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The DYT1 GAG deletion is infrequent in sporadic and familial writer's cramp
Author(s) -
Kamm Christoph,
Naumann Markus,
Mueller Joerg,
Mai Norbert,
Riedel Leonhard,
Wissel Joerg,
Gasser Thomas
Publication year - 2000
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/1531-8257(200011)15:6<1238::aid-mds1027>3.0.co;2-z
Subject(s) - mutation , dystonia , family history , medicine , index case , genetics , pediatrics , psychology , gene , biology , disease , psychiatry
A 3‐base pair (GAG) deletion in the DYT1 gene has recently been found to be responsible for most cases of early‐onset primary generalized dystonia. In some cases, this mutation has been associated with writer's cramp. To determine the frequency of this mutation in a larger series of patients, we examined 44 index patients with sporadic or familial (seven patients) writer's cramp for the presence of the DYT1 GAG deletion, including eight patients with segmental dystonia involving at least one upper limb. We found the mutation in none of these index patients, which confirms that isolated writer's cramp is only in rare cases a phenotypic manifestation of this mutation, even if a positive family history of writer's cramp is present.