Comprehensive analysis of the LRRK2 gene in sixty families with Parkinson's disease by Di Fonzo Alessio, Tassorelli Cristina, De Mari Michele, Chien Hsin F, Ferreira Joaquim, Rohé Christan F, Riboldazzi Giulio, Antonini Angelo, Albani Gianni, Mauro Alessandro, Marconi Roberto, Abbruzzese Giovanni, Lopiano Leonardo, Fincati Emiliana, Guidi Marco, Marini Paolo, Stocchi Fabrizio, Onofrj Marco, Toni Vincenzo, Tinazzi Michele, Fabbrini Giovanni, Lamberti Paolo, Vanacore Nicola, Meco Giuseppe, Leitner Petra, Uitti Ryan J, Wszolek Zbigniew K, Gasser Thomas, Simons Erik J, Breedveld Guido J, Goldwurm Stefano, Pezzoli Gianni, Sampaio Cristina, Barbosa Egberto, Martignoni Emilia, Oostra Ben A, Bonifati Vincenzo, Italian Parkinson's Genetics Network in European journal of human genetics : EJHG (2006). PubMed

Abstract

Mutations in the gene leucine-rich repeat kinase 2 (LRRK2) have been recently identified in families with Parkinson's disease (PD). However, the prevalence and nature of LRRK2 mutations, the polymorphism content of the gene, and the associated phenotypes remain poorly understood. We performed a comprehensive study of this gene in a large sample of families with Parkinson's disease compatible with autosomal dominant inheritance (ADPD). The full-length open reading frame and splice sites of the LRRK2 gene (51 exons) were studied by genomic sequencing in 60 probands with ADPD (83% Italian). Pathogenic mutations were identified in six probands (10%): the heterozygous p.G2019S mutation in four (6.6%), and the heterozygous p.R1441C mutation in two (3.4%) probands. A further proband carried the heterozygous p.I1371 V mutation, for which a pathogenic role could not be established with certainty. In total, 13 novel disease-unrelated variants and three intronic changes of uncertain significance were also characterized. The phenotype associated with LRRK2 pathogenic mutations is the one of typical PD, but with a broad range of onset ages (mean 55.2, range 38-68 years) and, in some cases, slow disease progression. On the basis of the comprehensive study in a large sample, we conclude that pathogenic LRRK2 mutations are frequent in ADPD, and they cluster in the C-terminal half of the encoded protein. These data have implications both for understanding the molecular mechanisms of PD, and for directing the genetic screening in clinical practice.

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