Interestingly, one patient with mutation in SLC3A3 gene coding for phosphate channel NapiIIc had normal phosphate levels at presentation which probably can be explained by effective activation of compensatory mechanism of FGF23 suppression due to phosphaturia, leading to increased 1,25-(OH)2D levels and absorptive hypercalciuria. The gene discussed is FGF23; the disease is Hypercalciuria.