Causal relationships between gut microbiota and hypothyroidism: a Mendelian randomization study

Area of Science:

• Microbiome Research
• Endocrinology
• Genetics

Background:

• The gut microbiota is crucial for maintaining thyroid homeostasis.
• Causal relationships between gut microbiota and hypothyroidism require further investigation.

Approach:

• Utilized a two-sample Mendelian randomization (MR) design.
• Analyzed genome-wide association study (GWAS) data from the MiBioGen consortium for 211 gut microbiota taxa.
• Employed hypothyroidism data from the FinnGen and UK Biobank consortia, including large case and control groups.

Key Points:

• Increased levels of Intestinimonas and Ruminiclostridium5 were associated with higher hypothyroidism risk.
• Elevated levels of Butyrivibrio, Eggerthella, Lachnospiraceae UCG008, Ruminococcaceae UCG011, and Actinobacteria were linked to lower hypothyroidism risk.
• Eggerthella and Ruminiclostridium5 showed consistent causal associations with hypothyroidism across datasets, supported by robust sensitivity analyses.

Conclusions:

• Specific gut microbiota compositions significantly impact hypothyroidism.
• Targeting gut microbiota modulation presents a promising avenue for future hypothyroidism interventions.