Tehran University of Medical Sciences Iranian Journal of Public Health 2251-6085 48 9 2019 09 03 1704 1713 Mahbobeh KOOHIYAN Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran Somayeh REIISI Department of Genetics, Faculty of Basic Sciences, University of Shahrekord, Shahrekord, Iran Fatemeh AZADEGAN-DEHKORDI Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran Mansoor SALEHI Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran Hamidreza ABTAHI Department of Otolaryngology, Al-Zahra Hospital, Isfahan University of Medical Sciences, Isfahan, Iran Morteza HASHEMZADEH-CHALESHTORI Cellular and Molecular Research Center, Basic Health Sciences Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran Mohammad Reza NOORI-DALOII Department of Medical Genetics, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran Mohammad Amin TABATABAIEFAR Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran AND Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Diseases, Isfahan University of Medical Sciences, Isfahan, Iran 2019 09 03 Background: Autosomal recessive non-syndromic hearing loss (ARNSHL), one of the global public health concerns, is marked by a high degree of genetic heterogeneity. The role of GJB2, as the most common cause of ARNSHL, is only <20% in the Iranian population. Here, we aimed to determine the relative contribution of several apparently most common loci in a cohort of ARNSHL Iranian families that were negative for the GJB2 mutations. Methods: Totally, 80 Iranian ARNSHL families with 3 or more affected individuals from Isfahan and Hamedan provinces, Iran were enrolled in 2017. After excluding mutations in the GJB2 gene via Sanger sequencing, 60 negative samples (30 families from each province) were analyzed using homozygosity mapping for 10 ARNSHL loci. Results: Fourteen families were found to be linked to five different known loci, including DFNB4 (5 families), DFNB2 (3 families), DFNB7/11 (1 family), DFNB9 (2 families) and DFNB3 (3 families). Conclusion: Despite the high heterogeneity of ARNSHL, the genetic causes were determined in 23.5% of the studied families using homozygosity mapping. This data gives an overview of the ARNSHL etiology in the center and west of Iran, used to establish a diagnostic gene panel including most common loci for hearing loss diagnostics.   https://ijph.tums.ac.ir/index.php/ijph/article/view/18260 https://ijph.tums.ac.ir/index.php/ijph/article/download/18260/6510