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"While hyperkinetic movements are not characteristic of SCN1A -linked DS, similar movement disorders are associated with SCN2A - and SCN8A -linked EIEEs; this overlap in symptomology led Sadleir et al to speculate that the early infantile SCN1A encephalopathy, like SCN2A - and SCN8A -linked EIEEs, may be associated with a gain-of-function (GOF) variant—a theory that was addressed by Berecki et al in their 2019 Annals of Neurology manuscript."