Deafness, X-Linked 2, also known as nance deafness, is related to deafness, x-linked 1 and nonsyndromic hearing loss. An important gene associated with Deafness, X-Linked 2 is POU3F4 (POU Class 3 Homeobox 4), and among its related pathways/superpathways are Pentose phosphate pathway and PRPP biosynthesis. Affiliated tissues include bone and brain, and related phenotypes are dilatated internal auditory canal and congenital sensorineural hearing impairment