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• W4292451777 endingPage "2074" @default.
• W4292451777 startingPage "2066" @default.
• W4292451777 abstract "α-Synuclein pathology is associated with neuronal degeneration in Parkinson's disease (PD) and considered to sequentially spread across the brain (Braak stages). According to a new hypothesis of distinct α-synuclein spreading directions based on the initial site of pathology, the brain-first spreading subtype would be associated with a more asymmetric cerebral and nigrostriatal pathology than the body-first subtype.Here, we tested if proposed markers of brain-first PD (ie, higher dopamine transporter [DaT] asymmetry; absence of rapid eye movement sleep behavior disorder [RBD]) are associated with a greater or more asymmetric reduction in gray matter volume (GMV) in comparison to body-first PD.Data of 255 de novo PD patients and 110 healthy controls (HCs) were retrieved from the Parkinson's Progression Markers Initiative. Structural magnetic resonance images were preprocessed, and GMVs and their hemispherical asymmetry were obtained for each of the neuropathologically defined Braak stages. Group and correlation comparisons were performed to assess differences in GMV and GMV asymmetry between PD subtypes.PD patients demonstrated significantly smaller bilateral GMVs compared to HCs, in a pattern denoting stage-dependent disease-related brain atrophy. However, the degree of putaminal DaT asymmetry was not associated with reduced GMV or higher GMV asymmetry. Furthermore, RBD-negative and RBD-positive patients did not demonstrate a significant difference in GMV or GMV asymmetry.Our findings suggest that putative brain-first and body-first patients do not present diverging brain atrophy patterns. Although certainly not disproving the brain-first/body-first spreading hypothesis, this study fails to provide evidence in support of it. © 2022 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson and Movement Disorder Society." @default.
• W4292451777 created "2022-08-20" @default.
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• W4292451777 date "2022-08-09" @default.
• W4292451777 modified "2023-10-12" @default.
• W4292451777 title "Gray Matter Volume Loss in Proposed <scp>Brain‐First</scp> and <scp>Body‐First</scp> Parkinson's Disease Subtypes" @default.
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• W4292451777 doi "https://doi.org/10.1002/mds.29172" @default.
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