Genome-wide association study of selenium concentrations.

Abstract:

:Selenium (Se) is an essential trace element in human nutrition, but its role in certain health conditions, particularly among Se sufficient populations, is controversial. A genome-wide association study (GWAS) of blood Se concentrations previously identified a locus at 5q14 near BHMT. We performed a GW meta-analysis of toenail Se concentrations, which reflect a longer duration of exposure than blood Se concentrations, including 4162 European descendants from four US cohorts. Toenail Se was measured using neutron activation analysis. We identified a GW-significant locus at 5q14 (P < 1 × 10(-16)), the same locus identified in the published GWAS of blood Se based on independent cohorts. The lead single-nucleotide polymorphism (SNP) explained ∼1% of the variance in toenail Se concentrations. Using GW-summary statistics from both toenail and blood Se, we observed statistical evidence of polygenic overlap (P < 0.001) and meta-analysis of results from studies of either trait (n = 9639) yielded a second GW-significant locus at 21q22.3, harboring CBS (P < 4 × 10(-8)). Proteins encoded by genes at 5q14 and 21q22.3 function in homocysteine (Hcy) metabolism, and index SNPs for each have previously been associated with betaine and Hcy levels in GWAS. Our findings show evidence of a genetic link between Se and Hcy pathways, both involved in cardiometabolic disease.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Cornelis MC,Fornage M,Foy M,Xun P,Gladyshev VN,Morris S,Chasman DI,Hu FB,Rimm EB,Kraft P,Jordan JM,Mozaffarian D,He K

doi

10.1093/hmg/ddu546

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

1469-77

issue

5

eissn

0964-6906

issn

1460-2083

pii

ddu546

journal_volume

24

pub_type

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