Deafness, Autosomal Dominant 21, also known as dfna21, is related to deafness, autosomal dominant 13 and deafness, autosomal dominant 16. An important gene associated with Deafness, Autosomal Dominant 21 is RIPOR2 (RHO Family Interacting Cell Polarization Regulator 2), and among its related pathways/superpathways is Stabilization and expansion of the E-cadherin adherens junction. Affiliated tissues include brain, and related phenotypes are sensorineural hearing impairment and nervous system