Movement Disorders (revue)

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Functional connectivity changes related to cognitive and motor performance in spinocerebellar ataxia type 2.

Identifieur interne : 000234 ( PubMed/Checkpoint ); précédent : 000233; suivant : 000235

Functional connectivity changes related to cognitive and motor performance in spinocerebellar ataxia type 2.

Auteurs : Carlos R. Hernandez-Castillo [Mexique] ; Víctor Galvez [Mexique] ; Roberto E. Mercadillo [Mexique] ; Rosalinda Díaz [Mexique] ; Petra Yescas [Mexique] ; Leticia Martinez [Mexique] ; Adriana Ochoa [Mexique] ; Luis Velazquez-Perez [Cuba] ; Juan Fernandez-Ruiz [Mexique]

Source :

RBID : pubmed:26256273

Abstract

Several neuropathological studies in spinocerebellar ataxia type 2 (SCA2) have revealed significant atrophy of the cerebellum, brainstem, sensorimotor cortex, and several regions in the frontal lobe. However, the impact of the neurodegeneration on the functional integration of the remaining tissue is unknown. To analyze the clinical impact of these functional changes, we correlated the abnormal functional connectivity found in SCA2 patients with their scores in clinical scales. To obtain the functional connectivity changes, we followed two approaches. In one we used areas with significant cerebellar gray matter atrophy as anchor seeds, and in the other we performed a whole-brain data-driven analysis.

DOI: 10.1002/mds.26320
PubMed: 26256273


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pubmed:26256273

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<div type="abstract" xml:lang="en">Several neuropathological studies in spinocerebellar ataxia type 2 (SCA2) have revealed significant atrophy of the cerebellum, brainstem, sensorimotor cortex, and several regions in the frontal lobe. However, the impact of the neurodegeneration on the functional integration of the remaining tissue is unknown. To analyze the clinical impact of these functional changes, we correlated the abnormal functional connectivity found in SCA2 patients with their scores in clinical scales. To obtain the functional connectivity changes, we followed two approaches. In one we used areas with significant cerebellar gray matter atrophy as anchor seeds, and in the other we performed a whole-brain data-driven analysis.</div>
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<AbstractText Label="BACKGROUND" NlmCategory="BACKGROUND">Several neuropathological studies in spinocerebellar ataxia type 2 (SCA2) have revealed significant atrophy of the cerebellum, brainstem, sensorimotor cortex, and several regions in the frontal lobe. However, the impact of the neurodegeneration on the functional integration of the remaining tissue is unknown. To analyze the clinical impact of these functional changes, we correlated the abnormal functional connectivity found in SCA2 patients with their scores in clinical scales. To obtain the functional connectivity changes, we followed two approaches. In one we used areas with significant cerebellar gray matter atrophy as anchor seeds, and in the other we performed a whole-brain data-driven analysis.</AbstractText>
<AbstractText Label="METHODS" NlmCategory="METHODS">Fourteen genetically confirmed SCA2 patients and aged-matched healthy controls participated in the study. Voxel-based morphometry and resting-state functional magnetic resonance imaging (fMRI) were done to analyze structural and functional brain changes. Independent component analysis and dual regression were used for intrinsic network comparison. Significant functional connectivity differences were correlated with the behavioral scores.</AbstractText>
<AbstractText Label="RESULTS" NlmCategory="RESULTS">Seed-based analysis found reduced functional connectivity within the cerebellum and between the cerebellum and frontal/parietal cortices. Cerebellar functional connectivity increases were found with parietal, frontal, and temporal areas. Intrinsic network analysis found a functional decrease in the cerebellar network, and increase in the default-mode and fronto-parietal networks. Further analysis showed significant correlations between clinical scores and the abnormal functional connectivity strength.</AbstractText>
<AbstractText Label="CONCLUSION" NlmCategory="CONCLUSIONS">Our findings show significant correlations between functional connectivity changes in key areas affected in SCA2 and these patients' motor and neuropsychological impairments, adding an important insight to our understanding of the pathophysiology of SCA2.</AbstractText>
<CopyrightInformation>© 2015 International Parkinson and Movement Disorder Society.</CopyrightInformation>
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<name sortKey="Ochoa, Adriana" sort="Ochoa, Adriana" uniqKey="Ochoa A" first="Adriana" last="Ochoa">Adriana Ochoa</name>
<name sortKey="Yescas, Petra" sort="Yescas, Petra" uniqKey="Yescas P" first="Petra" last="Yescas">Petra Yescas</name>
</country>
<country name="Cuba">
<noRegion>
<name sortKey="Velazquez Perez, Luis" sort="Velazquez Perez, Luis" uniqKey="Velazquez Perez L" first="Luis" last="Velazquez-Perez">Luis Velazquez-Perez</name>
</noRegion>
</country>
</tree>
</affiliations>
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