EWSR1::ATF1 Orchestrates the Clear Cell Sarcoma Transcriptome in Human Tumors and A Mouse Genetic Model [ChIP-Seq 1]
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE248749 | GEO | 2023/12/01
REPOSITORIES: GEO
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Project description:A particular fusion protein that drives the rare, but deadly pediatric cancer, clear cell sarcoma. The fusion protein was expressed in mice, leading to the formation of similar tumors as those it causes in humans. This permitted the study of fusion protein function in these tumors.
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Project description:a particular fusion protein that drives the rare, but deadly pediatric cancer, clear cell sarcoma. The fusion protein was expressed in mice, leading to the formation of similar tumors as those it causes in humans. This permitted the study of fusion protein function in these tumors.
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Project description:Clear cell sarcoma (CCS) is a rare, aggressive malignancy that most frequently arises in the soft tissues of the extremities. It is defined and driven by expression of one member of a family of related translocation-generated fusion oncogenes, the most common of which is EWSR1::ATF1. The EWSR1::ATF1 fusion oncoprotein reprograms transcription. However, the binding distribution of EWSR1::ATF1 across the genome and its target genes remain unclear. Here, we interrogated the genomic distribution of V5-tagged EWSR1::ATF1 in tumors it had induced upon expression in mice that also recapitulated the transcriptome of human CCS. ChIP-sequencing of V5-EWSR1::ATF1 identified previously unreported motifs including the AP1 motif and motif comprised of TGA repeats that resemble GGAA-repeating microsatellites bound by EWSR1::FLI1 in Ewing sarcoma. ChIP-sequencing of H3K27ac identified super enhancers in the mouse model and human contexts of CCS, which showed a shared super enhancer structure that associates with activated genes.
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Project description:Chimeric proteins resulting from chromosomal translocations play a major role as driver oncogenes in cancer. Among them, fusions between EWSR1 and a set of transcription factors (TFs) generate oncogenes with powerful chromatin regulatory activities, capable of establishing complex gene expression programs. However, specific EWSR1 fusion proteins have been implicated in distinct tumor types, suggesting an enhancement of their functional properties by permissive precursor cells. Here we combined functional epigenomics with nuclear topology mapping to define the epigenetic and 3D connectivity landscape of Clear Cell Sarcoma (CCS), one of the most aggressive forms of human cancer, driven by the EWSR1-ATF1 fusion gene. We find that EWSR1-ATF1 display a distinctive binding pattern that depends on the EWSR1 prion-like domain, and is divergent from wild type ATF1, despite the physical interaction between wt and EWSR1-ATF1 proteins. This cooperativity promotes ATF1 retargeting to new distal sites, leading to chromatin activation and the establishment of a 3D network that controls oncogenic and differentiation signatures shared with primary CCS tumors. Conversely, EWSR1-ATF1 depletion results in a marked reconfiguration of 3D connectivity, including the emergence of a new set of connections controlling neural crest-related developmental programs. Accordingly, interrogation of more than 160,000 single cell expression profiles from the human skin atlas reveals loss of EWSR1-ATF1 expression to induce a more differentiated tumor cell state. Taken together, our study uncovers the cooperativity network of EWSR1-ATF1, delineates the molecular underpinnings of its epigenetic function in CCS, and points to precursor cells along the Schwann cell-melanocytic axis as a candidate origin for these tumors.
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Project description:Chimeric proteins resulting from chromosomal translocations play a major role as driver oncogenes in cancer. Among them, fusions between EWSR1 and a set of transcription factors (TFs) generate oncogenes with powerful chromatin regulatory activities, capable of establishing complex gene expression programs. However, specific EWSR1 fusion proteins have been implicated in distinct tumor types, suggesting an enhancement of their functional properties by permissive precursor cells. Here we combined functional epigenomics with nuclear topology mapping to define the epigenetic and 3D connectivity landscape of Clear Cell Sarcoma (CCS), one of the most aggressive forms of human cancer, driven by the EWSR1-ATF1 fusion gene. We find that EWSR1-ATF1 display a distinctive binding pattern that depends on the EWSR1 prion-like domain, and is divergent from wild type ATF1, despite the physical interaction between wt and EWSR1-ATF1 proteins. This cooperativity promotes ATF1 retargeting to new distal sites, leading to chromatin activation and the establishment of a 3D network that controls oncogenic and differentiation signatures shared with primary CCS tumors. Conversely, EWSR1-ATF1 depletion results in a marked reconfiguration of 3D connectivity, including the emergence of a new set of connections controlling neural crest-related developmental programs. Accordingly, interrogation of more than 160,000 single cell expression profiles from the human skin atlas reveals loss of EWSR1-ATF1 expression to induce a more differentiated tumor cell state. Taken together, our study uncovers the cooperativity network of EWSR1-ATF1, delineates the molecular underpinnings of its epigenetic function in CCS, and points to precursor cells along the Schwann cell-melanocytic axis as a candidate origin for these tumors.
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Project description:Chimeric proteins resulting from chromosomal translocations play a major role as driver oncogenes in cancer. Among them, fusions between EWSR1 and a set of transcription factors (TFs) generate oncogenes with powerful chromatin regulatory activities, capable of establishing complex gene expression programs. However, specific EWSR1 fusion proteins have been implicated in distinct tumor types, suggesting an enhancement of their functional properties by permissive precursor cells. Here we combined functional epigenomics with nuclear topology mapping to define the epigenetic and 3D connectivity landscape of Clear Cell Sarcoma (CCS), one of the most aggressive forms of human cancer, driven by the EWSR1-ATF1 fusion gene. We find that EWSR1-ATF1 display a distinctive binding pattern that depends on the EWSR1 prion-like domain, and is divergent from wild type ATF1, despite the physical interaction between wt and EWSR1-ATF1 proteins. This cooperativity promotes ATF1 retargeting to new distal sites, leading to chromatin activation and the establishment of a 3D network that controls oncogenic and differentiation signatures shared with primary CCS tumors. Conversely, EWSR1-ATF1 depletion results in a marked reconfiguration of 3D connectivity, including the emergence of a new set of connections controlling neural crest-related developmental programs. Accordingly, interrogation of more than 160’000 single cell expression profiles from the human skin atlas reveals loss of EWSR1-ATF1 expression to induce a more differentiated tumor cell state. Taken together, our study uncovers the cooperativity network of EWSR1-ATF1, delineates the molecular underpinnings of its epigenetic function in CCS, and points to precursor cells along the Schwann cell-melanocytic axis as a candidate origin for these tumors.
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Project description:Chimeric proteins resulting from chromosomal translocations play a major role as driver oncogenes in cancer. Among them, fusions between EWSR1 and a set of transcription factors (TFs) generate oncogenes with powerful chromatin regulatory activities, capable of establishing complex gene expression programs. However, specific EWSR1 fusion proteins have been implicated in distinct tumor types, suggesting an enhancement of their functional properties by permissive precursor cells. Here we combined functional epigenomics with nuclear topology mapping to define the epigenetic and 3D connectivity landscape of Clear Cell Sarcoma (CCS), one of the most aggressive forms of human cancer, driven by the EWSR1-ATF1 fusion gene. We find that EWSR1-ATF1 display a distinctive binding pattern that depends on the EWSR1 prion-like domain, and is divergent from wild type ATF1, despite the physical interaction between wt and EWSR1-ATF1 proteins. This cooperativity promotes ATF1 retargeting to new distal sites, leading to chromatin activation and the establishment of a 3D network that controls oncogenic and differentiation signatures shared with primary CCS tumors. Conversely, EWSR1-ATF1 depletion results in a marked reconfiguration of 3D connectivity, including the emergence of a new set of connections controlling neural crest-related developmental programs. Accordingly, interrogation of more than 160,000 single cell expression profiles from the human skin atlas reveals loss of EWSR1-ATF1 expression to induce a more differentiated tumor cell state. Taken together, our study uncovers the cooperativity network of EWSR1-ATF1, delineates the molecular underpinnings of its epigenetic function in CCS, and points to precursor cells along the Schwann cell-melanocytic axis as a candidate origin for these tumors.
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Project description:This SuperSeries is composed of the SubSeries listed below.
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