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A comprehensive study to determine heterogeneity of autosomal recessive nonsyndromic hearing loss in Iran
Journal article   Peer reviewed

A comprehensive study to determine heterogeneity of autosomal recessive nonsyndromic hearing loss in Iran

Mojgan Babanejad, Zohreh Fattahi, Niloofar Bazazzadegan, Carla Nishimura, Nicole Meyer, Nooshin Nikzat, Elahe Sohrabi, Amin Najmabadi, Peyman Jamali, Farkhonde Habibi, …
American journal of medical genetics. Part A, Vol.158A(10), pp.2485-2492
10/2012
DOI: 10.1002/ajmg.a.35572
PMID: 22903915

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Abstract

Hearing loss is the most common sensory disorder worldwide and affects 1 of every 500 newborns. In developed countries, at least 50% of cases are genetic, most often resulting in nonsyndromic deafness (70%), which is usually autosomal recessive (∼80%). Although the cause of hearing loss is heterogeneous, mutations in GJB2 gene at DFNB1 locus are the major cause of autosomal recessive nonsyndromic hearing loss (ARNSHL) in many populations. Our previous study showed that mutations of GJB2 gene do not contribute to the major genetic load of deafness in the Iranian population (∼16%). Therefore, to define the importance of other genes in contributing to an ARNSHL phenotype in the Iranian population, we used homozygosity mapping to identify regions of autozygosity-by-descent in 144 families which two or more progeny had ARNSHL but were negative for GJB2 gene mutations. Using flanking or intragenic short-tandem repeat markers for 33 loci we identified 33 different homozygous variations in 10 genes, of which 9 are novel. In aggregate, these data explain ∼40% of genetic background of ARNHSL in the Iranian population.
 Homozygote Humans Family Chromosome Mapping Connexins Hearing Loss, Sensorineural - epidemiology Hearing Loss, Sensorineural - genetics Mutation Iran - epidemiology Genes, Recessive Microsatellite Repeats - genetics

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