Case presentation: D.H.S., male, 23 months, non-consanguineous parents, born at term, pregnancy and delivery without complications, healthy 7-year-old brother, no cases of epilepsy or developmental delay in the family. From birth he had difficulty breastfeeding hypotonia, 3 months started episodes behavioral arrest, 9 lip cyanosis, hypertonia four limbs lasting less than one minute post-ictal w...