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Gene expression analysis of Drosophila melanogaster S2 cells after RNAi-mediated depletion of the insulator factor CTCF

ABSTRACT: We analyzed transcriptional effects after depletion of Drosophila melanogaster S2 cells from CTCF via specific dsRNA treatment in comparison to cells treated with control dsRNA.

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE12719 | GEO | 2009/02/21

SECONDARY ACCESSION(S): PRJNA114127

REPOSITORIES: GEO

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Gene expression analysis of Drosophila melanogaster S2 cells after RNAi-mediated depletion of the insulator factor CP190

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Project description:Chromatin insulators and Polycomb group (PcG) complexes control nuclear organization to effect changes in gene expression. In Drosophila, RNA silencing pathways influence long range interactions mediated by PcG proteins and nuclear localization of the gypsy insulator; however, the underlying mechanisms are unknown. Here, we identify a singular requirement for Argonaute2 (AGO2) for the activity of the CCCTC-binding factor (CTCF)/Centrosomal protein 190 (CP190) dependent Fab-8 insulator. AGO2 and CP190 interact physically, and genome wide localization of AGO2 by chromatin immunoprecipitation and sequencing (ChIP-seq) reveals extensive colocalization of AGO2 with insulators and Polycomb Response Elements (PREs) but minimal overlap with regions of endogenous small interfering RNA (endo-siRNA) production. Finally, depletion of either CTCF or CP190 results in loss of AGO2 association with insulators, PREs, and other cis-regulatory regions. Our findings suggest that Dicer-independent recruitment of AGO2 to chromatin by insulator proteins promotes the definition of transcriptional domains throughout the genome. ChIP-seq of AGO2 in two Drosophila cell types (S2 and S3)

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HP4 Q4072.S2.HP4 RNAi

Project description:modENCODE_submission_5600 This submission comes from a modENCODE project of Gary Karpen. For full list of modENCODE projects, see http://www.genome.gov/26524648 Project Goal: The goal of these experiments are to a) validate/confirm the locations of 125 chromosomal proteins across the Drosophila melanogaster genome and b) evaluate their biological significance by assaying the impact of depletion on other proteins/marks. We are using RNAi to deplete individual non-histone chromosomal proteins in Drosophila BG3 and S2 tissue culture cells, followed by Chromatin ImmunoPrecipitation (ChIP) assayed on genomic tiling arrays. Comparison of a protein factor's binding profiles before and after depletion will increase the confidence of our predictions. For data usage terms and conditions, please refer to http://www.genome.gov/27528022 and http://www.genome.gov/Pages/Research/ENCODE/ENCODEDataReleasePolicyFinal2008.pdf EXPERIMENT TYPE: CHIP-chip. BIOLOGICAL SOURCE: Cell Line: S2-DRSC; Tissue: embryo-derived cell-line; Developmental Stage: late embryonic stage; Sex: Male; NUMBER OF REPLICATES: 4; EXPERIMENTAL FACTORS: Cell Line S2-DRSC; Antibody HP4 Q4072 (target is HP4); dsRNA (RNAi_reagent) CG8044_RNAi&oldid=70468

2013-04-04 | E-GEOD-45767 | biostudies-arrayexpress

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CTCF-VC.BG3.CP190_RNAi

Project description:modENCODE_submission_3671 This submission comes from a modENCODE project of Gary Karpen. For full list of modENCODE projects, see http://www.genome.gov/26524648 Project Goal: The goal of these experiments are to validate and confirm the locations of 125 chromosomal proteins across the Drosophila melanogaster genome. To do this, we are using RNAi to deplete individual non-histone chromosomal proteins in Drosophila BG3 and S2 tissue culture cells, and then using antibodies to perform Chromatin ImmunoPrecipitation (ChIP) using genomic tiling arrays. Comparison of a protein factor's binding profiles before and after depletion will increase the confidence of our predictions. For data usage terms and conditions, please refer to http://www.genome.gov/27528022 and http://www.genome.gov/Pages/Research/ENCODE/ENCODEDataReleasePolicyFinal2008.pdf EXPERIMENT TYPE: CHIP-chip. BIOLOGICAL SOURCE: Cell Line: ML-DmBG3-c2; Tissue: CNS-derived cell-line; Developmental Stage: third instar larval stage; Genotype: y v f mal; Sex: Unknown; NUMBER OF REPLICATES: 4; EXPERIMENTAL FACTORS: Cell Line ML-DmBG3-c2; Antibody CTCF-VC (target is CTCF); dsRNA (RNAi_reagent) CG6384_RNAi&oldid=39664

2011-10-12 | E-GEOD-32781 | biostudies-arrayexpress

CTCF-VC.BG3.LacZ_RNAi

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