Causal relationship between gut microbiota and Behçet's disease: a Mendelian randomization study

Area of Science:

• Microbiome research
• Human genetics
• Immunology

Background:

• Observational studies suggest a link between gut microbiota and Behçet's disease (BD).
• The causal relationship between gut microbiota and BD remains unclear.
• Understanding this relationship is crucial for developing targeted therapies.

Purpose of the Study:

• To establish a causal relationship between gut microbiota and Behçet's disease (BD) using Mendelian randomization.
• To identify specific gut microbial taxa that influence BD risk.
• To explore potential microbial biomarkers for BD.

Main Methods:

• Utilized Genome-Wide Association Studies (GWAS) data from the MiBioGen consortium for gut microbiome and UK Biobank for BD.
• Employed Mendelian randomization (MR) with inverse variance weighted (IVW) as the primary method.
• Validated results using weighted median, MR-Egger, simple mode, and weighted mode methods, alongside sensitivity analyses (leave-one-out, heterogeneity, pleiotropy tests).

Main Results:

• The genus Parasutterella, Lachnospiraceae NC2004 group, Turicibacter, and Erysipelatoclostridium were identified as protective factors against BD.
• The genus Intestinibacter was suggested as a potential risk factor for BD.
• Sensitivity analyses confirmed the robustness of the findings.

Conclusions:

• This study provides evidence for a causal relationship between specific gut microbiota and Behçet's disease (BD).
• Identified microbial taxa may serve as novel biomarkers for BD.
• These findings offer potential new targets for the prevention and treatment of BD.