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Chromatin remodelers Isw1 and Chd1 maintain chromatin structure during transcription by preventing histone exchange

ABSTRACT: Chromatin remodelers Isw1 and Chd1 maintain chromatin structure during transcription by preventing histone exchange

PROVIDER: PRJNA147595 | ENA |

REPOSITORIES: ENA

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Chromatin remodelers Isw1 and Chd1 maintain chromatin structure during transcription by preventing histone exchange

Project description:This SuperSeries is composed of the following subset Series: GSE32042: Isw1 and Chd1 maintain chromatin organization during transcription GSE32043: Histone exchange in wildtype, isw1, chd1, isw1 chd1 and ioc4 yeast strains GSE32044: Histone H3 K36me3 in wildtype, isw1 and chd1 yeast strains GSE32045: Isw1 and Chd1 maintain chromatin organization during transcription [AcH4 data] GSE36405: Isw1 and Chd1 maintain chromatin organization during transcription [K56ac data] GSE37158: Isw1 and Chd1 maintain chromatin organization during transcription [isw1 chd1 mutant expression] Refer to individual Series

2012-07-24 | E-GEOD-32071 | biostudies-arrayexpress

Histone exchange in wildtype, isw1, chd1, isw1 chd1 and ioc4 yeast strains

Project description:Histone exchange in wildtype, isw1, chd1, isw1 chd1 and ioc4 yeast strains.

2012-07-25 | GSE32043 | GEO

Contrasting roles of the RSC and ISW1/CHD1 chromatin remodelers in RNA polymerase II elongation and termination

Project description:Most yeast genes have a nucleosome-depleted region (NDR) at the promoter and an array of regularly spaced nucleosomes phased relative to the transcription start site. We have examined the interplay between RSC (a conserved essential SWI/SNF-type complex that determines NDR size) and the ISW1, CHD1 and ISW2 nucleosome spacing enzymes in chromatin organization and transcription, using isogenic strains lacking all combinations of these enzymes. The contributions of these remodelers to chromatin organization are largely combinatorial, distinct and non-redundant, supporting a model in which the +1 nucleosome is positioned by RSC and then used as a reference nucleosome by the spacing enzymes. Defective chromatin organization correlates with altered RNA polymerase II (Pol II) distribution. RSC-depleted cells exhibit low levels of elongating Pol II and high levels of terminating Pol II, consistent with defects in both termination and initiation, suggesting that RSC facilitates both. Cells lacking both ISW1 and CHD1 show the opposite Pol II distribution, suggesting elongation and termination defects. These cells have extremely disrupted chromatin, with high levels of close-packed di-nucleosomes near the 5’-ends of genes. We propose that ISW1 and CHD1 facilitate Pol II elongation by separating close-packed nucleosomes and by eliminating long linkers to prevent cryptic initiation.

2019-01-16 | GSE117514 | GEO

Histone exchange in wildtype, isw1, chd1, isw1 chd1 and ioc4 yeast strains

Project description:Histone exchange in wildtype, isw1, chd1, isw1 chd1 and ioc4 yeast strains. Two color experiment. Deletion mutant vs. WT cells. Biological replicates=3 per IP per cell type.

2012-07-24 | E-GEOD-32043 | biostudies-arrayexpress

The ISW1 and CHD1 ATP-dependent chromatin remodelers compete to set nucleosome spacing in vivo

Project description:We addressed the roles of three nucleosome spacing enzymes (ISW1, ISW2 and CHD1) in specifying chromatin organization in S. cerevisiae.

2016-02-17 | GSE69400 | GEO

Contrasting roles of the RSC and ISW1/CHD1 chromatin remodelers in RNA polymerase II elongation and termination

Project description:We addressed the roles of four remodeling machines (ISW1, ISW2, CHD1 and RSC) in specifying the chromatin organization.

2019-01-16 | GSE73428 | GEO

Chromatin remodelers Isw1 and Chd1 maintain chromatin structure during transcription by preventing histone exchange.

Project description: Not available

| S-EPMC3560298 | biostudies-literature

Isw1 and Chd1 maintain chromatin organization during transcription [K56ac data]

Project description:ChIP-chip assays to determine the occupancy of acetylated histone H3 K56 in wildtype, isw1, chd1, isw1 chd1 and ISW1[K227R] yeast.

2012-07-25 | GSE36405 | GEO

The ISW1 and CHD1 ATP-dependent chromatin remodelers compete to set nucleosome spacing in vivo

Project description:We addressed the roles of three nucleosome spacing enzymes (ISW1, ISW2 and CHD1) in specifying chromatin organization in S. cerevisiae. Comparison of budding yeast nucleosome positions obtained using micrococcal nuclease digestion followed by paired-end sequencing (MNase-seq). We sequenced nucleosomes from isogenic strains with the isw1Î, isw2Î or chd1Î mutations in all combinations. We measured gene activity by ChIP-seq for the Rpb3 subunit of RNA polymerase II for some of these mutants.

2016-02-17 | E-GEOD-69400 | biostudies-arrayexpress

Chd1 chromatin remodelers maintain nucleosome organization and repress cryptic transcription

Project description:Proper chromatin organization is essential for defining transcription units and maintaining genomic integrity in eukaryotes. Mutations affecting the chromatin structure can lead to increased cryptic transcription and genomic instability. In this study we found that deletion of the Schizosaccharomyces pombe Chd1-type chromatin remodelers, hrp1 and hrp3, causes strong, genome-wide accumulation of antisense transcripts, while the amount of coding mRNA transcripts is mostly unaffected. Nucleosome mapping revealed a specific role for Chd1-remodelers in the positioning of nucleosomes in gene coding regions. While the arrangement of nucleosomes in promoter regions was similar to WT, nucleosome organization within coding regions was remarkably irregular in hrp1∆hrp3∆ strain. We extended our analysis to other mutations associated with enhanced cryptic transcription activity, such as set2∆, alp13∆, and FACT complex subunit pob3∆. While nucleosomes were severely depleted in the pob3∆ strain, nucleosome positioning was less affected. In sharp contrast, nucleosome organization in the alp13∆ and set2∆ strains was indistinguishable from WT. These data indicate multiple mechanisms in the repression of cryptic promoter activity in eukaryotic cells. Genome-wide profiling of H3K9/K14 acetylation Genome-wide expression analysis of either Alp13-, Set2-, Hrp3 or Hrp1 and Hrp3-deficient cells Genome-wide expression analysis of either Hrp1, Hrp3, or Hrp1 and Hrp3-deficient cells Nucleosome mapping experiments

2012-09-15 | GSE40872 | GEO

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