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http://dx.doi.org/10.5352/JLS.2021.31.5.453

Identification of Homozygous Mutations in Two Consanguineous Families with Hearing Loss  

Lim, Si On (Department of Biological Sciences, Kongju National University)
Park, Hye Ri (Department of Biological Sciences, Kongju National University)
Jung, Na Young (Department of Biological Sciences, Kongju National University)
Park, Cho Eun (Department of Biological Sciences, Kongju National University)
Kanwal, Sumaira (Department of Biosciences, COMSATS University Islamabad)
Chung, Ki Wha (Department of Biological Sciences, Kongju National University)
Publication Information
Journal of Life Science / v.31, no.5, 2021 , pp. 453-463 More about this Journal
Abstract
Hearing loss is a group of clinically and genetically heterogeneous disorders characterized by congenital- to adult-onset deafness with frequent additional symptoms such as myopathy, nephropathy, and optic disorders. It is commonly divided into two types: syndromic, with no other symptoms, and nonsyndromic, with other symptoms. Autosomal recessive hearing loss is relatively frequent in Pakistan, which may be due in part to frequent consanguineous marriages. This study was performed by whole exome sequencing to determine the genetic causes in two Pakistani consanguineous families with autosomal recessive hearing loss. We identified a pathogenic homozygous variant (p.Leu326Gln in MYO7A) in a family with prelingual-onset hearing loss and two variants of uncertain significance (p.Val3094Ile in GPR98 and p.Asp56Gly in PLA2G6) in a family with early-onset hearing loss concurrent with muscular atrophy. The missense mutations in MYO7A and PLA2G6 were located in the highly conserved sites, and in silico analyses predicted pathogenicity, while the GPR98 mutation was located in the less conserved site, and most in silico analysis programs predicted its nonpathogenic effect. Homozygosity mapping showed that both alleles of the homozygous mutations identified in each family originated from a single founder; spread from this single source might be due to consanguineous marriages. This study will help provide exact molecular diagnosis and treatment for autosomal recessive hearing loss patients in Pakistan.
Keywords
Autosomal recessive hearing loss; consanguinity; molecular diagnosis; MYO7A; Pakistan;
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