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• W3197239872 endingPage "21.2021" @default.
• W3197239872 startingPage "ENEURO.0002" @default.
• W3197239872 abstract "Abstract Mutations in the voltage-gated sodium channel gene SCN1A are associated with human epilepsy disorders, but how most of these mutations alter channel properties and result in seizures is unknown. This study focuses on two different mutations occurring at one position within SCN1A . R1648C (R-C) is associated with the severe disorder Dravet syndrome, and R1648H (R-H), with the milder disorder GEFS+. To explore how these different mutations contribute to distinct seizure disorders, Drosophila lines with the R-C or R-H mutation, or R1648R (R-R) control substitution in the fly sodium channel gene para were generated by CRISPR-Cas9 gene editing. The R-C and R-H mutations are homozygous lethal. Animals heterozygous for R-C or R-H mutations displayed reduced life spans and spontaneous and temperature-induced seizures not observed in R-R controls. Electrophysiological recordings from adult GABAergic neurons in R-C and R-H mutants revealed the appearance of sustained neuronal depolarizations and altered firing frequency that were exacerbated at elevated temperature. The only significant change observed in underlying sodium currents in both R-C and R-H mutants was a hyperpolarized deactivation threshold at room and elevated temperature compared with R-R controls. Since this change is constitutive, it is likely to interact with heat-induced changes in other cellular properties to result in the heat-induced increase in sustained depolarizations and seizure activity. Further, the similarity of the behavioral and cellular phenotypes in the R-C and R-H fly lines, suggests that disease symptoms of different severity associated with these mutations in humans could be due in large part to differences in genetic background." @default.
• W3197239872 created "2021-09-13" @default.
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• W3197239872 date "2021-09-01" @default.
• W3197239872 modified "2023-10-18" @default.
• W3197239872 title "Seizure Phenotype and Underlying Cellular Defects in<i>Drosophila</i>Knock-In Models of DS (R1648C) and GEFS+ (R1648H)<i>SCN1A</i>Epilepsy" @default.
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• W3197239872 doi "https://doi.org/10.1523/eneuro.0002-21.2021" @default.
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