KCNQ2 and developmental and epileptic encephalopathy: Heterozygous KCNQ2 pathogenic variants cause a broad phenotypic spectrum of mostly neonatal onset epilepsies; these range from self‐limited familial neonatal epilepsy (SLFNE) to severe sporadic cases of developmental and epileptic encephalopathy (KCNQ2‐DEE) most often caused by de novo missense variants.