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Interferon-gamma +874A/T polymorphism is associated with asthma risk: a meta-analysis
This meta-analysis found that the interferon-gamma (IFN-γ) +874A/T polymorphism is a significant risk factor for asthma susceptibility. The association was consistent across ethnic groups, strengthening evidence for its role in asthma development.
Area of Science:
- Genetics
- Immunology
- Respiratory Medicine
Background:
- The link between the interferon-gamma (IFN-γ) +874A/T polymorphism and asthma risk has been unclear.
- Previous studies yielded controversial and ambiguous results regarding this association.
Purpose of the Study:
- To precisely determine the relationship between the IFN-γ +874A/T polymorphism and asthma risk.
- To conduct a comprehensive meta-analysis to clarify existing discrepancies.
Main Methods:
- A systematic literature search was performed across five major databases (PubMed, EMBASE, Wanfang, CNKI, Weipu).
- Odds Ratios (ORs) with 95% Confidence Intervals (CIs) were calculated to quantify the strength of association.
- Ten case-control studies comprising 697 cases and 1049 controls were included in the meta-analysis.
Main Results:
- A significant association was observed between the IFN-γ +874A/T polymorphism and increased asthma susceptibility (AA vs AT + TT: OR=1.89, 95% CI=1.37-2.62, P=.0001).
- Subgroup analyses revealed significant associations in both white (OR=1.42, 95% CI=1.04-1.93, P=.03) and Asian populations (OR=2.52, 95% CI=1.49-4.25, P=.0006).
- Sensitivity and cumulative meta-analyses confirmed the robustness of the findings, with no evidence of publication bias.
Conclusions:
- The interferon-gamma +874A/T polymorphism is identified as a risk factor for asthma.
- This meta-analysis provides robust evidence supporting the role of this genetic polymorphism in asthma development across different ethnicities.
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