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01.12.2006 | ORIGINAL CONTRIBUTION

Genotype-by-nutrient interactions assessed in European obese women

A case-only study

verfasst von: Jose L. Santos, Philippe Boutin, Camilla Verdich, Claus Holst, Lesli H. Larsen, Soren Toubro, Christian Dina, Wim H.M. Saris, Ellen E. Blaak, Johnatan Hoffstedt, Moira A. Taylor, Jan Polak, Karine Clement, Dominique Langin, Arne Astrup, Philippe Froguel, Oluf Pedersen, Thorkild I.A. Sorensen, J. Alfredo Martinez, The NUGENOB* consortium

Erschienen in: European Journal of Nutrition | Ausgabe 8/2006

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Abstract

Background

The development of obesity is influenced by both genetic and environmental risk factors. Whereas changes in the environment appear to be responsible for the increasing prevalence of obesity, genetic factors interacting with environmental factors would contribute to explain obesity onset and severity.

Aim

To explore epidemiologic genotype-by-nutrient interactions in obesity.

Methods

A total of 42 polymorphisms of 26 candidate genes for obesity were genotyped in 549 adult obese women recruited from eight European centres in a case-only study. The nutritional variables assessed in this study were the dietary fibre intake (grams per day), the ratio of dietary polyunsaturated fat to saturated fat (P:S ratio) and the percentage of energy derived from fat in the diet as calculated from a weighed three-day food record (%E). Under the assumption of genotype-nutrient independence in the population, the odds ratio calculated in a sample of obese women would indicate the existence of genotype-by-nutrient interactions, measured as deviations from the multiplicative effects of the genetic and the nutrient factors separately.

Results

No new but confirmaty evidences for genotype-by-nutrient interactions in obesity were detected in this case-only study. The test of interaction between fibre intake and the −514 C > T polymorphism of the hepatic lipase gene (LIPC) yielded P-values of 0.01 across different statistical models. Likewise, the −11377G > C polymorphism of the adiponectin gene (ADIPOQ) and the −681 C > G polymorphism of the PPARG3 gene might interact with the percentage of energy derived from fat in the diet for the development of obesity (P-values in the range of 0.01–0.05 across different statistical models). The P-values were not adjusted for multiple testing, so these results should be considered with caution.

Conclusions

Although the use of obese-only samples is theoretically a useful approach to detect interactions, few genotype-by-nutrient interactions have been suggested in obese European women after the analysis of candidate polymorphisms and the selected nutrient variables. The most remarkable multiplicative interaction found in this study refers to the combination of the hepatic lipase gene polymorphism −514 C > T and fibre intake.

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Titel: Genotype-by-nutrient interactions assessed in European obese women
A case-only study
verfasst von: Jose L. Santos
Philippe Boutin
Camilla Verdich
Claus Holst
Lesli H. Larsen
Soren Toubro
Christian Dina
Wim H.M. Saris
Ellen E. Blaak
Johnatan Hoffstedt
Moira A. Taylor
Jan Polak
Karine Clement
Dominique Langin
Arne Astrup
Philippe Froguel
Oluf Pedersen
Thorkild I.A. Sorensen
J. Alfredo Martinez
The NUGENOB* consortium
Publikationsdatum: 01.12.2006
Verlag: Steinkopff-Verlag
Erschienen in: European Journal of Nutrition / Ausgabe 8/2006
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI: https://doi.org/10.1007/s00394-006-0619-6

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Genotype-by-nutrient interactions assessed in European obese women

A case-only study