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Chromatin accessibility of GIST48, GIST882 and GIST-T1 cells with ETV1 or FOXF1 knockdown

ABSTRACT: ATAC profiles were generated by deep sequencing using Illumina HiSeq.

ORGANISM(S): Homo sapiens

PROVIDER: GSE106623 | GEO | 2018/02/01

REPOSITORIES: GEO

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ETV1 and FOXF1 cistrome in wildtype GIST48, GIST-T1, MDA-PCa2b, and ETV1 or FOXF1 knocked-down GIST48 cells

Project description:ChIP profiles were generated by deep sequencing using Illumina HiSeq.

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Chromatin accessibility of GIST48, GIST882 and GIST-T1 cells with ETV1 or FOXF1 knockdown

Project description:Chromatin accessibility of GIST48, GIST882 and GIST-T1 cells with ETV1 or FOXF1 knockdown

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ETV1 knockdown in GIST cell lines

2010-10-13 | GSE19396 | GEO

ETV1 and FOXF1 cistrome in wildtype GIST48, GIST-T1, MDA-PCa2b, and ETV1 or FOXF1 knocked-down GIST48 cells

Project description:ETV1 and FOXF1 cistrome in wildtype GIST48, GIST-T1, MDA-PCa2b, and ETV1 or FOXF1 knocked-down GIST48 cells

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ETV1 knockdown in GIST cell lines

Project description:ETV1 is highly expressed in GIST cells and required for their survival and growth. To identify genes and pathways regulated by ETV1 in GIST, we performed expression profiles of GIST cells after ETV1 knockdown. Two GIST cell lines (GIST48 and GIST882) were infected in duplicate with three shRNA viruses (Scrambled, ETV1sh1-B11TRCN0000013923, ETV1sh2-TRCN0000013925). Four days after infection, RNA was harvested for expression profiling.

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Mapping of ETV1 genomic binding sites in gastrointestinal stromal tumor (GIST).

Project description:ETV1 is highly expressed in GIST and their presumed precursors--the interstitial cells of Cajal. ETV1 is required for survival for both GIST and ICC and regulates GIST signature genes. Here, using Illumina-Solexa based next-generation sequencing of ETV1 chromatin immunoprecipates (ChIP-Seq), we define ETV1 binding sites in the GIST48 cell line. Crosslinked ChIP using input control ETV1 ChIP in GIST48 cells. Details: GIST48 cells were crosslinked for 15-minutes in 1% parformaldehyde. Cells were lysed and chromatin sheared using bioruptor. Sheared chromatin was incubated with anti-rabbit IgG dynabeads pre-conjugated with anti-ETV1 antibody (Abcam Ab81086, Lot 787879), washed, eluted, reverse cross-linked, and purified. Purified ChIP DNA was blunt-ended, ligated to Solexa adaptors, amplified with 18-cycles of PCR, and sequenced on Solexa Genome Analyzer. All reads (~36-bp) from ChIP-Seq were aligned to the human genome (build 36, or hg18) using the ELAND alignment software within the Illumina Analysis Pipeline. Unique reads mapped to a single best-matching location with no more than two mismatches were kept and used to generate genome-wide distribution of ETV1-binding and for peak identification. Redundant reads were considered once.

2010-10-14 | E-GEOD-22441 | biostudies-arrayexpress

ETV1 binding sites in GIST and Melanoma cells

Project description:ETV1 is an oncogene in GIST and melanoma and a downstream transcriptional effector of MAP kinase signaling. Here, mapped the ETV1 binding sites in GIST and melanoma cell lines using ChIP-seq.

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Combined inhibition of MAP kinase and KIT signaling synergistically destabilizes ETV1 and suppresses GIST tumor growth.

Project description:UNLABELLED:Gastrointestinal stromal tumor (GIST), originating from the interstitial cells of Cajal (ICC), is characterized by frequent activating mutations of the KIT receptor tyrosine kinase. Despite the clinical success of imatinib, which targets KIT, most patients with advanced GIST develop resistance and eventually die of the disease. The ETS family transcription factor ETV1 is a master regulator of the ICC lineage. Using mouse models of Kit activation and Etv1 ablation, we demonstrate that ETV1 is required for GIST initiation and proliferation in vivo, validating it as a therapeutic target. We further uncover a positive feedback circuit where MAP kinase activation downstream of KIT stabilizes the ETV1 protein, and ETV1 positively regulates KIT expression. Combined targeting of ETV1 stability by imatinib and MEK162 resulted in increased growth suppression in vitro and complete tumor regression in vivo. The combination strategy to target ETV1 may provide an effective therapeutic strategy in GIST clinical management. SIGNIFICANCE:ETV1 is a lineage-specific oncogenic transcription factor required for the growth and survival of GIST. We describe a novel strategy of targeting ETV1 protein stability by the combination of MEK and KIT inhibitors that synergistically suppress tumor growth. This strategy has the potential to change first-line therapy in GIST clinical management.

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RNA-Seq of murine GIST-like tumors after Etv1 ablation

Project description:We used a mouse expressing three alleles 1) KitV558Delta/+ activating allele that develop GIST-like tumors in the cecum, 2) Etv1 flox/flox conditional knockout allele and 3) Rosa26-CreERT2 tamoxifen activated Cre allele. Mice were treated with either Tamoxifen (to delete Etv1) or corn oil (control). Cecal tumors were isolated for gene expression profiling by RNA-Seq.

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