Deafness, Autosomal Dominant 23, also known as dfna23, is related to contractures, pterygia, and spondylocarpotarsal fusion syndrome 1a and branchiootorenal spectrum disorder. An important gene associated with Deafness, Autosomal Dominant 23 is SIX1 (SIX Homeobox 1). Affiliated tissues include kidney, and related phenotypes are conductive hearing impairment and preauricular pit