| Phenotype details |
see paper; ...,childhood normal motor milestones, 3y-started speaking, mental development slightly delayed, first 3y academic performance sufficient, 11y-progressive mental retardation, 10y-generalized photosensitive and myoclonic epilepsy; 36y-seizures (well controlled with medicati), severe mental retardation, cerebellar syndrome, dysarthria, markedly reduced ocular saccades in both planes associated with insuppressible head movements, generalized choreodystonia, increased tendon reflexes, positive Babinski sign bilaterally; EEG shows irregular theta activity, frequent sharp theta waves, complexes of sharp and slow waves over the left hemisphere with incomplete synchronization |