GTR Home > Conditions/Phenotypes > Pseudopseudohypoparathyroidism


Patients with pseudopseudohypoparathyroidism do not show resistance to parathyroid hormone (PTH; 168450) or other hormones, as is the case with PHP1A (103580), but do manifest the constellation of clinical features referred to as Albright hereditary osteodystrophy (AHO), which includes short stature, obesity, round facies, subcutaneous ossifications, brachydactyly, and other skeletal anomalies. Some patients have mental retardation (Kinard et al., 1979; Fitch, 1982; Mantovani and Spada, 2006). PPHP occurs only after paternal inheritance of the molecular defect, whereas PHP1A occurs only after maternal inheritance of the molecular defect (see Inheritance and Pathogenesis below). This is an example of imprinting, with differential gene expression depending on the parent of origin of the allele (Davies and Hughes, 1993; Wilson et al., 1994). For a general phenotypic description, classification, and a discussion of molecular genetics of pseudohypoparathyroidism, see PHP1A (103580). [from OMIM]

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