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- W2076100769 abstract "We used <sup>18</sup>F-dopa PET to examine concordance for dysfunction of the nigrostriatal dopaminergic system in 18 co-twins of patients with Parkinson9s disease (PD) and scanned one clinically concordant monozygotic (MZ) twin pair, 17 asymptomatic co-twins (10 MZ, 7 dizygotic [DZ]), and 13 twins with PD (8 MZ, 5 DZ). Mean <sup>18</sup>F-dopa uptake of the twins with PD was significantly reduced in putamen to 38% and in caudate to 66% of normal. Mean putamen <sup>18</sup>F-dopa uptake for the 17 asymptomatic co-twins was also significantly reduced (86% of normal), as was putamen tracer uptake for the 10 MZ (87% of normal) and seven DZ (83% of normal) asymptomatic co-twin subgroups. Four of 10 MZ and two of seven DZ asymptomatic co-twins had putamen <sup>18</sup>F-dopa uptake reduced more than 2 SDs below the normal mean. Three of these four asymptomatic MZ co-twins had tremor on examination at the time of PET and one has now developed PD 2 years later. Our PET findings give concordances for nigral dysfunction of 45% in the MZ pairs and 29% in the DZ pairs at a 2-SD threshold, and 18% in MZ and 0% in DZ pairs at a 3-SD threshold of significance. These data suggest that the concordance for nigral pathology in PD twins may be higher than previously realized and that the presence of an isolated postural or rest tremor may be a phenotypic expression of PD." @default.
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- W2076100769 title "Parkinson's disease in twins studied with 18F-dopa and positron emission tomography" @default.
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