Plazma Kafein Seviyeleri ve Alzheimer Hastalığı ve Parkinson Hastalığı Riski: Mendel Randomizasyon Çalışması.

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We leveraged genetic variants associated with caffeine metabolism in the two-sample Mendelian randomization framework to investigate the effect of plasma caffeine levels on the risk of Alzheimer's disease and Parkinson's disease. Genetic association estimates for the outcomes were obtained from the International Genomics of Alzheimer's Project, the International Parkinson's Disease Genomics consortium, the FinnGen consortium, and the UK Biobank. Genetically predicted higher plasma caffeine levels were associated with a non-significant lower risk of Alzheimer's disease (odds ratio 0.87; 95% confidence interval 0.76, 1.00; p = 0.056). A suggestive association was observed for genetically predicted higher plasma caffeine levels and lower risk of Parkinson's disease in the FinnGen consortium. but not in the International Parkinson's Disease Genomics consortium; no overall association was found (odds ratio 0.92; 95% confidence interval 0.77, 1.10; p = 0.347). This study found possible suggestive evidence of a protective role of caffeine in Alzheimer's disease. The association between caffeine and Parkinson's disease requires further study.

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