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Genetics of Synucleinopathies.

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Alpha-synuclein protein is central to synucleinopathies like Parkinson's disease (PD) and diffuse Lewy body disease (DLBD), with genetic links and Lewy body pathology. Multiple system atrophy (MSA) shows distinct features despite alpha-synuclein aggregation.

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Area of Science:

  • Neuroscience
  • Genetics
  • Pathology

Background:

  • Parkinson's disease (PD), diffuse Lewy body disease (DLBD), and multiple system atrophy (MSA) are synucleinopathies linked to alpha-synuclein.
  • PD and DLBD share clinical and pathological similarities, while MSA presents distinct characteristics.

Purpose of the Study:

  • To review the genetic and pathological evidence connecting alpha-synuclein to PD, DLBD, and MSA.
  • To explore the role of alpha-synuclein gene (SNCA) mutations and variations in disease development.
  • To discuss the emerging concept of alpha-synuclein strains in explaining disease heterogeneity.

Main Methods:

  • Review of genetic studies, including point and copy number mutations in the SNCA gene.
  • Analysis of genome-wide association studies (GWAS) for SNCA variants in sporadic PD.
  • Examination of pathological findings, including alpha-synuclein aggregation in Lewy bodies and oligodendroglial cells.

Main Results:

  • SNCA mutations are linked to hereditary PD and DLBD, with copy number variations showing a dosage effect.
  • Common SNCA variants are associated with sporadic PD risk, potentially through altered alpha-synuclein expression.
  • Alpha-synuclein is a key component of Lewy bodies in PD/DLBD, but genetic links to MSA are weaker despite its aggregation in MSA.

Conclusions:

  • Alpha-synuclein plays a critical role in PD and DLBD pathogenesis.
  • Disease phenotypes in synucleinopathies may arise from SNCA mutations, expression levels, and the formation of distinct alpha-synuclein strains.
  • Further research into alpha-synuclein strains is crucial for understanding the diverse clinical and pathological features of synucleinopathies.