Brain Advance Access originally published online on January 9, 2006
Brain 2006 129(3):686-694; doi:10.1093/brain/awl005
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Mutational analysis of the PINK1 gene in early-onset parkinsonism in Europe and North Africa
1 INSERM U679 (former U289), Neurologie et Thérapeutique Expérimentale, CHU Pitié-Salpêtrière, 2 Département de Génétique, Cytogénétique et Embryologie, CHU Pitié-Salpêtrière, 3 Fédération de Neurologie, CHU Pitié-Salpêtrière, 4 UFR, CHU Pitié-Salpêtrière, Paris, 5 Service de Neurologie C, Hôpital Neurologique de Lyon, Lyon, 6 Service de Neurologie, CHU de Nice, Nice, France and 7 Department of Neurological Sciences, Federico II University, Naples, Italy
Correspondence to: Alexis Brice, INSERM U679, Hôpital de la Salpêtrière, 47, Boulevard de l'Hôpital, 75651 Paris cedex 13, France E-mail: brice{at}ccr.jussieu.fr
Parkinson's disease is a frequent disorder caused primarily by the loss of dopaminergic neurons of the substantia nigra. Mutations in the PTEN-induced kinase (PINK1) gene, in addition to those in parkin and DJ-1, have been found in families with recessive early-onset Parkinson's disease. We screened for parkin and PINK1 mutations in a panel of 177 autosomal recessive Parkinson's disease families with ages at onset
60 years, mostly from Europe. In 7 unrelated families, we identified 10 pathogenic PINK1 mutations (5 missense, 2 nonsense and 3 frameshift deletion mutations), 8 of which were novel. All the mutations were in the homozygous or compound heterozygous states. Interestingly, pseudo-dominant inheritance was observed in a family with two different mutations. The clinical characteristics of 12 PINK1 patients and 114 parkin patients were similar, even for signs such as dystonia at onset and increased reflexes, which were thought to be specific to parkin. In contrast, onset in patients with PINK1 mutations was earlier and increased reflexes were found more frequently than in patients without PINK1 or parkin mutations. These results suggest that PINK1 is the second most frequent causative gene in early-onset Parkinson's disease with a slowly progressive phenotype, indistinguishable from early-onset patients with parkin mutations.
Key Words: early-onset parkinsonism; PINK1; parkin; mutation
Abbreviations: EOP = early-onset parkinsonism; PINK1 = PTEN-induced putative kinase; UPDRS = Unified Parkinson's Disease Rating Scale
Received September 9, 2005. Revised December 8, 2005. Accepted December 9, 2005.
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