Novel Mutations and Mutation Combinations of TMPRSS3 Cause Various Phenotypes in One Chinese Family with Autosomal Recessive Hearing Impairment

Biomed Res Int. 2017:2017:4707315. doi: 10.1155/2017/4707315. Epub 2017 Jan 29.

Abstract

Autosomal recessive hearing impairment with postlingual onset is rare. Exceptions are caused by mutations in the TMPRSS3 gene, which can lead to prelingual (DFNB10) as well as postlingual deafness (DFNB8). TMPRSS3 mutations can be classified as mild or severe, and the phenotype is dependent on the combination of TMPRSS3 mutations. The combination of two severe mutations leads to profound hearing impairment with a prelingual onset, whereas severe mutations in combination with milder TMPRSS3 mutations lead to a milder phenotype with postlingual onset. We characterized a Chinese family (number FH1523) with not only prelingual but also postlingual hearing impairment. Three mutations in TMPRSS3, one novel mutation c.36delC [p.(Phe13Serfs⁎12)], and two previously reported pathogenic mutations, c.916G>A (p.Ala306Thr) and c.316C>T (p.Arg106Cys), were identified. Compound heterozygous mutations of p.(Phe13Serfs⁎12) and p.Ala306Thr manifest as prelingual, profound hearing impairment in the patient (IV: 1), whereas the combination of p.Arg106Cys and p.Ala306Thr manifests as postlingual, milder hearing impairment in the patient (II: 2, II: 3, II: 5), suggesting that p.Arg106Cys mutation has a milder effect than p.(Phe13Serfs⁎12). We concluded that different combinations of TMPRSS3 mutations led to different hearing impairment phenotypes (DFNB8/DFNB10) in this family.

MeSH terms

  • Aged
  • Amino Acid Sequence
  • Asian People / genetics*
  • Audiometry
  • Base Sequence
  • Child
  • Cochlear Implants
  • Conserved Sequence
  • DNA Mutational Analysis
  • Deafness / genetics
  • Family
  • Female
  • Genes, Recessive*
  • Genetic Predisposition to Disease*
  • Hearing Loss / genetics*
  • High-Throughput Nucleotide Sequencing
  • Humans
  • Male
  • Membrane Proteins / genetics*
  • Middle Aged
  • Models, Molecular
  • Mutant Proteins / chemistry
  • Mutant Proteins / genetics
  • Mutation / genetics*
  • Neoplasm Proteins / genetics*
  • Pedigree
  • Phenotype
  • Serine Endopeptidases / genetics*

Substances

  • Membrane Proteins
  • Mutant Proteins
  • Neoplasm Proteins
  • Serine Endopeptidases
  • TMPRSS3 protein, human