Hematopoiesis under telomere attrition at the single-cell resolution
Natthakan Thongon1, Feiyang Ma2, Andrea Santoni1
1Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
Nature Communications
|November 26, 2021
Summary
Telomere shortening exhausts hematopoietic stem cells via innate immune activation, not apoptosis. Targeting IFI16 signaling with A151 restores stem cell function and self-renewal.
Area of Science:
- Hematology
- Molecular Biology
- Immunology
Background:
- Hematopoietic stem cell (HSC) functional decline is linked to telomere shortening.
- Existing hypotheses suggest apoptosis, autophagy, or senescence limit HSC proliferation under telomere attrition.
Purpose of the Study:
- To investigate the molecular mechanisms of HSC dysfunction during telomere attrition.
- To redefine the transcriptional and epigenetic landscape of HSCs with telomere shortening.
- To explore therapeutic strategies targeting IFI16 signaling.
Main Methods:
- Single-cell technologies applied to mouse and human HSCs with telomere attrition.
- Analysis of transcriptional and epigenetic changes.
- Intervention using oligodeoxynucleotide A151 targeting cytosolic DNA sensors.
Main Results:
- Telomere attrition induces metabolic activation and megakaryocytic differentiation in HSCs.
- Upregulation of innate immune signaling compromises HSC self-renewal, leading to exhaustion.
- Oligodeoxynucleotide A151 inhibits interferon signaling and corrects skewed differentiation in telomere-dysfunctional HSCs.
Conclusions:
- Telomere attrition exhausts HSCs through innate immune activation and skewed differentiation, challenging prior hypotheses.
- Targeting the IFI16 signaling axis with A151 can prevent HSC functional decline in telomere maintenance disorders.
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