Genome-wide association studies (GWAS) have uncovered numerous susceptibility genes for rheumatoid arthritis (RA) in patients of European, Asian and other ethnic ancestries. Although previous transethnic GWAS meta-analyses enabled the identification of several novel loci, the genetic heterogeneity observed in the PADI4 and PTPN22 genes suggests that ethnic variation should be considered. In addition, the effects of genetic polymorphisms on gene expression profiles are important when assessing the association of genetic information with disease pathogenesis and will influence the development of personalized medicine. Gene expression is controlled by epigenetic modifications, which in turn can be affected by environmental stimuli. Altogether, genetic and epigenetic information of Asian populations will contribute considerably to future rheumatology research.