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Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
Published on: September 1, 2019
Alternative Runx1 promoter usage in mouse developmental hematopoiesis
Thomas Bee1, Kate Liddiard, Gemma Swiers
1MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford, UK.
Blood Cells, Molecules & Diseases
|May 26, 2009
Summary
Understanding hematopoietic stem cell (HSC) generation requires studying the transcription factor Runx1. This study reveals how alternative Runx1 promoters are used during HSC development in mice.
Area of Science:
- Developmental biology
- Hematopoiesis
- Molecular biology
Background:
- Stem cell therapies necessitate understanding stem cell generation and maintenance.
- Hematopoietic stem cells (HSCs) originate in mammalian embryonic arteries.
- The transcription factor Runx1 is crucial for HSC generation and is expressed at HSC generation sites.
Purpose of the Study:
- To investigate the transcriptional regulation of Runx1 during HSC emergence.
- To analyze the usage of Runx1 P1 and P2 alternative promoters in mouse hematopoietic development.
Main Methods:
- Systematic analysis of Runx1 P1 and P2 promoter usage.
- Examination in hematopoietic sites and sorted cell populations during mouse development.
Main Results:
- Runx1 expression in primitive erythrocytes is mainly P2-derived.
- Both P1 and P2 promoters are active in definitive HSCs/progenitors from yolk sac, AGM, and associated arteries.
- The P1 promoter becomes dominant in the fetal liver and remains so into adulthood.
- A novel P2-derived Runx1 isoform was identified.
Conclusions:
- Runx1 promoter usage shifts dynamically during hematopoietic stem cell development.
- Alternative promoter usage contributes to the precise regulation of Runx1 expression essential for HSC emergence and maintenance.
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