ABSTRACT: We knocked down AGO2 protein by RNAi in HeLaS3 human cell line. The current experiment aims at comparing nucleosome positioning in control and AGO2 knock down cells. HeLaS3 cell were cultured in DMEM. Cells were transfected with AGO2 siRNAs (or control siRNA) at day 1. On day 4 MNAse digestion of chromatin was performed. Mnase-digested chromatin DNA fragments were sequenced by paired-end DNA-seq.
Project description:Characterization of AGO2 bound short RNAs from nuclear extracts of HeLaS3 cell line. Nuclei were isolated from HeLaS3 cells; a fraction of Nuclear lysates was harvsted and sequenced as the 'input' samples. The rest of nuclear lysates were Immunoprecipitated using AGO2 monoclonal antibodies or Isotype matched IgG. Following immunoprecipitation, RNA was extracted from AGO2 or control IgG IP for short RNA sequencing. Two independent biological replicates were carried out.
Project description:We aimed to identify the effect of AGO2 depletion by genome editing on the mRNA expression profile of human cells. The experimental model used is the human cell line HeLaS3. All copies of AGO2 gene were disrupted by targeted genome editing using ZNF nucleases.
Project description:In order to assess the effect of AGO2 on the transcriptional and post-transcriptional regulation of gene expression, RNA expression was profiled in untreated, CTRL siRNA transfected and AGO2 siRNA transfected HeLaS3 cells
Project description:Characterization of AGO1 bound short RNAs from nuclear extracts of HeLaS3 cell line. Nuclei were isolated from HeLaS3 cells; a fraction of Nuclear lysates was harvsted and sequenced as the input samples. The rest of nuclear lysates were immunoprecipitated using AGO1 monoclonal antibodies or Isotype matched IgG. Following immunoprecipitation, RNA was extracted from AGO1 or control IgG IP for short RNA sequencing. Two independent biological replicates were carried out.
Project description:NF-Y, a trimeric transcription factor (TF) composed of two histone-like subunits (NF-YB (NFYB) and NF-YC (NFYC)) and a sequence-specific subunit (NF-YA), binds to the CCAAT motif, a common promoter element. Genome-wide mapping reveals 5,000-15,000 NF-Y binding sites depending on the cell type, with the NF-YA and NF-YB subunits binding asymmetrically with respect to the CCAAT motif. Despite being characterized as a proximal promoter TF, only 25% of NF-Y sites map to promoters. A comparable number of NF-Y sites are located at enhancers, many of which are tissue specific, and nearly half of NF-Y sites are in select subclasses of HERV LTR repeats. Unlike most TFs, NF-Y can access its target DNA motif in inactive (non-modified) or polycomb-repressed chromatin domains. Unexpectedly, NF-Y extensively co-localizes with FOS in all genomic contexts, and at promoters and enhancers this often occurs in the absence of JUN and the AP-1 motif. NF-Y also co-associates with a select cluster of growth-controlling and oncogenic TFs, consistent with the abundance of CCAAT motifs in the promoters of genes overexpressed in cancer. Interestingly, NF-Y and several growth-controlling TFs bind in a stereo-specific manner, suggesting a mechanism for cooperative action at promoters and enhancers. Our results indicate that NF-Y is not merely a commonly-used, proximal promoter TF, but rather performs a more diverse set of biological functions, many of which are likely to involve co-association with FOS. Scrambled control (shSCM) and NF-YA pLKO.1-shRNAs were designed by Sigma-Aldrich. The puromycin resistance cassette was replaced with an EGFP cassette. Viral production and transduction were carried out as previously described (Benatti et al. 2011). HeLaS3 cells were transduced with shSCM or shNF-YA viral supernatants, in triplicate, and cells collected after 48 hr of incubation. Total RNA was prepared by Trizol extraction and Qiagen RNeasy kit purification, converted to biotinylated aRNA and hybridized to U133 Plus 2.0 GeneChip expression arrays using the 3’ IVT Express Kit (Affymetrix, USA) following the manufacturer’s protocol. Arrays were RMA normalized (Irizarry et al. 2003), gene expression levels calculated, differential expression determined using the following R packages from the Bioconductor project: affy (Gautier et al. 2004), limma (Smyth 2004). HelaS3 cells were transduced with shSCM or shNF-YA in triplicate for 48hrs.
Project description:Drosophila PBAP complex, a form of SWI/SNF class of complexes, played a important role in metamorphosis. We conducted MNase digestion followed by next-generation sequencing (NGS) to analyse the nucleosome profile in both control and Brm knockdown fly larvae.
Project description:modENCODE_submission_5263 This submission comes from a modENCODE project of Gary Karpen. For full list of modENCODE projects, see http://www.genome.gov/26524648 Project Goal: We aim to determine the locations of 125 chromosomal proteins across the Drosophila melanogaster genome. The proteins under study are involved in basic chromosomal functions such as DNA replication, gene expression, gene silencing, and inheritance. We will perform Chromatin ImmunoPrecipitation (ChIP) using genomic tiling arrays. We will initially assay localizations using chromatin from three cell lines and two embryonic stages, and will then extend the analysis of a subset of proteins to four additional animal tissues/stages 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: Strain: Ago2 414(official name : Ago2[414] genotype : w;;ago2[414] outcross : 0 description : Ago2 null mutant description : described in Developmental Stage: 3rd Instar Larvae; Genotype: w;;ago2[414]; NUMBER OF REPLICATES: 4; EXPERIMENTAL FACTORS: Strain Ago2 414(official name : Ago2[414] genotype : w;;ago2[414] outcross : 0 description : Ago2 null mutant description : described in Antibody HP1 wa191 (target is HP1a); Developmental Stage 3rd Instar Larvae