One patient had a microdeletion, classified here as possibly pathogenic, which includes STAG1, now linked with epilepsy as a cohesinopathy,24 and one patient carried a de novo intragenic duplication in FGF12 in which SNVs have recently been reported in patients with epileptic encephalopathies.25 Here, STAG1 is linked to Epileptic encephalopathy.