Partial Defect in the Cholesterol Side-Chain Cleavage Enzyme P450scc (CYP11A1) Resembling Nonclassic Congenital Lipoid Adrenal Hyperplasia

摘要

Context:The cholesterol side-chain cleavage enzyme (P450scc), encoded by the CYP11A1 gene, converts cholesterol to pregnenolone to initiate steroidogenesis. Genetic defects in P450scc cause a rare autosomal recessive disorder that is clinically indistinguishable from congenital lipoid adrenal hyperplasia (lipoid CAH). Nonclassic lipoid CAH is a recently recognized disorder caused by mutations in the steroidogenic acute regulatory protein (StAR) that retain partial function.