KCNQ2 and ethylmalonic encephalopathy: KCNQ2 (OMIM 602235)-associated seizures usually occur during the first week after birth and can contribute to benign familial neonatal convulsions (BFNC), benign familial neonatal-infantile seizures (BFNIS), benign familial infantile seizures (BFIS)1–5, and neonatal-onset epileptic encephalopathy (EE)6–8.