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Saccharomyces cerevisiae

ABSTRACT: Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast (ChIP-Seq)

PROVIDER: PRJNA215353 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR953022.fastq.gz	Fastqsanger.gz
	SRR953023.fastq.gz	Fastqsanger.gz
	SRR953024.fastq.gz	Fastqsanger.gz

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Saccharomyces cerevisiae

Project description:Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast (ChIP-Chip)

| PRJNA215351 | ENA

Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast (ChIP-Seq)

Project description:whole genome analysis of RNA pol II and histone H3 in WT and Spt6-depleted cells using a tetracycline regulated ts degron mutant, spt6-td. ChIP-seq of histone H3and pol II in budding yeast (W303 background)

2013-08-16 | E-GEOD-49926 | biostudies-arrayexpress

Spt6 directly interacts with Cdc73 and is required for Paf1C occupancy at active genes in Saccharomyces cerevisiae

Project description:The Paf1 complex (Paf1C) is a conserved transcription elongation factor that regulates transcription elongation efficiency, facilitates co-transcriptional histone modifications, and impacts molecular processes linked to RNA synthesis, such as polyA site selection. Coupling of the activities of Paf1C to transcription elongation requires its association with RNA polymerase II (Pol II). Mutational studies in yeast identified Paf1C subunits Cdc73 and Rtf1 as important mediators of Paf1C association with Pol II on active genes. While the interaction between Rtf1 and the general elongation factor Spt5 is relatively well-understood, the interactions involving Cdc73 have not been fully elucidated. Using a site-specific protein cross-linking strategy in yeast cells, we identified direct interactions between Cdc73 and two components of the Pol II elongation complex, the elongation factor Spt6 and the largest subunit of Pol II. Both of these interactions require the tandem SH2 domain of Spt6. We also show that Cdc73 and Spt6 can interact in vitro and that rapid depletion of Spt6 dissociates Paf1 from chromatin, altering patterns of Paf1C-dependent histone modifications genome-wide. These results reveal interactions between Cdc73 and the Pol II elongation complex and identify Spt6 as a key factor contributing to the occupancy of Paf1C at active genes in Saccharomyces cerevisiae.

2023-02-24 | GSE201436 | GEO

Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast

Project description:Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast

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Nucleosome depletion in Saccharomyces cerevisiae terminator

Project description:H3 ChIP and input DNA were hybridized to Affymetrix GeneChip S. cerevisiae Tiling 1.0R Array Genome-wide mapping of nucleosomes generated by micrococcal nuclease (MNase) suggests that yeast promoter and terminator regions are very depleted of nucleosomes, predominantly because their DNA sequences intrinsically disfavor nucleosome formation. However, MNase has strong DNA sequence specificity that favors cleavage at promoters and terminators and accounts for some of the correlation between occupancy patterns of nucleosomes assembled in vivo and in vitro. Using an improved method for measuring nucleosome occupancy in vivo that does not involve MNase, we confirm that promoter regions are strongly depleted of nucleosomes, but find that terminator regions are much less depleted than expected. Unlike at promoter regions, nucleosome occupancy at terminators is strongly correlated with the orientation of and distance to adjacent genes. In addition, nucleosome occupancy at terminators is strongly affected by growth conditions, indicating that it is not primarily determined by intrinsic histone-DNA interactions. Rapid removal of RNA polymerase II (Pol II) causes increased nucleosome occupancy at terminators, strongly suggesting a transcription-based mechanism of nucleosome depletion. However, the distinct behavior of terminator regions and their corresponding coding regions suggests that nucleosome depletion at terminators is not simply associated with passage of Pol II, but rather involves a distinct mechanism linked to 3’ end formation.

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Saccharomyces cerevisiae

Project description:HDACs and Phosphorylated Pol II CTD recruit Spt6 for cotranscriptional histone reassembly

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Chromatin regulates alternative polyadenylation via the RNA polymerase II elongation rate

Project description:The Pol II elongation rate influences poly(A) site selection, with slow and fast Pol II derivatives causing upstream and downstream shifts, respectively, in poly(A) site utilization. In yeast, depletion of either of the histone chaperones FACT or Spt6 causes an upstream shift of poly(A) site use that strongly resembles the poly(A) profiles of slow Pol II mutant strains. Like slow Pol II mutant strains, Spt6- and FACT-depleted cells exhibit processivity defects, indicating that both Spt6 and FACT stimulate the Pol II elongation rate. Poly(A) profiles of some genes show atypical downstream shifts; this subset of genes overlaps well for FACT- or Spt6- depleted strains, but it is different from the atypical genes in Pol II speed mutant strains. In contrast, depletion of histone H3 or H4 causes a downstream shift of poly(A) sites for most genes, indicating that nucleosomes inhibit the Pol II elongation rate in vivo. Thus, chromatin-based control of the Pol II elongation rate is a potential mechanism, distinct from direct effects on the cleavage/polyadenylation machinery, to regulate alternative polyadenylation in response to genetic or environmental changes.

2024-07-08 | GSE262747 | GEO

Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast (ChIP-Chip)

Project description:whole genome analysis of RNA pol II and histone H3 in WT and Spt6-depleted cells using a tetracycline regulated ts degron mutant, spt6-td.

2013-08-16 | GSE49927 | GEO

Genome-wide effects of Spt6 on RNA pol II and Histone H3 occupancy in budding yeast (ChIP-Seq)

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