Alternative definition : NICHD: An autosomal recessive form of hypophosphatemic rickets caused by inactivating
mutation(s) in the SLC34A3 gene, encoding sodium-dependent phosphate transport protein
2C, a protein involved in maintenance of inorganic phosphate concentration in the
kidney. The condition is characterized by elevated 1,25-dihydroxyvitamin D (calcitriol)
concentrations, resulting in increased intestinal calcium absorption and hypercalciuria.
This form of hypophosphatemic rickets is also distinguished by the lack of elevated
fibroblast growth factor 23 (FGF23) concentrations.;