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Meta-Analysis
. 2019 Aug 20;140(8):645-657.
doi: 10.1161/CIRCULATIONAHA.118.039357. Epub 2019 Aug 19.

Blood Leukocyte DNA Methylation Predicts Risk of Future Myocardial Infarction and Coronary Heart Disease

Affiliations
Meta-Analysis

Blood Leukocyte DNA Methylation Predicts Risk of Future Myocardial Infarction and Coronary Heart Disease

Golareh Agha et al. Circulation. .

Abstract

Background: DNA methylation is implicated in coronary heart disease (CHD), but current evidence is based on small, cross-sectional studies. We examined blood DNA methylation in relation to incident CHD across multiple prospective cohorts.

Methods: Nine population-based cohorts from the United States and Europe profiled epigenome-wide blood leukocyte DNA methylation using the Illumina Infinium 450k microarray, and prospectively ascertained CHD events including coronary insufficiency/unstable angina, recognized myocardial infarction, coronary revascularization, and coronary death. Cohorts conducted race-specific analyses adjusted for age, sex, smoking, education, body mass index, blood cell type proportions, and technical variables. We conducted fixed-effect meta-analyses across cohorts.

Results: Among 11 461 individuals (mean age 64 years, 67% women, 35% African American) free of CHD at baseline, 1895 developed CHD during a mean follow-up of 11.2 years. Methylation levels at 52 CpG (cytosine-phosphate-guanine) sites were associated with incident CHD or myocardial infarction (false discovery rate<0.05). These CpGs map to genes with key roles in calcium regulation (ATP2B2, CASR, GUCA1B, HPCAL1), and genes identified in genome- and epigenome-wide studies of serum calcium (CASR), serum calcium-related risk of CHD (CASR), coronary artery calcified plaque (PTPRN2), and kidney function (CDH23, HPCAL1), among others. Mendelian randomization analyses supported a causal effect of DNA methylation on incident CHD; these CpGs map to active regulatory regions proximal to long non-coding RNA transcripts.

Conclusion: Methylation of blood-derived DNA is associated with risk of future CHD across diverse populations and may serve as an informative tool for gaining further insight on the development of CHD.

Keywords: coronary artery disease; coronary heart disease; epigenetics; gene expression regulation; genomics.

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Figures

Figure 1.
Figure 1.
Overall analytic workflow. Af. Am. denotes individuals of African-American ancestry; Eur denotes individuals of European ancestry. meQTLs: methylation quantitative trait loci.
Figure 2.
Figure 2.
Plot of effect sizes (i.e., log hazard ratios) and 95% confidence intervals (CIs) for the 52 coronary heart disease (CHD)-associated CpG DNA methylation sites, comparing results from the incident CHD meta-analysis (blue) vs the incident MI-only meta-analysis (orange).
Figure 3.
Figure 3.
Adapted UCSC genome browser image - for genomic location of CpGs cg07289306 and cg26470101. The red zoom-in triangles are our addition to the UCSC image (http://genome.ucsc.edu), and represent a magnified region corresponding to the red marked region on each chromosome. The yellow highlights are also our addition, and highlight the exact genomic location of each CpG

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