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Schizosaccharomyces pombe

ABSTRACT: Spt6 regulates intragenic and antisense transcription, nucleosome positioning, and histone modifications genome-wide in fission yeast [Mnase-seq]

PROVIDER: PRJNA214322 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR948276_1.fastq.gz	Fastqsanger.gz
	SRR948276_2.fastq.gz	Fastqsanger.gz
	SRR948277_1.fastq.gz	Fastqsanger.gz
	SRR948277_2.fastq.gz	Fastqsanger.gz
	SRR948278_1.fastq.gz	Fastqsanger.gz

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Project description:Spt6 regulates intragenic and antisense transcription, nucleosome positioning, and histone modifications genome-wide in fission yeast [ChIP-seq]

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Project description:Spt6 regulates intragenic and antisense transcription, nucleosome positioning, and histone modifications genome-wide in fission yeast

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Spt6 is required for the fidelity of promoter selectivity

Project description:Spt6 is a conserved factor that controls transcription and chromatin structure across the genome. Although viewed as an elongation factor, spt6 mutations allow transcription from within coding regions, suggesting that Spt6 also controls initiation. To comprehensively characterize the requirement for Spt6 in transcription, we have used four approaches: TSS-seq and TFIIB ChIP-nexus to assay transcription initiation, NET-seq to assay elongating RNAPII, and MNase-seq to assay nucleosome occupancy and positioning. Our results demonstrate that Spt6 represses transcription initiation at thousands of intragenic promoters. We characterize these intragenic promoters, and find some features conserved with genic promoters and other features that are distinct. Finally, we show that Spt6 regulates transcription initiation at most genic promoters and propose a model of initiation site competition to account for this. Together, our results demonstrate that Spt6 controls the fidelity of transcription initiation throughout the genome and reveal the magnitude of the potential for expressing alternative genetic information via intragenic promoters.

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Spt6 is required for heterochromatic silencing in the fission yeast Schizosaccharomyces pombe

Project description:Spt6 is a conserved factor, critically required for several transcription and chromatin related processes. We now show that Spt6 and its binding partner, Iws1, are required for heterochromatic silencing in Schizosaccharomyces pombe. Our studies demonstrate that Spt6 is required for silencing of all heterochromatic loci and that an spt6 mutant has an unusual combination of heterochromatic phenotypes compared to previously studied silencing mutants. Unexpectedly, we find normal nucleosome positioning over heterochromatin and normal levels of histone H3K9 dimethylation. However, we also find greatly reduced levels of H3K9 trimethylation, elevated levels of H3K14 acetylation, and reduced recruitment of several silencing factors. Our evidence suggests that Spt6 plays a role at both the transcriptional and post-transcriptional levels; in an spt6 mutant, RNA polymerase II (RNAPII) occupancy at the pericentric regions is only modestly increased, while production of small interfering RNAs (siRNAs) is lost. Taken together, our results suggest that Spt6 is required for multiple steps in heterochromatic silencing by controlling chromatin, transcriptional, and post-transcriptional processes.

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Project description:Hrp3 controls nucleosome positioning to suppress non-coding transcription in eu- and heterochromatin [MNase-Seq]

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Spt6 regulates intragenic and antisense transcription, nucleosome positioning, and histone modifications genome-wide in fission yeast [Mnase-seq]

Project description:Spt6 is a highly conserved histone chaperone that interacts directly with both RNA polymerase II and histones to regulate gene expression. To gain a comprehensive understanding of the requirements for this critical factor, we have performed genome-wide analyses of transcription, chromatin structure, and histone modifications in an S. pombe spt6 mutant. Our results demonstrate several dramatic changes to transcription and chromatin structure in the spt6 mutant, including an elevation of antisense transcripts at over 70 percent of all genes and general loss of the +1 nucleosome. Furthermore, Spt6 is required for the trimethylation of histone H3 on lysines 4 and 36, marks associated with active transcription. Taken together, our results indicate that Spt6 is critical for the accuracy of transcription and the integrity of chromatin, likely via its direct interactions with RNA polymerase II and histones. MNase-seq experiments were performed on wild type and spt6-1 strains in replicate at two different MNase concentrations

2013-10-09 | E-GEOD-49572 | biostudies-arrayexpress

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Project description:High resolution maps of nucleosome modifications

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