Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

The landscape of RNA polymerase II transcription initiation in C. elegans reveals a novel regulatory architecture

ABSTRACT: It has recently been shown that RNA Polymerase II transcription is far more extensive than previously thought, much of it not associated with protein-coding genes. To investigate this phenomenon, we determined the genome-wide landscape of RNA Polymerase II transcription initiation and elongation in C. elegans. We identify 73,500 distinct clusters of transcription initiation and find that initiation is often bidirectional. Strikingly, the majority of initiation events occur in regions with enhancer-like chromatin signatures. We also assign transcription initiation sites to 7691 protein coding genes, the majority previously unknown because of trans-splicing.

ORGANISM(S): Caenorhabditis elegans

PROVIDER: GSE42819 | GEO | 2013/03/29

SECONDARY ACCESSION(S): PRJNA183503

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

The landscape of RNA polymerase II transcription initiation in C. elegans reveals a novel regulatory architecture

Project description:It has recently been shown that RNA Polymerase II transcription is far more extensive than previously thought, much of it not associated with protein-coding genes. To investigate this phenomenon, we determined the genome-wide landscape of RNA Polymerase II transcription initiation and elongation in C. elegans. We identify 73,500 distinct clusters of transcription initiation and find that initiation is often bidirectional. Strikingly, the majority of initiation events occur in regions with enhancer-like chromatin signatures. We also assign transcription initiation sites to 7691 protein coding genes, the majority previously unknown because of trans-splicing. Through mapping RNA PolII initiation (short capped RNAs) and elongation (long capped RNAs), we provide identification of transcription start sites.

2013-03-29 | E-GEOD-42819 | biostudies-arrayexpress

S.cerevisiae INO80 is required for promoter proximal nucleosome remodeling.

Project description:During transcription, nucleosomes are evicted from regulatory and coding regions yet chromatin structure is stable. Restoration of chromatin structure involves concerted action of chromatin modifying activities. Our analysis demonstrates a genome wide function of the INO80 remodeling complex for stable repositioning of the nucleosome immediately proximal to the transcription initiation site. INO80 dependent remodeling of the promoter proximal nucleosomes has a global repressive role. Recruitment of INO80 to proximal nucleosomes overlaps with the elongating Polymerase II complex assembly. The amount of associated Polymerase II at start sites correlates with INO80 recruitment for inducible and constantly transcribed genes. Furthermore, at highly inducible promoters INO80 is required for repression of bidirectional transcription. Therefore, we suggest a function for INO80 after transcription initiation to achieve Polymerase II dependent reassembly of promoter proximal nucleosomes.

2016-12-24 | E-MTAB-1810 | biostudies-arrayexpress

Identification of sequence-specific promoters driving polycistronic transcription initiation by RNA Polymerase II in trypanosomes

Project description:Protein coding genes in the trypanosome genome are organized in polycistronic transcription units (PTUs). How RNA Polymerase II (Pol II) initiates PTU transcription has not been resolved and the current model favors initiation driven by chromatin epigenetic marks, rather than core-promoters. Here, we identify sequence-specific core promoters by functional characterization of ChIP-Seq Pol II accumulation-peaks. Sequences located between oppositely orientated PTUs contained two independent and distinct core promoters, driving unidirectional transcription. Detailed analysis of one promoter identified 75 bp, necessary and sufficient to fully drive reporter expression, and containing short functional motifs. Analysis of further promoters suggested activity and initiation is regulated and both, focused and dispersed transcription patterns were found. Thus, in contrast to the model of unregulated and promoter-independent transcription initiation, sequence-specific promoters determine the initiation of RNA Pol II transcription of protein coding genes in trypanosomes. These findings resolve the discrepancy between trypanosomes and other eukaryotes in how Pol II initiates protein-coding gene transcription.

2021-02-01 | GSE130798 | GEO

RPAP2 regulates a transcription initiation checkpoint by prohibiting assembly of preinitiation complex [ChIP-Rx]

Project description:RNA polymerase II (Pol II)-mediated transcription in metazoan requires precise regulation. RNA polymerase II-associated protein 2 (RPAP2) was previously identified to transport Pol II from cytoplasm to nucleus and dephosphorylates Pol II C-terminal domain (CTD). We found that RPAP2 binds hypo/hyper-phosphorylated Pol II with undetectable phosphatase activity. Structure of RPAP2-Pol II shows mutually exclusive assembly of RPAP2-Pol II and pre-initiation complex (PIC) due to three steric clashes. RPAP2 prevents/disrupts Pol II-TFIIF interaction and impairs in vitro transcription initiation, suggesting a function in prohibiting PIC assembly. Loss of RPAP2 in cells leads to global accumulation of TFIIF and Pol II at promoters, indicating critical role of RPAP2 in inhibiting PIC assembly independent of its putative phosphatase activity. Our study indicates that RPAP2 functions as a gatekeeper to prohibit PIC assembly and transcription initiation and suggests a novel transcription checkpoint.

2022-05-04 | GSE193678 | GEO

RPAP2 regulates a transcription initiation checkpoint by prohibiting assembly of preinitiation complex [TT-seq]

2022-05-04 | GSE192782 | GEO

RPAP2 regulates a transcription initiation checkpoint by prohibiting assembly of preinitiation complex [ChIP-seq]

2022-05-04 | GSE193679 | GEO

A Chromatin Landmark and Transcription Initiation at Most Promoters in Human Cells

Project description:We describe the results of a genome-wide analysis of human cells that suggests most protein coding genes, including most genes thought to be transcriptionally inactive, experience transcription initiation. We found that nucleosomes with H3K4me3 and H3K9/14Ac modifications, together with RNA polymerase II, occupy the promoters of most protein coding genes in human embryonic stem cells. Only a subset of these genes produce detectable full length transcripts and are occupied by nucleosomes with H3K36me3 modifications, a hallmark of elongation. The other genes experience transcription initiation but show no evidence of elongation, suggesting that they are predominantly regulated at post-initiation steps. Genes encoding most developmental regulators fall into this group. Our results also identify a class of genes that are excluded from experiencing transcriptional initiation, where mechanisms that prevent initiation must predominate. These observations extend to differentiated cells, suggesting that transcription initiation at most genes is a general phenomenon in human cells.

2008-06-27 | E-TABM-277 | biostudies-arrayexpress

Structural basis of SNAPc-dependent snRNA transcription intiation by RNA polymerase II

Project description:RNA Polymerase II (Pol II) carries out transcription of both protein-coding and non-coding genes. Whereas Pol II initiation at protein-coding genes has been studied in detail, Pol II initiation at non-coding genes such as small nuclear RNA (snRNA) genes is not understood at the structural level. Here we study Pol II initiation at snRNA gene promoters and show that the snRNA-activating protein complex (SNAPc) enables DNA opening and transcription initiation independent of TFIIE and TFIIH in vitro. We then resolve cryo-EM structures of the SNAPc-containing Pol II preinitiation complex (PIC) assembled on U1 and U5 snRNA promoters. The core of SNAPc binds two turns of DNA and recognizes the snRNA promoter-specific proximal sequence element (PSE) located upstream of the TATA box-binding protein TBP. Two extensions of SNAPc called wing-1 and wing-2 bind TFIIA and TFIIB, respectively, explaining how SNAPc directs Pol II to snRNA promoters. Comparison of structures of closed and open promoter complexes elucidates TFIIH-independent DNA opening. These results provide the structural basis of Pol II initiation at non-coding RNA gene promoters.

2023-03-11 | PXD033638 | Pride

CDK7 kinase activity promotes RNA polymerase II promoter escape by facilitating initiation factor release

Project description:Cyclin-dependent kinase 7 (CDK7), part of the general transcription factor TFIIH, promotes gene transcription by phosphorylating the C-terminal domain of RNA polymerase II (RNA Pol II). Here, we combine rapid CDK7 kinase inhibition with multi-omics analysis to unravel the direct functions of CDK7 in human cells. CDK7 inhibition causes RNA Pol II retention at promoters, leading to decreased RNA Pol II initiation and immediate global downregulation of transcript synthesis. Elongation, termination, and recruitment of co-transcriptional factors are not directly affected. Although RNA Pol II, initiation factors, and Mediator accumulate at promoters, RNA Pol II complexes can also proceed into gene bodies without promoter-proximal pausing while retaining initiation factors and Mediator. Further downstream, RNA Pol II phosphorylation increases and initiation factors and Mediator are released, allowing recruitment of elongation factors and an increase in RNA Pol II elongation velocity. Collectively, CDK7 kinase activity promotes the release of initiation factors and Mediator from RNA Pol II, facilitating RNA Pol II escape from the promoter.

2024-05-31 | PXD037842 | Pride

Paused RNA polymerase II inhibits new transcriptional initiation

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 | GSE85741 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data