Dopa-responsive dystonia or early-onset Parkinson disease - Genotype-phenotype correlation.

Abstract excerpt

OBJECTIVE: Dopa-responsive dystonia (DRD) is a rare form of hereditary movement disorder with onset in childhood, characterized by gait difficulties due to postural dystonia with marked improvement after low doses of levodopa. Mutations in the GCH1 gene are the most common cause of DRD, however, in some cases when the disease is associated with parkinsonism mutations in the PARK2 gene may be identified. The aim...

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