Association between TLR2/TLR4 gene polymorphisms and COPD phenotype in a Greek cohort.

Area of Science:

• Immunogenetics
• Pulmonology
• Molecular Biology

Background:

• The innate immune system is crucial in chronic obstructive pulmonary disease (COPD) pathogenesis.
• Functional single-nucleotide polymorphisms (SNPs) in innate immune genes may influence COPD phenotype and prognosis.

Purpose of the Study:

• To investigate the role of Toll-like receptor 2 (TLR2) and Toll-like receptor 4 (TLR4) SNPs and mannose-binding lectin (MBL) deficiency in Greek COPD patients.
• To assess the combined effects of these genetic factors on COPD severity.

Main Methods:

• Genotyping of functional TLR2 and TLR4 SNPs (TLR2-R753Q, TLR4-D299G, TLR4-T399I).
• Assessment of genotypic mannose-binding lectin (MBL) deficiency.
• Analysis of genetic associations with COPD stage and exacerbation frequency in 114 Greek COPD patients.

Main Results:

• TLR4-D299G and TLR4-T399I SNPs were associated with an earlier stage of COPD (p=0.003 and p=0.009).
• Absence of analyzed polymorphisms, including TLR2-R753Q and MBL deficiency, correlated with more severe COPD phenotypes and increased exacerbations (p=0.045).

Conclusions:

• Presence of functional innate immune SNPs, such as TLR polymorphisms and MBL deficiency, may offer a protective effect on COPD phenotype.
• These findings suggest a potential role for immunogenetics in modulating COPD severity and outcomes.