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Identification of ATP6V1C2 as a novel candidate gene for distal tubular acidosis. Young onset distal tubular acidosis is a rare genetic disorder that can lead, if untreated, to many complications. Mutations in few genes account for almost half of the cases, whereas the molecular mechanisms accounting for the remaining cases are still unknown. The present study reports the use of whole-exome sequencing to identify new dRTA-causing genes and demonstrates that inactivating mutations in the ATP6V1C2 gene impair renal proton pump function.