Molecular genetics of 21-hydroxylase deficiency.

Abstract excerpt

More than 95% of all cases of congenital adrenal hyperplasia are caused by deficiency of steroid 21-hydroxylase, an enzyme encoded by the CYP21A2 gene. The severity of the clinical symptoms varies according to the level of residual 21-hydroxylase activity. The CYP21A2 gene is located in the HLA class III region, as a component of so called RCCX modules containing homologous genes repeated in tandem. Misalignment...

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