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Pseudohypoparathyroidism type 1C

Other Names for this Disease
  • PHP1C
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Pseudohypoparathyroidism type 1C is a genetic disorder that resembles hypoparathyroidism (lowered levels of parathyroid hormone), but is caused by a lack of response to parathyroid hormone rather than having too little of the hormone itself. This condition is very similar to hypoparathyroidism, with low calcium levels and high phosphate levels in the blood.[1] This condition is also associated with short stature, a round face, and short hand bones, which is referred to as Albright's hereditary osteodystrophy. It is distinguished from pseudohypoparathyroidism type 1A because those with type 1C do not have a defect in activity of a particular protein. It is inherited in an autosomal dominant fashion and is caused by a specific mutation in the GNAS gene.[1][2]
Last updated: 10/7/2011


  1. Topiwala S. Pseudohypoparathyroidism. MedlinePlus. July 2012; Accessed 10/17/2012.
  2. Pseudohypoparathyroidism type 1C. Online Mendelian Inheritance of Man (OMIM). March 2010; Accessed 10/7/2011.
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Basic Information

  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The National Organization for Rare Disorders (NORD) is a federation of more than 130 nonprofit voluntary health organizations serving people with rare disorders. Click on the link to view information on this topic.

In Depth Information

  • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Pseudohypoparathyroidism type 1C. Click on the link to view a sample search on this topic.