Abstract
MLL/KMT2A amplifications and translocations are prevalent in infant, adult, and therapy-induced leukemia. However, the molecular contributor(s) to these alterations are unclear. Here, we demonstrate that histone H3 lysine 9 mono- and di-methylation (H3K9me1/2) balance at the MLL/KMT2A locus regulates these amplifications and rearrangements. This balance is controlled by the crosstalk between lysine demethylase KDM3B and methyltransferase G9a/EHMT2. KDM3B depletion increases H3K9me1/2 levels and reduces CTCF occupancy at the MLL/KMT2A locus, in turn promoting amplification and rearrangements. Depleting CTCF is also sufficient to generate these focal alterations. Furthermore, the chemotherapy doxorubicin (Dox), which associates with therapy-induced leukemia and promotes MLL/KMT2A amplifications and rearrangements, suppresses KDM3B and CTCF protein levels. KDM3B and CTCF overexpression rescues Dox-induced MLL/KMT2A alterations. G9a inhibition in human cells or mice also suppresses MLL/KMT2A events accompanying Dox treatment. Therefore, MLL/KMT2A amplifications and rearrangements are controlled by epigenetic regulators that are tractable drug targets, which has clinical implications.
Original language | English |
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Pages (from-to) | 4528-4545.e18 |
Journal | Cell |
Volume | 186 |
Issue number | 21 |
DOIs | |
State | Published - Oct 12 2023 |
Keywords
- Adult
- Animals
- Doxorubicin/pharmacology
- Epigenesis, Genetic
- Gene Rearrangement
- Histocompatibility Antigens
- Histone-Lysine N-Methyltransferase/genetics
- Humans
- Infant
- Jumonji Domain-Containing Histone Demethylases/genetics
- Leukemia/metabolism
- Lysine/metabolism
- Mice
- Myeloid-Lymphoid Leukemia Protein/genetics
- Translocation, Genetic
- KDM3B
- KMT2A
- DNA amplification
- CTCF
- MLL
- G9a
- doxorubicin
- H3K9me
- ecDNA
- rearrangements
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Dive into the research topics of 'Epigenetic balance ensures mechanistic control of MLL amplification and rearrangement'. Together they form a unique fingerprint.Press/Media
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Fox Chase Cancer Center Details Findings in Life Sciences (Epigenetic Balance Ensures Mechanistic Control Of Mll Amplification and Rearrangement)
Whetstine, J. R., Duy, C. & Skorski, T.
12/14/23
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Cell Culture Facility
Campbell, PhD, K. S. (Director) & Kwok, PhD, T. (Manager)
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Campbell, PhD, K. S. (Director), Font-Burgada, PhD, J. (Director), MacFarlane, PhD, A. (Manager) & Oesterling, BS, J. (Manager)
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