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Diabetes 53:2153-2157, 2004
© 2004 by the American Diabetes Association, Inc.
Brief Genetics Report |
SREBF-1 Gene Polymorphisms Are Associated With Obesity and Type 2 Diabetes in French Obese and Diabetic Cohorts
1 INSERM Unit 465, University Pierre et Marie Curie, Paris, France
2 Department of Nutrition, INSERM Avenir, Paris, France
3 Institute of Biology, CNRS Unit MR 8090, Pasteur Institute, Lille, France
4 Centre d’étude du Polymorphisme Humain, Paris, France
5 Hammersmith Genome Centre and Genomic Medicine, Imperial College, London, U.K
Sterol regulatory element–binding protein (SREBP)-1 transcription factors play a central role in energy homeostasis by promoting glycolysis, lipogenesis, and adipogenesis. The sterol regulatory element–binding protein gene (SREBF)-1 is a good candidate gene for obesity and obesity-related metabolic traits such as type 2 diabetes and dyslipidemia. The SREBF-1 molecular screening of 40 unrelated obese patients by PCR/single-strand conformation polymorphism revealed 19 single nucleotide polymorphisms (SNPs). Six SNPs were genotyped for an association study in large French obese and nonobese cohorts. Case-control studies using two independent nonobese cohorts indicated that SNP17 (54G/C, exon 18c) is associated with morbid obesity (odds ratio 1.5, P = 0.006 and P = 0.02, respectively). SNP3 (–150G/A, exon 1a), SNP5 (–36delG, exon 1a), and SNP17 are found in high linkage disequilibrium (D' > 0.8). The haplotype including wild-type alleles of these SNPs (C/G/G/T/C/G, HAP2) is identified as a risk factor for morbid obesity (P = 0.003). In the obese group, SNP3, SNP5, and SNP17 are associated with male-specific hypertriglyceridemia (P = 0.07, P = 0.01, and P = 0.05, respectively). SNP17 is also associated with type 2 diabetes (P = 0.03) and increased prevalence of nephropathy (P = 0.028) in a diabetic cohort. Our results indicate a role of the SREBF-1 gene in genetic predisposition of metabolic diseases such as obesity, type 2 diabetes, and dyslipidemia.
Address correspondence and reprint requests to Karine Clément, Department of Nutrition, Hôtel-Dieu, 75181 Paris cedex 04, France. E-mail: karine.clement{at}htd.ap-hop-paris.fr
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