Multigenic control of serum adiponectin levels: Evidence for a role of the APM1 gene and a locus on 14q13

C. Menzaghi, T. Ercolino, L. Salvemini, A. Coco, S. H. Kim, G. Fini, A. Doria, V. Trischitta

Research output: Contribution to journalArticlepeer-review

Abstract

Adiponectin is a circulating enhancer of insulin action that is secreted by the adipose tissue. In epidemiological studies, serum levels of this protein predict the risk of type 2 diabetes and cardiovascular events. Serum adiponectin levels have been associated with variants at the adiponectin (APM1) and PPARγ2 loci and have also been linked to markers on 5p15 and 14q13. We investigated the role of these four loci in regulating serum adiponectin in a Caucasian population from Italy. Four haplotype-tagging single-nucleotide polymorphisms (ht-SNPs) (-11377 C>G, -4041 A>C, +45 T>G, and +276 G>T) at the APM1 locus and the PPARγ2 Pro12Ala polymorphism were examined for association with serum adiponectin in 413 unrelated, nondiabetic individuals. Of the five SNPs tested, +276G>T was the only one to be associated with serum adiponectin (P = 0.032), with "TT" individuals having higher adiponectin levels than other subjects. In a variance-components analysis of 737 nondiabetic members of 264 nuclear families, adiponectin heritability was 30%, with a small but significant proportion explained by the +276 genotype (P = 0.0034). Suggestive evidence of linkage with adiponectin levels was observed on chromosome 14q13, with a LOD of 2.92 (P = 0.000057) after including the APM1 +276 genotype in the model. No linkage was observed at 5p15. Our data indicate a strong genetic control of serum adiponectin. A small proportion of this can be attributed in our population to variability at the APM1 locus, but an as yet unidentified gene on 14q13 appears to play a much bigger role.

Original languageEnglish
Pages (from-to)170-174
Number of pages5
JournalPhysiol Genomics
Volume19
DOIs
Publication statusPublished - Jan 2005

Keywords

  • Adipocytokines
  • Haplotype-tagging single-nucleotide polymorphisms
  • Heritability
  • Insulin resistance
  • Linkage study

ASJC Scopus subject areas

  • Physiology
  • Genetics

Fingerprint Dive into the research topics of 'Multigenic control of serum adiponectin levels: Evidence for a role of the APM1 gene and a locus on 14q13'. Together they form a unique fingerprint.

Cite this