Detection of genetic loci associated with plasma fetuin-A: A meta-analysis of genome-wide association studies from the CHARGE Consortium

Majken K. Jensen, Richard A. Jensen, Kenneth J. Mukamal, Xiuqing Guo, Jie Yao, Qi Sun, Marilyn Cornelis, Yongmei Liu, Ming Huei Chen, Jorge R. Kizer, Luc Djoussé, David S. Siscovick, Bruce M. Psaty, Joseph M. Zmuda, Jerome I. Rotter, Melissa Garcia, Tamara Harris, Ida Chen, Mark O. Goodarzi, Michael A. NallsMargaux Keller, Alice M. Arnold, Anne B. Newman, Ron C. Hoogeveen, Kathryn M. Rexrode, Eric B. Rimm, Frank B. Hu, Vasan S. Ramachandran, Ronit Katz, James S. Pankow, Joachim H. Ix*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Plasma fetuin-A is associated with type 2 diabetes, and AHSG, the gene encoding fetuin-A, has been identified as a susceptibility locus for diabetes and metabolic syndrome. Thus far, unbiased investigations of the genetic determinants of plasma fetuin-A concentrations have not been conducted. We searched for single nucleotide polymorphisms (SNPs) related to fetuin- A concentrations by a genome-wide association study in six population-based studies. We examined the association of fetuin-A levels with ~ 2.5 million genotyped and imputed SNPs in 9,055 participants of European descent and 2,119 African Americans. In both ethnicities, the strongest associations were centered in a region with a high degree of LD near the AHSG locus. Among 136 genome-wide significant (P < 0.05 × 10-8) SNPs near the AHSG locus, the top SNP was rs4917 (P=1.27×10-303), a known coding SNP in exon 6 that is associated with a 0.06 g/l (~13%) lower fetuin-A level. This variant alone explained 14% of the variation in fetuin-A levels. Analyses conditioned on rs4917 indicated that the strong association with the AHSG locus stems from additional independent associations of multiple variants among European Americans. In conclusion, levels of fetuin-A in plasma are strongly associated with SNPs in its encoding gene, AHSG, but not elsewhere in the genome. Given the strength of the associations observed for multiple independent SNPs, the AHSG gene is an example of a candidate locus suitable for additional investigations including fine mapping to elucidate the biological basis of the findings and further functional experiments to clarify AHSG as a potential therapeutic target.

Original languageEnglish (US)
Pages (from-to)2156-2163
Number of pages8
JournalHuman molecular genetics
Volume26
Issue number11
DOIs
StatePublished - 2017

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

Fingerprint Dive into the research topics of 'Detection of genetic loci associated with plasma fetuin-A: A meta-analysis of genome-wide association studies from the CHARGE Consortium'. Together they form a unique fingerprint.

Cite this