Spt4 promotes Pol I processivity and transcription elongation
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA702517 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13733831.fastq.gz | Fastqsanger.gz | |||
| SRR13733832.fastq.gz | Fastqsanger.gz | |||
| SRR13733833.fastq.gz | Fastqsanger.gz | |||
| SRR13733834.fastq.gz | Fastqsanger.gz | |||
| SRR13733835.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 6 |
Similar Datasets
Project description:The goal of this study was to determine the effect of Spt4 on transcription by Pol I in vivo. Therefore, Native Elongating Transcript Sequencing (NET-seq) was used to evaluate the occupancy of Pol I in wild-type and spt4△ strains. We determined that in spt4△ yeast, there was a processivity defect and Pol I accumulated at the 5' end of the 35S gene. Additionally, we observed that there was an enrichment for G-rich sequences just downstream of a high A content in the spt4△ strain, indicating that perhaps Spt4 plays a role in helping to propel Pol I through these regions of the rDNA. Altogether, this study suggests that Spt4 is an important transcription factor for Pol I by promoting polymerase processivity.
2021-02-18 | GSE166983 | GEO
Project description:RNA polymerases (Pols) I, II, and III collectively synthesize most of the RNA in a eukaryotic cell. Transcription by Pols I, II, and III is regulated by hundreds of trans-acting factors. One such protein, Spt4, has been previously identified as a transcription factor that influences both Pols I and II. Spt4 forms a complex with Spt5, described as the Spt4/5 complex (or DSIF in mammalian cells). This complex has been shown previously to directly interact with Pol I and potentially affect transcription elongation. The previous literature identified defects in transcription by Pol I when SPT4 was deleted, but the necessary tools to characterize the mechanism of this effect were not available at the time. Here, we use a technique called Native Elongating Transcript Sequencing (NET-seq) to probe for the global occupancy of Pol I in wild-type (WT) and spt4△ Saccharomyces cerevisiae (yeast) cells at single nucleotide resolution in vivo. Analysis of NET-seq data reveals that Spt4 promotes Pol I processivity and enhances transcription elongation through regions of the ribosomal DNA that are particularly G-rich. These data suggest that Spt4/5 may directly affect transcription elongation by Pol I in vivo.
| S-EPMC8000598 | biostudies-literature
Project description:Spt5 is a highly conserved RNA polymerase II (Pol II)-associated pausing and elongation factor. However, its impact on global elongation and Pol II processivity in mammalian cells has not been clarified. Here, we show that depleting Spt5 in mouse embryonic fibroblasts (MEFs) does not cause global elongation defects or decreased elongation rates. Instead, in the absence of Spt5, a fraction of Pol II molecules are dislodged during elongation thus decreasing the number of Pol II complexes that complete the transcription cycle. Most strikingly, this decrease is restricted to a narrow window between 15-20 kb from the promoter, a distance which coincides with the stage where accelerating Pol II attains maximum elongation speed and processivity. Consequently, long genes show a greater dependency on Spt5 for optimal elongation efficiency and overall gene expression than short genes. We propose that an important role of Spt5 in mammalian elongation is to promote the processivity of those Pol II complexes that are transitioning towards maximum elongation speed 15-20 kb from the promoter.
2018-03-06 | GSE106313 | GEO
Project description:The Nucleosome Destabilizing Factor (NDF) facilitates transcription through chromatin, but its precise mechanism remains incompletely understood. Here, we identify a critical region (amino acids 140-160) within NDF that specifically interacts with phosphorylated RPB1, the largest subu-nit of elongating RNA Polymerase II (Pol II). Mutations in this region disrupt Pol II interaction and impair Pol II elongation both in vitro and in cells, yet do not affect NDF's ability to destabilize nu-cleosomes, establishing a functional separation between these two activities. Cellular studies re-veal that NDF knockout cells display faster Pol II elongation rates but produce fewer nascent tran-scripts, demonstrating NDF's primary role in maintaining transcriptional processivity through-out gene bodies. Our findings demonstrate that NDF uses distinct mechanisms to ensure productive transcription elongation rather than simply enhancing elongation speed, offering new insights in-to how transcription efficiency is maintained in chromatin.
2025-05-28 | GSE294087 | GEO
Project description:The Nucleosome Destabilizing Factor (NDF) facilitates transcription through chromatin, but its precise mechanism remains incompletely understood. Here, we identify a critical region (amino acids 140-160) within NDF that specifically interacts with phosphorylated RPB1, the largest subu-nit of elongating RNA Polymerase II (Pol II). Mutations in this region disrupt Pol II interaction and impair Pol II elongation both in vitro and in cells, yet do not affect NDF's ability to destabilize nu-cleosomes, establishing a functional separation between these two activities. Cellular studies re-veal that NDF knockout cells display faster Pol II elongation rates but produce fewer nascent tran-scripts, demonstrating NDF's primary role in maintaining transcriptional processivity through-out gene bodies. Our findings demonstrate that NDF uses distinct mechanisms to ensure productive transcription elongation rather than simply enhancing elongation speed, offering new insights in-to how transcription efficiency is maintained in chromatin.
2025-05-28 | GSE294088 | GEO
Project description:The protein IWS1 (Interacts with SPT6 1) has been implicated in various transcription-associated processes, but whether it has a direct role in RNA polymerase (Pol) II transcription remains unclear. Here, we establish a rapid depletion system for IWS1 in human cells, and use it to elucidate its function in vivo by multi-omics kinetic analysis. We show that IWS1 depletion results in a global decrease of RNA synthesis in vivo that is due to a decrease in Pol II elongation velocity and in vitro biochemical assays reveal that IWS1 directly stimulates Pol II transcription by lowering the nucleosome entry barrier. Further analyses show that H3K36me3 decreases upon IWS1 depletion although the recruitment of the histone methyltransferase SETD2 to chromatin is unaffected. We conclude that IWS1 has a direct role in Pol II transcription and is essential for maintaining normal RNA elongation, which in turn is required for normal chromatin methylation.
2025-07-30 | PXD056248 | Pride
Project description:The protein IWS1 (Interacts with SPT6 1) has been implicated in various transcription-associated processes, but whether it has a direct role in RNA polymerase (Pol) II transcription remains unclear. Here, we establish a rapid depletion system for IWS1 in human cells, and use it to elucidate its function in vivo by multi-omics kinetic analysis. We show that IWS1 depletion results in a global decrease of RNA synthesis in vivo that is due to a decrease in Pol II elongation velocity and in vitro biochemical assays reveal that IWS1 directly stimulates Pol II transcription by lowering the nucleosome entry barrier. Further analyses show that H3K36me3 decreases upon IWS1 depletion although the recruitment of the histone methyltransferase SETD2 to chromatin is unaffected. We conclude that IWS1 has a direct role in Pol II transcription and is essential for maintaining normal RNA elongation, which in turn is required for normal chromatin methylation.
2025-07-30 | PXD066658 | Pride
Project description:mRNA cap addition occurs early during RNA pol II transcription, facilitating pre-mRNA processing and translation. We report that the mammalian mRNA cap methyltransferase, RNMT-RAM, promotes RNA pol II transcription, independently of mRNA capping and translation. In cells, sub-lethal suppression of RNMT-RAM reduces RNA pol II occupancy, net mRNA synthesis and pre-mRNA levels. Conversely, expression of RNMT-RAM increases transcription independently of cap methyltransferase activity. In isolated nuclei, recombinant RNMT-RAM stimulates transcriptional output; this requires the RAM RNA-binding domain. RNMT-RAM interacts with nascent transcripts along their entire length and with transcription associated factors including RNA pol II subunits, SPT4, SPT6 and PAFc. Suppression of RNMT-RAM inhibits transcriptional markers including histone H2B K120 ubiquitination, H3 K4 and K36 methylation, RNA pol II S5 and S2 phosphorylation and PAFc recruitment. These findings suggest that multiple interactions between RNMT-RAM, RNA pol II factors and RNA along the transcription unit stimulate transcription.
2018-05-01 | GSE87767 | GEO
Project description:NDF/GLYR1 Promotes RNA Polymerase II Processivity via Pol II Binding and Nucleosome Destabilization
| PRJNA1248047 | ENA
Project description:NDF/GLYR1 Promotes RNA Polymerase II Processivity via Pol II Binding and Nucleosome Destabilization
| PRJNA1248046 | ENA