DO_rare_slim pseudohypoparathyroidism type 1B A pseudohypoparathyroidism characterized by isolated renal parathyroid hormone (PTH) resistance resulting in hypocalcemia, hyperphosphatemia and elevated PTH levels that has_material_basis_in mutations that alter the methylation pattern of GNAS on 20q13.32. Mutations in GNAS, GNAS-AS1, and STX16 have been shown to alter the methylation pattern of GNAS. disease_ontology ORDO:94089 MIM:603233 DOID:0080222 GARD:10680 MeSH obsoleted this term and ID, merged with parent term.[LS] PHP Ib pseudohypoparathyroidism