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

Roostaei, T ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1212/WNL.0000000000002326
  3. Publisher: Lippincott Williams and Wilkins
  4. Abstract:
  5. 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 (r2 = 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 rs6795970AA genotype performed significantly worse than rs6795970G 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, rs6795970AA 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
  6. Keywords:
  7. Sodium channel Nav1.8 ; Adult ; Allele ; Article ; Brain size ; Cerebellar dysfunction ; Cerebellar volumetry ; Cerebellum atrophy ; Cerebellum disease ; Channelopathy ; Controlled study ; Expanded Disability Status Scale ; Female ; Follow up ; Functional magnetic resonance imaging ; Gene frequency ; Gene linkage disequilibrium ; Genetic association ; Genetic variability ; Genotype ; Heterozygote ; Human ; Major clinical study ; Male ; Mesencephalon ; Multiple sclerosis ; Multiple Sclerosis Functional Composite ; Neurologic disease assessment ; Nuclear magnetic resonance imaging ; Occipital cortex ; Paced auditory serial addition test ; Phenotype ; Prediction ; Priority journal ; Thalamus ; Volumetry ; Voxel based morphometry ; White matter
  8. Source: Neurology ; Volume 86, Issue 5 , 2016 , Pages 410-417 ; 00283878 (ISSN)
  9. URL: http://www.neurology.org/content/86/5/410