DEFB4A Promoter Polymorphism Is Associated with Chronic Periodontitis: A Case-Control Study

Area of Science:

• Genetics
• Oral Biology
• Immunology

Background:

• Human beta-defensin-2 (HBD-2) is an antimicrobial peptide crucial for oral cavity defense.
• Inter-individual variations in HBD-2 expression, influenced by genetics, may impact disease susceptibility.
• Chronic periodontitis (CP) is a prevalent oral infection with potential links to host genetic factors.

Purpose of the Study:

• To investigate the association between genetic variations in the human beta-defensin-2 gene (DEFB4A) and the risk of developing chronic periodontitis (CP).
• To explore the relationship between DEFB4A gene polymorphisms and clinical parameters of periodontal disease, such as clinical attachment level (CAL) and tooth loss.

Main Methods:

• A case-control study was conducted involving 200 unrelated individuals.
• Sanger sequencing was employed to analyze two promoter polymorphisms (rs1339258595 and rs3762040) in the DEFB4A gene.
• Statistical analyses were performed to assess the association between genotypes, alleles, diplotypes, and CP risk, CAL, and tooth loss.

Main Results:

• The DEFB4A rs1339258595 promoter polymorphism was significantly associated with CP risk and CAL.
• Carriers of the T allele for rs1339258595 showed a reduced likelihood of developing periodontitis (OR=0.35, p=0.0004) and had lower CAL.
• The wild-type GGGG diplotype for DEFB4A was linked to a higher risk of tooth loss compared to other diplotypes (p=0.016).

Conclusions:

• Genetic variations within the DEFB4A promoter region play a role in modulating host resistance to periodontal infections.
• The DEFB4A rs1339258595 polymorphism may serve as a potential genetic marker for predicting CP risk and disease severity.
• Further research into DEFB4A's role could lead to novel strategies for CP prevention and management.