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lüll Abnormal cholesterol biosynthesis in the Smith-Lemli-Opitz syndrome Salen G; Shefer S; Batta AK; Tint GS; Xu G; Honda A; Irons M; Elias ERJ Lipid Res 1996[Jun]; 37 (6): 1169-80The Smith-Lemli-Opitz syndrome is caused by an inherited defect in 7-dehydrocholesterol-delta7-reductase, the enzyme that catalyzes the last reaction in cholesterol biosynthesis, the conversion of 7-dehydrocholesterol to cholesterol. As a result, deficient cholesterol is produced and the precursor 7-dehydrocholesterol and derivatives (8-dehydrocholesterol and 19-nor-5,7,9(10)-cholestatrien-3 beta-ol) accumulate. Tissues (especially brain) deprived of cholesterol, or because of the deposited sterol precursors and derivatives, develop abnormally and function poorly. Replacement with dietary cholesterol may help correct the biochemical defects and improve symptoms.|*Oxidoreductases Acting on CH-CH Group Donors[MESH]|Adolescent[MESH]|Adult[MESH]|Child[MESH]|Child, Preschool[MESH]|Cholesterol/*metabolism[MESH]|Dehydrocholesterols/metabolism[MESH]|Female[MESH]|Fetal Death[MESH]|Heterozygote[MESH]|Humans[MESH]|Incidence[MESH]|Infant[MESH]|Infant, Newborn[MESH]|Oxidoreductases/deficiency/*genetics[MESH]|Smith-Lemli-Opitz Syndrome/epidemiology/genetics/*metabolism[MESH] |