Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Paused RNA polymerase II inhibits new transcriptional initiation

ABSTRACT: RNA polymerase II (Pol II) pauses downstream of the transcription initiation site before beginning productive elongation. This pause is a key component of metazoan gene expression regulation. Some promoters have a strong disposition for Pol II pausing and often mediate faster, more synchronous changes in expression. This requires multiple rounds of transcription and thus cannot rely solely on pause release. But it is unclear how pausing affects the initiation of new transcripts during consecutive rounds of transcription. Using our recently developed ChIP-nexus method, we find that Pol II pausing inhibits new initiation. We propose that paused Pol II helps prevent new initiation between transcription bursts, which may reduce noise.

ORGANISM(S): Drosophila melanogaster

PROVIDER: GSE85741 | GEO | 2017/04/17

SECONDARY ACCESSION(S): PRJNA339229

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Similar Datasets

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-nexus]

Project description:RNA polymerase II (Pol II) pauses downstream of the transcription initiation site before beginning productive elongation. This pause is a key component of metazoan gene expression regulation. Some promoters have a strong disposition for Pol II pausing and often mediate faster, more synchronous changes in expression. This requires multiple rounds of transcription and thus cannot rely solely on pause release. But it is unclear how pausing affects the initiation of new transcripts during consecutive rounds of transcription. Using our recently developed ChIP-nexus method, we find that Pol II pausing inhibits new initiation. We propose that paused Pol II helps prevent new initiation between transcription bursts, which may reduce noise.

2017-04-17 | GSE85738 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-Seq]

2017-04-17 | GSE85740 | GEO

Paused RNA polymerase II inhibits new transcriptional initiation [ChIP-nexus spike-in]

2017-04-17 | GSE85739 | GEO

Conserved DNA sequence features underlie pervasive RNA polymerase pausing

Project description:This study reveals widespread Pol II pausing at single-nucleotide resolution across the human genome with the majority of Pol II pauses occur outside of promoter-proximal gene regions primarily along the gene-body of transcribed genes. We show DNA sequence properties underlying widespread transcriptional pausing including a new pause motif. The study indicates pervasive sequence-induced transcriptional pausing in human cells.

2021-03-23 | GSE162857 | GEO

The pause-initiation limit restricts transcription activation in human cells

Project description:Eukaryotic gene transcription is often controlled at the level of RNA polymerase II (Pol II) pausing in the promoter-proximal region. Pausing Pol II limits the frequency of transcription initiation (‘pause-initiation limit’), predicting that the pause duration must be decreased for transcriptional activation. To test this prediction, we conducted a genome-wide kinetic analysis of the heat shock response in human cells. We show that the pause-initiation limit restricts transcriptional activation at most genes. Gene activation generally requires the activity of the P-TEFb kinase CDK9, which decreases the duration of Pol II pausing and thereby enables an increase in the productive initiation frequency. The transcription of enhancer elements is generally not pause-limited and can be activated without CDK9 activity. Our results define the kinetics of Pol II transcriptional regulation in human cells at all gene classes during a natural transcription response.

2019-07-10 | GSE123980 | GEO

TFIID enables RNA polymerase II promoter-proximal pausing

Project description:RNA polymerase II (pol II) transcribes all protein-coding and many non-coding RNAs in the human genome. Pol II transcription initiation is governed by the Pre-Initiation Complex (PIC), which contains TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIH, pol II, and Mediator. After initiation, pol II enzymes typically pause after transcribing less than 100 bases, and paused polymerases represent a common regulatory intermediate. Accordingly, paused pol II has been implicated in enhancer function, development and homeostasis, and diseases ranging from cancer to viral pathogenesis. Precisely how pol II promoter-proximal pausing is enforced and regulated remains unclear; however, protein complexes such as NELF and DSIF increase pausing whereas the activity of CDK9 (P-TEFb complex) correlates with pause release. To address specific mechanistic questions about pol II pausing and its regulation, we reconstituted human pol II promoter-proximal pausing in vitro, entirely with purified factors (no extracts). As expected, NELF and DSIF increased pol II pausing in vitro, whereas P-TEFb promoted pause release. Unexpectedly, the PIC alone was sufficient to reconstitute pol II pausing, suggesting that pausing is an inherent property of the PIC. In agreement, pol II pausing was lost upon replacement of the TFIID complex with TATA-binding protein (TBP); moreover, pausing was dependent upon TFIID subunits TAF1 and TAF2. TAF1/2 bind genomic DNA downstream of the pol II initiation site, invoking a “complex interaction” model for pausing. Consistent with this model, PRO-Seq experiments revealed increased transcription upon acute depletion (t=60 min) of TAF1 and TAF2 in human cells, and pol II pausing was disrupted at thousands of genes. Similar results were obtained in TAF1-depleted Drosophila S2 cells. Collectively, these data establish the general transcription factor TFIID as a genome-wide regulator of pol II promoter-proximal pausing.

2020-05-28 | GSE132764 | GEO

Enhancers predominantly control transcription initiation [scaRNA-seq]

Project description:Gene transcription occurs via a cycle of linked events including initiation, promoter proximal pausing and elongation of RNA polymerase II (Pol 2). A key question is how do transcriptional enhancers influence these events to control gene expression? Here we have used a new approach to quantify transcriptional initiation and pausing in-vivo, while simultaneously identifying transcription start sites (TSSs) and pause-sites (TPSs). When analysed in parallel with nascent RNA-seq, these data show that differential gene expression is achieved predominantly via changes in transcription initiation rather than Pol 2 pausing or elongation. Using genetically engineered mouse models deleted for specific enhancers we show that these elements control gene expression via Pol 2 recruitment and/or initiation rather than via promoter proximal pause release. Using genome-wide analysis we show that enhancers, in general, control gene expression at the stage of Pol 2 recruitment and initiation rather than via pausing.

2021-02-03 | GSE138358 | GEO

Enhancers predominantly control transcription initiation [ATAC-seq]

2021-02-03 | GSE138357 | GEO

Enhancers predominantly control transcription initiation [mNET-seq]

2021-02-03 | GSE138356 | GEO

Enhancers predominantly control transcription initiation [RNA-seq]

2021-02-03 | GSE138355 | GEO