GABRG2 and encephalopathy, progressive, early-onset, with brain edema and/or leukoencephalopathy: Variants in GABRG2 have been associated with a wide range of epileptic syndromes, from mild cases of FS and CAE to more severe forms of epilepsy such as Dravet syndrome [11,15,16,21,22,23,24,25,26,27].