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Meta-Analysis
. 2017 Dec 7;101(6):888-902.
doi: 10.1016/j.ajhg.2017.09.028. Epub 2017 Nov 30.

DNA Methylation Analysis Identifies Loci for Blood Pressure Regulation

Collaborators, Affiliations
Meta-Analysis

DNA Methylation Analysis Identifies Loci for Blood Pressure Regulation

Melissa A Richard et al. Am J Hum Genet. .

Abstract

Genome-wide association studies have identified hundreds of genetic variants associated with blood pressure (BP), but sequence variation accounts for a small fraction of the phenotypic variance. Epigenetic changes may alter the expression of genes involved in BP regulation and explain part of the missing heritability. We therefore conducted a two-stage meta-analysis of the cross-sectional associations of systolic and diastolic BP with blood-derived genome-wide DNA methylation measured on the Infinium HumanMethylation450 BeadChip in 17,010 individuals of European, African American, and Hispanic ancestry. Of 31 discovery-stage cytosine-phosphate-guanine (CpG) dinucleotides, 13 replicated after Bonferroni correction (discovery: N = 9,828, p < 1.0 × 10-7; replication: N = 7,182, p < 1.6 × 10-3). The replicated methylation sites are heritable (h2 > 30%) and independent of known BP genetic variants, explaining an additional 1.4% and 2.0% of the interindividual variation in systolic and diastolic BP, respectively. Bidirectional Mendelian randomization among up to 4,513 individuals of European ancestry from 4 cohorts suggested that methylation at cg08035323 (TAF1B-YWHAQ) influences BP, while BP influences methylation at cg00533891 (ZMIZ1), cg00574958 (CPT1A), and cg02711608 (SLC1A5). Gene expression analyses further identified six genes (TSPAN2, SLC7A11, UNC93B1, CPT1A, PTMS, and LPCAT3) with evidence of triangular associations between methylation, gene expression, and BP. Additional integrative Mendelian randomization analyses of gene expression and DNA methylation suggested that the expression of TSPAN2 is a putative mediator of association between DNA methylation at cg23999170 and BP. These findings suggest that heritable DNA methylation plays a role in regulating BP independently of previously known genetic variants.

Keywords: DNA methylation; Mendelian randomization; blood pressure; epigenome-wide association study; gene expression; sequence variation.

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Figures

Figure 1
Figure 1
Percent Variance Explained by Traditional Covariates and Methylation Profile Scores for Systolic and Diastolic BP The plot presents adjusted R2 values from covariate-adjusted models including a methylation profile risk score based on methylation CpG sites identified to be associated with BP in the overall and replication meta-analyses. The number of CpG sites included in the methylation profile scores is indicated as n. Percent variance explained for the CpG sites identified in the primary replication and overall meta-analyses was calculated among an independent sample from FHS. The two ARIC samples participating in the discovery and replication stages were excluded from meta-analyses used to identify CpGs for their respective methylation risk scores, which caused the sets of methylation sites to differ. Abbreviations: AA, African American; ARIC, Atherosclerosis Risk in Communities; BP, blood pressure; CpG, cytosine-phosphate-guanine; EA, European ancestry; FHS, Framingham Heart Study.
Figure 2
Figure 2
Distribution of Unpruned 1000 Genomes Imputed SNPs Assessed for Association with Methylation Relative to the CpG Location (±25 kb) SNP position relative to the replicated methylation CpG position (X = 0) is plotted against –log10 of the p value for meQTL meta-analysis in each race. SNPs above the red line are significant after Bonferroni correction for multiple testing (p < 3.0 × 10−5). Abbreviations: AA, African American; bp, base pair; CpG, cytosine-phosphate-guanine; EA, European ancestry; meQTL, methylation quantitative trait locus; SNP, single-nucleotide polymorphism.
Figure 3
Figure 3
Illustration of the Relationship of Methylation at cg23999170 with Diastolic BP, Mediated by Expression of TSPAN2 Methylation at cg23999170 was identified as associated with diastolic BP in discovery and replication meta-analyses of genome-wide DNA methylation (N = 17,010). Expression of TSPAN2 was associated with methylation at cg23999170 in meta-analyses of FHS and RS and diastolic BP in FHS. The direction of arrows in the diagram are inferred from significant two-step Mendelian randomization using data from the Genotype-Tissue Expression project and International Consortium for Blood Pressure, which suggests that methylation at cg23999170 influences BP through the expression of TSPAN2. The epigenome-wide association of DNA methylation and diastolic BP is interpreted given the evidence of causal direction and based on a 0.1% change in DNA methylation at cg23999170. Abbreviation: DBP, diastolic blood pressure.

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