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Basic Science and Pathogenesis.

Felipe Luiz Pereira1, Caroline Lew2, Song Hua Li1

  • 1Memory and Aging Center, UCSF Weill Institute for Neurosciences, University of California, San Francisco, San Francisco, CA, USA.

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Researchers identified a specific excitatory neuron subtype vulnerable across Alzheimer's disease (AD) brain regions. This finding sheds light on the molecular mechanisms driving neuronal loss in various AD clinical presentations.

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Area of Science:

  • Neuroscience
  • Genomics
  • Pathology

Background:

  • Alzheimer's disease (AD) presents with diverse clinical syndromes, indicating region-specific neuronal vulnerability to tau pathology.
  • Distinct AD variants like amnestic AD, logopenic variant primary progressive aphasia (lvPPA), and posterior cortical atrophy (PCA) show tau accumulation in specific brain areas (CA1, STG, occipital cortex, respectively).
  • Understanding selective neuronal vulnerability is key to elucidating AD pathogenesis.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying region-specific neuronal vulnerability in Alzheimer's disease.
  • To identify vulnerable neuronal subpopulations by contrasting AD variants with distinct pathological hotspots.
  • To utilize single-nucleus RNA sequencing (snRNA-seq) to explore molecular drivers of neuronal susceptibility.

Main Methods:

  • Single-nucleus RNA sequencing (snRNA-seq) was performed on postmortem brain tissue from 68 individuals (24 amnestic AD, 11 lvPPA, 6 PCA, 27 controls).
  • Nuclei were extracted from CA1 hippocampal sector, posterior superior temporal gyrus (STG), and occipital cortex.
  • Bioinformatics analysis using Seurat in R identified neuronal subpopulations and assessed region-specific vulnerability using the Wald statistical test.

Main Results:

  • Over 1.58 million nuclei were analyzed, revealing 17 inhibitory and 16 excitatory neuronal subpopulations.
  • Six excitatory subpopulations (Exc-subs) demonstrated region-specific vulnerability.
  • A specific subpopulation, Ex L2/3 IT RORB GRIN1, showed significant vulnerability in CA1 (amnestic AD) and STG (amnestic and lvPPA cases), with a trend in the occipital cortex (PCA cases).

Conclusions:

  • A particular excitatory neuron subpopulation exhibits heightened susceptibility in tau-affected regions across amnestic and atypical AD syndromes.
  • These findings highlight a common vulnerable neuronal subtype contributing to diverse AD clinical presentations.
  • Further quantitative pathology and case analyses are planned to validate findings and refine understanding of AD's molecular drivers.