Clinical-genetic studies of idiopathic torsion dystonia (ITD) indicate that the DYT1 gene on chromosome 9q34 is responsible for most childhood limb- onset disease. The genetic basis of adult-onset ITD is less well studied. In most multiplex adult-onset ITD families, dystonia is limited to the cervical, cranial, or brachial muscles; in a few rare families, dystonia also involves the legs and trunk. Previous linkage studies have excluded the DYT1 locus in these atypical families. We studied two large non-Jewish families with adult- onset ITD limited to the cervical and brachial muscles and excluded the DYT1- containing region. This study further restricts the role of DYT1 to childhood limb-onset ITD and suggests that other genes are responsible for focal adult- onset ITD.
ASJC Scopus subject areas
- Clinical Neurology