Association between the APOA2 promoter polymorphism and body weight in Mediterranean and Asian populations: replication of a gene-saturated fat interaction

Int J Obes (Lond). 2011 May;35(5):666-75. doi: 10.1038/ijo.2010.187. Epub 2010 Oct 26.

Abstract

Objective: The APOA2 gene has been associated with obesity and insulin resistance (IR) in animal and human studies with controversial results. We have reported an APOA2-saturated fat interaction determining body mass index (BMI) and obesity in American populations. This work aims to extend our findings to European and Asian populations.

Methods: Cross-sectional study in 4602 subjects from two independent populations: a high-cardiovascular risk Mediterranean population (n = 907 men and women; aged 67 ± 6 years) and a multiethnic Asian population (n = 2506 Chinese, n = 605 Malays and n = 494 Asian Indians; aged 39 ± 12 years) participating in a Singapore National Health Survey. Anthropometric, clinical, biochemical, lifestyle and dietary variables were determined. Homeostasis model assessment of insulin resistance was used in Asians. We analyzed gene-diet interactions between the APOA2 -265T>C polymorphism and saturated fat intake (<or ≥ 22 g per day) on anthropometric measures and IR.

Results: Frequency of CC (homozygous for the minor allele) subjects differed among populations (1-15%). We confirmed a recessive effect of the APOA2 polymorphism and replicated the APOA2-saturated fat interaction on body weight. In Mediterranean individuals, the CC genotype was associated with a 6.8% greater BMI in those consuming a high (P = 0.018), but not a low (P = 0.316) saturated fat diet. Likewise, the CC genotype was significantly associated with higher obesity prevalence in Chinese and Asian Indians only, with a high-saturated fat intake (P = 0.036). We also found a significant APOA2-saturated fat interaction in determining IR in Chinese and Asian Indians (P = 0.026).

Conclusion: The influence of the APOA2 -265T>C polymorphism on body-weight-related measures was modulated by saturated fat in Mediterranean and Asian populations.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Aged
  • Alleles
  • Apolipoprotein A-II / genetics*
  • Asian Continental Ancestry Group / ethnology
  • Asian Continental Ancestry Group / genetics*
  • Body Mass Index
  • Body Weight / ethnology
  • Body Weight / genetics*
  • Cardiovascular Diseases / epidemiology
  • Cardiovascular Diseases / ethnology
  • Cardiovascular Diseases / genetics*
  • Cross-Sectional Studies
  • Dietary Fats / adverse effects
  • European Continental Ancestry Group / ethnology
  • European Continental Ancestry Group / genetics*
  • Female
  • Genetic Predisposition to Disease
  • Genotype
  • Humans
  • Insulin Resistance / ethnology
  • Insulin Resistance / genetics
  • Male
  • Obesity / epidemiology
  • Obesity / ethnology
  • Obesity / genetics*
  • Polymorphism, Single Nucleotide

Substances

  • APOA2 protein, human
  • Apolipoprotein A-II
  • Dietary Fats