Mapping Essential Tremor to a Common Brain Network Using Functional Connectivity Analysis.


Journal

Neurology
ISSN: 1526-632X
Titre abrégé: Neurology
Pays: United States
ID NLM: 0401060

Informations de publication

Date de publication:
10 10 2023
Historique:
received: 12 02 2023
accepted: 09 06 2023
pmc-release: 10 10 2024
medline: 23 10 2023
pubmed: 19 8 2023
entrez: 18 8 2023
Statut: ppublish

Résumé

The cerebello-thalamo-cortical circuit plays a critical role in essential tremor (ET). However, abnormalities have been reported in multiple brain regions outside this circuit, leading to inconsistent characterization of ET pathophysiology. Here, we test whether these mixed findings in ET localize to a common functional network and whether this network has therapeutic relevance. We conducted a systematic literature search to identify studies reporting structural or metabolic brain abnormalities in ET. We then used 'coordinate network mapping,' which leverages a normative connectome (n = 1,000) of resting-state fMRI data to identify regions commonly connected to findings across all studies. To assess whether these regions may be relevant for the treatment of ET, we compared our network with a therapeutic network derived from lesions that relieved ET. Finally, we investigated whether the functional connectivity of this ET symptom network is abnormal in an independent cohort of patients with ET as compared with healthy controls. Structural and metabolic brain abnormalities in ET were located in heterogeneous regions throughout the brain. However, these coordinates were connected to a common functional brain network, including the cerebellum, thalamus, motor cortex, precuneus, inferior parietal lobe, and insula. The cerebellum was identified as the hub of this network because it was the only brain region that was both functionally connected to the findings of over 90% of studies and significantly different in connectivity compared with a control data set of other movement disorders. This network was strikingly similar to the therapeutic network derived from lesions improving ET, with key regions aligning in the thalamus and cerebellum. Furthermore, positive functional connectivity between the cerebellar network hub and the sensorimotor cortices was significantly reduced in patients with ET compared with healthy controls, and connectivity within this network was correlated with tremor severity and cognitive functioning. These findings suggest that the cerebellum is the central hub of a network commonly connected to structural and metabolic abnormalities in ET. This network may have therapeutic utility in refining and informing new targets for neuromodulation of ET.

Sections du résumé

BACKGROUND AND OBJECTIVES
The cerebello-thalamo-cortical circuit plays a critical role in essential tremor (ET). However, abnormalities have been reported in multiple brain regions outside this circuit, leading to inconsistent characterization of ET pathophysiology. Here, we test whether these mixed findings in ET localize to a common functional network and whether this network has therapeutic relevance.
METHODS
We conducted a systematic literature search to identify studies reporting structural or metabolic brain abnormalities in ET. We then used 'coordinate network mapping,' which leverages a normative connectome (n = 1,000) of resting-state fMRI data to identify regions commonly connected to findings across all studies. To assess whether these regions may be relevant for the treatment of ET, we compared our network with a therapeutic network derived from lesions that relieved ET. Finally, we investigated whether the functional connectivity of this ET symptom network is abnormal in an independent cohort of patients with ET as compared with healthy controls.
RESULTS
Structural and metabolic brain abnormalities in ET were located in heterogeneous regions throughout the brain. However, these coordinates were connected to a common functional brain network, including the cerebellum, thalamus, motor cortex, precuneus, inferior parietal lobe, and insula. The cerebellum was identified as the hub of this network because it was the only brain region that was both functionally connected to the findings of over 90% of studies and significantly different in connectivity compared with a control data set of other movement disorders. This network was strikingly similar to the therapeutic network derived from lesions improving ET, with key regions aligning in the thalamus and cerebellum. Furthermore, positive functional connectivity between the cerebellar network hub and the sensorimotor cortices was significantly reduced in patients with ET compared with healthy controls, and connectivity within this network was correlated with tremor severity and cognitive functioning.
DISCUSSION
These findings suggest that the cerebellum is the central hub of a network commonly connected to structural and metabolic abnormalities in ET. This network may have therapeutic utility in refining and informing new targets for neuromodulation of ET.

Identifiants

pubmed: 37596042
pii: WNL.0000000000207701
doi: 10.1212/WNL.0000000000207701
pmc: PMC10585696
doi:

Types de publication

Journal Article Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

e1483-e1494

Informations de copyright

© 2023 American Academy of Neurology.

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Auteurs

Ellen Younger (E)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA. efyounge@deakin.edu.au.

Elizabeth G Ellis (EG)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Nicholas Parsons (N)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Patrizia Pantano (P)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Silvia Tommasin (S)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Karen Caeyenberghs (K)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Julián Benito-León (J)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Juan Pablo Romero (JP)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Juho Joutsa (J)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

Daniel T Corp (DT)

From the Cognitive Neuroscience Unit (E.Y., E.G.E., N.P., K.C., D.T.C.), School of Psychology, Deakin University, Geelong, Australia; Human Neuroscience (P.P., S.T.), Sapienza University of Rome; IRCCS NEUROMED (P.P.), Pozzilli, Italy; Department of Neurology (J.B.-L.) and Research Institute (i+12), University Hospital "12 de Octubre"; Centro de Investigación Biomédica en Red Sobre Enfermedades Neurodegenerativas (CIBERNED) (J.B.-L.); Department of Medicine (J.B.-L.), Complutense University; Facultad de Ciencias Experimentales (J.P.R.), Universidad Francisco de Vitoria; Brain Damage Unit (J.P.R.), Hospital Beata María Ana, Madrid, Spain; Turku Brain and Mind Center (J.J.), Clinical Neurosciences, University of Turku; Turku PET Centre (J.J.), Neurocenter, Turku University Hospital, Finland; and Center for Brain Circuit Therapeutics (D.T.C.), Department of Neurology, Psychiatry, and Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA.

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