Hypoparathyroidism, Familial Isolated, 2, is also known as hypoparathyroidism, familial isolated 2. An important gene associated with Hypoparathyroidism, Familial Isolated, 2 is GCM2 (Glial Cells Missing Transcription Factor 2). Related phenotypes are decreased circulating parathyroid hormone level and hypocalcemic seizures