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Basic Science and Pathogenesis.

Amanda McQuade1

  • 1UCSF, San Francisco, CA, USA.

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|December 23, 2025
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Summary
This summary is machine-generated.

Researchers identified novel regulators of Interferon-Responsive Microglia (IRM), a toxic state implicated in Alzheimer's disease (AD). Targeting these regulators may offer new therapeutic strategies for AD by modulating microglial responses.

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Area of Science:

  • Neuroscience
  • Immunology
  • Genetics

Background:

  • Microglia play a critical role in Alzheimer's disease (AD) pathogenesis.
  • Interferon-Responsive Microglia (IRM) represent a detrimental activation state linked to neuroinflammation and synaptic loss in AD.
  • Identifying negative regulators of IRM is crucial for developing AD therapeutics.

Purpose of the Study:

  • To uncover novel regulators of the Interferon-Responsive Microglia (IRM) state.
  • To identify therapeutic targets for mitigating microglial dysfunction in Alzheimer's disease (AD).

Main Methods:

  • Conducted a genome-wide CRISPR interference screen targeting IFIT1 expression in human iPSC-derived microglia.
  • Utilized IFNβ pre-stimulation to enrich for negative regulators of the IRM state.
  • Investigated mechanisms of IRM inhibition, focusing on nucleic acid sensing pathways.

Main Results:

  • Discovered both known and novel regulators of interferon signaling, including RNA processing and DNA methylation pathways.
  • Demonstrated that identified regulators specifically inhibit the IRM state without broadly impairing beneficial microglial responses.
  • Converged on nucleic acid sensing as a key mechanism underlying the inhibition of interferon-responsive microglia.

Conclusions:

  • Accumulation of cytoplasmic nucleic acids is an early pathogenic marker in AD.
  • Novel regulators of nucleic acid sensing and the interferon-responsive state were identified using iPSC-derived microglia and CRISPR screening.
  • These findings support the development of targeted therapies to inhibit IRM and restore protective microglial functions in AD.