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Next-Generation Sequencing Reveals a Novel Pathological Mutation in the Tmc1 Gene Causing Autosomal Recessive Non-Syndromic Hearing Loss in an Iranian Kindred Publisher Pubmed



Sadeghian L1 ; Tabatabaiefar MA2, 3 ; Fattahi N4 ; Pourreza MR2 ; Tahmasebi P5 ; Alavi Z6 ; Hashemzadeh Chaleshtori M1
Authors
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Authors Affiliations
  1. 1. Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
  2. 2. Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
  4. 4. Cilinical Biochemistry Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
  5. 5. Department of Biology, Faculty of Sciences, Ilam University, Ilam, Iran
  6. 6. Department of Genetics, Islamic Azad University, Shahrekord Branch, Shahrekord, Iran

Source: International Journal of Pediatric Otorhinolaryngology Published:2019


Abstract

Objectives: Hearing loss (HL) is the most common sensory-neural disorder with excessive clinical and genetic heterogeneity, which negatively affects life quality. Autosomal recessive non-syndromic hearing loss (ARNSHL) is the most common form of the disease with no specific genotype-phenotype correlation in most of the cases. Whole exome sequencing (WES) is a powerful tool to overcome the problem of finding mutations in heterogeneous disorders. Methods: A comprehensive clinical and pedigree examination was performed on a multiplex family from Khuzestan province suffering from hereditary HL. Direct sequencing of GJB2 and genetic linkage analysis of DFNB1A/B was accomplished. WES was utilized to find possible genetic etiology of the disease. Co-segregation analysis of the candidate variant was done. High resolution melting analysis was applied to detect variant status in 50 healthy matched controls. Results: Clinical investigations suggested ARNSHL in the pedigree. The family was negative for DFNB1A/B. WES revealed a novel nonsense mutation, c.256G > T (p.Glu86*), in TMC1 segregating with the phenotype in the pedigree. The variant was absent in the controls. Conclusion: Here, we report successful application of WES to identify the molecular pathogenesis of ARNSHL in a large family. The novel nonsense TMC1 variant meets the criteria of being pathogenic according to the ACMG-AMP variant interpretation guideline. © 2019
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