Gene - Diet Interactions (Genediet)
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Interactions between genes and environment, i.e. our inherited responses to environmental changes, may be crucial in the development of the common diseases. The investigators were the first to identify PPARG gene as risk gene for type 2 diabetes. The role of the Pro12Ala polymorphism in diabetes risk has also been verified in meta-analysis. However, this effect on seems to depend on intervention and age. In this study the effects of diets high with saturated fatty acids (SAFA) and polyunsaturated fatty acids (PUFA) are compared in subjects carrying either Pro12Pro or Ala12Ala genotype of the PPARG gene.
Aim of the study:
To test if subjects with Pro12Pro and Ala12Ala genotypes respond differentially to a diet supplemented with high saturated (SAFA) or polyunsaturated fat (PUFA).
Hypotheses:
- Specific: Subjects with the Ala12Ala genotype will be more sensitive to dietary modification, and therefore respond more favorably to PUFA diet
- More general: Dietary instructions individually tailored according to the genotype would allow better treatment of obesity and diabetes
Condition | Intervention |
---|---|
Insulin Sensitivity |
Other: PUFA-diet Other: SAFA-diet |
Study Type: | Interventional |
Study Design: | Allocation: Randomized Intervention Model: Crossover Assignment Masking: Open Label Primary Purpose: Prevention |
Official Title: | Gene-diet Interactions |
- insulin sensitivity [ Time Frame: week 0 ] [ Designated as safety issue: No ]insulin sensitivity measured by oral glucose tolerance test at the beginning of the first, randomised diet
- insulin sensitivity [ Time Frame: week 8 ] [ Designated as safety issue: No ]insulin sensitivty measured by oral glucose tolerance test after the first diet
- insulin sensitivity [ Time Frame: week 10 ] [ Designated as safety issue: No ]Insulin sensitivity measured by oral glucose tolerance test in the beginning of the second, randomised diet
- insulin sensitivity [ Time Frame: week 18 ] [ Designated as safety issue: No ]insulin sensitivity measured by oral glucose tolerance test after the second diet
- peripheral blood mononuclear cell gene expression [ Time Frame: week 8 ] [ Designated as safety issue: No ]
- peripheral blood mononuclear cell gene expression [ Time Frame: week 18 ] [ Designated as safety issue: No ]
- serum lipids [ Time Frame: week 8 ] [ Designated as safety issue: No ]serum lipids, including serum lipidomics and fatty acid composition
- serum lipids [ Time Frame: week 18 ] [ Designated as safety issue: No ]serum lipids, including serum lipidomics and fatty acid composition
- inflammation [ Time Frame: week 8 ] [ Designated as safety issue: No ]inflammation measured as serum cytokines and adipose tissue inflammation
- inflammation [ Time Frame: week 18 ] [ Designated as safety issue: No ]inflammation measured as serum cytokines and adipose tissue inflammation
- energy expenditure [ Time Frame: week 8 ] [ Designated as safety issue: No ]energy expenditure and the rates of substrate oxidation
- energy expenditure [ Time Frame: week 18 ] [ Designated as safety issue: No ]energy expenditure and the rates of substrate oxidation
- insulin secretion [ Time Frame: week 8 ] [ Designated as safety issue: No ]
- insulin secretion [ Time Frame: week 18 ] [ Designated as safety issue: No ]
- adipose tissue gene expression [ Time Frame: week 8 ] [ Designated as safety issue: No ]
- adipose tissue gene expression [ Time Frame: week 18 ] [ Designated as safety issue: No ]
Enrollment: | 30 |
Study Start Date: | August 2010 |
Study Completion Date: | December 2011 |
Primary Completion Date: | June 2011 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
---|---|
Experimental: P/S-ratio 1.0
Diets will contain 30% of energy as fat, 18% as protein and 52% as carbohydrates: polyunsaturated fatty acid diet (PUFA) will have P/S ratio 1.0. |
Other: PUFA-diet
Diets will contain 30% of energy as fat, 18% as protein and 52% as carbohydrates: polyunsaturated fatty acid diet (PUFA) will have P/S ratio 1.0.
|
Experimental: P/S-ration 0.3
Diets will contain 30% of energy as fat, 18% as protein and 52% as carbohydrates:. Saturated fatty acid diet (SAFA) will polyunsaturated/saturated (P/S) ratio of 0.3.
|
Other: SAFA-diet
Diets will contain 30% of energy as fat, 18% as protein and 52% as carbohydrates: Saturated fatty acid diet (SAFA) will polyunsaturated/saturated (P/S) ratio of 0.3.
|
Detailed Description:
Obesity and type 2 diabetes are increasing in all western countries, including Finland. Recent genome wide analyses have found > 30 genes that contribute to either condition.. However, none of these genes explain >5% of the disease risk and altogether they explain < 10% of the total disease risk in cross-sectional studies. Therefore, diet and physical activity are still the major determinants of the risk, as demonstrated by our earlier intervention studies in order to find out the effect of different dietary modifications on glucose and lipid metabolism. More importantly, interactions between genes and environment, i.e. our inherited responses to environmental changes, may be crucial in the development of the common diseases. Unfortunately, gene-environment interaction can only be effectively investigated in intervention studies that are more expensive than cross-sectional population screenings. This leads to a lower sample size and reduced power to detect effects of minor alleles. Despite these limitations the investigators have been able to demonstrate gene-intervention interactions for several genes, including PPARG, in the Finnish Diabetes Prevention study. There is an urgent need for studies investigating effects of tailored diets in individuals selected based on their genotype. This will be the next essential step leading to improved dietary treatments guided by genetic information.
The investigators were the first to identify PPARG gene as risk gene for type 2 diabetes. The role of the Pro12Ala polymorphism in diabetes risk has also been verified in meta-analysis. However, this effect on seems to depend on intervention and age. Based on these findings the investigators created in collaboration with Johan Auwerx an Pro12Ala animal model that demonstrated a differential effect of dietary fat composition depending on the genotype. However, an important conclusive proof that subjects selected based on their Pro12Ala genotype would respond differently to specifically tailored diet modification is still needed.
In this study the effects of diets high with saturated fatty acids (SAFA) and polyunsaturated fatty acids (PUFA) are compared in subjects carrying either Pro12Pro or Ala12Ala genotype of the PPARG gene. As a primary endpoint the investigators expect insulin sensitivity to alter differently depending on the genotype. Additionally, a detailed characterization of energy, glucose and lipid metabolism will be performed. Because PPARG gene plays a central role in adipogenesis one of the aims of this study is to find new pathways, genes and gene clusters that are regulated by PPARG in humans.
Ages Eligible for Study: | 40 Years to 65 Years |
Genders Eligible for Study: | Male |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
- BMI >20kg/m2 <29kg/m2
- Pro12Pro and Ala12Ala genotypes of PPARG Pro12Ala polymorphism
- participation to METSIM-study (METabolic Syndrome in Men, currently >10000 men included from the population living in Kuopio, principal investigator Markku Laakso)
- normoglycemia
Exclusion Criteria:
- type 2 diabetes
- other chronic diseases
Finland | |
University of Eastern Finland | |
Kuopio, Finland, FIN-70211 |
Principal Investigator: | Jussi Pihlajamäki, Professor | University of Eastern Finland, Kuopio University Hospital |
Study Director: | Ursula S Schwab, Clinical Lect, adjunct prof | University of Eastern Finland |
Study Chair: | Matti Uusitupa, Professor | Professor |
No publications provided
Responsible Party: | Marjukka Kolehmainen, Senior scientist, University of Eastern Finland |
ClinicalTrials.gov Identifier: | NCT01274091 History of Changes |
Other Study ID Numbers: | 28//2010 |
Study First Received: | January 10, 2011 |
Last Updated: | April 16, 2012 |
Health Authority: | Finland: Ethics Committee |
Keywords provided by University of Eastern Finland:
Gene-diet interaction PPARgamma gene Pro12Ala Fatty acids |
Dietary modification Insulin sensitivity Glucose metabolism |
Additional relevant MeSH terms:
Insulin Resistance Hyperinsulinism Glucose Metabolism Disorders Metabolic Diseases |
ClinicalTrials.gov processed this record on October 18, 2012