SLC8A1 and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: An ATP6V0C de novo variant had been reported in a SCN1A-negative patient with Dravet syndrome while the patient simultaneously harbored de novo missense variants in the genes of NKAIN3 and SLC8A1 (Carvill et al., 2014).