What are the other types of heritable dystonia?
There are other types of heritable dystonia, each of which is distinguished by the gene responsible for the disorder. For example, the gene for dopa-responsive dystonia (DRD) has been identified and well characterized. The gene locations for several other dystonias have also been determined, including that for X-linked parkinsonism on the X chromosome. Another disease gene located on chromosome 8 codes for a type of dystonia observed predominantly in the Amish and Mennonite populations. Other genetic forms of dystonia are summarized in the table Dystonia: Molecular Classification. If a gene test is negative, it is possible that another genetic form is present but not the one tested.
