has material basis in germline mutation in CDH23 PCDH15 Usher syndrome type 1 Usher syndrome, type 1D/F MONDO:0100050 Usher syndrome, type 1D/F, CDH23/PCDH15, digenic USH1D/F, CDH23/PCDH15, digenic Any Usher syndrome in which the cause of the disease is a mutation in the CDH23 and PCDH15 genes. GARD:0026025