DLG2 and Familial paroxysmal ataxia: Indeed, mutations in multiple Kv1 channel genes and copy number variations of the Dlg2 gene (which codes for PSD93) are associated with multiple neurological conditions characterized by neuronal hyperexcitability, including epilepsy, myokemia, episodic ataxia, schizophrenia, autism spectrum disorder, and intellectual disability (Cuscó et al., 2009; Eunson et al., 2000; Felix, 2000; Gao et al., 2018; Reggiani et al., 2017; Walsh et al., 2008).