Cited by 72Neurological disorders and treatmentsIon channel regulation and functionHereditary Neurological Disorders

Dystonia associated with mutation of the neuronal sodium channel Scn8a and identification of the modifier locus Scnm1 on mouse chromosome 3

Sprunger, L.·1999·Human Molecular Genetics

Abstract

The mouse mutant medJ contains a splice site mutation in the neuronal sodium channel Scn8a that results in a very low level of expression. On a C57BL/6J genetic background, medJ homozygotes exhibit progressive paralysis and juvenile lethality. The C3H genetic background has an ameliorating effect, producing viable adults with a novel dystonic phenotype. The dystonic mice exhibit movement-induced, sustained abnormal postures of the trunk and limbs. A dominant modifier locus responsible for the difference between strains was mapped to a 4.5 +/- 1.3 cM interval on mouse chromosome 3. Our findings establish a role for ion channels in dystonia and demonstrate the impact of genetic background on its severity and progression. This new model suggests that SCN8A on chromosome 12q13 and SCNM1 on chromosome 1p21-1q21 may contribute to human inherited dystonia.

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Crossref · 10.1093/hmg/8.3.471

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  • In the C3H background, medJ mice live a normal lifespan with dystonia and ataxia, with 10% of Scn8a transcripts correctly spliced.

    “In the C3H background, medJ mice live a normal lifespan with dystonia and ataxia, with 10% of Scn8a transcripts correctly spliced.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [152]

  • The severity of the medJ phenotype is affected by genetic background and correlates with the amount of correctly spliced transcript.

    “The severity of the medJ phenotype was found to be affected by genetic background and to correlate with the amount of correctly spliced transcript152.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [152]

  • The phenotypic severity of the Scn8amedJ hypomorphic allele is determined by a single gene modifier, Scnm1.

    “The phenotypic severity of the Scn8amedJ hypomorphic allele is determined by a single gene modifier, sodium channel modifier 1 (Scnm1).”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [152]

  • Targeted deletion of Scnm1 in the C3H strain confirmed that SCNM1 affects both the splicing of the Scn8amedJ transcript and the mouse phenotype.

    “targeted deletion of Scnm1 in the C3H strain confirmed that SCNM1 affects both the splicing of the Scn8amedJ transcript and the mouse phenotype152,153.”

    From The neurogenetics of alternative splicing (2016) · cites this paper as [152]

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Authors
Sprunger, L.
Affiliations
University of Michigan (US)
Corresponding author
Sprunger, L.
Venue
Human Molecular Genetics
Published
1999-03-01
Volume
8
Issue
3
Pages
471-479
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2125784996
Cited by
72
References
41
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 5 · 2020: 3 · 2019: 3 · 2018: 1 · 2016: 5 · 2015: 3 · 2014: 3 · 2013: 2 · 2012: 1
FWCI
4.27
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • University of Michigan
  • National Institutes of Health (5k08hl002972-06)
  • National Heart, Lung, and Blood Institute (K08 HL02972)
  • National Institute of General Medical Sciences (R01GM024872, GM 24872)
  • National Institute of Neurological Disorders and Stroke (NS 34509, R01NS034509)
Topics
  • Health Sciences › Medicine › Neurology › Neurological disorders and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
dystonia, SCN8A, neuronal sodium channels, modifier locus, splice site mutation, genetic background effects, progressive paralysis, mouse chromosome 3, ion channels, inherited dystonia
MeSH terms
Animals, Central Nervous System, Chromosome Mapping, Crosses, Genetic, Disease Models, Animal, Dystonia, Homozygote, Humans, Mice, Inbred C3H, Mice, Inbred C57BL, Mice, Mutant Strains, Mutation, Nerve Tissue Proteins, Phenotype, RNA Splicing, Species Specificity, Sodium Channels, Muscle, Skeletal, Mice, NAV1.6 Voltage-Gated Sodium Channel

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