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Basic Science and Pathogenesis.

Shinnosuke Yamada1, Huifangjie L Farsad1, Wei Feng2

  • 1Washington University School of Medicine, St. Louis, MO, USA.

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Researchers identified distinct dopamine neuron subtypes vulnerable in Parkinson disease (PD) and Lewy body dementias (LBDs). This study reveals molecular mechanisms behind selective neuronal vulnerability in the substantia nigra.

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Area of Science:

  • Neuroscience
  • Genomics
  • Pathology

Background:

  • Lewy body (LB) neuropathology characterizes Parkinson disease (PD), Parkinson disease dementia (PDD), and dementia with Lewy bodies (DLBD), collectively known as Lewy body dementias (LBDs).
  • LBDs and Alzheimer's disease (AD) are prevalent neurodegenerative dementias sharing protein deposition but differing in pathology and clinical presentation.

Purpose of the Study:

  • To investigate the molecular mechanisms of selective neuronal vulnerability in the substantia nigra (SN) across neurodegenerative dementias.
  • To compare neuronal subpopulations and gene dysregulation in PD, PDD, DLBD, and AD using single-nucleus RNA sequencing (snRNA-seq).

Main Methods:

  • Performed snRNA-seq on SN tissues from 45 subjects with AD, PD, PDD, DLBD, and cognitively normal controls.
  • Integrated and analyzed data with three published SN snRNA-seq datasets from PD, PDD, and control subjects.
  • Utilized MERFISH spatial transcriptomics and immunohistochemistry to assess neuronal distribution and vulnerability.

Main Results:

  • Identified 9 neuronal subpopulations, including SOX6+ and SOX6- dopamine (DA) neurons.
  • SOX6- DA neurons showed greater vulnerability and distinct ventral SN localization compared to SOX6+ DA neurons.
  • Differentially expressed gene analysis revealed overlapping DA neuron gene dysregulation in AD, PD, and LBDs, with opposite ALDH1A1 regulation in AD versus PD/LBDs.

Conclusions:

  • Reported spatial heterogeneity in cell composition and gene dysregulation within the human SN in PD and LBDs.
  • Unveiled molecular mechanisms contributing to selective neuronal and regional vulnerability in the SN.
  • Highlighted the distinct vulnerability of SOX6- DA neurons in PD and LBDs.