Causal associations between gut microbiota and rheumatoid arthritis: A two-sample Mendelian randomization study

Area of Science:

• Microbiome research
• Immunology
• Genetics

Background:

• The gut microbiota's role in rheumatoid arthritis (RA) pathogenesis is increasingly recognized.
• However, establishing causal links between specific gut microbes and RA development has been challenging.

Purpose of the Study:

• To investigate the potential causal effects of gut microbial taxa on rheumatoid arthritis (RA) risk using a two-sample Mendelian randomization approach.

Main Methods:

• Utilized summary-level data from the MiBioGen consortium (13,266 individuals) and a large RA genome-wide association study (97,173 individuals).
• Employed multiple Mendelian randomization methods and sensitivity analyses to ensure robust findings.

Main Results:

• Four microbial taxa exhibited nominal associations with RA risk.
• Increased abundance of Catenibacterium, Desulfovibrio, and Ruminiclostridium 6 was associated with higher RA risk.
• Lachnospiraceae (UCG008) showed a potential protective effect against RA.

Conclusions:

• This study provides genetic evidence supporting a potential causal relationship between specific gut microbes and RA risk.
• Findings suggest host immune modulation as a key pathway linking the gut microbiome to RA.
• Identified candidate microbial taxa for further mechanistic and therapeutic investigations in RA.