Novel A18T and pA29S substitutions in α-synuclein may be associated with sporadic Parkinson's disease

Dorota Hoffman-Zacharska, Dariusz Koziorowski, Owen A. Ross, Michał Milewski, Jarosław Poznański, Marta Jurek, Zbigniew K. Wszolek, Alexandra Soto-Ortolaza, Jarosław Sławek, Piotr Janik, Zygmunt Jamrozik, Anna Potulska-Chromik, Barbara Jasińska-Myga, Grzegorz Opala, Anna Krygowska-Wajs, Krzysztof Czyzewski, Dennis W. Dickson, Jerzy Bal, Andrzej Friedman

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Objective: Mutations in the α-synuclein-encoding gene SNCA are considered as a rare cause of Parkinson's disease (PD). Our objective was to examine the frequency of the SNCA point mutations among PD patients of Polish origin. Methods: Detection of the known SNCA point mutations A30P (c.88G>C), E46K (c.136G>A) and A53T (c.157A>T) was performed either using the Sequenom MassArray iPLEX platform or by direct sequencing of the SNCA exons 2 and 3. As the two novel substitutions A18T (c.52G>A) and A29S (c.85G>T) were identified, their frequency in a control population of Polish origin was assessed and in silico analysis performed to investigate the potential impact on protein structure and function. Results: We did not observe the previously reported point mutations in the SNCA gene in our 629 PD patients; however, two novel potentially pathogenic substitutions A18T and A29S were identified. Each variant was observed in a single patient presenting with a typical late-onset sporadic PD phenotype. Although neither variant was observed in control subjects and in silico protein analysis predicts a damaging effect for A18T and pA29S substitutions, the lack of family history brings into question the true pathogenicity of these rare variants. Conclusions: Larger population based studies are needed to determine the pathogenicity of the A18T and A29S substitutions. Our findings highlight the possible role of rare variants contributing to disease risk and may support further screening of the SNCA gene in sporadic PD patients from different populations.

Original languageEnglish (US)
Pages (from-to)1057-1060
Number of pages4
JournalParkinsonism and Related Disorders
Volume19
Issue number11
DOIs
StatePublished - Nov 2013

Keywords

  • Genetic etiology
  • Missense mutations
  • Parkinson's disease
  • SNCA gene
  • α-Synuclein

ASJC Scopus subject areas

  • Neurology
  • Geriatrics and Gerontology
  • Clinical Neurology

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    Hoffman-Zacharska, D., Koziorowski, D., Ross, O. A., Milewski, M., Poznański, J., Jurek, M., Wszolek, Z. K., Soto-Ortolaza, A., Sławek, J., Janik, P., Jamrozik, Z., Potulska-Chromik, A., Jasińska-Myga, B., Opala, G., Krygowska-Wajs, A., Czyzewski, K., Dickson, D. W., Bal, J., & Friedman, A. (2013). Novel A18T and pA29S substitutions in α-synuclein may be associated with sporadic Parkinson's disease. Parkinsonism and Related Disorders, 19(11), 1057-1060. https://doi.org/10.1016/j.parkreldis.2013.07.011