Screening of the general Polish population for deafness-associated mutations in mitochondrial 12S rRNA and tRNA Ser(UCN) genes

Genet Test Mol Biomarkers. 2009 Apr;13(2):167-72. doi: 10.1089/gtmb.2008.0098.

Abstract

Mutations in mitochondrial DNA are associated potentially with nonsyndromic and aminoglycoside-induced hearing loss. Several nucleotide changes associated with hearing impairment were described; however, a variable frequency of deafness-associated mutations in different populations has been observed. The aim of the present study was to determine the frequency of pathological mutations in mitochondrial 12S rRNA and tRNA(Ser(UCN)) genes in a group of 500 individuals representative of the general population of Poland. Mutational screening of 12S rRNA revealed the presence of three deafness-associated mutations, A827G, T961C, and A1555G, and one potentially pathogenic substitution, T669C. The carrier frequency of pathological mutations was estimated to be 1.2% (6/500) in the general Polish population. A deafness-associated G7444A mutation in the precursor of tRNA(Ser(UCN)) gene was identified in 8/500 (1.6%) unrelated blood donors. Seven nucleotide changes identified in 12S rRNA (G709A, G750A, G930A, T1243C, T1420C, and G1438A) and tRNA(Ser(UCN)) (C7476T), based on a frequency exceeding 1.0%, were considered as polymorphisms of 12S rRNA and tRNA(Ser(UCN)) in the studied population. Mitochondrial 12S rRNA gene seems to be the hot spot for deafness-associated mutations in the Polish population. The relatively high carrier frequency of tRNA(Ser(UCN)) G7444A (1/62) suggests that this substitution might be a nonpathogenic polymorphism in the Polish population.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Base Sequence
  • Child
  • Child, Preschool
  • Cohort Studies
  • DNA Mutational Analysis
  • DNA, Mitochondrial / genetics
  • Deafness / genetics*
  • European Continental Ancestry Group / genetics
  • Female
  • Gene Deletion
  • Genetic Testing / methods*
  • Geography
  • Heterozygote
  • Humans
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Mutation*
  • Poland
  • Polymorphism, Genetic
  • Polymorphism, Single-Stranded Conformational
  • Population Groups / genetics*
  • RNA, Ribosomal / genetics*
  • RNA, Transfer, Amino Acyl / genetics*
  • Sequence Analysis, RNA
  • Young Adult

Substances

  • DNA, Mitochondrial
  • RNA, Ribosomal
  • RNA, Transfer, Amino Acyl
  • RNA, ribosomal, 12S