Association between miRNA polymorphisms and rheumatoid arthritis susceptibility: a meta-analysis

Area of Science:

• Genetics
• Immunology
• Molecular Biology

Background:

• Rheumatoid arthritis (RA) is an autoimmune disease with a complex genetic component.
• MicroRNAs (miRNAs) are small non-coding RNAs that play crucial roles in gene regulation and have been implicated in various diseases, including RA.
• Genetic variations in miRNA genes (polymorphisms) may influence miRNA function and contribute to disease susceptibility.

Purpose of the Study:

• To conduct a meta-analysis evaluating the association between specific miRNA polymorphisms and rheumatoid arthritis (RA) susceptibility.
• To identify which miRNA polymorphisms are significantly associated with RA risk or protection.

Main Methods:

• Systematic literature search of MEDLINE, EMBASE, and Web of Science for relevant case-control studies.
• Inclusion of studies examining five specific miRNA polymorphisms: miR-146a rs2910164, miR-499 rs3746444, miR-196a2 rs11614913, miR-155 rs767649, and miR-149 rs2292832.
• Calculation of odds ratios (ORs) with 95% confidence intervals (CIs) using random-effects models to assess the strength of associations.

Main Results:

• Twenty-three studies with 4,303 RA patients and 5,337 controls were analyzed.
• MiR-499 rs3746444 was significantly associated with increased RA risk across multiple genetic models.
• MiR-146a rs2910164 showed protective effects in Arab populations but not in Asian or European populations.
• MiR-149 rs2292832 exhibited strong protective effects against RA.
• No significant associations were found for miR-196a2 rs11614913 or miR-155 rs767649.

Conclusions:

• MiRNA polymorphisms display heterogeneous associations with RA susceptibility.
• MiR-499 rs3746444 is a risk factor for RA, whereas miR-146a rs2910164 and miR-149 rs2292832 are protective.
• The protective effect of miR-146a rs2910164 is population-specific, highlighting the importance of ethnic background in genetic association studies of RA.