TRPM6 and Hypocalcemia: The other 4 diseases have autosomal recessive inheritance: APRT deficiency, SRTD 9 with or without polydactyly due to IFT140 mutations, hypercalcemia infantile type1 with altered calcium metabolism due to CYP24A1 mutations, and hypomagnesemia 1 intestinal or hypomagnesemia with secondary hypocalcemia due to TRPM6 mutations.