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Brain, Vol. 125, No. 10, 2248-2256, October 2002
© 2002 Oxford University Press

Progression of nigrostriatal dysfunction in a parkin kindred: an [18F]dopa PET and clinical study

Naheed L. Khan1,2, David J. Brooks1, Nicola Pavese1, Mary G. Sweeney2, Nicholas W. Wood2, Andrew J. Lees3 and Paola Piccini1

1 MRC Clinical Sciences Centre, and Division of Neuroscience, Faculty of Medicine, Imperial College, Hammersmith Hospital, 2 Neurogenetics Unit, Institute of Neurology and 3 Reta Lila Weston Institute of Neurological Studies, Royal Free Hospital and University College Medical School, London, UK

Correspondence to: P. Piccini, MRC Cyclotron Building, Hammersmith Hospital, Du Cane Road, London W12 0NN, UK E-mail: paola.piccini{at}csc.mrc.ac.uk

Molecular and clinical characterization of parkin-associated parkinsonism is well described; however, there are no data available on progression of dopamine terminal dysfunction in parkin-associated disease. We have used [18F]dopa PET serially to study members of a family with young-onset parkinsonism who are compound heterozygous for mutations in the parkin gene, having an exonic deletion and a novel intronic splice site mutation. Four patients have been studied twice, 10 years apart, to assess disease progression. Additionally, we have studied five asymptomatic family members, four of whom carry a single parkin mutation and one individual who has a normal genotype. Two of the carriers and the individual with the normal genotype had repeat [18F]dopa PET. The group of parkin patients showed a significantly slower loss of putamen [18F]dopa uptake (P = 0.0008) compared with a group of idiopathic Parkinson’s disease (IPD) patients who had baseline putamen [18F]dopa uptake and disease severity similar to the parkin group. These results indicate that disease progression in patients with parkin mutations is slower than that of IPD patients. The group of asymptomatic parkin carriers also showed significant striatal dopaminergic dysfunction, and three of them developed subtle extrapyramidal signs. However, the two carriers scanned twice showed no progression over a 7-year period. The slower rate of disease progression in parkin patients may explain the near normal longevity of these patients with young onset parkinsonism.


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