GCH1 mutation in a patient with adult-onset oromandibular dystonia.

The authors report a mutation in exon 5 of GCH1 in a patient with adult-onset oromandibular dystonia and no obvious family history of dystonia.
The patient responded positively to treatment with L-dopa.
These findings demonstrate that GCH1 mutations must be considered even in patients with dystonic symptoms not typical of dopa-responsive dystonia.

