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Related Concept Videos

Alzheimer's Disease: Overview01:26

Alzheimer's Disease: Overview

887
Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...
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  9. Central Nervous System
  11. Single-cell Multiregion Dissection Of Alzheimer's Disease

Single-cell multiregion dissection of Alzheimer's disease

Hansruedi Mathys1,2,3,4, Carles A Boix5,6,7, Leyla Anne Akay1,2

  • 1Picower Institute for Learning and Memory, MIT, Cambridge, MA, USA.

Nature
|July 24, 2024

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Full- versus Sub-Regional Quantification of Amyloid-Beta Load on Mouse Brain Sections
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Isolation of Region-specific Microglia from One Adult Mouse Brain Hemisphere for Deep Single-cell RNA Sequencing
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View abstract on PubMed

Summary
This summary is machine-generated.

This study maps 1.3 million cells in the aged human brain, revealing Alzheimer's disease impacts on specific neuron types and identifying astrocyte pathways linked to cognitive resilience.

Area of Science:

  • Neuroscience
  • Genomics
  • Cell Biology

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Background:

  • Alzheimer's disease (AD) is a leading cause of dementia, yet its cellular mechanisms across brain regions are not fully understood.
  • A comprehensive understanding of cell-type-specific alterations in the aged human brain is crucial for deciphering AD pathogenesis.

Purpose of the Study:

  • To create a single-cell transcriptomic atlas of six brain regions in the aged human brain.
  • To identify cell types and pathways affected by Alzheimer's disease pathology.
  • To uncover mechanisms of cognitive resilience in the context of AD.

Main Methods:

  • Generated a single-cell transcriptomic atlas from 283 post-mortem human brain samples (48 individuals).
  • Analyzed 1.3 million cells across six brain regions from individuals with and without Alzheimer's disease.
  • Developed a scalable method for discovering and annotating cell-type- and region-specific gene modules altered in AD.

Main Results:

  • Identified 76 distinct cell types, including novel astrocyte and excitatory neuron subtypes and a unique thalamic interneuron population.
  • Discovered vulnerable excitatory and inhibitory neuron populations depleted in specific brain regions in AD, implicating the Reelin signaling pathway.
  • Uncovered an astrocyte gene expression program associated with cognitive resilience, linking choline metabolism and polyamine biosynthesis to preserved cognitive function.

Conclusions:

  • The study provides a detailed regional atlas of the aging human brain at single-cell resolution.
  • Identified specific cellular vulnerabilities and resilience mechanisms in Alzheimer's disease.
  • Offers insights into the molecular underpinnings of cognitive function and decline in aging and AD.