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Tumor necrosis factor-alpha gene polymorphisms in relation to periodontitis
Jeroen Craandijk1, Michiel V van Krugten, Cor L Verweij
1Department of Periodontology, Academic Center for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands.
Journal of Clinical Periodontology
|February 16, 2002
Summary
Genetic variations in the Tumor Necrosis Factor-alpha (TNF-alpha) gene were not linked to periodontitis susceptibility or severity. These findings suggest TNF-alpha polymorphisms do not influence destructive periodontal disease risk or progression.
Area of Science:
- Genetics
- Periodontology
- Immunology
Background:
- Genetic polymorphisms in cytokines are investigated as potential markers for destructive periodontal disease.
- Tumor Necrosis Factor-alpha (TNF-alpha) is a key cytokine implicated in inflammatory processes.
Purpose of the Study:
- To investigate four bi-allelic polymorphisms in the TNF-alpha gene (at positions -376, -308, -238 in the promoter, and +489 in the first intron).
- To determine the association of these TNF-alpha polymorphisms with susceptibility to and severity of periodontitis.
Main Methods:
- Genotyping of 90 periodontitis patients and 264 control subjects for four TNF-alpha polymorphisms.
- Analysis of genotype and allele frequencies, comparing severe and moderate periodontitis patients.
- Comparison of bone loss patterns between patients with and without the TNF-alpha A allele.
Main Results:
- No significant differences in genotype or allele frequencies of the studied TNF-alpha polymorphisms were found between periodontitis patients and controls.
- The distribution of genotypes did not differ between severe and moderate periodontitis cases.
- No significant association was observed between TNF-alpha genotypes and the extent of bone loss, nor was smoking status a confounding factor.
Conclusions:
- The investigated genetic polymorphisms in the TNF-alpha gene (-376, -308, -238, and +489) are not identified as susceptibility or severity factors for periodontitis.
- These findings indicate that TNF-alpha gene variations do not play a significant role in the development or progression of periodontitis, independent of smoking status.