Novel mutation in the Delta-sterol reductase gene in three Lebanese sibs with Smith-Lemli-Opitz (RSH) syndrome.
The Smith-Lemli-Opitz syndrome (SLOS), or RSH syndrome, is a well-characterized multiple congenital anomalies/mental retardation syndrome. The phenotype has been redefined to include mildly affected individuals with minor anomalies and developmental delay, and severe malformations with pre- and perinatal mortality. The condition is due to the deficient activity of the enzyme 7-dehydrocholesterol (7-DHC) reductase [Shefer et al., 1995: J Clin Invest 96:1779-1785], and the gene has been mapped to chromosome 11q13 [Moebius et al., 1998: Proc Natl Acad Sci USA 95:1899-1902]. We describe here a consanguineous family of Syrian-Lebanese ancestry with three sibs affected with SLOS: two with a mild variant, while the other had severe disease and died in the first year of life. Mutation analysis demonstrated a novel mutation in the DHCR7 gene, present in homozygous form in the two affected individuals available for testing, and heterozygous in the parents. The wide intrafamilial variation of clinical severity in these three sibs is an important finding in SLOS.
Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, Toronto, ON, Canada. marjan.nezarati@sickkids.ca
Marjan M
MM
Nezarati
Judith
J
Loeffler
Grace
G
Yoon
Linda
L
MacLaren
Ernest
E
Fung
Floyd
F
Snyder
Gerd
G
Utermann
Gail E
GE
Graham
D002170:Canada; D002648:Child; D002675:Child, Preschool; D003241:Consanguinity; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004252:DNA Mutational Analysis; D005192:Family Health; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D007223:Infant; D007861:Lebanon / Q000208:ethnology; D008297:Male; D009154:Mutation; D020125:Mutation, Missense; D009679:Nuclear Family; D010088:Oxidoreductases / Q000235:genetics*; D044925:Oxidoreductases Acting on CH-CH Group Donors; D010375:Pedigree; D019082:Smith-Lemli-Opitz Syndrome / Q000235:genetics* / Q000473:pathology
D004247:DNA; D010088:Oxidoreductases; D044925:Oxidoreductases Acting on CH-CH Group Donors; C019995:7-dehydrocholesterol reductase