Jun 11, 2014

Methylation QTLs are associated with coordinated changes in transcription factor binding, histone modifications, and gene expression levels

BioRxiv : the Preprint Server for Biology
Nicholas E BanovichYoav Gilad

Abstract

DNA methylation is an important epigenetic regulator of gene expression. Recent studies have revealed widespread associations between genetic variation and methylation levels. However, the mechanistic links between genetic variation and methylation remain unclear. To begin addressing this gap, we collected methylation data at ∼300,000 loci in lymphoblastoid cell lines (LCLs) from 64 HapMap Yoruba individuals, and genome-wide bisulfite sequence data in ten of these individuals. We identified (at an FDR of 10%) 13,915 cis methylation QTLs (meQTLs)—i.e., CpG sites in which changes in DNA methylation are associated with genetic variation at proximal loci. We found that meQTLs are frequently associated with changes in methylation at multiple CpGs across regions of up to 3 kb. Interestingly, meQTLs are also frequently associated with variation in other properties of gene regulation, including histone modifications, DNase I accessibility, chromatin accessibility, and expression levels of nearby genes. These observations suggest that genetic variants may lead to coordinated molecular changes in all of these regulatory phenotypes. One plausible driver of coordinated changes in different regulatory mechanisms is variation in transcriptio...Continue Reading

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Mentioned in this Paper

Study
Hydrogen sulfite
DNA Methylation [PE]
Deoxyribonuclease I
Protein Methylation
Genes
Regulation of Biological Process
Changes in DNA Methylation
Cytosine
Genome Assembly Sequence

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