Interaction between Pro12Ala polymorphism of PPARγ2 and diet on adiposity phenotypes

Area of Science:

• Genetics and Nutrigenomics
• Human Physiology
• Metabolic Health

Background:

• The Pro12Ala polymorphism in the peroxisome proliferator-activated receptor gamma 2 (PPARγ2) gene is associated with variations in body weight and adiposity.
• Understanding how diet interacts with this genetic variation is crucial for personalized health strategies.

Purpose of the Study:

• To systematically review and synthesize literature on the extent to which diet modulates the effects of the PPARγ2 Pro12Ala polymorphism on body weight and adiposity.
• To clarify the role of dietary factors in individuals carrying the Ala allele.

Main Methods:

• Systematic literature search and qualitative synthesis of observational and experimental studies in adults.
• Review focused on studies examining diet, body weight, BMI, body composition, and metabolic parameters in relation to PPARγ2 genotype.

Main Results:

• Observational studies showed inconsistent results, potentially due to methodological differences.
• Dietary energy content and composition appear to influence BMI, body composition, and metabolic parameters more in Ala allele carriers than Pro/Pro homozygotes.
• Intervention studies indicate Ala carriers are more prone to weight loss with healthy lifestyles but may not sustain benefits with poor dietary habits.

Conclusions:

• Diet plays a significant role in modulating the impact of the PPARγ2 Pro12Ala polymorphism on adiposity.
• Future research requires well-designed, adequately powered studies with standardized dietary assessment tools and biomarkers to advance understanding.