Genotypic and phenotypic characteristics of Dutch patients with early onset Parkinson's disease |
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Authors: | Maria G. Macedo MSc Dagmar Verbaan MSc Yue Fang PhD Stephanie M. van Rooden MSc Martine Visser PhD Burcu Anar MSc Antonella Uras MSc Justus L. Groen MSc MD Patrizia Rizzu PhD Jacobus J. van Hilten MD PhD Peter Heutink PhD |
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Affiliation: | 1. Section of Medical Genomics, Department of Clinical Genetics, VU University Medical Center, Amsterdam, The Netherlands;2. The first two authors contributed equally to this work.;3. Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands |
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Abstract: | Early onset Parkinson's disease (EOPD) has been associated with mutations in the Parkin, DJ‐1, PINK1, LRRK2, and SNCA genes. The aim of this study is to assess the contribution of these genes in a Dutch EOPD cohort and the phenotypic characteristics of the mutation carriers. A total of 187 unrelated Dutch EOPD patients (age at onset ≤ 50 years) were phenotyped and screened for mutations in all exons of Parkin, DJ‐1, and PINK1 by direct sequencing and gene dosage analysis. Additionally, analysis of the A30P mutation and exon dosage of SNCA and sequencing of exons 19,31,35,38,41, and 48 of LRRK2 was performed. Pathogenic variations could explain disease in 4% (7 of 187) of the patients including five patients carrying homozygous or compound heterozygous mutations in Parkin, one with a novel homozygous deletion in DJ‐1 (P158Del) and one with a heterozygous mutation in LRRK2 (T2356I). We found seven novel mutations. The phenotypic characteristics of mutation carriers varied widely, comparable to the variability seen in sporadic EOPD. Parkin is the most frequently mutated gene in this EOPD cohort, followed by DJ‐1, PINK1 and LRRK2. The low overall mutation frequency indicates that the extrapolation of mutation frequencies from other populations should be applied with caution. © 2008 Movement Disorder Society |
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Keywords: | Parkinson's disease mutations genotype phenotype |
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