A bidirectional Mendelian randomization study investigating the causal role between gut microbiota and insomnia

Area of Science:

• Microbiome research
• Sleep science
• Genetics

Background:

• Emerging evidence links gut microbiota disturbances to insomnia.
• The causal relationship between gut microbiota and insomnia remains unclear.

Purpose of the Study:

• To investigate the potential causal link between gut microbiota and insomnia using a two-sample Mendelian randomization analysis.
• To identify specific gut bacteria that may influence insomnia risk or protection.

Main Methods:

• Utilized genome-wide association study data for gut microbiota from the MiBioGen consortium and insomnia from the FinnGen consortium.
• Employed two-sample Mendelian randomization analysis to assess causality.
• Analyzed instrumental variable heterogeneity using Cochran's Q statistics.

Main Results:

• The Ruminococcaceae family and Lachnospiraceae genus were associated with an increased risk of insomnia.
• The Flavonifractor and Olsenella genera showed a protective effect against insomnia.
• Reverse Mendelian randomization indicated that insomnia can also alter gut microbiota composition.

Conclusions:

• This Mendelian randomization study provides evidence for a causal relationship between gut microbiota and insomnia.
• Specific gut bacteria identified may serve as potential biomarkers and therapeutic targets for insomnia.
• Findings lay the groundwork for future research on gut microbiota's role in sleep disorders.