Identification of a dynamic core transcriptional network in t(8;21) AML that regulates differentiation block and self-renewal.
Cell Rep 2014;
8:1974-1988. [PMID:
25242324 PMCID:
PMC4487811 DOI:
10.1016/j.celrep.2014.08.024]
[Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 06/19/2014] [Accepted: 08/12/2014] [Indexed: 11/29/2022] Open
Abstract
Oncogenic transcription factors such as RUNX1/ETO, which is generated by the chromosomal translocation t(8;21), subvert normal blood cell development by impairing differentiation and driving malignant self-renewal. Here, we use digital footprinting and chromatin immunoprecipitation sequencing (ChIP-seq) to identify the core RUNX1/ETO-responsive transcriptional network of t(8;21) cells. We show that the transcriptional program underlying leukemic propagation is regulated by a dynamic equilibrium between RUNX1/ETO and RUNX1 complexes, which bind to identical DNA sites in a mutually exclusive fashion. Perturbation of this equilibrium in t(8;21) cells by RUNX1/ETO depletion leads to a global redistribution of transcription factor complexes within preexisting open chromatin, resulting in the formation of a transcriptional network that drives myeloid differentiation. Our work demonstrates on a genome-wide level that the extent of impaired myeloid differentiation in t(8;21) is controlled by the dynamic balance between RUNX1/ETO and RUNX1 activities through the repression of transcription factors that drive differentiation.
RUNX1/ETO drives a t(8;21)-specific transcriptional network
RUNX1/ETO and RUNX1 dynamically compete for the same genomic sites
RUNX1/ETO targets transcription factor complexes that control differentiation
RUNX1/ETO depletion activates a transcriptional network dominated by C/EBPα
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