Dopa-responsive parkinsonism phenotype of Machado-Joseph disease: confirmation of 14q CAG expansion.

Abstract:

:The subtype IV of Machado-Joseph disease (MJD), characterized by parkinsonism variably combined with ataxia, distal atrophy, and sensory loss, has been all but ignored in recent reports of MJD, including those describing the molecular biologic substrate of the disease. We have demonstrated expansion of the CAG trinucleotide repeat of the MJD1 gene located on chromosome 14q32.1 in 2 patients of Azorean descent who presented with levodopa-responsive atypical parkinsonism. Previous publications have documented the presence of this expanded repeat in the other more common MJD phenotypes (I-III). To our knowledge, this is the first molecular biologic confirmation of the presence of the MJD1 gene in the subtype IV phenotype. Patients presenting with parkinsonism and peripheral neuropathy should be screened for this genetic defect.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Tuite PJ,Rogaeva EA,St George-Hyslop PH,Lang AE

doi

10.1002/ana.410380422

subject

Has Abstract

pub_date

1995-10-01 00:00:00

pages

684-7

issue

4

eissn

0364-5134

issn

1531-8249

journal_volume

38

pub_type

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