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BackgroundResearch findings indicate a putative indirect or latent association between phenylalanine (Phe) and Parkinson's disease (PD). In this study, we aimed to analyze the causal relationship between Phe and PD by two sample Mendelian randomization (MR) analysis.MethodsIn this study, the PD-related dataset and Phe-related dataset were downloaded from Integrative Epidemiology U1nit (IEU) Open Genome-Wide Association Study (GWAS) database. Four algorithms (MR Egger, maximum likelihood, inverse variance weighting (IVW) and unweighted regression) were used to perform MR analysis. The sensitivity analysis (heterogeneity test, horizontal pleiotropy test and Leave-One-Out (LOO) analysis) was used to assess the reliability of MR analyses.ResultsIn the forward MR analysis, Phe was a safety factor for PD (p-value p-value > 0.05). In addition, sensitivity analysis showed that MR analysis was reliable.ConclusionThe results of this study revealed that Phe was a safety factor for PD, meaning that Phe reduced the risk of PD.
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