objectives: hearing loss (hl) is the most common sensory disorder, and affects 1 in 1000 newborns. about 50% of hl is due to genetics and 70% of them are non-syndromic with a recessive pattern of inheritance. up to now, more than 50 genes have been detected which are responsible for autosomal recessive non-syndromic hearing loss, (arnshl). in iran, hl is one of the most common disabilities due...