The voltage-gated sodium channel Scn8a is a genetic modifier of severe myoclonic epilepsy of infancy

Página do item simplificado
dc.contributor.authorMartin, Melinda S.
dc.contributor.authorTang, Bin
dc.contributor.authorPapale, Ligia Assumpção [UNIFESP]
dc.contributor.authorYu, Frank H.
dc.contributor.authorCatterall, William A.
dc.contributor.authorEscayg, Andrew
dc.contributor.institutionEmory Univ
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniv Washington
dc.date.accessioned2016-01-24T13:49:13Z
dc.date.available2016-01-24T13:49:13Z
dc.date.issued2007-12-01
dc.description.abstractThe mammalian genome contains four voltage-gated sodium channel genes that are primarily expressed in the central nervous system: SCN1A, SCN2A, SCN3A and SCN8A. Mutations in SCN1A and SCN2A are responsible for several dominant idiopathic epilepsy disorders, including generalized epilepsy with febrile seizures plus (GEFS+) and severe myoclonic epilepsy of infancy (SMEI). Mutations in SCN8A are associated with cognitive deficits and neuropsychiatric illness in humans and movement disorders in mice; however, a role for SCN8A (Na(v)1.6) in epilepsy has not been investigated. To determine the relationship between Nav1.6 dysfunction and seizure susceptibility, we examined the thresholds of two Scn8a mouse mutants, Scn8a(med) and Scn8a (med-jo), to flurothyl- and kainic acid (KA)-induced seizures. Both mutants were more seizure resistant than wild-type littermates, suggesting that altered Nav1.6 function reduces neuronal excitability. To determine whether impaired Nav1.6 function could ameliorate seizure severity in a mouse model of SMEI, we generated Scn1a(+/-); Scn8a (med-jo/+) double heterozygous mice. Unlike Scn1a(+/-) mice that are more susceptible to flurothyl- induced seizures, Scn1a(+/-); Scn8a(med-jo/+) mice displayed thresholds that were comparable to wildtype littermates. the Scn8a(med-jo) allele was also able to rescue the premature lethality of Scn1a(+/-) mice and extend the lifespan of Scn1a(-/-) mutants. These results demonstrate that genetic interactions can alter seizure severity and support the hypothesis that genetic modifiers contribute to the clinical variability observed in SMEI and GEFS+.en
dc.description.affiliationEmory Univ, Dept Human Genet, Atlanta, GA 30322 USA
dc.description.affiliationUniversidade Federal de São Paulo, Dept Psychobiol, São Paulo, Brazil
dc.description.affiliationUniv Washington, Dept Pharmacol, Seattle, WA 98195 USA
dc.description.affiliationUnifespUniversidade Federal de São Paulo, Dept Psychobiol, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent2892-2899
dc.identifierhttp://dx.doi.org/10.1093/hmg/ddm248
dc.identifier.citationHuman Molecular Genetics. Oxford: Oxford Univ Press, v. 16, n. 23, p. 2892-2899, 2007.
dc.identifier.doi10.1093/hmg/ddm248
dc.identifier.issn0964-6906
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/30158
dc.identifier.wosWOS:000251036400010
dc.language.isoeng
dc.publisherOxford Univ Press
dc.relation.ispartofHuman Molecular Genetics
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rights.licensehttp://www.oxfordjournals.org/access_purchase/self-archiving_policyb.html
dc.titleThe voltage-gated sodium channel Scn8a is a genetic modifier of severe myoclonic epilepsy of infancyen
dc.typeinfo:eu-repo/semantics/article
Arquivos
Coleções
Em verificação - Geral