Genetically elevated fetuin- A levels, fasting glucose levels, and risk of type 2 diabetes: The cardiovascular health study

Majken K. Jensen, Traci M. Bartz, Luc Djousse, Jorge R. Kizer, Susan J. Zieman, Eric B. Rimm, David S. Siscovick, Bruce M. Psaty, H. Joachim, Kenneth J. Mukamal

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

OBJECTIVE Fetuin-A levels are associated with higher risk of type 2 diabetes, but it is unknown if the association is causal. We investigated common (.5%) genetic variants in the fetuin-A gene (AHSG) fetuin-A levels, fasting glucose, and risk of type 2 diabetes. RESEARCH DESIGN ANDMETHODSdGenetic variation, fetuin-A levels, and fasting glucose were assessed in 2,893 Caucasian and 542 African American community-living individuals 65 years of age or older in 1992-1993. RESULTSdCommonAHSG variants (rs4917 and rs2248690) were strongly associated with fetuin- A concentrations (P , 0.0001). In analyses of 259 incident cases of type 2 diabetes, the single nucleotide polymorphisms (SNPs) were not associatedwith diabetes risk during follow-up and similar null associationswere observed when 579 prevalent cases were included. As expected, higher fetuin-A levels were associated with higher fasting glucose concentrations (1.9 mg/dL [95%CI, 1.2-2.7] higher per SDin Caucasians), butMendelian randomization analyses using both SNPs as unbiased proxies for measured fetuin-A did not support an association between genetically predicted fetuin-A levels and fasting glucose (20.3 mg/dL [95% CI, 21.9 to 1.3] lower per SD in Caucasians). The difference between the associations of fasting glucose with actual and genetically predicted fetuin-A level was statistically significant (P = 0.001). Results among the smaller sample of African Americans trended in similar directions but were statistically insignificant. CONCLUSIONSdCommon variants in the AHSG gene are strongly associated with plasma fetuin-A concentrations, but not with risk of type 2 diabetes or glucose concentrations, raising the possibility that the association between fetuin-A and type 2 diabetes may not be causal.

Original languageEnglish (US)
Pages (from-to)3121-3127
Number of pages7
JournalDiabetes care
Volume36
Issue number10
DOIs
StatePublished - Oct 2013

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Advanced and Specialized Nursing

Fingerprint Dive into the research topics of 'Genetically elevated fetuin- A levels, fasting glucose levels, and risk of type 2 diabetes: The cardiovascular health study'. Together they form a unique fingerprint.

Cite this