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Background Mitochondrial dysfunction is a key player in Parkinson’s disease (PD) pathogenesis. Mitochondrial polygenic scores (MGS) may be associated with PD but require validation across diverse populations. Objective To validate the association between the MGS, PD status and age-at-onset (AAO) in idiopathic and LRRK2- PD across various ancestries. Methods We analyzed data from 17,129 PD patients and 13,872 healthy individuals across 10 ancestries within the Global Parkinson’s Disease Genetic Program. We used regression models to assess the association between MGS, PD status and AAO. Results The MGS was associated with iPD in Europeans (β=0.19, SE=0.02, pConclusions The MGS is robustly associated with iPD status in Europeans and Ashkenazi Jews and with LRRK2-PD status. Population-specific MGS are needed to improve accuracy in other ancestries.
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