Abstract
Pharmacologic inhibition of LSD1 promotes blast cell differentiation in acute myeloid leukemia (AML) with MLL translocations. The assumption has been that differentiation is induced through blockade of LSD1’s histone demethylase activity. However, we observed that rapid, extensive drug-induced changes in
transcription occurred without genome-wide accumulation of the histone modifications targeted for demethylation by LSD1 at sites of LSD1 binding, and that a demethylase-defective mutant rescued LSD1 knockdown AML cells as efficiently as wild-type protein. Rather, LSD1 inhibitors disrupt the interaction of
LSD1 and RCOR1 with the SNAG-domain transcription repressor GFI1 which is bound to a discrete set of enhancers located close to transcription factor genes which regulate myeloid differentiation. Physical separation of LSD1/RCOR1 from GFI1 is required for drug-induced differentiation. The consequent inactivation of GFI1 leads to increased enhancer histone acetylation within hours which directly correlates with up regulation of nearby, subordinate genes.
transcription occurred without genome-wide accumulation of the histone modifications targeted for demethylation by LSD1 at sites of LSD1 binding, and that a demethylase-defective mutant rescued LSD1 knockdown AML cells as efficiently as wild-type protein. Rather, LSD1 inhibitors disrupt the interaction of
LSD1 and RCOR1 with the SNAG-domain transcription repressor GFI1 which is bound to a discrete set of enhancers located close to transcription factor genes which regulate myeloid differentiation. Physical separation of LSD1/RCOR1 from GFI1 is required for drug-induced differentiation. The consequent inactivation of GFI1 leads to increased enhancer histone acetylation within hours which directly correlates with up regulation of nearby, subordinate genes.
Original language | English |
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Pages (from-to) | 3641-3659 |
Number of pages | 19 |
Journal | Cell Reports |
Volume | 22 |
Issue number | 13 |
Early online date | 27 Mar 2018 |
DOIs | |
Publication status | Published - 27 Mar 2018 |
Keywords
- GFI1
- LSD1
- MLL
- acetylation
- acute myeloid leukemia
- methylation
Research Beacons, Institutes and Platforms
- Manchester Cancer Research Centre