See:

Pseudohypoparathyroidism types Ia, Ib, Ic and II; Albright hereditary osteodystrophy of (AHO); Pseudopseudohiporatiroidismo (Pseudohypoparathyroidism -PHP- types Ia, Ib, Ic and II, Albright hereditary osteodystrophy -AHO; Pseudopseudohypoparathyroidism -PPHP-) - Gen GNAS.