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A susceptibility gene for late-onset idiopathic Parkinson's disease

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Authors
Hicks, Andrew A
Petursson, Hjorvar
Jonsson, Thorlakur
Stefansson, Hreinn
Johannsdottir, Hrefna S
Sainz, Jesus
Frigge, Michael L
Kong, Augustine
Gulcher, Jeffrey R
Stefansson, Kari
Sveinbjornsdóttir, Sigurlaug
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Issue Date
2002-11-01

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Citation
Ann. Neurol. 2002, 52(5):549-55
Abstract
Eight regions of the genome (PARK1-8) have been implicated in autosomal dominant and autosomal recessive forms of early-onset Parkinson's disease. These forms constitute a few of all cases. However, except for a haplotype in six families (PARK3), no study has successfully mapped a gene or described mutations that contribute to the common late-onset Parkinson's disease. Some have even suggested that a genetic component does not exist. We cross-matched our nationwide genealogy database with a population-based list of Icelandic Parkinson's disease patients to search for families with more than one patient. We performed a genomewide scan on 117 patients and 168 of their unaffected relatives within 51 families using 781 microsatellite markers. Allele-sharing, model-independent analysis of the results showed linkage to a region on chromosome 1p32 with a logarithm of odds score of 3.9 (Z(lr) = 4.2). By increasing the information content with additional microsatellite markers in this region, we found that the logarithm of odds score increased to 4.9 (Z(lr) = 4.8). This result corresponds to an unadjusted p value of 1.0 x 10(-6) and p < 0.005 after adjusting for a genomewide search. We designate this region PARK10. We therefore have successfully mapped, to genomewide significance, a susceptibility gene for late-onset Parkinson's disease using multiple families drawn across a whole population. Identification of the susceptibility gene in this region may pave the way for a better understanding of the disease process, which, in turn, may lead to improved diagnostics and therapeutics.
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http://dx.doi.org/10.1002/ana.10324
ae974a485f413a2113503eed53cd6c53
10.1002/ana.10324
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