Clinical and electroencephalographic findings in juvenile type DRPLA

We present five different types of dentatorubral-pallidoluysian atrophy in one Japanese family. Two siblings and their paternal uncle manifested the juvenile type dentatorubral-pallidoluysian atrophy, the siblings' father had the late-adult type, and another paternal uncle had the early-adult type. Gene analysis confirmed the diagnosis for the proband and her sibling. By following the clinical courses and electroencephalographic changes, we found that the types of epileptic seizures and the electroencephalograms of the juvenile dentatorubral-pallidoluysian atrophy patients changed as the illness progressed. The siblings exhibited different levels of clinical severity despite the similar deoxyribonucleic acid expansion detected in their lymphocytes.