The Causal Relationship between Immune-Mediated Inflammatory Diseases and Aortic Aneurysm: A Bidirectional Two-Sample...

Area of Science:

• Genetics
• Immunology
• Epidemiology

Background:

• Adiposity (AA) is a growing public health concern with complex links to various diseases.
• Understanding the causal relationship between adiposity and autoimmune conditions is crucial for developing effective interventions.

Purpose of the Study:

• To investigate the potential causal effect of genetically predicted adiposity (AA) on rheumatoid arthritis (RA) and other autoimmune diseases using Mendelian randomization (MR).

Main Methods:

• Utilized genome-wide association study (GWAS) data from European ancestry populations.
• Employed MR principles to identify genetic variants as instrumental variables.
• Applied the inverse variance weighted (IVW) method as the primary analytical approach for causal inference.

Main Results:

• Found a significant causal association between genetically predicted adiposity (AA) and an increased risk of rheumatoid arthritis (RA).
• No significant causal effects were observed for adiposity on inflammatory bowel disease (IBD), Crohn's disease (CD), ulcerative colitis (UC), systemic lupus erythematosus (SLE), or psoriasis (PSO).
• Sensitivity analyses confirmed the robustness of the findings, ruling out heterogeneity and horizontal pleiotropy.

Conclusions:

• Genetically predicted adiposity (AA) causally influences the risk of developing rheumatoid arthritis (RA).
• Human leukocyte antigen (HLA) genetic markers may hold potential for personalized treatment and prevention strategies for RA.
• Further research could explore the specific mechanisms linking adiposity and RA pathogenesis.