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Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML [ChIP-seq]

ABSTRACT: The overexpression of the ecotropic viral integration site-1 gene (EVI1/MECOM) marks the most lethal acute myeloid leukemia (AML) subgroup carrying chromosome 3q26 abnormalities. By taking advantage of the intersectionality of high-throughput cell-based and gene expression screens, we identified selective and pan-histone deacetylase inhibitors (HDACis) as potent repressors of EVI1. To understand the mechanism driving on-target anti-leukemia activity of this compound class, we dissected the expression dynamics of the bone marrow leukemia cells of patients treated with HDACi and reconstituted the EVI1 chromatin-associated co-transcriptional complex merging on the role of proliferation-associated 2G4 protein. PA2G4 overexpression rescues AML cells from the inhibitory effects of HDACis, while genetic and small molecule inhibition of PA2G4 abrogated EVI1 in 3q26 AML cells, including in patient-derived leukemia xenografts. This study positions PA2G4 at the crosstalk of the EVI1 leukemogenic signal for developing new therapeutics and urges the use of HDACi-based combination therapies in patients with 3q26 AML.

ORGANISM(S): Homo sapiens

PROVIDER: GSE256129 | GEO | 2024/04/01

REPOSITORIES: GEO

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Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML

Project description:The overexpression of the ecotropic viral integration site-1 gene (EVI1/MECOM) marks the most lethal acute myeloid leukemia (AML) subgroup carrying chromosome 3q26 abnormalities. By taking advantage of the intersectionality of high-throughput cell-based and gene expression screens, we identified selective and pan-histone deacetylase inhibitors (HDACis) as potent repressors of EVI1. To understand the mechanism driving on-target anti-leukemia activity of this compound class, we dissected the expression dynamics of the bone marrow leukemia cells of patients treated with HDACi and reconstituted the EVI1 chromatin-associated co-transcriptional complex merging on the role of proliferation-associated 2G4 protein. PA2G4 overexpression rescues AML cells from the inhibitory effects of HDACis, while genetic and small molecule inhibition of PA2G4 abrogated EVI1 in 3q26 AML cells, including in patient-derived leukemia xenografts. This study positions PA2G4 at the crosstalk of the EVI1 leukemogenic signal for developing new therapeutics and urges the use of HDACi-based combination therapies in patients with 3q26 AML.

2024-04-01 | GSE256076 | GEO

Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML

2024-04-01 | GSE256040 | GEO

Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML [scRNA-Seq]

2024-04-01 | GSE256130 | GEO

Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML [RNA-Seq]

2024-04-01 | GSE259221 | GEO

Orthogonal proteogenomic approaches identify the druggable PA2G4-MYC axis in 3q26 AML

Project description:Selective and pan-histone deacetylase inhibitors (HDACis) emerged at the intersection of these approaches. HDACis suppress EVI1 expression and preferentially impair leukemia proliferation in 3q26 AML compared to other leukemia subtypes in multiple preclinical models. To understand this mechanism of action, we dissected the expression dynamics of the bone marrow leukemia cells of patients treated with hit list compounds, reconstituted with the chromatin-associated co-transcriptional complex of EVI1 by rapid immunoprecipitation mass spectrometry (RIME) in human 3q26 AML models; we focused on the role of the proliferation-associated 2G4 (PA2G4) protein. We demonstrated that genetic and HDACi-mediated suppression of EVI1 modulates MYC and that PA2G4 overexpression rescues AML cells from the inhibitory effects of HDACis. Genetic and small molecule inhibition of PA2G4 abrogated EVI1 and, consequently, MYC in 3q26 AML models, including in patient-derived leukemia xenografts. In conclusion, our work positions PA2G4 at the crosstalk of the EVI1 leukemogenic signal for developing new therapeutics and, at this time, urges the use of upfront HDACi-based combination therapies in patients with 3q26 AML.

2024-03-31 | GSE220170 | GEO

Oncogene EVI1 Drives Acute Myeloid Leukemia Via a Targetable Interaction with CTBP2

Project description:Acute myeloid leukemia (AML) driven by the activation of EVI1 due to chromosome 3q26/MECOM rearrangements is incurable with current chemotherapy regimens. Insight into the mechanism by which EVI1 drives myeloid transformation is needed to target EVI1 in those leukemias. Here we demonstrate recurrent interaction of CTBP1/2 with a unique PLDLS motif in EVI1, which is indispensable for leukemic transformation of 3q26/MECOM rearranged AML. A PLDLS competitor construct outcompetes EVI1 to CTBP1/2 binding and inhibits AML proliferation in xenotransplant models. This proof-of-concept study opens the possibility to target one of the most incurable forms of AML using specific inhibitors directed to EVI1/CTBP1/2 interaction. Our findings have important implications for other tumour types with aberrant expression of EVI1 or other oncogenic transcription factors that also depend on CTBP1/2 interaction.

2023-07-13 | PXD043333 | Pride

The expression profiles of AML cell lines

Project description:EVI1 is one of the famous poor prognostic markers for a chemotherapy-resistant acute myeloid leukemia (AML). To identify molecular targets on the surface of leukemia cells with EVI1high expression, we compared the gene expression profiles of several AML cell lines by DNA microarray To search for novel molecular targets in refractory myeloid leukemia with high EVI1 expression, we initially analyzed the gene expression profiles of 12 human myeloid cell lines. Four cell lines with chromosome 3q26 abnormalities (UCSD/AML1, HNT-34, Kasumi-3 and MOLM-1) expressed EVI1High, and eight myeloid cell lines without chromosome 3q26 abnormalities (HEL, HL-60, K052, THP-1, FKH-1, K051, NH and OIH-1) expressed low levels of EVI1 (EVI1Low)

2012-01-18 | E-GEOD-35159 | biostudies-arrayexpress

Oncogene EVI1 Drives Acute Myeloid Leukemia Via a Targetable Interaction with CTBP2 [RNA-seq]

2023-09-30 | GSE243620 | GEO

Oncogene EVI1 Drives Acute Myeloid Leukemia Via a Targetable Interaction with CTBP2 [ChIP-Seq]

2023-07-12 | GSE236010 | GEO

Preclinical efficacy of targeting epigenetic mechanisms in AML with 3q26 lesions and EVI1 overexpression [ChIP-Seq]

Project description:AML with chromosomal alterations involving 3q26 overexpress the transcription factor (TF) EVI1, associated with therapy refractoriness and inferior overall survival in AML. Consistent with a CRISPR screen highlighting BRD4 dependency, treatment with BET inhibitor (BETi) repressed EVI1, LEF1, c-Myc, c-Myb, CDK4/6, and MCL1, and induced apoptosis of AML cells with 3q26 lesions. Tegavivint (TV, BC-2059), known to disrupt binding of nuclear β-catenin and TCF7L2/LEF1 with TBL1, also inhibited co-localization of EVI1 with TBL1 and dose-dependently induced apoptosis in AML cell lines and patient-derived (PD) AML cells with 3q26.2 lesions. TV treatment repressed EVI1, attenuated enhancer activity at ERG, TCF7L2, GATA2 and MECOM loci, abolished interactions between MYC enhancers, repressing AML stemness while upregulating mRNA gene-sets of interferon/inflammatory response, TGF-β signaling and apoptosis-regulation. Co-treatment with TV and BETi or venetoclax induced synergistic in vitro lethality and reduced AML burden, improving survival of NSG mice harboring xenografts of AML with 3q26.2 lesions.

2024-05-06 | GSE247093 | GEO

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