Mondo Description A condition caused by autosomal recessive loss-of-function mutation(s) in the CYP24A1 or SLC34A1 gene, encoding mitochondrial 1,25-dihydroxyvitamin D(3) 24-hydroxylase, and sodium-dependent phosphate transport protein 2A, respectively. This condition is characterized by vomiting, polyuria, dehydration, and failure to thrive, accompanied by hypercalcemia, suppressed parathyroid hormone, and nephrocalcinosis.