A homozygous mutation of voltage-gated sodium channel βi gene SCN1B in a patient with Dravet syndrome

Ikuo Ogiwara, Tojo Nakayama, Tetsushi Yamagata, Hideyuki Ohtani, Emi Mazaki, Shigeru Tsuchiya, Yushi Inoue, Kazuhiro Yamakawa

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    54 Citations (Scopus)

    Abstract

    Dravet syndrome is a severe form of epileptic encephalopathy characterized by early onset epileptic seizures followed by ataxia and cognitive decline. Approximately 80% of patients with Dravet syndrome have been associated with heterozygous mutations in SCN1A gene encoding voltage-gated sodium channel (VGSC) αI subunit, whereas a homozygous mutation (p.Arg125Cys) of SCN1B gene encoding VGSC βI subunit was recently described in a patient with Dravet syndrome. To further examine the involvement of homozygous SCN1B mutations in the etiology of Dravet syndrome, we performed mutational analyses on SCN1B in 286 patients with epileptic disorders, including 67 patients with Dravet syndrome who have been negative for SCN1A and SCN2A mutations. In the cohort, we found one additional homozygous mutation (p.Ile106Phe) in a patient with Dravet syndrome. The identified homozygous SCN1B mutations indicate that SCN1B is an etiologic candidate underlying Dravet syndrome.

    Original languageEnglish
    Pages (from-to)e200-e203
    JournalEpilepsia
    Volume53
    Issue number12
    DOIs
    Publication statusPublished - 2012 Dec

    Keywords

    • Dravet syndrome
    • SCN1B
    • Voltage-gated sodium channel β

    ASJC Scopus subject areas

    • Neurology
    • Clinical Neurology

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  • Cite this

    Ogiwara, I., Nakayama, T., Yamagata, T., Ohtani, H., Mazaki, E., Tsuchiya, S., Inoue, Y., & Yamakawa, K. (2012). A homozygous mutation of voltage-gated sodium channel βi gene SCN1B in a patient with Dravet syndrome. Epilepsia, 53(12), e200-e203. https://doi.org/10.1111/epi.12040