A Novel Pathologic Variant in OTOF in an Iranian Family Segregating Hereditary Hearing Loss
Abstract
Objective Hearing loss (HL) is the most common sensory-neural defect and the most heterogeneous trait in humans, with the involvement of >100 genes, which make a molecular diagnosis problematic. Next-generation sequencing (NGS) is a new strategy that can overcome this problem. Study Design Descriptive experimental study. Setting Diagnostic laboratory. Subjects and Methods A comprehensive family history was obtained, and clinical evaluations and pedigree analysis were performed in a family with multiple individuals with HL. As the first tier, GJB2 was sequenced, and genetic linkage analysis of DFNB1A/B was performed to rule out the most common cause of the disease. Targeted NGS was used to unravel the molecular etiology of the disease in the HL-associated genes in the proband. Two homozygous variants remained in OTOF after proper filtration. Cosegregation and in silico analysis were done. Preimplantation genetic diagnosis (PGD) was accomplished via linkage analysis and direct sequencing of the pathogenic variant. Results Clinical evaluations suggested autosomal recessive nonsyndromic HL. Two homozygous variants, c.367G>A (p.Gly123Ser) and c.1392+1G>A, were identified in cis status. c.1392+1G>A met the criteria for being pathogen...Continue Reading
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