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Sequence variations of mitochondrial DNA and individual sensitivity to the ototoxic effect of cisplatin

Ulrike Peters1, S Preisler-Adams, Claudia Lanvers-Kaminsky

  • 1Institute for Human Genetics, University of Muenster, Muenster, Germany.

Anticancer Research
|June 25, 2003
PubMed
Abstract

Insights

Mitochondrial DNA (mtDNA) variations, particularly haplogroup J, may predispose individuals to hearing loss from cisplatin chemotherapy. This genetic background influences mitochondrial function and sensitivity to ototoxicity.

Area of Science:

  • Genetics
  • Ophthalmology
  • Pharmacology

Background:

  • Mitochondrial DNA (mtDNA) mutations are linked to hearing loss.
  • Cisplatin chemotherapy can cause ototoxicity (hearing damage).

Purpose of the Study:

  • To investigate the association between mtDNA sequence variations and cisplatin-induced ototoxicity.
  • To determine if specific mtDNA mutations or haplogroups correlate with hearing impairment in patients receiving cisplatin therapy.

Main Methods:

  • Sequencing of mtDNA from patients with and without cisplatin-induced hearing impairment.
  • Restriction analysis to characterize mtDNA haplotypes.

Main Results:

  • No common mtDNA mutations (A7445G, 7472insC, A1555G) were found in patients.
  • Variations in the D-loop region did not correlate with hearing loss.
  • Patients with hearing impairment showed a higher frequency (5/20) of the rare European haplogroup J compared to controls (1/19).

Conclusions:

  • Mitochondrial haplogroup J may be linked to cisplatin-induced hearing impairment.
  • This association suggests a predisposing genetic background for altered mitochondrial biochemical function.
  • Haplogroup J is also associated with Leber's Hereditary Optic Neuropathy, indicating a potential shared genetic susceptibility.

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