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CUT&RUN comparing the occupancy of MAX, MNT, MGA, MYC and RNA pol II Ser5 in a MAX null vs MAX reconstituted mouse SCLC line (mRPMaxKO)

ABSTRACT: The goal of this study was to compare the genomic occupancy of MAX, MNT, MGA and RNA pol II Ser5 in MAX restored versus MAX null SCLC (mRPMaxKO)

ORGANISM(S): Mus musculus

PROVIDER: GSE146388 | GEO | 2020/06/06

REPOSITORIES: GEO

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CUT&RUN comparing the occupancy of MAX, MNT, MGA, MYC and RNA pol II Ser5 in a MAX null vs MAX reconstituted mouse SCLC line (mRPMaxKO)

Project description:CUT&RUN comparing the occupancy of MAX, MNT, MGA, MYC and RNA pol II Ser5 in a MAX null vs MAX reconstituted mouse SCLC line (mRPMaxKO)

| PRJNA610291 | ENA

CUT&RUN comparing occupancy of MAX, MNT, MYC in MAX WT and KO B220+ cells

Project description:The goal of this study was to genomic occupancy of MAX, MNT, MYC and E2F1 in B cells in the presence and absence of transcription factor MAX Although MAX is regarded as an obligate dimerization partner for MYC, its function in normal development and neoplasia is poorly defined. We show that B-cell specific deletion of Max has a modest effect on B-cell development but completely abrogates E -Myc driven lymphomagenesis. While Max loss only affects a few hundred genes in normal B cells, it leads to the global downregulation of Myc-activated genes in premalignant E -Myc cells. We show that the balance between MYC-MAX and MNT-MAX interactions in B cells shifts in pre-malignant B cells towards a MYC driven transcriptional program. Moreover, we find that MAX loss leads to a significant reduction in MYC protein levels and downregulation of direct transcriptional targets, including regulators of MYC stability. This phenomenon is also observed in multiple cell lines treated with MYC-MAX dimerization inhibitors. Our work uncovers a layer of Myc autoregulation critical for lymphomagenesis yet partly dispensable for normal development.

2019-06-20 | GSE132967 | GEO

MAX-mutant small cell lung cancers exhibit impaired activities of MGA-dependent ncPRC1.6.

Project description:The MYC axis is commonly disrupted in cancer, mostly by activation of the MYC family of oncogenes, but also by genetic inactivation of MAX, the obligate partner of MYC, and of the MAX partner, MGA, both of which are members of the polycomb repressive complex, ncPRC1.6. While the oncogenic properties of the MYC family have been extensively studied, the tumor suppressor functions of MAX and MGA and the role of the MYC genes in MAX-mutant cells remain unclear. To address these knowledge gaps, we used chromatin immunoprecipitation, RNA-sequencing and mass spectrometry-based proteomic analysis in MAX-restituted and MYC oncogenic-transformed cell lines derived from human small cell lung cancer (SCLC), which is a high-grade neuroendocrine type of lung cancer. We found that MAX-mutant SCLC cells express ASCL1 and ASCL1-dependent targets, implying that these cells belong to the ASCL1-dependent group of SCLCs. In the absence of MAX, even after ectopic overexpression of MYC, we found no recruitment of MYC to the DNA. Furthermore, MAX reconstitution triggered pro-differentiation expression profiles that shifted when MAX and oncogenic MYC were co-expressed. Although ncPRC1.6 could be formed, the lack of MAX restricted global MGA occupancy, selectively driving its recruitment towards E2F6 motifs. Conversely, MAX restitution enhanced MGA occupancy and global gene repression of genes involved in different functions, including stem-cell and DNA repair/replication. Our data reveal that MAX-mutant SCLCs have ASCL1 characteristics, and are MYC-independent, and that their oncogenic features include deficient ncPRC1.6-mediated gene repression.

2021-09-22 | PXD017658 | Pride

MAX-mutant small cell lung cancers sustain impaired activities of the MGA-dependent ncPRC1

Project description:The MYC-axis is disrupted in cancer, mostly by activation of the MYC-oncogenes but also through inactivation of the MYC-partner, MAX, or of the MAX-partner, MGA, both also members of the polycomb repressive complex, ncPRC1.6. Here, we use genetically modified MAX-deficient small cell lung cancer (SCLC) cells and apply genome wide and proteomics analysis to study the tumor suppressor function of MAX. We find that MAX-mutant SCLCs classify as ASCL1-type and lack MYC-transcriptional activities. MAX-restitution triggers pro-differentiation expression profiles that shift when MAX and oncogenic MYC (HMYC/MAX) are co-expressed. Despite the ncPRC1.6 can be formed, the lack of MAX restricts global MGA-occupancy, selectively driving its recruitment towards E2F6-motifs. Conversely, MAX-restitution enhances MGA-occupancy and global gene repression of genes involved in different functionalities, including stem-cell and DNA repair/replication. Collectively, these findings reveal that MAX-mutant SCLCs have ASCL1-characteristics, are MYC-independent and their oncogenic features include a deficient ncPRC1.6-mediated gene repression.

2021-01-18 | GSE144457 | GEO

CUT&RUN studies comparing occupancy of MAX, MGA, MYC and L3MBTL2 occupancy in Empty vector and sgMGA transduced A549 lung adenocarcinoma cells

Project description:The goal of this study was to examine the genomic occupancy of MAX, MGA, MYC and L3MBTL2 in MGA depleted vs. control cells

2020-11-16 | GSE161539 | GEO

MYC-MNT-MAX

Project description:The MYC antagonist MNT autoregulates its expression and supports proliferation in MAX deficient cells

| PRJEB23604 | ENA

SARS-CoV-2 Nsp6 damages Drosophila heart and mouse cardiomyocytes through MGA/MAX complex-mediated increased glycolysis

Project description:SARS-CoV-2 infection causes COVID-19, a severe acute respiratory disease associated with cardiovascular complications including long-term outcomes. The presence of virus in cardiac tissue of patients with COVID-19 suggests this is a direct, rather than secondary, effect of infection.Here, by expressing individual SARS-CoV-2 proteins in the Drosophila heart, we demonstrate interaction of virus Nsp6 with host proteins of the MGA/MAX complex (MGA, PCGF6 and TFDP1).

2022-10-04 | PXD036447 | Pride

Genomic occupancy of MAX and members of the MYC network in MAX WT and MAX null preSCs (polyclonal population)

Project description:Conventional crosslinked ChIP was performed on sgCtrl (control guide RNA) and sgMax (guide RNA against Max) transduced preSCs (early stage SCLC line). We find that loss of MAX leads to decreased MAX, MYC and MNT occupancy.

2020-06-06 | GSE146385 | GEO

Identification of MAX signature on MAX deficient SCLC cell lines

Project description:To development our gene expression approach, we have employed whole genome microarray expression profiling as a discovery platform to identify genes potentialy regulated by the transcription factor MAX.Human SCLC cell lines waere analyzed for mutations at the MAX locus. Those cell lines that were found mutated in MAX and showed no MAX protein expression were used as a models to restore the expression of MAX transcription factor, and Identify MAX signature on Human SCLC.

2013-12-28 | GSE48559 | GEO

Mnt Represses Epithelial Identity To Promote Epithelial to Mesenchymal Transition

Project description:The multi-step process of epithelial to mesenchymal transition (EMT), whereby static epithelial cells become migratory mesenchymal cells, is heavily involved in development, wound healing, and disease states. Despite the major involvement of basic helix-loop-helix (bHLH) transcription factors (TFs) in cell-fate determination, few have examined them for their involvement in fundamental processes that require EMT. Here, we have identified Max network transcription repressor (MNT) as a potent EMT promoting TF in mammary epithelium. We show that depletion of MNT blocked TGF?-induced phenotypic changes, and transcriptomic analysis revealed that MNT is a transcription repressor of epithelial identity. We show that MNT mediates repression of epithelial identity via direct interaction with HDAC1. Lastly, we show that MNT and its target genes are heavily expressed in EMT-High breast cancer, with MNT required for breast cancer cell migration. Taken together, these findings establish MNT as a critical regulator of cell-fate determination and the EMT transcriptome.

2021-09-29 | GSE158546 | GEO

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