitochondrial DNA defects are a significant cause of syndromic hearing loss.
  • These defects frequently impact overall mitochondrial gene expression.
  • Identifying specific mtDNA alterations is crucial for understanding and potentially treating mitochondrial syndromic hearing loss.