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Bap1 loss results in EZH2 dependent transformation

ABSTRACT: BAP1 and ASXL1 interact to form a polycomb deubiquitinase complex that removes monoubiquitin from histone H2A lysine 119 (H2AK119Ub). However, BAP1 and ASXL1 are mutated in distinct cancer types, consistent with independent roles in regulating epigenetic state and malignant transformation. Here we demonstrate that Bap1 loss results in increased trimethylated histone H3 lysine 27 (H3K27me3), elevated Ezh2 expression, and enhanced repression of Polycomb Repressive Complex 2 (PRC2) targets. These findings contrast with the reduction in H3K27me3 seen with Asxl1 loss. Conditional deletion of Bap1 and Ezh2 in vivo abrogates the myeloid progenitor expansion induced by Bap1 loss alone.

ORGANISM(S): Mus musculus

PROVIDER: GSE61360 | GEO | 2015/10/05

SECONDARY ACCESSION(S): PRJNA260851

REPOSITORIES: GEO

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Cancer-associated ASXL1 mutations may act as gain-of-function mutations of the ASXL1-BAP1 complex

Project description:ASXL1 is the obligate regulatory subunit of a deubiquitinase complex whose catalytic subunit is BAP1. Heterozygous mutations of ASXL1 that result in premature truncations are frequent in myeloid leukemias and Bohring-Opitz syndrome. Here, we demonstrate that truncated ASXL1 proteins confer enhanced activity on the ASXL1-BAP1 complex. Stable expression of truncated, hyperactive ASXL1-BAP1 complexes in a hematopoietic precursor cell line resulted in global erasure of H2AK119Ub, striking depletion of H3K27me3, selective upregulation of a subset of genes whose promoters bore both H2AK119Ub and H3K4me3, and spontaneous differentiation to the mast cell lineage. These outcomes required the catalytic activity of BAP1, indicating these events were downstream consequences of H2AK119Ub erasure. In bone marrow precursors, truncated ASXL1-BAP1 expression cooperated with TET2 loss-of-function to increase differentiation to the myeloid lineage in vivo. We propose that pathological ASXL1 mutations confer gain-of-function on the ASXL-BAP1 complex. ChIP-Seq for H2AK119Ub, H3K4me3, H3K27me3 on EML cells. RNA-Seq on EML cells expressing ASXL1(1-479)+BAP1 and control.

2015-03-11 | E-GEOD-65555 | biostudies-arrayexpress

Cancer-associated ASXL1 mutations may act as gain-of-function mutations of the ASXL1-BAP1 complex

2015-03-11 | GSE65555 | GEO

Genome wide binding sites of BAP1, HCF1 and OGT

Project description:We report the genome wide binding sites of BAP1, HCF1 and OGT in bone marrow derived macrophages. De-ubiquitinating enzyme BAP1 is mutated in a hereditary cancer syndrome with increased risk of mesothelioma and uveal melanoma. Somatic BAP1 mutations occur in various malignancies. We show that mouse Bap1 gene deletion is lethal during embryogenesis, but systemic or hematopoietic-restricted deletion in adults recapitulates features of human myelodysplastic syndrome (MDS). Knockin mice expressing BAP1 with a 3xFlag tag revealed that BAP1 interacts with host cell factor–1 (HCF-1), O-linked N-acetylglucosamine transferase (OGT), and the polycomb group proteins ASXL1 and ASXL2 in vivo. OGT and HCF-1 levels were decreased by Bap1 deletion, indicating a critical role for BAP1 in stabilizing these epigenetic regulators. Human ASXL1 is mutated frequently in chronic myelomonocytic leukemia (CMML) so an ASXL/BAP1 complex may suppress CMML. A BAP1 catalytic mutation found in a MDS patient implies that BAP1 loss of function has similar consequences in mice and humans. For BAP1, bone marrow derived macrophages were used differentiated from bone marrow cells of BAP1-3X Flag Tagged KI mice we generated. For OGT and HCF1, bone marrow derived macrophages were used from BAP1 WT mice.

2012-11-07 | E-GEOD-40723 | biostudies-arrayexpress

BAP1 complex promotes transcription by opposing PRC1-mediated H2A ubiquitylation

Project description:In Drosophila, a complex consisting of Calypso and ASX catalyzes H2A deubiquitination and has been reported to act as part of the Polycomb machinery in transcriptional silencing. The mammalian homologs of these proteins (BAP1 and ASXL1/2/3, respectively), are frequently mutated in various cancer types, yet their precise functions remain unclear. Using an integrative approach based on isogenic cell lines generated with CRISPR/Cas9, we uncover an unanticipated role for BAP1 in gene activation. This function requires the assembly of an enzymatically active BAP1-associated core complex (BAP1.com) containing one of the redundant ASXL proteins. We investigate the mechanism underlying BAP1.com-mediated transcriptional regulation and show that it does not participate in Polycomb-mediated silencing. Instead, our results establish that the function of BAP1.com is to safeguard transcriptionally active genes against silencing by the Polycomb Repressive Complex 1.

2019-01-28 | PXD011808 | Pride

Genome-wide maps of chromatin modifications in wild-type or mutant HAP1 cells

Project description:Using ChIP-seq, we profiled several histone marks associated with active transcription (H3K4me3) or with Polycomb-mediated silencing (H2AK119ub1 and H3K27me3) in wild-type HAP1 cells and in cells mutated in BAP1, ASXL1, ASXL2, EZH2 and RING1B.

2018-11-21 | GSE110133 | GEO

Genome wide binding sites of BAP1, HCF1 and OGT

2012-11-07 | GSE40723 | GEO

Differential expression in wild type and mutant HAP1 cells [RNA-seq I]

Project description:using RNA-seq we characterized gene expression changes occuring upon knockout of BAP1, ASXL1, ASXL2, ASXL1/2 or Polycomb genes RING1B and EZH2. We also investigated the response to retinoic acid treatment in wild-type and BAP1 KO cells.

2018-11-21 | GSE110142 | GEO

Epigenetic targeted therapy of leukemia through a hyper-activated BAP1-ASXL1-mutant axis

Project description:The ASXL1 gene is the human homolog of the Drosophila Asx gene, a core subunit in the BAP1 histone H2A deubiquitinase complex. Mutations of ASXL1 occur in multiple myeloid neoplasms and are uniformly associated with poor prognosis. However, the molecular mechanism through which ASXL1 mutations alter BAP1 activity to drive leukemogenesis remains unclear. Here we demonstrate that cancer-associated frame-shift ASXL1 mutations, which were originally proposed to act as destabilizing loss-of-function mutations, in fact encode truncated stable gain-of-function proteins. Truncated ASXL1 protein stabilizes BAP1, enhances BAP1 complex recruitment to chromatin and promotes the expression of numerous leukemia associated genes. Chemical inhibition of BAP1 rescues these changes in gene expression in leukemic cells and inhibits tumor progression. This study represents a breakthrough advance in our understanding of the molecular mechanisms of ASXL1 mutations in leukemic pathogenesis and identifies small molecular inhibitors of BAP1 function as a potential targeted therapy for leukemia.

2021-03-07 | GSE166305 | GEO

The effects of mutant ASXL1 and BAP1 expression on hematopoietic cells

Project description:To identify target genes of mutant ASXL1 and BAP1 in hematopoietic cells, we performed RNA-seq using murine c-kit positive cells transduced with ASXL1-MT (MT) or ASXL1-MT-K351R (KR) together with vector or BAP1. Method：Murine c-kit positive bone marrow cells were transduced with ASXL1-MT (MT) or ASXL1-MT-K351R (KR) (coexpressing blastcidin resistant gene) together with vector or BAP1 (coexpressing puromycin resistant gene). After the selection with blasticidin and puromycin for three days, colony-forming cells were collected to extract RNA for RNA-seq analysis.

2018-05-25 | GSE114861 | GEO

Regulation of B lymphocyte development by histone H2A deubiquitinase BAP1 (Bap1KO_RNA-Seq)

Project description:BAP1 is a deubiquitinase (DUB) of the Ubiquitin C-terminal Hydrolase (UCH) family that regulates gene expression and other cellular processes, via deubiquitination of histone H2AK119ub and other substrates. BAP1 is an important tumour suppressor in human, expressed and functional across many cell-types and tissues, including those of the immune system. B lymphocytes are the mediators of humoral immune response, however the role of BAP1 in B cell development and physiology remains poorly understood. Here we characterize a mouse line with a selective deletion of BAP1 within the B cell lineage (Bap1fl/fl mb1-Cre) and establish a cell intrinsic role of BAP1 in the regulation of B cell development. We demonstrate a depletion of large pre-B cells, transitional B cells, and mature B cells in Bap1fl/fl mb1-Cre mice. We characterize broad transcriptional changes in BAP1-deficient pre-B cells, map BAP1 binding across the genome, and analyze the effects of BAP1-loss on histone H2AK119ub levels and distribution. Overall, our work establishes a cell intrinsic role of BAP1 in B lymphocyte development, and suggests its contribution to the regulation of the transcriptional programs of cell cycle progression, via the deubiquitination of histone H2AK119ub.

2021-03-29 | GSE162084 | GEO

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