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Rapid-onset dystonia-parkinsonism
W B Dobyns1, L J Ozelius, P L Kramer
1Department of Neurology, University of Minnesota Medical School, Minneapolis.
Neurology
|December 1, 1993
Summary
Researchers identified a new autosomal dominant disorder, rapid-onset dystonia-parkinsonism (RDP), characterized by rapid symptom evolution. This condition is distinct from other hereditary dystonia-parkinsonism syndromes, including DYT1.
Area of Science:
- Neuroscience
- Genetics
- Neurology
Background:
- A large family presented with a previously undescribed autosomal dominant dystonia-parkinsonism syndrome.
- The disorder, termed rapid-onset dystonia-parkinsonism (RDP), exhibits unusually rapid symptom evolution.
Purpose of the Study:
- To characterize a novel hereditary dystonia-parkinsonism syndrome.
- To differentiate RDP from known genetic forms of dystonia-parkinsonism.
Main Methods:
- Clinical evaluation of affected family members.
- Genetic linkage analysis to exclude known dystonia genes, including DYT1.
- Assessment of cerebrospinal fluid (CSF) homovanillic acid levels.
Main Results:
- RDP onset occurred between 14 and 45 years, with acute or subacute symptom progression.
- Symptoms included dystonia and parkinsonism, with slow subsequent progression.
- CSF homovanillic acid levels were decreased; dopaminergic therapy showed minimal benefit.
- Linkage analysis excluded the DYT1 gene as the cause of RDP.
Conclusions:
- Rapid-onset dystonia-parkinsonism (RDP) is a unique, autosomal dominant neurological disorder.
- RDP should be classified separately from other hereditary dystonia-parkinsonism syndromes.
- The genetic basis of RDP remains to be identified.