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• W2044147947 abstract "To use computer simulation to perform a genetic sensitivity analysis to predict which genes are best positioned to increase risk as well as to predict functionally how variants in these genes might increase network excitability.A previously published, biophysically realistic model of the dentate gyrus that included mossy fiber sprouting between granule cells was used to model putative environmental changes associated with temporal lobe epilepsy. Properties of voltage-gated ion channels, either 1 at a time or in combinations, were varied systematically to determine their effect on network excitability.We found that the network is most sensitive to changes in steady-state voltage dependence of activation and relatively insensitive to changes in inactivation. Changes in sodium channels had the greatest effect on excitability, followed by changes in fast-delayed rectifier potassium channels and then N-type calcium channels. We also investigated the effects of simultaneous small changes in several ion channels, modeling a complex genetic background expected for common epilepsies. A combination of 2 or 3 simultaneous voltage shifts in steady-state activation as small as 2 mV could produce large changes in network excitability.Statistical power calculations indicate that changes this small are effectively undetectable with current experimental practices, thus posing new challenges for the functional analysis and validation of epilepsy genes." @default.
• W2044147947 created "2016-06-24" @default.
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• W2044147947 date "2009-10-01" @default.
• W2044147947 modified "2023-10-16" @default.
• W2044147947 title "Prediction by Modeling That Epilepsy May Be Caused by Very Small Functional Changes in Ion Channels" @default.
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• W2044147947 doi "https://doi.org/10.1001/archneurol.2009.219" @default.
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