Methylation quantitative trait locus analysis of osteoarthritis links epigenetics with genetic risk.

Abstract:

:Osteoarthritis (OA) is a common, painful and debilitating disease of articulating joints resulting from the age-associated loss of cartilage. Well-powered genetic studies have identified a number of DNA polymorphisms that are associated with OA susceptibility. Like most complex trait loci, these OA loci are thought to influence disease susceptibility through the regulation of gene expression, so-called expression quantitative loci, or eQTLs. One mechanism through which eQTLs act is epigenetic, by modulating DNA methylation. In such cases, there are quantitative differences in DNA methylation between the two alleles of the causal polymorphism, with the association signal referred to as a methylation quantitative trait locus, or meQTL. In this study, we aimed to investigate whether the OA susceptibility loci identified to date are functioning as meQTLs by integrating genotype data with whole genome methylation data of cartilage DNA. We investigated potential genotype-methylation correlations within a 1.0-1.5 Mb region surrounding each of 16 OA-associated single-nucleotide polymorphisms (SNPs) in 99 cartilage samples and identified four that function as meQTLs. Three of these replicated in an additional cohort of up to 62 OA patients. These observations suggest that OA susceptibility loci regulate the level of DNA methylation in cis and provide a mechanistic explanation as to how these loci impact upon OA susceptibility, further increasing our understanding of the role of genetics and epigenetics in this common disease.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Rushton MD,Reynard LN,Young DA,Shepherd C,Aubourg G,Gee F,Darlay R,Deehan D,Cordell HJ,Loughlin J

doi

10.1093/hmg/ddv433

subject

Has Abstract

pub_date

2015-12-20 00:00:00

pages

7432-44

issue

25

eissn

0964-6906

issn

1460-2083

pii

ddv433

journal_volume

24

pub_type

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