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Disease Markers
Volume 35 (2013), Issue 3, Pages 181–185
http://dx.doi.org/10.1155/2013/597158
Research Article

Genetic Analysis of PARK2 and PINK1 Genes in Brazilian Patients with Early-Onset Parkinson's Disease

1Departamento de Genética, Instituto de Biologia Roberto Alcantara Gomes, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier 524, PHLC, Sala 501F, Maracanã, 20550-013 Rio de Janeiro, RJ, Brazil
2Laboratório de Genética Humana, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
3Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
4Santa Casa da Misericórdia do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
5Faculdade de Ciências Médicas, Centro Biomédico, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
6Núcleo Neurociências, Hospital das Clínicas, Universidade Federal de Goiás, Goiânia, GO, Brazil
7Instituto Integrado de Neurociências, Goiânia, GO, Brazil

Received 18 June 2013; Accepted 5 August 2013

Academic Editor: Yi-Chia Huang

Copyright © 2013 Karla Cristina Vasconcelos Moura et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Parkinson's disease is the second most frequent neurodegenerative disorder in the world, affecting 1-2% of individuals over the age of 65. The etiology of Parkinson's disease is complex, with the involvement of gene-environment interactions. Although it is considered a disease of late manifestation, early-onset forms of parkinsonism contribute to 5–10% of all cases. In the present study, we screened mutations in coding regions of PARK2 and PINK1 genes in 136 unrelated Brazilian patients with early-onset Parkinson's disease through automatic sequencing. We identified six missense variants in PARK2 gene: one known pathogenic mutation, two variants of uncertain role, and three nonpathogenic changes. No pathogenic mutation was identified in PINK1 gene, only benign polymorphisms. All putative pathogenic variants found in this study were in heterozygous state. Our data show that PARK2 point mutations are more common in Brazilian early-onset Parkinson's disease patients (2.9%) than PINK1 missense variants (0%), corroborating other studies worldwide.