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Basic Science and Pathogenesis.

Natalia Valle-Tamayo1,2, Esther Álvarez-Sánchez1,2, Laia Muñoz1,2

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Summary
This summary is machine-generated.

Individuals with Down syndrome (DS) show altered peripheral immune cells, offering new insights into Alzheimer's disease (AD) progression. This study reveals immune system changes across AD stages in the DS population.

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Area of Science:

  • Immunology
  • Neuroscience
  • Genetics

Background:

  • Neuroinflammation is critical in neurodegenerative diseases like Alzheimer's disease (AD).
  • Individuals with Down syndrome (DS) have a high risk of developing AD (DSAD).
  • The role of the peripheral immune system in DS across the AD continuum remains uninvestigated at single-cell resolution.

Purpose of the Study:

  • To characterize peripheral blood mononuclear cells (PBMCs) in individuals with DS across AD stages using single-cell RNA sequencing (scRNA-seq).
  • To correlate immune profiling with AD biomarkers (Aβ1-42, Aβ1-40, pTau181, NfL).

Main Methods:

  • Single-cell RNA sequencing (scRNA-seq) and T-cell receptor sequencing of PBMCs.
  • Inclusion of 15 healthy controls and 46 individuals with DS (preclinical AD, prodromal AD, AD dementia).
  • Measurement of core AD biomarkers using the Simoa platform.

Main Results:

  • Anticipated identification of altered immune cell subpopulations and gene expression.
  • Expected discovery of changes in cell-cell communication patterns.
  • Anticipated detection of T-cell clonal expansion signatures associated with AD progression and pathology.

Conclusions:

  • This study integrates single-cell technologies with biomarker data in DS for comprehensive peripheral immune system analysis.
  • Provides novel insights into the peripheral immune system's role across AD stages in the DS population.
  • Highlights the unique insights gained from studying the DS population regarding AD pathology.