GNAO1 and infantile epileptic encephalopathy: Taken together with the findings of a recent report (Kelly et al., 2019), this finding expands the spectrum of GNAO1-related neurological conditions beyond the two most frequently reported and severe phenotypes, namely, early infantile epileptic encephalopathy (EIEE17, OMIM 615473) and early-onset hyperkinetic phenotype (OMIM 617493) (Schirinzi et al., 2018a).