DNMT3B and systemic lupus erythematosus: In our study, we observed that individuals with periodontitis, SLE and inactive SLE + periodontitis showed a higher frequency of the T allele and the TT genotype for DNMT3B. The data on periodontitis confirm our previously results22 and for the first time we show an association between rs2424913 polymorphism and SLE and SLE concomitant with periodontitis.