Channelopathy-related SCN10A gene variants predict cerebellar dysfunction in multiple sclerosis.

TitleChannelopathy-related SCN10A gene variants predict cerebellar dysfunction in multiple sclerosis.
Publication TypeJournal Article
Year of Publication2016
AuthorsRoostaei T, Sadaghiani S, Park MTae M, Mashhadi R, Nazeri A, Noshad S, Salehi MJavad, Naghibzadeh M, Moghadasi ANaser, Owji M, Doosti R, Taheri APejman Has, Rad AShakouri, Azimi A, M Chakravarty M, Voineskos AN, Nazeri A, Sahraian MAli
JournalNeurology
Volume86
Issue5
Pagination410-7
Date Published2016 Feb 02
ISSN1526-632X
KeywordsAdolescent, Adult, Cerebellar Diseases, Channelopathies, Female, Genetic Variation, Humans, Iran, Longitudinal Studies, Male, Middle Aged, Multiple Sclerosis, NAV1.8 Voltage-Gated Sodium Channel, Predictive Value of Tests, Young Adult
Abstract

OBJECTIVE: To determine the motor-behavioral and neural correlates of putative functional common variants in the sodium-channel NaV1.8 encoding gene (SCN10A) in vivo in patients with multiple sclerosis (MS).METHODS: We recruited 161 patients with relapsing-onset MS and 94 demographically comparable healthy participants. All patients with MS underwent structural MRI and clinical examinations (Expanded Disability Status Scale [EDSS] and Multiple Sclerosis Functional Composite [MSFC]). Whole-brain voxel-wise and cerebellar volumetry were performed to assess differences in regional brain volumes between genotype groups. Resting-state fMRI was acquired from 62 patients with MS to evaluate differences in cerebellar functional connectivity. All participants were genotyped for 4 potentially functional SCN10A polymorphisms.RESULTS: Two SCN10A polymorphisms in high linkage disequilibrium (r(2) = 0.95) showed significant association with MSFC performance in patients with MS (rs6795970: p = 6.2 × 10(-4); rs6801957: p = 0.0025). Patients with MS with rs6795970(AA) genotype performed significantly worse than rs6795970(G) carriers in MSFC (p = 1.8 × 10(-4)) and all of its subscores. This association was independent of EDSS and cerebellar atrophy. Although the genotype groups showed no difference in regional brain volumes, rs6795970(AA) carriers demonstrated significantly diminished cerebellar functional connectivity with the thalami and midbrain. No significant SCN10A-genotype effect was observed on MSFC performance in healthy participants.CONCLUSIONS: Our data suggest that SCN10A variation substantially influences functional status, including prominent effects on motor coordination in patients with MS. These findings were supported by the effects of this variant on a neural system important for motor coordination, namely cerebello-thalamic circuitry. Overall, our findings add to the emerging evidence that suggests that sodium channel NaV1.8 could serve as a target for future drug-based interventions to treat cerebellar dysfunction in MS.

DOI10.1212/WNL.0000000000002326
Alternate JournalNeurology
PubMed ID26740675
PubMed Central IDPMC4773947
Grant ListR01MH099167 / MH / NIMH NIH HHS / United States
R01MH102324 / MH / NIMH NIH HHS / United States
/ / Canadian Institutes of Health Research / Canada

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