NCIt definition : A rare, autosomal recessive syndrome caused by mutations in the DHCR7 gene. It is
characterized by deficiency of the enzyme 3 beta-hydroxysterol-delta 7-reductase resulting
in defects in the cholesterol synthesis. It is manifested with multiple congenital
malformations, including facial abnormalities, microcephaly, and syndactyly. Behavioral
abnormalities may also be present.;
Alternative definition : NICHD: An autosomal recessive syndrome caused by mutations in the DHCR7 gene, encoding
7-dehydrocholesterol reductase, the enzyme responsible for the first step of cholesterol
synthesis. The enzyme deficiency results in reduced production of steroid hormones
and underdevelopment of male genitalia due to androgen deficiency. This condition
may also be associated with microcephaly, developmental delay, characteristic facial
anomalies, and syndactyly.;