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01.12.2017 | Research article | Ausgabe 1/2017 Open Access

Arthritis Research & Therapy 1/2017

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

Zeitschrift:
Arthritis Research & Therapy > Ausgabe 1/2017
Autoren:
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
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s13075-017-1276-2) contains supplementary material, which is available to authorized users.

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.
Zusatzmaterial
Additional file 1: Supplementary materials include five supplementary figures and a supplementary table. (PDF 440 kb)
13075_2017_1276_MOESM1_ESM.pdf
Literatur
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