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Background The aim of the present study was to evaluate the methylation pattern in the suppressor of cytokine signaling 1 (SOCS1) gene in smokers and non‐smokers with chronic periodontitis (CP). Methods Methylation‐specific polymerase chain reaction (PCR) was performed to determine the methylation status of the SOCS1 promoter in 45 saliva samples from smokers and non‐smokers with CP. Results Cells from the saliva of CP patients who smoked were 7.08 times more likely to have a methylated SOCS1 promoter than cells from the saliva of non‐smoking patients. Conclusions SOCS1 gene promoter methylation, with its potential effects on the expression of this gene, seems to be a consequence of exposure to tobacco and not to periodontal disease. Further studies are needed to elucidate the relationship between the epigenetic control of immune response gene expression, exposure to environmental factors, and the development, progression, and prognosis of CP.

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Failure of oral metronidazole therapy for bacterial vaginosis was not associated with total bacterial count in cervicovaginal fluid.