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Gutiérrez-Aguilar R, Benmezroua Y, Vaillant E, Balkau B, Marre M, Charpentier G, Sladek R, Froguel P, Neve B. Analysis of KLF transcription factor family gene variants in type 2 diabetes. BMC MEDICAL GENETICS 2007; 8:53. [PMID: 17688680 PMCID: PMC1994949 DOI: 10.1186/1471-2350-8-53] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/20/2007] [Accepted: 08/09/2007] [Indexed: 01/07/2023]
Abstract
Background The Krüppel-like factor (KLF) family consists of transcription factors that can activate or repress different genes implicated in processes such as differentiation, development, and cell cycle progression. Moreover, several of these proteins have been implicated in glucose homeostasis, making them candidate genes for involvement in type 2 diabetes (T2D). Methods Variants of nine KLF genes were genotyped in T2D cases and controls and analysed in a two-stage study. The first case-control set included 365 T2D patients with a strong family history of T2D and 363 normoglycemic individuals and the second set, 750 T2D patients and 741 normoglycemic individuals, all of French origin. The SNPs of six KLF genes were genotyped by Taqman® SNP Genotyping Assays. The other three KLF genes (KLF2, -15 and -16) were screened and the identified frequent variants of these genes were analysed in the case-control studies. Results Three of the 28 SNPs showed a trend to be associated with T2D in our first case-control set (P < 0.10). These SNPs, located in the KLF2, KLF4 and KLF5 gene were then analysed in our second replication set, but analysis of this set and the combined analysis of the three variants in all 2,219 individuals did not show an association with T2D in this French population. As the KLF2, -15 and -16 variants were representative for the genetic variability in these genes, we conclude they do not contribute to genetic susceptibility for T2D. Conclusion It is unlikely that variants in different members of the KLF gene family play a major role in T2D in the French population.
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Affiliation(s)
- Ruth Gutiérrez-Aguilar
- UMR8090, CNRS, Institute of Biologie/Institute Pasteur de Lille, Lille, France
- Université de Lille 2, Lille, France
| | - Yamina Benmezroua
- UMR8090, CNRS, Institute of Biologie/Institute Pasteur de Lille, Lille, France
- Université de Lille 2, Lille, France
| | - Emmanuel Vaillant
- UMR8090, CNRS, Institute of Biologie/Institute Pasteur de Lille, Lille, France
- Université de Lille 2, Lille, France
| | - Beverley Balkau
- INSERM, U780-IFR69, Villejuif, France
- U780-IFR69, Université Paris-Sud, Villejuif, France
| | - Michel Marre
- U695, INSERM, Xavier Bichat Faculty of Medicine, Université Paris 7, Paris, France
- Hospital Bichat – Claude Bernard, Paris, France
| | | | - Rob Sladek
- Human Genetics and Medicine, Faculty of Medicine, McGill University, Montreal, Canada
- Genome, Quebec Innovation Centre, Montreal, Canada
| | - Philippe Froguel
- UMR8090, CNRS, Institute of Biologie/Institute Pasteur de Lille, Lille, France
- Université de Lille 2, Lille, France
- Genomic Medicine, Hammersmith Hospital, Imperial College London, UK
- Genomic Medicine, Hammersmith Hospital, Imperial College, Du Cane Road, London W12 0NN, UK
| | - Bernadette Neve
- UMR8090, CNRS, Institute of Biologie/Institute Pasteur de Lille, Lille, France
- Université de Lille 2, Lille, France
- Genomic Medicine, Hammersmith Hospital, Imperial College London, UK
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Abstract
Obesity is the result of an imbalance between food intake and energy expenditure resulting in the storing of energy as fat. Adipose tissue contains the largest store of energy in the body and plays important roles in regulating energy partitioning. Developments in genomics, in particular microarray-based expression profiling, have provided scientists with a number of new candidate genes whose expression in adipose tissue is regulated by obesity. Integrating expression profiles with genome-wide linkage and/or association analyses is a promising strategy to identify new genes underlying susceptibility to obesity. This article provides a comprehensive review of adipose-tissue-expressed genes implicated in predisposition to human obesity. The authors consider the following genes of particular interest: peroxisome proliferator-activated receptor gamma and, potentially, INSIG2 acting in adipogenesis; the adrenoreceptors beta 2 and 3, as well as hormone-sensitive lipase acting on lipolysis; uncoupling protein 2 acting in mitochondria energy expenditure; and among secreted molecules the cytokine tumor necrosis factor alpha and the hormone leptin. With the rapid development in genome research, we predict that additional alleles in genes regulating adipose tissue function will be established as risk factors for common obesity in the coming years. This has important implications for the prevention of obesity and may also offer new therapeutic targets.
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Affiliation(s)
- I Dahlman
- Department of Medicine, Huddinge, Karolinska Institute, Stockholm, Sweden.
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