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Hypophosphatemic rickets due to mutation(s) in the X-chromosomal CLCN5 gene, encoding H(+)/Cl(-) exchange transporter 5. This condition is expressed in male individuals hemizygous for the mutation(s), and in female individuals homozygous for the mutation(s). The disorder of the proximal renal tubules is characterized by low-molecular weight proteinuria, hypercalciuria, renal phosphate wasting, nephrocalcinosis, nephrolithiasis, progressive kidney failure, and elevated 1,25-dihydroxyvitamin D (calcitriol) concentrations.
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