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Schizosaccharomyces pombe

ABSTRACT: Genome wide map of heterochromatin state in fission yeast Schizosaccharomcyces pombe (S. pombe)

PROVIDER: PRJNA260380 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR1565924.fastq.gz	Fastqsanger.gz
	SRR1565925.fastq.gz	Fastqsanger.gz

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Genome wide map of heterochromatin state in fission yeast Schizosaccharomyces pombe

Project description:Genome wide map of heterochromatin state in fission yeast Schizosaccharomyces pombe via 4 different strains

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Genome wide map of heterochromatin state in fission yeast Schizosaccharomyces pombe

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Heat-shock molecular chaperone Hsp90 is involved in heterochromatin assembly in Schizosaccharomyces pombe.

Project description:Here, we report the high-throughput profiling of histone modification (H3K9me2) in fission yeast Schizosaccharomyces pombe. We generated genome-wide H3K9me2 maps of fission yeast mutants in swo1-26 (temperature sensitive, ts) cells at 25℃ and 37℃. We find that H3K9me2 enrichment at heterochromatin regions, especially at the mating-type locus and subtelomeres, is compromised, suggesting heterochromatin assembly defects.

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Project description:Hrp3_Purification from Schizosaccharomyces pombe 972h- Eukaryotic genome is composed of repeating units of nucleosomes to form chromatin arrays. A canonical gene is marked by nucleosome free region (NFR) at its 5’ end followed by uniformly spaced arrays of nucleosomes. In fission yeast we show both biochemically and in vivo that both Hrp1 and Hrp3 are key determinants of uniform spacing of genic arrays.

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Mapping of Rec12 oligonucleotides in Schizosaccharomyces pombe

Project description:Meiotic recombination facilitates accurate pairing and faithful segregation of homologous chromosomes by forming physical connections (crossovers) between homologs. Developmentally programmed DNA double-strand breaks (DSBs) generated by Spo11 protein (Rec12 in fission yeast) initiate meiotic recombination. Until recently, attempts to address the basis of the highly non-random distribution of DSBs on a genome-wide scale have been limited to 0.1–1 kb resolution of DSB position. We have assessed individual DSB events across the Schizosaccharomyces pombe genome at near-nucleotide resolution by deep-sequencing the short oligonucleotides connected to Rec12 following DNA cleavage. The single oligonucleotide size-class generated by Rec12 allowed us to effectively analyze all break events. Our high-resolution DSB map shows that the influence of underlying nucleotide sequence and chromosomal architecture differs in multiple ways from that in budding yeast. Rec12 action is not strongly restricted to nucleosome-depleted regions but is nevertheless spatially biased with respect to chromatin structure. Furthermore, we find strong evidence across the genome for differential DSB repair previously predicted to account for crossover invariance (constant cM/kb in spite of DSB hotspots). Our genome-wide analyses demonstrate evolutionarily fluid factors contributing to crossover initiation and its regulation.

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Project description:We determined the strand-specific transcriptome of the fission yeast S. pombe under multiple growth conditions using a novel RNA/DNA hybridization mapping (HybMap) technique. HybMap uses an antibody against an RNA/DNA hybrid to detect RNA molecules hybridized to a high density DNA oligonucleotide tiling microarray. HybMap exhibited exceptional dynamic range and reproducibility, and clearly revealed coding, non-coding and structural RNAs, as well as new RNAs conserved in distant yeast species. Virtually the entire euchromatic genome (including intergenics) is transcribed, with heterochromatin dampening intergenic transcription. Transcriptomes of alternative growth conditions reveal changes in both coding and non-coding RNAs. Interestingly, our analysis reveals large numbers of non-coding RNAs, extensive antisense transcription, new properties of antisense transcripts, and induced divergent transcription. Furthermore, HybMap informed the efficiency and locations of RNA splicing genome-wide. Finally, a remarkable feature is observed at heterochromatin boundaries inside centromeres; strand-specific transcription islands around tRNAs. These new features are discussed in terms of organism fitness and transcriptome evolution. Keywords: yeast, gene expression, bioinformatics

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