RNA expression changes in HOXA9/MEIS1 leukemia cells
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ABSTRACT: Aberrant expression of homeobox transcription factor HOXA9 is a central component of the leukemogenic program driven by diverse oncogenes. Here we show that HOXA9 overexpression in myeloid progenitor cells and pro-B cells leads to significant rearrangement of the epigenetic landscape with prominent emergence of cancer specific de novo enhancers. HOXA9 acts as a pioneer factor at the de novo enhancers and is required for recruitment of transcription factor CEBP/a and the histone H3K4 methyltransferase MLL3/MLL4 complex. HOXA9 function at the de novo enhancer is distinct from its physiological role at distal enhancers during normal hematopoietic development. Genetic deletion of MLL3/4 specifically affects the active enhancer signatures at de novo enhancers and inhibits HOXA9/MEIS1-mediated leukemogenesis. Our study reveals a previously uncharacterized role of HOXA9 and the MLL3/4 complex in leukemogenesis and provide mechanistic insights in epigenetic deregulation during malignant transformation.
ORGANISM(S): Mus musculus
PROVIDER: GSE103447 | GEO | 2018/09/05
REPOSITORIES: GEO
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