A common variant in the CLDN7/ELP5 locus predicts adiponectin change with lifestyle intervention and improved fitness in obese individuals with diabetes

Look AHEAD Research Group

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Overweight/obese individuals with Type 2 diabetes have low adiponectin levels, which may improve with lifestyle changes. We investigated whether genetic variants associated with adiponectin levels in genome-wide association studies (GWAS) would also be related with adiponectin changes in response to an intensive lifestyle intervention (ILI), potentially through mechanisms altering the adipose microenvironment via weight loss and/or improved cardiorespiratory fitness. Look AHEAD was a randomized trial comparing the cardiovascular benefits of ILI-induced weight loss and physical activity compared with diabetes support and education among overweight/obese individuals with Type 2 diabetes. In a subsample of Look AHEAD with adiponectin data and genetic consent (n = 1,351), we evaluated the effects of 24 genetic variants, demonstrated by GWAS to be cross-sectionally associated with adiponectin, on adiponectin change 1-yr postintervention. We explored via mediational analyses whether any differential effects by treatment arm were occurring through weight loss and/or improved fitness. A variant, rs222857, in the CLDN7 locus, potentially associated with epithelial barrier integrity and tight junction physiology, and a putative cis expression quantitative trail locus for elongator acetyltransferase complex subunit 5 (ELP5), predicted adiponectin increases within ILI (log-adiponectin in overall sample per copy: β ± SE = 0.05 ± 0.02, P = 0.008; in non-Hispanic whites: 0.06 ± 0.02, P = 0.009). The favorable effects of rs222857 (minor allele frequency 45.5%) appeared to be mediated by mechanisms associated with improved fitness, and not weight loss. This is the first study to identify a genetic variant that modifies adiponectin response to lifestyle intervention in overweight/obese diabetic individuals.

Original languageEnglish (US)
Pages (from-to)215-224
Number of pages10
JournalPhysiological Genomics
Volume47
Issue number6
DOIs
StatePublished - Jun 1 2015

Keywords

  • Adipose tissue
  • DERP6
  • Elongator
  • Epithelial permeability
  • Exercise
  • Lifestyle intervention
  • Look AHEAD
  • Mediation
  • Sirtuin
  • Tight junction
  • Weight loss
  • p53
  • r3507506

ASJC Scopus subject areas

  • Physiology
  • Genetics

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