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Updated: Jun 26, 2025
Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
Published on: January 7, 2014
Systematic genome-wide Mendelian randomization reveals the causal links between miRNAs and Parkinson's disease
Guolin Shi1, Tingting Wu1, Xuetao Li1
1Department of Neurosurgery, The Second Affiliated Hospital of Kunming Medical University, Kunming, Yunnan, China.
Background:
MicroRNAs (miRNAs) have pivotal roles in gene regulation. Circulating miRNAs have been developed as novel candidate non-invasive biomarkers for diagnosis, prognosis, and treatment response for diseases. However, miRNAs that have causal effects on Parkinson's Disease (PD) remain largely unknown. To investigate the causal relationships between miRNAs and PD, here we conduct a Mendelian randomization (MR) study.
Methods:
This study utilized the summary-level data of respective genome-wide association studies (GWAS) for 2083 miRNAs and seven PD-related outcomes to comprehensively reveal the causal associations between the circulating miRNAs and PD. Two-sample MR design was deployed and the causal effects were estimated with inverse variance weighted, MR-Egger, and weighted median. Comprehensively sensitive analyses were followed, including Cochran's Q test, MR-Egger intercept test, MR-PRESSO, and leave-one-out analysis, to validate the robustness of our results. Finally, we investigated the potential role of the MR significant miRNAs by predicting their target genes and functional enrichment analysis.
Results:
Inverse variance weighted estimates suggested that two miRNAs, miR-205-5p (β = -0.46, 95%CI: -0.690 to -0.229, p = 9.3 × 10-5) and miR-6800-5p (β = -0.389, 95%CI: -0.575 to -0.202, p = 4.32 × 10-5), significantly decreased the rate of cognitive decline among PD patients. In addition, eight miRNAs were nominally associated with more than three PD-related outcomes each. No significant heterogeneity of instrumental variables or horizontal pleiotropy was found. Gene Ontology (GO) analysis showed that the targets of these causal miRNAs were significantly enriched in cell cycle, apoptotic, and aging pathways.
Conclusion:
This MR study identified two miRNAs whose genetically regulated expression might have a causal role in the development of PD dementia. Our findings provided potential miRNA biomarkers to make better and early diagnoses and risk assessments of PD.
Insights
This study used Mendelian randomization to identify causal relationships between microRNAs (miRNAs) and Parkinson's Disease (PD). Two specific miRNAs, miR-205-5p and miR-6800-5p, were found to potentially reduce cognitive decline in PD patients.
Area of Science:
- Genetics
- Molecular Biology
- Neuroscience
Background:
- MicroRNAs (miRNAs) regulate gene expression and are emerging as non-invasive biomarkers for disease diagnosis and prognosis.
- The causal role of specific miRNAs in Parkinson's Disease (PD) pathogenesis remains largely unexplored.
- Mendelian randomization (MR) offers a robust approach to investigate potential causal links between genetic factors and diseases.
Purpose of the Study:
- To identify circulating miRNAs with causal effects on Parkinson's Disease (PD) using a comprehensive Mendelian randomization study.
- To explore the potential of these miRNAs as diagnostic or prognostic biomarkers for PD.
- To investigate the functional pathways associated with PD-related miRNAs.
Main Methods:
- Utilized summary-level data from genome-wide association studies (GWAS) for 2083 miRNAs and seven PD-related outcomes.
- Employed a two-sample MR design with inverse variance weighted, MR-Egger, and weighted median methods for causal effect estimation.
- Conducted sensitivity analyses including Cochran's Q test, MR-Egger intercept, MR-PRESSO, and leave-one-out analysis to ensure result robustness.
Main Results:
- Two miRNAs, miR-205-5p and miR-6800-5p, showed a significant inverse association with cognitive decline in PD patients (p < 10^-4).
- Eight additional miRNAs were nominally associated with multiple PD-related outcomes.
- No significant heterogeneity or pleiotropy was detected, and functional enrichment analysis indicated involvement in cell cycle, apoptosis, and aging pathways.
Conclusions:
- Identified two miRNAs with a potential causal role in PD dementia development through genetically regulated expression.
- These findings suggest potential miRNA biomarkers for improved early diagnosis and risk assessment of PD.
- The study highlights the utility of MR in uncovering miRNA-PD causal relationships.
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