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Histone demethylase LSD1 is required for germinal center formation and BCL6 driven lymphomagenesis

ABSTRACT: Histone demethylase LSD1 is required for germinal center formation and BCL6 driven lymphomagenesis

PROVIDER: PRJNA486791 | ENA |

REPOSITORIES: ENA

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Histone demethylase LSD1 is required for germinal center formation and BCL6-driven lymphomagenesis.

Project description: Not available

| S-EPMC6294324 | biostudies-literature

EZH2 and BCL6 cooperate to assemble CBX8-BCOR Polycomb complex to repress bivalent promoters, mediate germinal center formation and promote lymphomagenesis [RNA-seq]

Project description:EZH2 mediates the humoral immune response and drives lymphomagenesis through de novo formation of bivalent chromatin domains and critical germinal center (GC) B cell promoters. We show that such formation is dependent on the presense of BCL6 and the presence of non-canonical PRC1-BCOR complex. We observe that BCL6 and EZH2 cooperate to accelerate diffuse large B cell lymphoma (DLBCL) development and combinatorial targeting of these repressors results in enhanced anti-lymphoma activity in vitro, in vivo, and in primary human DLBCLs. DLBCL cell lines treated with BCL6 inhibitor 79-6.1085

2016-07-20 | E-GEOD-73109 | biostudies-arrayexpress

EZH2 and BCL6 cooperate to assemble CBX8-BCOR Polycomb complex to repress bivalent promoters, mediate germinal center formation and promote lymphomagenesis [RNA-seq]

2016-07-20 | GSE73109 | GEO

EZH2 and BCL6 cooperate to assemble CBX8-BCOR Polycomb complex to repress bivalent promoters, mediate germinal center formation and promote lymphomagenesis [ChIP-seq]

Project description:The EZH2 histone methyltransferase mediates the humoral immune response and drives lymphomagenesis through de novo formation of bivalent chromatin domains at critical germinal center (GC) B cell promoters. Herein we show that the actions EZH2 in driving GC formation and lymphoma precursor lesions are dependent on the presence of the BCL6 transcriptional repressor, both of which are in turn dependent on the presence of non-canonical PRC1-BCOR complex. BCL6-BCOR complexes assemble preferentially at bivalent promoters in an H3K27me3-dependent manner. We observe specific induction of the CBX8 chromodomain protein in GC B cells. CBX8 binds to H3K27me3 at bivalent promoters and is required for stable association of BCOR complex and its histone modifications. CBX8 loss of function in B cells phenocopies loss of EZH2 and H3K27me3. Moreover, oncogenic BCL6 and EZH2 cooperate to accelerate diffuse large B cell lymphoma (DLBCL) development and combinatorial targeting of these repressors results in enhanced anti-lymphoma activity in vitro, in vivo and in primary human DLBCLs. KDM2B ChIP-sequencing of OCI-Ly1 cells

2016-07-20 | E-GEOD-81623 | biostudies-arrayexpress

EZH2 and BCL6 cooperate to assemble CBX8-BCOR Polycomb complex to repress bivalent promoters, mediate germinal center formation and promote lymphomagenesis [ChIP-seq]

2016-07-20 | GSE81623 | GEO

Histone demethylase LSD1 is required for germinal center formation and BCL6 driven lymphomagenesis

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-12-10 | GSE118783 | GEO

Genome wide binding of BCL6 and LSD1 In GC derived lymphoma B cells

Project description:Using ChIP-seq we identified the genome wide targets of BCL6 and LSD1 in lymhpoma cells (OCI-Ly1) with control siRNA or siRNA targeted to BCL6

2018-12-12 | GSE107920 | GEO

Histone demethylase Lsd1 regulates multiple repressive gene programs during T cell development

Project description:Analysis of the transcriptional profiles of developing thymocytes has shown that T lineage commitment is associated with loss of stem cell and early progenitor gene signatures and the acquisition of T cell gene signatures. Less well understood are the epigenetic alterations that accompany or enable these transcriptional changes. Here, we show that the histone demethylase Lsd1 (Kdm1a) performs a key role in extinguishing stem/progenitor transcriptional programs in addition to key repressive gene programs during thymocyte maturation. Deletion of Lsd1 caused a block in late T cell development and resulted in overexpression of interferon response genes as well as genes regulated by the Gfi1, Bcl6, and, most prominently, Bcl11b transcriptional repressors in CD4+CD8+ thymocytes. Transcriptional overexpression in Lsd1-deficient thymocytes was not always associated with increased H3K4 trimethylation at gene promoters, indicating that Lsd1 indirectly affects the expression of many genes. Together, these results identify a critical function for Lsd1 in the epigenetic regulation of multiple repressive gene signatures during T cell development.

2021-09-25 | GSE156198 | GEO

Transcription profiling of chicken Bcl6 deficient DT40 B cell line to investigate the targets of Bcl6 which is required for germinal center formation

Project description:The transcription factor Bcl6 is required for germinal center formation and deregulated expression of Bcl6 has been observed in lymphomas. To gain insight to the function of Bcl6 in terminal differentiation of B cells to plasma cells and to investigate the targets of Bcl6, we established a Bcl6 deficient DT40 B cell line.

2010-02-17 | E-MEXP-2062 | biostudies-arrayexpress

Uncoupling Histone Modification Crosstalk by Engineering Lysine Demethylase LSD1

Project description:Biochemical crosstalk between two or more histone modifications is often observed in epigenetic enzyme regulation but its functional significance in cells has been difficult to discern. Prior enzymatic studies have revealed that Lys14 acetylation of histone H3 can inhibit Lys4 demethylation by lysine specific demethylase 1 (LSD1). Here we have engineered a mutant form of LSD1, Y391K, which renders the nucleosome demethylase activity of LSD1 insensitive to Lys14 acetylation. Y391K LSD1 knockin cells show increased repression of a set of genes associated with cellular adhesion. Chromatin profiling revealed that the cis-regulatory regions of these silenced genes display a higher level of H3 Lys14 acetylation than the baseline in unedited, parental cells. Y391K LSD1 knockin cells show diminished H3 mono-methyl Lys4 in the vicinity of these silenced genes, consistent with a role for enhanced LSD1 demethylase activity in these regions. These findings illuminate the functional consequences of disconnecting histone modification crosstalk for a key epigenetic enzyme in gene and chromatin regulation.

2024-05-08 | GSE243231 | GEO

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