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Causal relationship between gut microflora and dementia: a Mendelian randomization study
Jinjie Fu1,2, Yuan Qin3,4, Lingyong Xiao3,4
1Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, China.
Frontiers in Microbiology
|January 30, 2024
Summary
This study confirms a causal link between gut microflora (GM) and dementia. Specific gut bacteria influence dementia risk, offering new avenues for prevention and treatment.
Area of Science:
- Neuroscience
- Microbiology
- Genetics
Background:
- Emerging evidence suggests a link between gut microflora (GM) and dementia.
- A definitive causal relationship between GM and dementia subtypes remains unclear.
Purpose of the Study:
- To investigate the causal association between GM and dementia, including its subtypes.
- Utilize Mendelian randomization to explore gut microbiota's role in dementia etiology.
Main Methods:
- Employed a two-sample Mendelian randomization (TSMR) analysis using Genome-Wide Association Study (GWAS) data.
- Applied inverse-variance weighted (IVW) method, MR-Egger, weighted median, simple mode, and weighted mode.
- Conducted sensitivity analyses including Cochrane's Q test, MR-Egger intercept, MR-PRESSO, and leave-one-out.
Main Results:
- Identified 21 gut microflora (GM) significantly associated with dementia, Alzheimer's disease, vascular dementia, Lewy body dementia, and Parkinson's disease.
- All identified associations passed rigorous sensitivity tests, confirming robustness.
Conclusions:
- Established a causal relationship between specific gut microflora and dementia risk.
- Identified GM linked to increased or decreased dementia risk, informing novel interventions.
- Provided new insights for dementia prevention, diagnosis, and treatment strategies targeting the gut microbiota.
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