Question: What causes Non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency ?
Answer: What causes non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency? Non-classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency (NCAH) is caused by changes (mutations) in the CYP21A2 gene. This gene provides instructions for making an enzyme called 21-hydroxylase, which is found in the adrenal glands. 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 CYP21A2 lead to deficient levels of 21-hydroxylase 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 NCAH. The amount of functional 21-hydroxylase enzyme determines the severity of the disorder. People with NCAH have CYP21A2 mutations that result in the production of reduced amounts of the enzyme, but more enzyme than the classic form of congenital adrenal hyperplasia.
Source: GARD