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Smith-Lemli-Opitz syndrome: evidence of T93M as a common mutation of Δ7-sterol reductase in Italy and report of three novel mutations

1999; Springer Nature; Volume: 7; Issue: 8 Linguagem: Inglês

10.1038/sj.ejhg.5200390

1476-5438

Daniele De Brasi, Teresa Esposito, Massimiliano Rossi, Giancarlo Parenti, MP Sperandeo, A Zuppaldi, Tiziana Bardaro, M.Amalia Ambruzzi, Leopoldo Zelante, Alfredo Ciccodicola, Gianfranco Sebastio, Michele D’Urso, Generoso Andria,

Peroxisome Proliferator-Activated Receptors

The Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive disorder of cholesterol biosynthesis characterised by facial dysmorphisms, mental retardation and multiple congenital anomalies. SLOS is caused by mutations of the human Δ7-sterol reductase (DHCR7) gene and, so far, 19 different mutations have been described. Among these, mutations impairing the activity of the C-terminus appear to be the most severe. Here we report the mutational analysis of the DHCR7 gene in nine Italian SLOS patients. The T93M mutation, previously reported in one patient, results the most frequent one (7/18 alleles) in our survey. Furthermore, we identified three novel mutations, two missense mutations (N407Y and E448K), and a 33 bp deletion spanning part of exon 5 and the donor splice site of intron 5.