Uncovering a Causal Connection between Gut Microbiota and Six Thyroid Diseases: A Two-Sample Mendelian Randomization...

Area of Science:

• Microbiome research
• Genetics
• Endocrinology

Background:

• Emerging evidence links gut microbiota (GM) to thyroid diseases (TDs).
• Causal relationships between GM and TDs remain unclear.
• Understanding these links is crucial for thyroid disease management.

Purpose of the Study:

• To investigate the causal relationship between GM and six types of TDs.
• Utilize Mendelian randomization (MR) to assess genetic links.
• Identify specific microbial taxa associated with thyroid disease risk.

Main Methods:

• Two-sample Mendelian randomization (MR) analysis.
• Utilized genome-wide association study (GWAS) data from MiBioGen and FinnGen.
• Examined GM as exposure and six TDs as outcomes.

Main Results:

• Identified 32 microbial taxa associated with the risk of six TDs.
• Specific bacteria showed protective or risk-increasing effects for nontoxic diffuse goiter, nontoxic multinodular goiter, nontoxic single thyroid nodule, Graves' disease, Plummer disease, and toxic single thyroid nodule.
• Highlighted distinct microbial signatures for different thyroid conditions.

Conclusions:

• Findings support a genetically determined causal link between specific gut microbes and thyroid diseases.
• Establishes a foundation for exploring underlying mechanisms.
• Suggests potential for novel therapeutic targets in thyroid disease treatment.