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Related Experiment Video

Updated: Sep 12, 2025

Primary Orthotopic Glioma Xenografts Recapitulate Infiltrative Growth and Isocitrate Dehydrogenase I Mutation
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Plot twist: TET2 clones save the brain.

Maria A Telpoukhovskaia1, Jennifer J Trowbridge1

  • 1The Jackson Laboratory, Bar Harbor, ME, USA.

Cell Stem Cell
|August 8, 2025
PubMed
Summary

Clonal hematopoiesis (CH) may protect against Alzheimer's disease (AD). This study reveals TET2-mutant CH, not DNMT3A-mutant CH, offers protection by impacting dementia pathology and cognition.

Area of Science:

  • Neuroscience
  • Hematology
  • Genetics

Background:

  • Clonal hematopoiesis (CH) is linked to reduced Alzheimer's disease (AD) risk.
  • Mechanisms underlying CH's protective effects against AD remain largely unknown.
  • Understanding these mechanisms is crucial for developing new AD therapies.

Purpose of the Study:

  • To investigate the specific mechanisms by which TET2-mutant and DNMT3A-mutant clonal hematopoiesis influence Alzheimer's disease pathology and cognitive function.
  • To differentiate the impact of different CH-associated mutations on neurodegeneration.

Main Methods:

  • Analysis of individuals with TET2 or DNMT3A mutations and varying degrees of clonal hematopoiesis.
  • Assessment of cognitive function and AD biomarkers.

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  • Examination of neuropathological hallmarks in relevant models.

    • Main Results:

    • TET2-mutant CH was associated with distinct impacts on dementia pathology and cognitive performance.
    • DNMT3A-mutant CH did not show the same protective association.
    • Specific molecular pathways influenced by TET2 mutations were identified.

    Conclusions:

    • TET2-mutant clonal hematopoiesis confers protection against Alzheimer's disease progression.
    • The findings highlight the differential roles of TET2 and DNMT3A mutations in CH-related neuroprotection.
    • This research opens avenues for targeted therapeutic strategies for AD.