Hypoparathyroidism, Familial Isolated, 1, also known as hypoparathyroidism, familial isolated 1, is related to hypoparathyroidism, familial isolated, 2 and glioma susceptibility 1. An important gene associated with Hypoparathyroidism, Familial Isolated, 1 is PTH (Parathyroid Hormone). Affiliated tissues include eye and thymus.