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

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Jensen, MK; Jensen, RA; Mukamal, KJ; Guo, X; Yao, J; Sun, Q; Cornelis, M; Liu, Y; Chen, M-H; Kizer, JR; Djoussé, L; Siscovick, DS; Psaty, BM; Zmuda, JM; Rotter, JI; Garcia, M; Harris, T; Chen, I; Goodarzi, MO; Nalls, MA; Keller, M; Arnold, AM; Newman, AB; Hoogeveen, RC; Rexrode, KM; Rimm, EB; Hu, FB; Ramachandran, VS; Katz, R; Pankow, JS; Ix, JH

Published Date

  • June 1, 2017

Published In

Volume / Issue

  • 26 / 11

Start / End Page

  • 2156 - 2163

PubMed ID

  • 28379451

Pubmed Central ID

  • 28379451

Electronic International Standard Serial Number (EISSN)

  • 1460-2083

Digital Object Identifier (DOI)

  • 10.1093/hmg/ddx091

Language

  • eng

Conference Location

  • England