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SOX7 and ETS factors regulate an endothelial transcriptional program during vascular development

ABSTRACT: Vascular development involves complex changes in gene expression necessary to dictate the behaviour of differentiating endothelial cells within the emerging vascular network. However, the transcriptional programs regulating vascular development are poorly understood. Here we use a microarray approach to profile the genes regulated in response to SOX7 overexpression.

ORGANISM(S): Mus musculus

PROVIDER: GSE63587 | GEO | 2016/10/29

SECONDARY ACCESSION(S): PRJNA268329

REPOSITORIES: GEO

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SOX7 and ETS factors regulate an endothelial transcriptional program during vascular development (DamID)

Project description:Vascular development involves complex changes in gene expression necessary to dictate the behaviour of differentiating endothelial cells within the emerging vascular network. However, the transcriptional programs regulating vascular development are poorly understood. Here we use a DamID approach to profile for the first time the global DNA binding pattern of SOX7, FLI1 and ERG in endothelial precursor cells. We uncover that SOX7, FLI1 and ERG bind together at endothelial specific regulatory regions to drive a transcriptional program important for vascular development.

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SOX7 Target Genes and their Contribution to its Tumor Suppressive Function

Project description:As a transcription factor, SOX7 suppresses cancer development. However, only a few genes were demonstrated as SOX7-activated targets in cancer-irrelevant contexts. We used microarray chips to determine SOX7 target genes in breast cancer cells and discovered multiple signaling pathways altered by ectopic SOX7. We also investigated several genes for their roles in SOX7-mediated tumor suppression. Our study innovatively revealed SOX7 target gene profile in a cancer-relevant context and identified several SOX7-repressed target genes.

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RNA analysis of Sox7- and Sox17-deficient mouse endothelial cells from high grade glioma

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Sox7 regulates lineage decisions in cardiovascular progenitor cells

Project description:Specification of the mesodermal lineages requires a complex set of morphogenetic events orchestrated by interconnected signaling pathways and gene regulatory networks. The transcription factor Sox7 has critical functions in differentiation of multiple mesodermal lineages, including cardiac, endothelial, and hematopoietic. Using a doxycycline-inducible mouse embryonic stem cell (mESC) line, we have previously shown that expression of Sox7 in cardiovascular progenitor cells promotes expansion of endothelial progenitor cells. Here, we show that the ability of Sox7 to promote endothelial cell fate occurs at the expense of the cardiac lineage. Using ChIP-Seq coupled with ATAC-Seq we identify downstream target genes of Sox7 in cardiovascular progenitor cells and, by integrating these data with transcriptomic analyses, we define Sox7-dependent gene programs specific to cardiac and endothelial progenitor cells. Further, we demonstrate a protein-protein interaction between SOX7 and GATA4 and provide evidence that Sox7 interferes with the transcriptional activity of Gata4 on cardiac genes. In addition, we show Sox7 modulates WNT and BMP signaling during cardiovascular differentiation. Our data represent the first genome-wide analysis of Sox7 function and reveal a critical role for Sox7 in regulating signaling pathways that affect cardiovascular progenitor cell differentiation.

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SOX7 ChIP-seq in HUVECs

Project description:We investigated SOX7 binding events on the chromatin under basal conditions in human umbilical vein endothelial cells, upon overexpression of human SOX7-mCherry and immunoprecipitating mCherry. Cells overexpressing only the mCherry tag were used as negative control condition, and peaks called here were substracted from the SOX7-mCherry peaks.

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Gata6 induced XEN-like cells w/o Sox7

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2015-09-14 | E-GEOD-66971 | biostudies-arrayexpress

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Project description:To find out the target of transcription factor Sox7 and Sox17, DNA microarray analysis was performed with RNA from Sox7 and Sox17 knockdown HUVECs.

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Project description:Here we showed that SOX7 was significantly downregulated in different cancer types, especially in lung and breast cancers. Low expression of SOX7 was associated with advanced stage of cancer with shorter overall survival. Cancer cells with loss of SOX7 promoted cell survival and colony formation, suppressed cellular apoptosis and produced a drug resistant phenotype against a variety of chemo/targeting therapeutic agents. Mechanistically, SOX7 induced cellular apoptosis through upregulation of genes associated with both P38 and apoptotic signaling pathway, as well as preventing the proteasome mediated degradation of pro-apoptotic protein BIM. Treatment of either a proteasome inhibitor MG132 or bortezomib, or with a p-ERK/MEK inhibitor U0126 attenuate the SOX7 promoted BIM degradation.

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