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Relative contribution of simple mutations vs. copy number variations in five Parkinson disease genes in the Belgian population

Journal Contribution - Journal Article

The relative contribution of simple mutations and copy number variations (CNVs) in SNCA, PARK2, PINK1, PARK7, and LRRK2 to the genetic etiology of Parkinson disease (PD) is still unclear because most studies did not completely analyze each gene. In a large group of Belgian PD patients (N = 310) and control individuals (N = 270), we determined the mutation frequency of both simple mutations and CNVs in these five PD genes, using direct sequencing, multiplex amplicon quantification (MAQ), and real-time PCR assays. Overall, we identified 14 novel heterozygous variants, of which 11 were absent in control individuals. We observed eight PARK2 (multiple) exon multiplications in PD patients and one exon deletion in a control individual. Furthermore, we identified one SNCA whole-gene duplication. The PARK2 and LRRK2 mutation frequencies in Belgian PD patients were similar to those reported in other studies. However, at this stage the true pathogenic nature of some heterozygous mutations in recessive genes remains elusive. Furthermore, though mutations is SNCA, PINK1, and PARK7 are rare, our identification of a SNCA duplication confirmed that screening of these genes remains meaningful.

Journal: Human Mutation
ISSN: 1059-7794
Issue: 7
Volume: 30
Pages: 1054-1061
Number of pages: 8
Publication year:2009
Keywords:Belgium/epidemiology, Case-Control Studies, DNA Mutational Analysis, Gene Dosage, Gene Frequency, Genetics, Population, Humans, Intracellular Signaling Peptides and Proteins/genetics, Leucine-Rich Repeat Serine-Threonine Protein Kinase-2, Mutation, Oncogene Proteins/genetics, Parkinson Disease/genetics, Protein Deglycase DJ-1, Protein Kinases/genetics, Protein-Serine-Threonine Kinases/genetics, Ubiquitin-Protein Ligases/genetics, alpha-Synuclein/genetics