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Published in: Arthritis Research & Therapy 1/2017

Open Access 01-12-2017 | Research article

DNA methylation mediates genotype and smoking interaction in the development of anti-citrullinated peptide antibody-positive rheumatoid arthritis

Authors: Weida Meng, Zaihua Zhu, Xia Jiang, Chun Lai Too, Steffen Uebe, Maja Jagodic, Ingrid Kockum, Shahnaz Murad, Luigi Ferrucci, Lars Alfredsson, Hejian Zou, Lars Klareskog, Andrew P. Feinberg, Tomas J. Ekström, Leonid Padyukov, Yun Liu

Published in: Arthritis Research & Therapy | Issue 1/2017

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Abstract

Background

Multiple factors, including interactions between genetic and environmental risks, are important in susceptibility to rheumatoid arthritis (RA). However, the underlying mechanism is not fully understood. This study was undertaken to evaluate whether DNA methylation can mediate the interaction between genotype and smoking in the development of anti-citrullinated peptide antibody (ACPA)-positive RA.

Methods

We investigated the gene-smoking interactions in DNA methylation using 393 individuals from the Epidemiological Investigation of Rheumatoid Arthritis (EIRA). The interaction between rs6933349 and smoking in the risk of developing ACPA-positive RA was further evaluated in a larger portion of the EIRA (1119 controls and 944 ACPA-positive patients with RA), and in the Malaysian Epidemiological Investigation of Rheumatoid Arthritis (MyEIRA) (1556 controls and 792 ACPA-positive patients with RA). Finally, mediation analysis was performed to investigate whether DNA methylation of cg21325723 mediates this gene-environment interaction on the risk of developing of ACPA-positive RA.

Results

We identified and replicated one significant gene-environment interaction between rs6933349 and smoking in DNA methylation of cg21325723. This gene-smoking interaction is a novel interaction in the risk of developing ACPA-positive in both Caucasian (multiplicative P value = 0.056; additive P value = 0.016) and Asian populations (multiplicative P value = 0.035; additive P value = 0.00027), and it is mediated through DNA methylation of cg21325723.

Conclusions

We showed that DNA methylation of cg21325723 can mediate the gene-environment interaction between rs6933349 and smoking, impacting the risk of developing ACPA-positive RA, thus being a potential regulator that integrates both internal genetic and external environmental risk factors.
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Metadata
Title
DNA methylation mediates genotype and smoking interaction in the development of anti-citrullinated peptide antibody-positive rheumatoid arthritis
Authors
Weida Meng
Zaihua Zhu
Xia Jiang
Chun Lai Too
Steffen Uebe
Maja Jagodic
Ingrid Kockum
Shahnaz Murad
Luigi Ferrucci
Lars Alfredsson
Hejian Zou
Lars Klareskog
Andrew P. Feinberg
Tomas J. Ekström
Leonid Padyukov
Yun Liu
Publication date
01-12-2017
Publisher
BioMed Central
Published in
Arthritis Research & Therapy / Issue 1/2017
Electronic ISSN: 1478-6362
DOI
https://doi.org/10.1186/s13075-017-1276-2

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