Human leukocyte antigen-G polymorphisms in periodontitis

Area of Science:

• Genetics
• Immunology
• Periodontology

Background:

• Periodontitis is a complex inflammatory disease affecting the gums and supporting structures of teeth.
• Human leucocyte antigen-G (HLA-G) is an immune tolerance molecule with potential roles in various inflammatory and autoimmune conditions.
• Genetic polymorphisms in HLA-G may influence susceptibility to or protection against diseases like periodontitis.

Purpose of the Study:

• To investigate the association between specific human leucocyte antigen-G (HLA-G) gene polymorphisms and periodontitis.
• To compare the frequencies of HLA-G polymorphisms in patients with chronic periodontitis, aggressive periodontitis, and healthy controls.

Main Methods:

• Analysis of a 14 bp insertion/deletion polymorphism and a C>G single nucleotide polymorphism (SNP) at position +3142 in the 3' untranslated region of the HLA-G gene.
• Genotyping was performed on 62 patients with chronic periodontitis, 24 with aggressive periodontitis, and 47 healthy controls.
• Statistical analysis included Hardy-Weinberg equilibrium testing and comparison of allele and genotype frequencies between groups.

Main Results:

• A significant deviation from Hardy-Weinberg expectations was observed for the 14 bp insertion/deletion polymorphism in the chronic periodontitis group.
• The frequency of homozygotes for the 14 bp deletion allele was significantly higher in chronic periodontitis patients compared to healthy controls.
• No significant differences in the +3142 C>G SNP or its haplotypes were found between periodontitis patients and controls.

Conclusions:

• The 14 bp deletion polymorphism in the HLA-G gene is associated with an increased risk of developing chronic periodontitis.
• This specific HLA-G polymorphism may play a role in the pathogenesis of chronic periodontitis, potentially influencing immune responses.
• The +3142 C>G SNP and its haplotypes do not appear to be associated with periodontitis susceptibility in the studied population.