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Nuclear alpha-synuclein (aSyn) in Parkinson's disease (PD) disrupts gene expression. Its nuclear presence and phosphorylation at serine 129 influence toxicity and transcriptional deregulation, offering new therapeutic targets.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Alpha-synuclein (aSyn) is implicated in Parkinson's disease (PD) pathogenesis.
  • The role of nuclear aSyn in gene expression and its impact on PD remain largely unknown.

Purpose of the Study:

  • To investigate the mechanisms of aSyn-mediated transcriptional deregulation in the nucleus.
  • To assess the impact of aSyn phosphorylation and nuclear localization on gene expression and cellular toxicity.

Main Methods:

  • Investigated aSyn's effects in the nucleus, including its interaction with DNA.
  • Utilized aSyn with a nuclear localization signal (aSyn-NLS) to force nuclear presence.
  • Analyzed the impact of serine 129 phosphorylation on aSyn's nuclear dynamics and function.

Main Results:

  • aSyn induced significant transcriptional deregulation, downregulating cell cycle genes.
  • Transcriptional changes correlated with reduced aSyn binding to DNA.
  • Nuclear aSyn, particularly high molecular weight species and phosphorylation at serine 129, modulated gene expression and reduced toxicity.

Conclusions:

  • Nuclear aSyn presence and serine 129 phosphorylation status critically influence gene expression and cellular toxicity in PD.
  • Findings reveal a complex interplay between subcellular localization, phosphorylation, and aSyn pathogenicity.
  • This study opens new avenues for therapeutic strategies targeting Parkinson's disease and other synucleinopathies.