Congenital anomalies of the kidneys and urinary tract (CAKUT) remain the main cause of chronic kidney disease before the age of 25 years, and account for about 40% of childhood end-stage renal diseases. Studies in Xenopus species have shown ENPP6 knockdown to lead to impaired pronephros development, and mutations in the ENPP6 paralogue PIGN gene have been tied to CAKUT.