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Front Genet. 2014 Feb 10;5:22. doi: 10.3389/fgene.2014.00022. eCollection 2014.

Associations of adiponectin with individual European ancestry in African Americans: the Jackson Heart Study.

Frontiers in genetics

Aurelian Bidulescu, Shweta Choudhry, Solomon K Musani, Sarah G Buxbaum, Jiankang Liu, Charles N Rotimi, James G Wilson, Herman A Taylor, Gary H Gibbons

Affiliations

  1. Department of Epidemiology and Biostatistics, Indiana University School of Public Health - Bloomington Bloomington, IN, USA.
  2. Department of Urology, University of California San Francisco, CA, USA.
  3. Jackson Heart Study, University of Mississippi Medical Center Jackson, MS, USA.
  4. Department of Health Sciences, Jackson State University Jackson, MS, USA.
  5. National Human Genome Research Institute, National Institutes of Health Bethesda, MD, USA.
  6. National Heart Lung and Blood Institute, National Institutes of Health Bethesda, MD, USA.

PMID: 24575123 PMCID: PMC3918651 DOI: 10.3389/fgene.2014.00022

Abstract

BACKGROUND: Compared with European Americans, African Americans (AAs) exhibit lower levels of the cardio-metabolically protective adiponectin even after accounting for adiposity measures. Because few studies have examined in AA the association between adiponectin and genetic admixture, a dense panel of ancestry informative markers (AIMs) was used to estimate the individual proportions of European ancestry (PEA) for the AAs enrolled in a large community-based cohort, the Jackson Heart Study (JHS). We tested the hypothesis that plasma adiponectin and PEA are directly associated and assessed the interaction with a series of cardio-metabolic risk factors.

METHODS: Plasma specimens from 1439 JHS participants were analyzed by ELISA for adiponectin levels. Using pseudo-ancestral population genotype data from the HapMap Consortium, PEA was estimated with a panel of up to 1447 genome-wide preselected AIMs by a maximum likelihood approach. Interaction assessment, stepwise linear and cubic multivariable-adjusted regression models were used to analyze the cross-sectional association between adiponectin and PEA.

RESULTS: Among the study participants (62% women; mean age 48 ± 12 years), the median (interquartile range) of PEA was 15.8 (9.3)%. Body mass index (BMI) (p = 0.04) and insulin resistance (p = 0.0001) modified the association between adiponectin and PEA. Adiponectin was directly and linearly associated with PEA (β = 0.62 ± 0.28, p = 0.03) among non-obese (n = 673) and insulin sensitive participants (n = 1141; β = 0.74 ± 0.23, p = 0.001), but not among those obese or with insulin resistance. No threshold point effect was detected for non-obese participants.

CONCLUSIONS: In a large AA population, the individual proportion of European ancestry was linearly and directly associated with plasma adiponectin among non-obese and non insulin-resistant participants, pointing to the interaction of genetic and metabolic factors influencing adiponectin levels.

Keywords: African Americans; adiponectin; cohort study; individual European ancestry; insulin resistance; minorities; obesity

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