Cited by 205Epilepsy research and treatmentIon channel regulation and functionCardiac electrophysiology and arrhythmias

The DOI matches its Crossref record; 30 of the 30 references it cites were found in a registry or an index.

De novo mutations of voltage-gated sodium channel α II gene SCN2A in intractable epilepsies

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Abstract

BACKGROUND: Mutations of voltage-gated sodium channel alpha(II) gene, SCN2A, have been described in a wide spectrum of epilepsies. While inherited SCN2A mutations have been identified in multiple mild epilepsy cases, a de novo SCN2A-R102X mutation, which we previously reported in a patient with sporadic intractable childhood localization-related epilepsy, remains unique. To validate the involvement of de novo SCN2A mutations in the etiology of intractable epilepsies, we sought to identify additional instances. METHODS: We performed mutational analyses on SCN2A in 116 patients with severe myoclonic epilepsy in infancy, infantile spasms, and other types of intractable childhood partial and generalized epilepsies and did whole-cell patch-clamp recordings on Na(v)1.2 channels containing identified mutations. RESULTS: We discovered 2 additional de novo SCN2A mutations. One mutation, SCN2A-E1211K, was identified in a patient with sporadic infantile spasms. SCN2A-E1211K produced channels with altered electrophysiologic properties compatible with both augmented (an approximately 18-mV hyperpolarizing shift in the voltage dependence of activation) and reduced (an approximately 22-mV hyperpolarizing shift in the voltage dependence of steady-state inactivation and a slowed recovery from inactivation) channel activities. The other de novo mutation, SCN2A-I1473M, was identified in a patient with sporadic neonatal epileptic encephalopathy. SCN2A-I1473M caused an approximately 14-mV hyperpolarizing shift in the voltage dependence of activation. CONCLUSIONS: The identified de novo mutations SCN2A-E1211K, -I1473M, and -R102X indicate that SCN2A is an etiologic candidate underlying a variety of intractable childhood epilepsies. The phenotypic variations among patients might be due to the different electrophysiologic properties of mutant channels.

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Metadata

Authors
Ogiwara, I., Ito, K., Sawaishi, Y., Osaka, H., Mazaki, E., Inoue, I., Montal, M., Hashikawa, T., Shike, T., Fujiwara, T., Inoue, Y., Kaneda, M., & Yamakawa, K.
Affiliations
Akita University (JP)
Venue
Neurology
Published
2009-09-29
Volume
73
Issue
13
Pages
1046-1053
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
OpenAlex
W2061682874
Cited by
205
References
30
Citations by year
2026: 8 · 2025: 4 · 2024: 5 · 2023: 10 · 2022: 8 · 2021: 16 · 2020: 14 · 2019: 18 · 2018: 14 · 2017: 15 · 2016: 12 · 2015: 18 · 2014: 21 · 2013: 14 · 2012: 11
FWCI
5.75
Type
journal article
Language
en
Open access
Locations
  • Neurology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Ministry of Health, Labour and Welfare
  • Fukuoka University
  • Hirosaki University
  • National Institutes of Health
  • RIKEN
  • National Institute of General Medical Sciences (GM-49711, R01GM049711)
  • RIKEN Brain Science Institute
Topics
  • Health Sciences › Medicine › Clinical Neurology › Epilepsy research and treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
Keywords
SCN2A, de novo mutations, drug-resistant epilepsy, infantile spasms, Dravet syndrome, neonatal epileptic encephalopathy, voltage dependence of activation, channel inactivation, recovery from inactivation, genotype-phenotype correlation
MeSH terms
Amino Acid Sequence, Cell Line, DNA Mutational Analysis, Epilepsies, Myoclonic, Female, Haplotypes, Humans, Infant, Newborn, Kidney, Male, Nerve Tissue Proteins, Severity of Illness Index, Spasms, Infantile, Transfection, Sodium Channels, Conserved Sequence, Protein Structure, Tertiary, Fatal Outcome, Patch-Clamp Techniques, Mutation, Missense, Young Adult, NAV1.2 Voltage-Gated Sodium Channel

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