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Common SNCA Genetic Variants and Parkinson's Disease Risk: A Systematic Review and Meta-Analysis.
Raziyeh Mohammadi1, Mahdi Shirazi2, Sayedeh Fatemeh Sadat-Madani3
1Duke-NUS Medical School, National University of Singapore, Singapore 169857, Singapore.
The SNCA gene
Area of Science:
- Neurogenetics
- Molecular Biology
- Epidemiology
Background:
- The SNCA gene, encoding alpha-synuclein, is a key factor in Parkinson's disease (PD) pathogenesis.
- Specific single-nucleotide polymorphisms (SNPs) within SNCA are associated with increased PD risk.
- Understanding these genetic associations is crucial for elucidating PD etiology.
Purpose of the Study:
- To systematically evaluate the association between common SNCA gene polymorphisms and Parkinson's disease risk.
- To perform a comprehensive meta-analysis of existing cohort and case-control studies.
- To identify robust genetic risk variants for Parkinson's disease.
Main Methods:
- Meta-analysis of 27 cohort and case-control studies published before November 20, 2023.
- Searches conducted in PubMed, Scopus, and Web of Science.
- Pooled odds ratios calculated under allelic, dominant, and recessive models; heterogeneity and publication bias assessed.
Main Results:
- SNP rs11931074 consistently associated with PD risk across all models with low heterogeneity.
- SNPs rs356219 and rs356165 also showed significant associations, though regional differences caused heterogeneity.
- SNP rs2583988 demonstrated marginal significance in the allelic model, but this was not robust in sensitivity analyses.
Conclusions:
- SNP rs11931074 is confirmed as a robust genetic risk variant for Parkinson's disease.
- SNPs rs356219 and rs356165 are supported as PD risk factors.
- Further large, multi-ethnic studies are needed to clarify mechanisms and advance precision medicine for PD.
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