Rasmussen encephalitis associated with SCN 1 A mutation.
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Ohmori I, Ouchida M, Kobayashi K, Jitsumori Y, Inoue T, Shimizu K, Matsui H, Ohtsuka Y, Maegaki Y
Rasmussen encephalitis associated with SCN 1 A mutation.
Epilepsia. 2008 Mar;49(3):521-6. Epub 2007 Nov 21.
- PubMed ID
- 18031552 [ View in PubMed]
- Abstract
Mutations in the SCN 1 A gene, encoding the neuronal voltage-gated sodium channel alpha1 subunit, cause SMEI, GEFS+, and related epileptic syndromes. We herein report the R1575C-SCN 1 A mutation identified in a patient with Rasmussen encephalitis. R1575C were constructed in a recombinant human SCN 1 A and then heterologously expressed in HEK293 cells along with the human beta1 and beta2 sodium channel accessory subunits. Whole-cell patch-clamp recording was used to define biophysical properties. The R1575C channels exhibited increased channel availability and an increased persistent sodium current in comparison to the wild-type. These defects of electrophysiological properties can result in neuronal hyperexitability. The seizure susceptibility allele may influence the pathogenesis of Rasmussen encephalitis in this case.