Abstract
Parkinson’s disease (PD) urgently requires blood-based markers that flag pathology before disabling motor decline. This study measured absolute concentrations of 144 plasma metabolites in 20 neurologically healthy adults and in 40 PD patients clinically classified as intermediate (PD-I) or progressive (PD-II). A multinomial logistic regression model was built to examine how changes in metabolite concentrations relate to disease stage and to assess their exploratory discriminative performance in this cohort. Five metabolites: glutamine, butyric acid, indoleacetic acid, phosphatidylcholine aa C40:2, and acylcarnitine C12:1 emerged as the smallest biomarker set that consistently separated controls, PD-I, and PD-II. When three non-motor manifestations often present in the prodromal phase (drooling, REM behavior disorder and depression) were added, the combined profile clearly distinguished controls from early-stage patients and improved classification of intermediate versus progressive disease. The selected metabolites play roles in gut-derived signaling, mitochondrial \(\beta\)-oxidation, and membrane lipid homeostasis, while the clinical variables mirror the recognized early spread of \(\alpha\)-synuclein pathology, together offering a coherent snapshot of systemic changes across PD progression. Because the panel can be quantified from a single small plasma aliquot and a brief clinical interview, it represents a promising exploratory finding that requires validation in larger, independent cohorts before any consideration for clinical application or pre-symptomatic screening.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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JJOV thanks the financial support from the UNAM Postdoctoral Program DGAPA.
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This research was funded by Secretaría de Ciencia, Humanidades, Tecnología e Innovación ((64382 and CF-2023-I-1226)); INMEGEN internal funds (Basal 2025); Secretaría de Salud (FPIS2024-INMEGEN-6940); Genome Alberta (a division of Genome Canada) (grant number TMIC MC4); The Canadian Institutes of Health Research (CIHR) (grant number FS 148461); and The Canada Foundation for Innovation (CFI) (grant number MSIF 35456).
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Conceptualization was undertaken by José Pedro Elizalde-Díaz, Yamilé López-Hernández, Juan José Oropeza Valdez, and Eduardo Martínez Martínez; Methodology by Juan José Oropeza Valdez, Yamilé López-Hernández, Osbaldo Resendis Antonio, Rupasri Mandal, and José Pedro Elizalde-Díaz; Investigation by Juan José Oropeza Valdez, José Pedro Elizalde-Díaz, Jaquelin Leyva Hernández, Laura Adalid-Peralta, and Mayela Rodríguez-Violante; Data Curation by Juan José Oropeza Valdez and José Pedro Elizalde-Díaz; Formal Analysis by Juan José Oropeza Valdez, Osbaldo Resendis Antonio, and Rupasri Mandal; Software and Validation by Rupasri Mandal; Visualization by Juan José Oropeza Valdez and Osbaldo Resendis Antonio; Resources/Clinical Investigation by Mayela Rodríguez-Violante and Laura Adalid-Peralta; Writing – Original Draft by Juan José Oropeza Valdez and Yamilé López-Hernández; Writing – Review & Editing by all authors; Supervision by Yamilé López-Hernández, Eduardo Martínez Martínez, and David S. Wishart; Project Administration by Yamilé López-Hernández, David S. Wishart, and Eduardo Martínez Martínez; and Funding Acquisition by David S. Wishart, Yamilé López-Hernández, and Eduardo Martínez Martínez.
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Oropeza Valdez, J.J., Elizalde-Díaz, J.P., Antonio, O.R. et al. Association of a five-metabolite and early-symptom profile with Parkinson’s disease and its clinical progression. Sci Rep (2026). https://doi.org/10.1038/s41598-026-36756-z
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DOI: https://doi.org/10.1038/s41598-026-36756-z


