Mutational spectrum and clinical features of patients with LOXHD1 variants identified in an 8074 hearing loss patient cohort

Karuna Maekawa, Shin Ya Nishio, Satoko Abe, Shin Ichi Goto, Yohei Honkura, Satoshi Iwasaki, Yukihiko Kanda, Yumiko Kobayashi, Shin Ichiro Oka, Mayuri Okami, Chie Oshikawa, Naoko Sakuma, Hajime Sano, Masayuki Shirakura, Natsumi Uehara, Shin Ichi Usami

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Variants of the LOXHD1 gene, which are expressed in hair cells of the cochlea and vestibule, have been reported to cause a progressive form of autosomal recessive non-syndromic hereditary hearing loss, DFNB77. In this study, genetic screening was conducted on 8074 Japanese hearing loss patients utilizing massively parallel DNA sequencing to identify individuals with LOXHD1 variants and to assess their phenotypes. A total of 28 affected individuals and 21 LOXHD1 variants were identified, among which 13 were novel variants. A recurrent variant c.4212 + 1G > A, only reported in Japanese patients, was detected in 18 individuals. Haplotype analysis implied that this variation occurred in a mutational hot spot, and that multiple ancestors of Japanese population had this variation. Patients with LOXHD1 variations mostly showed early onset hearing loss and presented different progression rates. We speculated that the varying severities and progression rates of hearing loss are the result of environmental and/or other genetic factors. No accompanying symptoms, including vestibular dysfunction, with hearing loss were detected in this study. Few studies have reported the clinical features of LOXHD1-gene associated hearing loss, and this study is by far the largest study focused on the evaluation of this gene.

Original languageEnglish
Article number735
Issue number10
Publication statusPublished - 2019 Oct


  • Cochlear implantation
  • DFNB77
  • Haplotype analysis
  • LOXHD1
  • Non-syndromic hearing loss
  • Recurrent variation

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)


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