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Saccharomyces cerevisiae

ABSTRACT: Dynamics of yeast ISWI and CHD chromatin remodeler genomic association (part 1)

PROVIDER: PRJNA170934 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR908282_1.fastq.gz	Fastqsanger.gz
	SRR908282_2.fastq.gz	Fastqsanger.gz
	SRR908283_1.fastq.gz	Fastqsanger.gz
	SRR908283_2.fastq.gz	Fastqsanger.gz
	SRR908284_1.fastq.gz	Fastqsanger.gz

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Project description:Dynamics of yeast ISWI and CHD chromatin remodeler genomic association (part 2)

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Dynamics of yeast ISWI and CHD chromatin remodeler genomic association (part 1)

Project description:Chromatin remodelers influence genetic processes by altering nucleosome occupancy, positioning, and composition. In vitro, yeast ISWI and CHD remodelers require > 20 bp of extranucleosomal DNA for remodeling, but linker DNA in S. cerevisiae averages < 20 bp. To resolve this paradox, we have mapped the genomic distributions of the yeast Isw1, Isw2, and Chd1 remodelers at base-pair resolution. Surprisingly, remodelers are highly enriched at promoter nucleosome depleted regions (5' NDRs), where they bind to regions of extended linker DNA. Remodelers are also enriched in the bodies of genes displaying high nucleosome turnover. We hypothesize that remodelers bind but do not act at 5' NDRs, remaining in physical proximity to gene bodies, where they act on regions of transient nucleosome depletion following transcriptional elongation. We have analyzed the dynamics of yeast ISWI and CHD chromatin remodeler genomic association at base-pair resolution using native chromatin immunoprecipitation followed by sequencing (N-ChIP-seq).

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Project description:Chromatin remodeling is a general mechanism involved in DNA-dependent processes, including gene expression regulation. ISWI ATPase is the catalytic subunit in diverse chromatin remodeling complexes that changing histone–DNA interactions and therefore play a pivotal role in different nuclear processes. Here, the ISWI remodeler was fused to GFP (NH and CO fusions) and its partners were determined by affinity purification-mass spectrometry (MS) assay. This approach identified known ISWI partners (NLP, RCCP and FYRP), previously characterized in T. brucei, and new components of TcISWI complex (DRBD2, DHH1 and proteins containing SMC domains).

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Project description:The positioning of the nucleosome by ATP-dependent nucleosome remodelers provides the fundamental chromatin environment for the regulation of diverse cellular processes acting on the underlying DNA. Here, we report that the fission yeast CHD remodeler, Hrp3, is a global regulator that drives higher-order chromatin structure and genomic stability. The loss of Hrp3 resulted in the production of antisense transcripts and perturbation of the nucleosome in an ATPase mutant of Hrp3 was also associated with destabilization of the DNA-histone interaction. Furthermore, the effect of Hrp3 in the pericentric region was found to be accomplished via a physical interaction with Swi6, and appeared to cooperate with other heterochromatin factors for gene silencing. Taken together, our data indicate that a well-positioned nucleosome is important for the spatial-temporal control of transcription-associated processes, and show that this is accomplished by the chromatin remodeler, Hrp3, in fission yeast. Two-condition experiment, Mutant vs Wild-type (control)

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