Deafness, Autosomal Recessive 100, also known as dfnb100, is related to usher syndrome, type iid and deafness, autosomal recessive 23. An important gene associated with Deafness, Autosomal Recessive 100 is PPIP5K2 (Diphosphoinositol Pentakisphosphate Kinase 2). Affiliated tissues include brain, and related phenotypes are sensorineural hearing impairment and abnormal vestibular function