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Parkinsonism due to A53E α‐synuclein gene mutation: Clinical, genetic, epigenetic, and biochemical features
Author(s) -
Picillo Marina,
Lizarraga Karlo J.,
Friesen Erik L.,
Chau Hien,
Zhang Ming,
Sato Christine,
Rooke Grace,
Munhoz Renato P.,
Rogaeva Ekaterina,
Fraser Paul E.,
Kalia Suneil K.,
Kalia Lorraine V.
Publication year - 2018
Publication title -
movement disorders
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.352
H-Index - 198
eISSN - 1531-8257
pISSN - 0885-3185
DOI - 10.1002/mds.27506
Subject(s) - parkinsonism , epigenetics , genetics , dna methylation , biology , mutation , haplotype , disease , gene , medicine , allele , gene expression
ABSTRACT Background SNCA mutations cause autosomal dominant parkinsonism and inform our understanding of the molecular underpinnings of synucleinopathies. The most recently identified mutation, p.Ala53Glu (A53E), has only been observed in Finland. The objectives of this study were to examine clinical, genetic, epigenetic, and biochemical features of the first family outside Finland with A53E. Methods We examined a Canadian family with parkinsonism because of A53E using haplotype and DNA methylation analyses. We assessed aggregation properties of A53E α‐synuclein in vitro . Results Family members with parkinsonism shared a common haplotype distinct from Finnish patients with A53E. Increased acceleration of DNA methylation age was accompanied by earlier age at onset in the family members. We demonstrate that A53E α‐synuclein has a propensity to form oligomers and phosphorylation promotes fibrillation. Conclusions A53E as a cause of parkinsonism is not restricted to Finnish individuals. DNA methylation may contribute to disease age at onset. A53E enriches α‐synuclein oligomers and fibrils dependent on the phosphorylation state. © 2018 International Parkinson and Movement Disorder Society