The causal relationship between uveitis and psoriatic arthritis: A bidirectional Mendelian randomisation study

Area of Science:

• Ophthalmology
• Rheumatology
• Genetics

Background:

• Observational studies suggest an association between uveitis and psoriatic arthritis (PsA).
• The causal nature of this relationship remains uncertain.
• Investigating the bidirectional link is crucial for understanding disease pathogenesis.

Purpose of the Study:

• To determine if genetically predicted uveitis causally influences the risk of PsA.
• To assess if genetically predicted PsA causally influences the risk of uveitis.
• To explore the bidirectional causal relationship between uveitis and PsA using genetic data.

Main Methods:

• A two-sample bidirectional Mendelian randomization (MR) design was utilized.
• Meta-analysis was performed on data from three distinct sources.
• Sensitivity analyses were conducted to confirm the robustness of the findings.

Main Results:

• MR analysis indicated a positive causal effect of uveitis on PsA (OR = 1.63, P = 0.001).
• Inverse MR analysis revealed a positive causal relationship between PsA and uveitis (OR = 1.55, P = 0.02).
• Findings were consistent across three data sources, supporting a bidirectional association.

Conclusions:

• Uveitis is significantly associated with an increased risk of developing psoriatic arthritis.
• Psoriatic arthritis is associated with an increased risk of developing uveitis.
• These results suggest a potential mutual causal influence between uveitis and PsA.