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We try to explain why hypercalciuria is absent at diagnosis in some children with an ATP6V1B1 mutation. A 5-month-old girl presented with distal renal tubular acidosis (dRTA) and sensorineural hearing loss. Direct sequencing of the ATP6V1B1 genes disclosed a new homozygous mutation (452 delT) in exon 13. In particular, an absence of hypercalciuria and a normal level of parathyroid hormones were noted...
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