| Phenotype details |
see paper; ..., global developmental delay, severe intellectual disability; 6y-9y-seizures; EEG generalized poly-spike and wave; MRI brain normal, generalized tremor, facial myokimia, bradykinesia, hypomimia, rigidity, freezing and impaired postural reactions, frontal lobe impairment features, no seizures since the age of 9 years, normal glycosylation assay; current therapy VPA, clonazepam, tetrabenazine |