Genetic ablation of tau, even by 50% by inactivation of a single Mapt allele, also reduces epileptic activity, high mortality rates, and cognitive deficits in the Scn1a mouse model of Dravet syndrome, a severe and intractable childhood epilepsy that is caused by mutations in the SCN1A gene and can lead to autism (Catterall et al., 2010; Li et al., 2011; Gheyara et al., 2014; Anwar et al., 2019; Tai et al., 2020). This evidence concerns the gene SCN1A and autism.