What causes Congenital adrenal hyperplasia ?
What causes congenital adrenal hyperplasia? Congenital adrenal hyperplasia (CAH) is a group of genetic conditions that can be caused by a change (mutation) in several different genes: 21-hydroxylase deficiency is caused by mutations in the CYP21A2 gene 3-beta-hydroxysteroid dehydrogenase deficiency is caused by mutations in the HSD3B2 gene 11-beta-hydroxylase deficiency is caused by mutations in the CYP11B1 gene Cytochrome P450 oxidoreductase deficiency is caused by mutations in the POR gene 17-hydroxylase deficiency is caused by mutations in the CYP17A1 gene Congenital lipoid adrenal hyperplasia is caused by mutations in the STAR gene Most of these genes encode enzymes that the adrenal glands need to make one or more hormones. The adrenal glands are cone-shaped organs that sit on top of the kidneys and are responsible for releasing various types of hormones that the body needs to function. Mutations in these genes lead to deficient levels of enzymes which cause low levels of hormones such as cortisol and/or aldosterone and an overproduction of androgens (male hormones such as testosterone). Cortisol is a hormone that affects energy levels, blood sugar levels, blood pressure, and the body's response to stress, illness, and injury. Aldosterone helps the body maintain the proper level of sodium (salt) and water and helps maintain blood pressure. Irregular levels of these hormones lead to the signs and symptoms of CAH.