Pseudohypoparathyroidism causes: Difference between revisions

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==Overview==
==Overview==
Pseudohypoparathyroidism is caused by [[mutations]] involving primarily the [[GNAS1|GNAS]] gene that results in end organ resistance to [[parathyroid hormone]].


==Causes==
==Causes==
The parathyroid glands help control calcium use and removal by the body. They do this by producing parathyroid hormone, or PTH. PTH helps control calcium, phosphorus, and vitamin D levels within the blood and bone.
* Pseudohypoparathyroidism is caused by [[mutations]] that result in end-organ resistance to [[parathyroid hormone]] like:<ref name="pmid25219572">{{cite journal |vauthors=Lemos MC, Thakker RV |title=GNAS mutations in Pseudohypoparathyroidism type 1a and related disorders |journal=Hum. Mutat. |volume=36 |issue=1 |pages=11–9 |year=2015 |pmid=25219572 |pmc=4309471 |doi=10.1002/humu.22696 |url=}}</ref>
 
**[[Heterozygous]] GNAS inactivating [[mutations]] that reduce expression or function of Gαs
Persons with pseudohypoparathyroidism produce the right amount of PTH, but the body is "resistant" to its effect. This causes low blood calcium levels and high blood phosphate levels.
**Familial-[[heterozygous]] deletions in STX16, NESP55, and/or AS [[exons]] or loss of [[methylation]] at [[GNAS1|GNAS]]
 
**Sporadic-paternal [[uniparental disomy]] of [[chromosome]] 20q in some or [[methylation]] defect affecting all four [[GNAS1|GNAS]] genes
Pseudohypoparathyroidism is caused by abnormal genes. All forms of pseudohypoparathyroidism are very rare.
**Combination of inactivating [[mutations]] of [[GNAS1]] and [[Albright's hereditary osteodystrophy|Albright's osteodystrophy]]
 
* For a complete review of genes involved in pseudohypoparathyroidism and associated [[parathyroid hormone|parathyroid hormone,]] resistance [[Pseudohypoparathyroidism pathophysiology#Genetics|click here]]
Type Ia is inherited in an autosomal dominant manner. That means only one parent needs to pass you the defective gene in order for you to develop the condition. The condition causes short stature, round face, and short hand bones, and is also called Albright's hereditary osteodystrophy.
 
Type Ib involves resistance to PTH only in the kidneys. Type Ib is less understood than type Ia. Type II is very similar to type I in its clinical features, but the events that take place in the kidneys are different.
 
Type II pseudohypoparathyroidism also involves low blood calcium and high blood phosphate levels, but persons with this form do not develop the physical characteristics seen in those with Type Ia.
 
All forms of pseudohypoparathyroidism are very rare.


==References==
==References==
{{Reflist|2}}
{{Reflist|2}}


[[Category:Needs content]]
[[Category:Disease]]
[[Category:Disease]]
[[Category:Endocrinology]]
[[Category:Endocrinology]]

Latest revision as of 13:06, 26 October 2017

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Mazia Fatima, MBBS [2]


Overview

Pseudohypoparathyroidism is caused by mutations involving primarily the GNAS gene that results in end organ resistance to parathyroid hormone.

Causes

References

  1. Lemos MC, Thakker RV (2015). "GNAS mutations in Pseudohypoparathyroidism type 1a and related disorders". Hum. Mutat. 36 (1): 11–9. doi:10.1002/humu.22696. PMC 4309471. PMID 25219572.


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