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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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GRO-seq of Drosophila embryos at 2-2.5 hours and 3-3.5 hours after egg laying (AEL)

ABSTRACT: The transition in developmental control from maternal to zygotic gene products marks a critical step in early embryogenesis. Here, we use GRO-seq analysis to map the genome-wide RNA polymerase distribution during the Drosophila maternal to zygotic transition. This analysis unambiguously identifies the zygotic transcriptome, and provides insight into its mechanisms of regulation. Two replicates of GRO-seq at each time point.

ORGANISM(S): Drosophila melanogaster

SUBMITTER: Abbie Saunders

PROVIDER: E-GEOD-41611 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Extensive polymerase pausing during Drosophila axis patterning enables high-level and pliable transcription.

Saunders Abbie A Core Leighton J LJ Sutcliffe Catherine C Lis John T JT Ashe Hilary L HL

Genes & development 20130501 10

Cascades of zygotic gene expression pattern the anterior-posterior (AP) and dorsal-ventral (DV) axes of the early Drosophila embryo. Here, we used the global run-on sequencing assay (GRO-seq) to map the genome-wide RNA polymerase distribution during early Drosophila embryogenesis, thus providing insights into how genes are regulated. We identify widespread promoter-proximal pausing yet show that the presence of paused polymerase does not necessarily equate to direct regulation through pause rele ...[more]

PMID: 23699410

Similar Datasets

GRO-seq of Drosophila embryos at 2-2.5 hours and 3-3.5 hours after egg laying (AEL)

Project description:The transition in developmental control from maternal to zygotic gene products marks a critical step in early embryogenesis. Here, we use GRO-seq analysis to map the genome-wide RNA polymerase distribution during the Drosophila maternal to zygotic transition. This analysis unambiguously identifies the zygotic transcriptome, and provides insight into its mechanisms of regulation.

2013-05-28 | GSE41611 | GEO

X chromosome dosage compensation via enhanced transcriptional elongation in Drosophila males (Untreated)

Project description:MSL (Male-specific lethal) complex increases transcription on the single X chromosome of Drosophila males in order to equalize expression of X-linked genes between males (XY) and females (XX). The increase in transcript levels correlates with MSL- dependent acetylation of histone H4 at K16 within the bodies of active genes, but identification of the transcriptional step affected has not been possible. In this study, we use global run-on sequencing (GRO-seq) to examine the specific effect of MSL complex on RNA Polymerase II (RNAP II) on a genome-wide level. Results indicate that MSL complex enhances transcription by facilitating the progression of RNAP II across the bodies of active X-linked genes. Improving transcriptional output downstream of typical gene-specific control may explain how dosage compensation can be imposed on the diverse set of genes along an entire chromosome. Global Run-On Sequencing (GRO-Seq) reads, i.e., RNA-Seq of nascent RNA transcripts, from D. Melanogaster SL2 cells. Two biological replicates were analyzed.

2010-12-22 | E-GEOD-25321 | biostudies-arrayexpress

X chromosome dosage compensation via enhanced transcriptional elongation in Drosophila males (Control & MSL2 RNAi)

2011-03-03 | E-GEOD-25887 | biostudies-arrayexpress

Fcp1 dephosphorylation of the RNA polymerase II C-terminal domain required for efficient transcription of heat shock genes

Project description:RNA polymerase II is decreased on heat shock-induced genes when the CTD phosphatase Fcp1 is knocked down in Drosophila S2 cells. We examined transcriptionally-engaged Pol II genome-wide with GRO-seq to determine if other genes are similarly affected. Two biological replicates of nascent RNA sequencing

2012-06-28 | E-GEOD-38748 | biostudies-arrayexpress

Histone deacetylases positively regulate transcription through the elongation machinery

Project description:Global run-on sequencing (GRO-seq) analysis of breast cancer cells upon perturbations of transcription elongation regulators.

2015-10-20 | E-MTAB-3626 | biostudies-arrayexpress

Global effects of the CSR-1 RNA interference pathway on transcriptional landscape

Project description:Argonaute proteins and their small RNA co-factors short interfering RNAs (siRNAs) are known to inhibit gene expression at the transcriptional and post-transcriptional levels. In Caenorhabditis elegans, the Argonaute CSR-1 binds thousands of endogenous siRNAs (endo-siRNAs) antisense to germline transcripts and associates with chromatin in a siRNA-dependent manner. However, its role in gene expression regulation remains controversial. Here, we used a genome-wide profiling of nascent RNA transcripts to demonstrate that the CSR-1 RNAi pathway promotes sense-oriented Pol II transcription. Moreover, a loss of CSR-1 function resulted in global increase in antisense transcription and ectopic transcription of silent chromatin domains, which led to reduced chromatin incorporation of centromere-specific histone H3. Based on these findings, we propose that the CSR-1 pathway has a role in maintaining the directionality of active transcription thereby propagating the distinction between transcriptionally active and silent genomic regions. GRO-seq (Global Run-On sequencing) for detection of nascent transcripts. Two biological replicates were generated for csr-1 hypomorphic mutant and the corresponding WT samples using ~300,000 worms for each experiment, and two biological replicates were prepared for drh-3 (ne4253) mutant and the corresponding WT samples using ~100,000 worms for each experiment. The GRO-seq were performed in late L3/early L4 stage worms. (8 samples total)

2014-02-28 | E-GEOD-49946 | biostudies-arrayexpress

Cell type-specific chromatin profiling of Drosophila neurons [ChIP-Seq]

Project description:Chromatin profiling of nuclei isolated from genetically defined neuronal subpopulations of the adult Drosophila brain. Cell type-specific histone modification maps were generated from nuclei isolated from all neurons (R57C10-GAL4), Kenyon cells (OK107-GAL4), and octopaminergic (Tdc2-GAL4) neurons using a method similar to INTACT (Deal and Henikoff, 2010; Steinner et al., 2012). Three histone modifications were profiled: H3K4me3, H3K27ac, and H3K27me3. Sequencing was performed with an Illumina HiSeq 2000.

2012-08-02 | E-GEOD-37032 | biostudies-arrayexpress

Cell type-specific gene expression and chromatin profiling of Drosophila neurons

Project description:This SuperSeries is composed of the following subset Series: GSE37027: Cell type-specific gene expression profiling of Drosophila neurons [RNA-Seq] GSE37032: Cell type-specific chromatin profiling of Drosophila neurons [ChIP-Seq] Refer to individual Series

2012-08-01 | E-GEOD-37033 | biostudies-arrayexpress

Piwi induces piRNA-guided transcriptional silencing and establishment of a repressive chromatin state

Project description:In the Metazoan germline, piwi proteins and associated piwi-interacting RNAs (piRNAs) provide a defense system against the expression of transposable elements. In the cytoplasm, piRNA sequences guide piwi complexes to destroy complementary transposon transcripts by endonucleolytic cleavage. However, some piwi family members are nuclear, raising the possibility of alternative pathways for piRNA-mediated regulation of gene expression. We found that Drosophila Piwi is recruited to chromatin, co-localizing with RNA polymerase II on polytene chromosomes. Knockdown of Piwi in the germline increases expression of transposable elements that are targeted by piRNAs, whereas protein-coding genes remain largely unaffected. De-repression of transposons upon Piwi depletion correlates with increased occupancy of RNA polymerase II on their promoters. Expression of piRNAs that target a reporter construct results in a decrease in Pol II occupancy and an increase in repressive H3K9me3 marks and HP1 on the reporter locus. Our results indicate that Piwi identifies targets complementary to the associated piRNA and induces transcriptional repression by establishing a repressive chromatin state when correct targets are found. Examination of mRNA levels, Pol II occupancy, and chromatin repressive state in D. melanogaster ovaries upon Piwi knockdown and Piwi mutation. This records present the sequencing data related to Piwi knockdown study portion.

2013-02-11 | E-GEOD-43829 | biostudies-arrayexpress

Global Run-On sequencing (GRO-seq) of HeLa cells under CDK9 inhibitor tratment to study elongation checkpoints at both ends of RNA polymerase II-transcribed genes.

Project description:Global Run-On sequencing (GRO-seq) was carried out on nuclei isolated from HeLa cells after 30 minutes of treatment with CDK9 inhibitors KM05382 and DRB and from two untreated controls. Libraries of nascent RNAs were generated and sequenced using Illumina Hi-seq technology. GRO-seq reads were processed, deduplicated, mapped to human genome and normalised to reads in the 5’ ETS of the 45S rRNA gene.

2015-02-26 | E-MTAB-3360 | biostudies-arrayexpress

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