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• W4367187810 abstract "Pathogenic variants in SCN2A are associated with a range of neurodevelopmental disorders (NDD). SCN2A -related NDD show wide phenotypic heterogeneity, suggesting that modifying factors must be considered in order to properly elucidate the mechanisms of pathogenic variants. Recently, we characterized neurological phenotypes in a mouse model of the variant SCN2A -p.K1422E. We demonstrated that heterozygous Scn2aK1422E female mice showed a distinct, reproducible distribution of flurothyl-induced seizure thresholds. Women with epilepsy often show a cyclical pattern of altered seizure susceptibility during specific phases of the menstrual cycle which can be attributed to fluctuations in hormones and corresponding changes in neurosteroid levels. Rodent models have been used extensively to examine the relationship between the estrous (menstrual) cycle, steroid hormones, and seizure susceptibility. However, the effects of the estrous cycle on seizure susceptibility have not been evaluated in the context of an epilepsy-associated genetic variant. To determine whether the estrous cycle affects susceptibility to flurothyl-induced seizures in Scn2aK1422E female mice, estrous cycle monitoring was performed in mice that had undergone ovariectomy (OVX), sham surgery, or no treatment prior to seizure induction. Removing the influence of circulating sex hormones via OVX did not affect the non-unimodal distribution of flurothyl seizure thresholds observed in Scn2aK1422E females. Additionally, flurothyl seizure thresholds were not associated with estrous cycle stage in mice that underwent sham surgery or were untreated. These data suggest that variation in Scn2aK1422E flurothyl seizure threshold is not significantly influenced by the estrous cycle and, by extension, fluctuations in ovarian hormones. Interestingly, untreated Scn2aK1422E females showed evidence of disrupted estrous cyclicity, an effect not previously described in a genetic epilepsy model. This unexpected result highlights the importance of considering sex specific effects and the estrous cycle in support of more inclusive biomedical research." @default.
• W4367187810 created "2023-04-28" @default.
• W4367187810 creator A5034085800 @default.
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• W4367187810 date "2023-04-27" @default.
• W4367187810 modified "2023-09-28" @default.
• W4367187810 title "Evaluating the interplay between estrous cyclicity and induced seizure susceptibility in<i>Scn2a^K1422E</i>mice" @default.
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• W4367187810 doi "https://doi.org/10.1101/2023.04.27.538584" @default.
• W4367187810 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37163100" @default.
• W4367187810 hasPublicationYear "2023" @default.
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