Novel compound heterozygous mutations in MYO7A Associated with Usher syndrome 1 in a Chinese family

PLoS One. 2014 Jul 31;9(7):e103415. doi: 10.1371/journal.pone.0103415. eCollection 2014.

Abstract

Usher syndrome is an autosomal recessive disease characterized by sensorineural hearing loss, age-dependent retinitis pigmentosa (RP), and occasionally vestibular dysfunction. The most severe form is Usher syndrome type 1 (USH1). Mutations in the MYO7A gene are responsible for USH1 and account for 29-55% of USH1 cases. Here, we characterized a Chinese family (no. 7162) with USH1. Combining the targeted capture of 131 known deafness genes, next-generation sequencing, and bioinformatic analysis, we identified two deleterious compound heterozygous mutations in the MYO7A gene: a reported missense mutation c.73G>A (p.G25R) and a novel nonsense mutation c.462C>A (p.C154X). The two compound variants are absent in 219 ethnicity-matched controls, co-segregates with the USH clinical phenotypes, including hearing loss, vestibular dysfunction, and age-dependent penetrance of progressive RP, in family 7162. Therefore, we concluded that the USH1 in this family was caused by compound heterozygous mutations in MYO7A.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • China
  • Female
  • Heterozygote*
  • Humans
  • Male
  • Middle Aged
  • Molecular Sequence Data
  • Mutation*
  • Myosin VIIa
  • Myosins / chemistry
  • Myosins / genetics*
  • Pedigree
  • Sequence Homology, Amino Acid
  • Usher Syndromes / genetics*

Substances

  • MYO7A protein, human
  • Myosin VIIa
  • Myosins