Deafness, Autosomal Recessive 18a, also known as deafness, autosomal recessive 18, is related to usher syndrome, type ic and nonsyndromic hearing loss. An important gene associated with Deafness, Autosomal Recessive 18a is USH1C (USH1 Protein Network Component Harmonin), and among its related pathways/superpathways are Olfactory Signaling Pathway and Ciliary landscape. Affiliated tissues include brain and retina, and related phenotypes are nervous system and hearing/vestibular/ear