Abstract
Objectives: Periodontitis is an infectious disorder that leads to irreversible loss of the surrounding attachment and bone destruction. Genetic polymorphism of cytokines has been sug-gested to play a role in periodontitis. This case-control study aimed to investigate the relationship between periodontitis and two single nucleotide polymorphisms (SNPs): rs1800629 (-308 G/A) and rs1799964 (-1031 T/C), in the TNF-a gene promoter area.Materials and methods: Peripheral blood was used to prepare genomic DNA from 60 subjects with stage II to stage III periodontitis, as along with 65 control subjects. Polymerase chain reaction and restriction endonuclease digestion were used to genotype TNF-a SNPs.Results: The distribution of both genotypes and alleles of TNF-a (-308 G/A) polymorphism did not vary between periodontitis subjects and the controls (P > 0.05). However, the CT genotype and C allele of the TNF-a (-1031 T/C) polymorphism were observed more frequently in the periodon-titis subjects than in the controls, while the TT genotype and the T allele were more predominant in the control subjects than in the periodontitis patients (OR: 3.149; 95% CI: 1.494-6.639; P = 0.002 and OR: 2.933; 95% CI: 1.413-6.090; P = 0.003, sequentially).Conclusion: The TNF-a (-308 G/A) polymorphism potentially has no correlation with periodon-titis susceptibility, whereas the TNF-a (-1031) CT genotype and C allele might be related to peri-odontitis among Saudi subjects.(c) 2022 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).