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Control of developmentally primed erythroid genes by combinatorial corepressor actions

ABSTRACT: How transcription factors (TFs) cooperate within large protein complexes to allow rapid modulation of gene expression during development is still largely unknown. Here we show that the key haematopoietic LIM-domain-binding protein-1 (LDB1) TF complex contains several activator and repressor components that together maintain an erythroid-specific gene expression programme primed for rapid activation until differentiation is induced. A combination of proteomics, functional genomics and in vivo studies presented here identifies known and novel co-repressors, most notably the ETO2 and IRF2BP2 proteins, involved in maintaining this primed state. The ETO2–IRF2BP2 axis, interacting with the NCOR1/SMRT co-repressor complex, suppresses the expression of the vast majority of archetypical erythroid genes and pathways until its decommissioning at the onset of terminal erythroid differentiation. Our experiments demonstrate that multimeric regulatory complexes feature a dynamic interplay between activating and repressing components that determines lineage-specific gene expression and cellular differentiation.

ORGANISM(S): Mus musculus

PROVIDER: GSE59859 | GEO | 2015/11/19

SECONDARY ACCESSION(S): PRJNA256961

REPOSITORIES: GEO

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Control of developmentally primed erythroid genes by combinatorial corepressor actions

Project description:How transcription factors (TFs) cooperate within large protein complexes to allow rapid modulation of gene expression during development is still largely unknown. Here we show that the key haematopoietic LIM-domain-binding protein-1 (LDB1) TF complex contains several activator and repressor components that together maintain an erythroid-specific gene expression programme primed for rapid activation until differentiation is induced. A combination of proteomics, functional genomics and in vivo studies presented here identifies known and novel co-repressors, most notably the ETO2 and IRF2BP2 proteins, involved in maintaining this primed state. The ETO2â??IRF2BP2 axis, interacting with the NCOR1/SMRT co-repressor complex, suppresses the expression of the vast majority of archetypical erythroid genes and pathways until its decommissioning at the onset of terminal erythroid differentiation. Our experiments demonstrate that multimeric regulatory complexes feature a dynamic interplay between activating and repressing components that determines lineage-specific gene expression and cellular differentiation. ChIP-Sequencing profiles of the IRF2BP2, GFI1B and LSD1 proteins were generated using mouse erythroleukemia (MEL) cells. RNA-seq experiments of Irf2bp2-WT, Irf2bp2-KD, Eto2-WT, Eto2-KD, Gfi1b-WT, Gfi1b-KD, Lsd1-WT, Lsd1-KD, MEL-non-induced, and MEL-induced stages were performed using standard RNA-seq protocol. Illumina HiSeq 2000 (standard TruSeq RNA sequencing protocol) was used for the sequencing.

2015-11-19 | E-GEOD-59859 | biostudies-arrayexpress

Distinct Ldb1/NLI complexes orchestrate γ-globin repression and re-activation through ETO2 in human adult erythroid cells.

Project description:The Ldb1/GATA-1/TAL1/LMO2 complex mediates long range interaction between the β-globin locus control region (LCR) and gene in adult mouse erythroid cells but whether this complex mediates chromatin interactions at other developmental stages or in human cells is unknown. We investigated human NLI (Ldb1 homologue) complex occupancy and chromatin conformation of the β-globin locus in human erythroid cells. In addition to the LCR, we find robust NLI complex occupancy at a site downstream of the Aγ-globin gene, within sequences of BGL3, an intergenic RNA transcript. In cells primarily transcribing β-globin, BGL3 is not transcribed and BGL3 sequences are occupied by NLI core complex members together with co-repressor ETO2 and γ-globin repressor BCL11A. The LCR and β-globin gene establish proximity in these cells. In contrast, when γ-globin transcription is re-activated by cytokines in these cells, ETO2 participation in the NLI complex at BGL3 is diminished, as is BCL11A occupancy, and both BGL3 and γ-globin are transcribed. In these cells, proximity between the BGL3/γ-globin region and the LCR is established. Thus, alternative NLI complexes mediate γ-globin transcription or silencing through long range LCR interactions involving an intergenic site of non-coding RNA transcription and ETO2 is critical to this process. ChIP-chip of GATA-1, NLI, and pol II in cell lines Comparison of GATA-1, NLI, and pol II binding on chromatin. 2 replicates for each protein; ChIP and input DNA for each replicate

2012-01-05 | E-GEOD-30047 | biostudies-arrayexpress

Distinct Ldb1/NLI complexes orchestrate γ-globin repression and re-activation through ETO2 in human adult erythroid cells.

2012-01-05 | GSE30047 | GEO

Embryonic erythropoiesis and hemoglobin switching require transcriptional repressor ETO2 to modulate chromatin accessibility and looping (RNA-Seq)

Project description:ETO2 functions as a transcription repressor and is required for the embryonic erythropoiesis and the hemoglobin switch. To gain insight into ETO2 regulatory function during human erythropoiesis, we performed RNA-seq for WT and ETO2 KO K562 cells and found that up-regulated genes upon ETO2 loss in human cells included many markers of mature erythroid cells EPB42, ALAS2, GYPA and SLC25a37. Notably, the α-globin genes (HBA1, HBA2 and HBZ) and embryonic and fetal β-globin genes (HBE1, HBG1, and HBG2) were significantly increased after deletion of ETO2. By contrast, deletion of ETO2 down-regulated the transcription factor genes (ETS1, KLF8 and SOX6) which play a negative role in globin gene expression and hemoglobin synthesis. To further explore different domain function of ETO2, we have analyzed our RNA-seq data from domain deletion cell lines compared to the cell line expressing wild type ETO2. Generally, 702 genes were found to co-regulated by three domain function of ETO2. Interestingly, the regulation of fetal globin genes, erythroid regulator (SOX5) as well as epigenetic factor (HDAC7) is required by three domain function of ETO2. During mouse embryonic erythropoiesis, our FACS-sorted and normal RNA-seq data in E14.5 fetal liver cells indicated that eto2 promoted a critical developmental transition and played an important role in globin switch from embryonic to adult β-globin transcription since its function is essential for key regulators (PU.1, BCL11A and ZBTB7A) and globin genes (Hbb-y and Hba-x) regulation.

2020-08-25 | GSE142226 | GEO

The NFIA-ETO2 fusion blocks terminal erythroid maturation and induces pure erythroid leukemia (PEL)

Project description:The NFIA-ETO2 fusion is the product of a t(1;16)(p31;q24) chromosomal translocation so far exclusively found in pediatric patients with pure erythroid leukemia (PEL). To address its role for the pathogenesis of the pure erythroid leukemia, we retrovirally expressed the PEL-associated NFIA-ETO2 fusion in primary erythroblasts in fetal liver-derived erythroblasts from wild-type (C57/B6) mice. To better characterize alteration in chromatin accessibility due to NFIA-ETO2 expression, we analyzed accessible chromatin state by ATAC sequencing from cells kept in 24h in differentiation-inducing medium (DM)

2023-02-08 | GSE205392 | GEO

Effect of NFIA-ETO2 gene fusion on MEL cells during proliferation and impaired erythroid differentiation.

2023-02-09 | GSE205407 | GEO

The NFIA-ETO2 fusion blocks terminal erythroid maturation and induces pure erythroid leukemia (PEL) in cooperation with mutant TP53

Project description:The NFIA-ETO2 fusion is the product of a t(1;16)(p31;q24) chromosomal translocation so far exclusively found in pediatric patients with pure erythroid leukemia (PEL). To address its role for the pathogenesis of the pure erythroid leukemia, we retrovirally expressed the PEL-associated NFIA-ETO2 fusion or an in active NFIA-ETOdeltaNHR4 mutant in primary erythroblasts in fetal liver-derived erythroblasts from either wild-type (C57/B6) or TP53R248Q (HUPKI) mice. Gene expression was determined by RNA sequencing from cells kept in maintenance medium (MM) or 24h in differentiation-inducing medium (DM)

2023-02-09 | GSE205420 | GEO

Location of NFIA-ETO2 binding site on genome in MEL cells

Project description:The NFIA-ETO2 fusion is the product of a t(1;16)(p31;q24) chromosomal translocation so far exclusively found in pediatric patients with pure erythroid leukemia (PEL). To address its role for the pathogenesis of the pure erythroid leukemia, we retrovirally expressed the PEL-associated NFIA-ETO2 fusion in MEL cells. To better identify direct target gene loci, we sequenced NFIA-ETO2-associated immunoprecipitated chromatin and histone modifications.

2023-02-09 | GSE205397 | GEO

cDNA microarray expression data of heart, skeletal muscle and liver comparing Irf2bp2-null mice to wild type controls

Project description:Interferon regulatory factor 2 binding protein 2 (Irf2bp2), a co-repressor of Irf2, is required for fetal hepatic erythropoiesis through the expansion of erythromyeloid progenitors. Mice with germline ablation of the entire Irf2bp2 transcript produced no viable Irf2bp2-null (knockout, KO) pups in first litters. In subsequent litters, fewer than 1/3 of the expected KO pups were born and half survived to adulthood. Heart, skeletal muscle and liver tissues (tissues with high Irf2bp2 expression) were acquired from WT and KO mice, followed by RNA extraction using the RNeasy Midi Kit and subsequent gene expression profiling using the Affymetrix Mouse Gene 1.0 ST v1 array. Transcriptome profiles of surviving KO mice were contrasted to WT mice giving insight to modified gene expression in the absence of Irf2bp2 across multiple vital tissues.

2023-02-02 | E-MTAB-11558 | biostudies-arrayexpress

Expression data from ETO2 knockdown G1E-ER-GATA-1 cells

Project description:We used microarrays to examine what genes could be regulated by ETO2 in erythroid cells. Comparing expression profile in murine G1E-ER-GATA-1 cells treated with control and ETO2(Cbfa2t3) siRNA on Agilent array. After siRNA transfection, the cells were treated with b-estradiol for 24h to induce GATA-1-mediated erythroid maturation.

2010-09-25 | E-GEOD-24333 | biostudies-arrayexpress

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