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1: Am J Med Genet. 2001 Sep 15;103(1):75-80.Click here to read Links

Smith-Lemli-Opitz (RHS) syndrome: holoprosencephaly and homozygous IVS8-1G-->C genotype.

Nowaczyk MJ, Farrell SA, Sirkin WL, Velsher L, Krakowiak PA, Waye JS, Porter FD.

Department of Pathology and Molecular Medicine, McMaster University, Canada. nowaczyk@hhsc.ca

Smith-Lemli-Opitz syndrome (RHS) (SLOS, OMIM 270400) is an autosomal recessive disorder of cholesterol biosynthesis caused by mutations of the 3beta-hydroxysterol Delta(7)-Delta(8)-reductase gene, DHCR7. We report a fetus with holoprosencephaly and multiple congenital anomalies who was homozygous for the IVS8-1G-->C mutation. Following termination of pregnancy, both the elevated amniotic fluid 7-dehydrocholesterol level and the DHCR7 mutations were demonstrated. Two other newborn infants with IVS8-1G-->C/IVS8-1G-->C genotype are described. This report illustrates a severe phenotypic extreme of SLOS associated with a null genotype, underscores the complex relationship between SLOS and holoprosencephaly, and discusses the possible pathogenetic mechanisms of the development of holoprosencephaly in SLOS.

PMID: 11562938 [PubMed - indexed for MEDLINE]