Causal relationship between gut microbiota and myasthenia gravis: a two-sample Mendelian randomization study

Area of Science:

• Genetics
• Microbiology
• Immunology

Background:

• Observational studies suggest a link between gut microbiota and myasthenia gravis (MG).
• The causal relationship between gut microbiota and MG remains largely unexplored.
• This study aimed to investigate the potential causal link between gut microbiota composition and MG.

Purpose of the Study:

• To determine if specific gut microbiota taxa causally influence the risk of developing myasthenia gravis.
• To explore potential protective or risk-associated microbial communities in the gut related to MG.
• To provide a foundation for novel therapeutic strategies targeting the gut microbiome for MG management.

Main Methods:

• Utilized Mendelian randomization (MR) analysis with summary statistics from large genome-wide association studies (GWAS) for MG.
• Analyzed data for 211 gut microbiota taxa, employing inverse variance-weighted (IVW), MR-Egger, weighted median, and weighted mode methods.
• Conducted sensitivity analyses to ensure result robustness and performed reverse MR analysis to assess reverse causality.

Main Results:

• Identified seven suggestive causal associations between gut microbiota and MG.
• Phylum Actinobacteria, class Gammaproteobacteria, and families Defluviitaleaceae, Family XIII, and Peptococcaceae showed protective effects against MG.
• Order Mollicutes RF9 and genus Faecalibacterium were identified as suggestive risk factors for MG; no significant heterogeneity or pleiotropy was detected.

Conclusions:

• The MR analysis supports a suggestive causal relationship between gut microbiota and myasthenia gravis.
• Findings highlight specific microbial taxa that may play protective or risk-modulating roles in MG pathogenesis.
• Further research, including randomized controlled trials, is warranted to confirm these findings and explore therapeutic potential.