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The NCOR-HDAC3 co-repressive complex modulates the leukemogenic potential of ERG.

ABSTRACT: The ETS transcription factor ERG is involved in several cancers including leukemia. However, ERG domains and co-factors involved in leukemogenesis remain largely uncharacterized and as a transcription factor it is currently undruggable. Here, we report a critical role for the conserved amino-acid proline at position 199, at the 3’ end of the PNT domain, for ERG’s leukemogenic activity. Specifically, we demonstrate that it is required for ERG-induced self-renewal and restriction of myeloid differentiation in hematopoietic progenitor cells and for initiation of leukemia in mouse transduction/transplantation models. Mechanistically, we show that P199 facilitates the interaction of ERG with the NCoR-HDAC3 co-repressor complex. Inhibition of HDAC3 reduced in vitro and in vivo growth of human ERG-dependent leukemic cells as well as growth of ERG dependent prostate cancer cells. Thus, the interaction of ERG with the NCoR-HDAC3 co-repressor complex is required for its oncogenic activity and modulation of this interaction may provide an opportunity for therapeutic intervention.

ORGANISM(S): Mus musculus

PROVIDER: GSE200391 | GEO | 2023/05/26

REPOSITORIES: GEO

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The NCOR-HDAC3 co-repressive complex modulates the leukemogenic potential of ERG.

Project description:The ETS transcription factor ERG is involved in several cancers including leukemia. However, ERG domains and co-factors involved in leukemogenesis remain largely uncharacterized and as a transcription factor it is currently undruggable. Here, we report a critical role for the conserved amino-acid proline at position 199, at the 3’ end of the PNT domain, for ERG’s leukemogenic activity. Specifically, we demonstrate that it is required for ERG-induced self-renewal and restriction of myeloid differentiation in hematopoietic progenitor cells and for initiation of leukemia in mouse transduction/transplantation models. Mechanistically, we show that P199 facilitates the interaction of ERG with the NCoR-HDAC3 co-repressor complex. Inhibition of HDAC3 reduced in vitro and in vivo growth of human ERG-dependent leukemic cells as well as growth of ERG dependent prostate cancer cells. Thus, the interaction of ERG with the NCoR-HDAC3 co-repressor complex is required for its oncogenic activity and modulation of this interaction may provide an opportunity for therapeutic intervention.

2023-05-26 | GSE200392 | GEO

The NCOR-HDAC3 co-repressive complex modulates the leukemogenic potential of ERG.

2023-05-26 | GSE200389 | GEO

Separation of transcriptional repressor and activator functions in HDAC3 [CUT&TAG]

Project description:The histone deacetylase HDAC3 is associated with the NCoR/SMRT co-repressor complex and its canonical function is in transcriptional repression, but it can also activate transcription. Here we show that the repressor and activator functions of HDAC3 can be genetically separated in Drosophila. A lysine substitution in the N-terminus (K26A) disrupts its catalytic activity and activator function, whereas a combination of substitutions (HEBI) abrogating the interaction with SMRTER enhance repressor activity beyond wild-type in the early embryo. We conclude that the critical functions of HDAC3 in embryo development involve catalytic-dependent gene activation and non-enzymatic repression by several mechanisms, including tethering of loci to the nuclear periphery.

2023-06-15 | GSE206248 | GEO

Separation of transcriptional repressor and activator functions in HDAC3 [RNA-Seq]

2023-06-15 | GSE206247 | GEO

NCoR/SMRT co-repressors cooperate with c-MYC to create an epigenetic barrier to somatic cell reprogramming [ChIP-Seq]

Project description:Changing the somatic cell transcriptome to a pluripotent state using exogenous reprogramming factors needs transcriptional co-regulators that help activate or suppress gene expression and rewrite the epigenome. Here, we show that reprogramming-specific engagement of the NCoR/SMRT co-repressor complex at key pluripotency loci creates an epigenetic block to reprogramming. HDAC3 executes the repressive function of NCoR/SMRT in reprogramming by inducing histone deacetylation at these loci. Recruitment of NCoR/SMRT-HDAC3 to pluripotency genes is facilitated by all 4 Yamanaka factors (OCT4, SOX2, KLF4 and c-MYC) but mostly by c-MYC. Class IIa HDACs further potentiate this recruitment by interacting with both the reprogramming factors and NCoR/SMRT. Consequently, depleting NCoR/SMRT-HDAC3 function enables high efficiency of reprogramming, while elevating NCoR/SMRT-HDAC3 recruitment at pluripotency loci by over-expressing constitutively active class IIa HDACs derails it. Our findings thus uncover an unexpected epigenetic mechanism involving c-MYC, whose manipulation greatly enhances reprogramming efficiency.

2018-03-07 | GSE70736 | GEO

NCoR/SMRT co-repressors cooperate with c-MYC to create an epigenetic barrier to somatic cell reprogramming [RNA-seq]

2018-03-07 | GSE70738 | GEO

CDDP treatment of U2OS cells with NCOR and SMRT knock-down

Project description:We detected an interaction between checkpoint kinase Chk2 and some members of the NCOR/SMRT co-repressor complex. In order to study the role of gene repression in the checkpoint response to DNA damage, we performed RNA profiling in NCOR or SMRT knockdown cells after treztment with cisplatin. U2OS cells were transfected with siRNAs for NCOR or SMRT, grown for 2 days in complete medium, and then treated with 100 microM cisplatin (CDDP) for 6h. Biological duplicates were used for RNa profiling

2012-02-06 | E-GEOD-34226 | biostudies-arrayexpress

CDDP treatment of U2OS cells with NCOR and SMRT knock-down

2012-02-06 | GSE34226 | GEO

TMPRSS2-ERG, HDACs and EZH2 are involved in an AR-centric transcriptional circuitry that calibrates androgenic response for prostate cancer progression (ChIP-Seq data)

Project description:Deregulation of the Androgen Receptor (AR) transcriptional network is a common hallmark in prostate cancers. To achieve its precise transcriptional role, AR needs to co-operate specifically with a plethora of cofactors. In prostate cancers, AR transcription collaborators are frequently aberrantly over-expressed, altering the AR signaling pathway to one that promotes oncogenesis. Recently, the prostate cancer recurrent fusion gene, ERG, was shown to promote tumor progression by acting as a repressor of AR signaling. However, the exact mechanics and the functional consequences associated with this crosstalk between ERG and AR still remains relatively unknown. Interestingly, through chromatin immunoprecipitation coupled with massively parallel sequencing, we discover that ERG and other commonly over-expressed transcriptional co-repressors (HDAC1, HDAC2, HDAC3 and EZH2) are wired into an AR-centric transcriptional network via a spectrum of distal enhancers and/or proximal promoters. We show that ERG represses several AR target genes involved in epithelial differentiation. Furthermore, we demonstrated that suppression of the androgen-induced gene, Vinculin, by ERG and histone deacetylases increases cancer cell invasiveness. From our results, we propose that ERG, histone deactelyases and the histone methyltransferase, EZH2, could impede epithelial differentiation and contribute to prostate cancer progression, in part through modulating the transcriptional output of AR. Genome-wide binding analysis of AR, ERG, HDAC1, HDAC2, HDAC3 and EZH2 in VCaP with and without DHT (dihydrotestosterone) stimulation using ChIP-Seq. 15 samples including 1 control (input).

2012-04-26 | E-GEOD-28950 | biostudies-arrayexpress

Genome-wide location analysis of SMRT and NCoR in wild-type and Bcl6 knockout macrophages

Project description:Using ChIP-seq, we reveal the SMRT and NCoR co-repressor cistromes, which each consist of over 30,000 half-shared binding sites. Moreover, we identify Bcl6-bound sub-cistromes for each co-repressor, which are strongly concentrated on NF-κB-driven inflammatory and tissue remodeling genes. These results reveal a critical role for Bcl6 and its corepressors SMRT and NCoR in the prevention of atherosclerosis and chronic inflammation. Identification of SMRT and NCoR binding sites in wild-type and Bcl6 knockout primary bone-marrow derived macrophages

2012-03-29 | E-GEOD-27033 | biostudies-arrayexpress

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