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Longitudinal brain connectivity changes and clinical evolution in Parkinson’s disease

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Abstract

Longitudinal connectivity studies might guide our understanding of the underlying neurodegenerative processes. We report the results of a longitudinal study in patients at different stages of Parkinson’s disease (PD), who performed motor and non-motor evaluations and serial resting state (RS) functional MRI (fMRI). Cluster analysis was applied to demographic and clinical data of 146 PD patients to define disease subtypes. Brain network functional alterations were assessed at baseline in PD relative to 60 healthy controls and every year for a maximum of 4 years in PD groups. Progression of brain network changes were compared between patient clusters using RS fMRI. The contribution of network changes in predicting clinical deterioration was explored. Two main PD clusters were identified: mild PD (86 patients) and moderate-to-severe PD (60 patients), with the latter group being older and having earlier onset, longer PD duration, more severe motor, non-motor and cognitive deficits. Within the mild patient cluster, two clinical subtypes were further identified: mild motor-predominant (43) and mild-diffuse (43), with the latter being older and having more frequent non-motor symptoms. Longitudinal functional connectivity changes vary across patients in different disease stages with the coexistence of hypo- and hyper-connectivity in all subtypes. RS fMRI changes were associated with motor, cognitive and non-motor evolution in PD patients. Baseline RS fMRI presaged clinical and cognitive evolution. Our network perspective was able to define trajectories of functional architecture changes according to PD stages and prognosis. RS fMRI may be an early biomarker of PD motor and non-motor progression.

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Fig. 1: Functional connectivity changes over time in moderate-to-severe vs mild PD subtypes.
Fig. 2: Functional connectivity changes over time in mild-diffuse vs mild motor-predominant PD subtypes.

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Acknowledgements

The authors thank the patients and their families for the time and effort they dedicated to the research, and Dr. Homa Zahedmanesh, Dr. Marta Gandolla and Prof. Alessandra Pedrocchi from Politecnico di Milano, Italy for the fruitful discussion.

Funding

Ministry of Education, Science, and Technological Development of the Republic of Serbia (project #175090).

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M.F. is Editor-in-Chief of the Journal of Neurology; received compensation for consulting services and/or speaking activities from Biogen Idec, Merck-Serono, Novartis, Teva Pharmaceutical Industries; and receives research support from Biogen Idec, Merck-Serono, Novartis, Teva Pharmaceutical Industries, Roche, Italian Ministry of Health, Fondazione Italiana Sclerosi Multipla, and ARiSLA (Fondazione Italiana di Ricerca per la SLA). S.B., E.S., I.S., A.F., A.T., N.P. and V.M. report no disclosures. T.S. has received speaker honoraria from Actavis and Alzheimer’s Association International Research Grant. E.S. has received speaker honoraria from Actavis. V.S.K. has received speaker honoraria from Actavis and Solveo. F.A. is Section Editor of NeuroImage: Clinical; has received speaker honoraria from Novartis, Biogen Idec and Philips; and receives or has received research supports from the Italian Ministry of Health, AriSLA (Fondazione Italiana di Ricerca per la SLA), and the European Research Council.

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Correspondence to Massimo Filippi.

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Filippi, M., Basaia, S., Sarasso, E. et al. Longitudinal brain connectivity changes and clinical evolution in Parkinson’s disease. Mol Psychiatry 26, 5429–5440 (2021). https://doi.org/10.1038/s41380-020-0770-0

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