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Genome wide ChIP-seq analysis of human TOP2B occupancy in MCF7 breast cancer epithelial cells

ABSTRACT: TOP2B is involved in transcriptional initiation in response to nuclear hormone ligands and plays a role in transcriptional elongation. Whole genome TOP2B ChIP-seq was carried out on human MCF7 cells in the presence and absence of the nuclear hormone estradiol. Three peak calling methods were used and the peaks identified by at least two methods were analyzed further. Approximately half of the peaks fell either within a gene or within 5Kb of a transcription start site. The coincidence of TOP2B peaks and gene promoters was analyzed; TOP2B peaks were less frequently associated with promoters in estradiol treated than in control cells, suggesting a role of TOP2B in repression of transcription or a transient role in estradiol induced transcriptional changes.

ORGANISM(S): Homo sapiens

PROVIDER: GSE66753 | GEO | 2015/09/21

SECONDARY ACCESSION(S): PRJNA277863

REPOSITORIES: GEO

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Genome wide ChIP-seq analysis of human TOP2B occupancy in MCF7 breast cancer epithelial cells

Project description:TOP2B is involved in transcriptional initiation in response to nuclear hormone ligands and plays a role in transcriptional elongation. Whole genome TOP2B ChIP-seq was carried out on human MCF7 cells in the presence and absence of the nuclear hormone estradiol. Three peak calling methods were used and the peaks identified by at least two methods were analyzed further. Approximately half of the peaks fell either within a gene or within 5Kb of a transcription start site. The coincidence of TOP2B peaks and gene promoters was analyzed; TOP2B peaks were less frequently associated with promoters in estradiol treated than in control cells, suggesting a role of TOP2B in repression of transcription or a transient role in estradiol induced transcriptional changes. Whole genome TOP2B ChIP-seq was carried out on human MCF7 cells in the presence (30 mins exposure) and absence of the nuclear hormone estradiol. "Input" control samples were also sequenced for background detection and comparison.

2015-09-21 | E-GEOD-66753 | biostudies-arrayexpress

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Project description:TOP2B is involved in transcriptional initiation in response to nuclear hormone ligands and plays a role in transcriptional elongation. Whole genome TOP2B ChIP-seq was carried out on human KG-1 cells in the presence and absence of the topoisomerase inhibitors mitoxantone and etoposide. Chromatin was assayed for TOP2B occupancy by peak calling with SISSRs and MACS.

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Mapping catalytically engaged TOP2B in neurons reveals the principles of topoisomerase action within the genome [fastGRO]

Project description:Topoisomerase IIb (TOP2B) is essential for neural development and function, yet its precise molecular roles remain poorly understood. Here we trapped catalytically engaged TOP2B in DNA cleavage complexes (TOP2Bccs) and mapped their positions genome-wide in cultured mouse cortical neurons. We report that chromosome compartments set the threshold of TOP2B activity within the genome, while specific nucleosome configurations stimulate TOP2B activity within strongly transcribed regions and enhancers. Highly expressed genes that are devoid of usually associated chromatin marks, such as H3K36me3, are deficient in TOP2B activity, indicating that TOP2B may be inefficient at sensing transcription-generated torsional stress directly. Active promoters and the transcription start sites (TSS) with high RNA polymerase II (RNAPII) occupancy show elevated TOP2B ChIP-seq signals but are depleted in TOP2Bccs, indicating that TOP2B is held inactive at active promoters. Surprisingly, TOP2B inhibition with etoposide increased nascent transcription at highly expressed genes and enhancers. While ETP treatment reduced nascent transcription within long genes, these effects were independent of transcript length and instead correlated with the presence of intragenic enhancers. Together these results provide insights into the epigenetic regulation of topoisomerase activity and reveal new roles for TOP2B in neuronal transcriptional regulation.

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TOP2B binding and enzymatic activity on promoters and introns modulates multiple oncogenes in human gliomas [ATAC-seq]

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