- The R245X mutation of PCDH15 in Ashkenazi Jewish children diagnosed with nonsyndromic hearing loss foreshadows retinitis pigmentosa. Brownstein, Z., Ben-Yosef, T., Dagan, O., Frydman, M., Abeliovich, D., Sagi, M., Abraham, F.A., Taitelbaum-Swead, R., Shohat, M., Hildesheimer, M., Friedman, T.B., Avraham, K.B. Pediatr. Res. (2004)