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Updated: May 24, 2026

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
Published on: September 1, 2019
A RUNX2-HDAC1 co-repressor complex regulates rRNA gene expression by modulating UBF acetylation
Syed A Ali1, Jason R Dobson, Jane B Lian
1Department of Cell Biology and Cancer Center, University of Massachusetts Medical School, Worcester, MA 01655, USA.
RUNX2 recruits HDAC1 to suppress rRNA transcription in bone cells. Depleting HDAC1 relieves this repression, boosting cell proliferation and protein synthesis.
Area of Science:
- Molecular Biology
- Epigenetics
- Cell Biology
Background:
- RUNX2, a transcription factor, regulates osteogenesis and oncogenesis.
- RUNX2 suppresses RNA polymerase I (RNA Pol I)-mediated rRNA transcription.
- Mechanisms of RUNX2-mediated rRNA transcription suppression are unclear.
Purpose of the Study:
- To elucidate the mechanism by which RUNX2 suppresses rRNA transcription.
- To investigate the role of RUNX2 cofactors, specifically histone deacetylases (HDACs).
Main Methods:
- Investigated RUNX2 recruitment of HDAC1 to rDNA repeats in osseous cells.
- Analyzed histone modifications and protein upstream binding factor (UBF) deacetylation.
- Assessed effects of RUNX2 and HDAC1 depletion on rRNA gene expression and cell function.
Main Results:
- RUNX2 recruits HDAC1 to rDNA repeats, altering histone modifications and deacetylating UBF.
- RUNX2 downregulation reduces HDAC1 localization and its association with UBF.
- HDAC1 depletion reverses RUNX2-mediated rRNA gene repression, increasing cell proliferation and protein synthesis.
Conclusions:
- Identified a RUNX2-HDAC1-dependent mechanism regulating rRNA transcription in bone cells.
- Demonstrated plasticity in RUNX2 epigenetic control via co-regulatory factor exclusion.
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