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Genomic-wide Spi-C binding in mouse 38B9 cells

ABSTRACT: We determined the genome-wide binding of the ETS transcription factor Spi-C with target genes using chromatin immunoprecipitation and next generation sequencing (ChIP-seq)

ORGANISM(S): Mus musculus

PROVIDER: GSE115593 | GEO | 2020/04/01

REPOSITORIES: GEO

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ETS trancription factors PU.1 and Spi-B binding in mouse lymphoma cells

Project description:Spi-B and PU.1 are highly related members of the E26-transformation-specific (ETS) family of transcription factors that have similar, but not identical, functions in B cell development. PU.1 and Spi-B are both expressed at high levels in lymphoma cell lines. We hypothesized that Spi-B and PU.1 occupy similar sites in the genome. To determine binding sites of Spi-B and PU.1, WEHI-279 mouse lymphoma cells were infected with retroviral vectors encoding 3XFLAG-tagged PU.1 or Spi-B. Anti-FLAG chromatin immunoprecipitation followed by next generation sequencing (ChIP-seq) was performed. Both transcription factors occupied approximately 2000 sites in the genome, and approximately half of these sites were bound by both factors while the other sites were unique to each factor.

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Genomic-wide Spi-C binding in mouse 38B9 cells

Project description:Genomic-wide Spi-C binding in mouse 38B9 cells

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Project description:Acute leukemia are characterized by deregulation of transcriptional networks that control the lineage specificity of gene expression. The aberrant overexpression of the Spi-1/PU.1 transcription factor leads to erythroleukemia. To determine how Spi-1 mechanistically influences the transcriptional program, we combined a ChIP-seq analysis with transcriptional profiling in cells from an erythroleukemic mouse model. We show that Spi-1 displays a selective DNA-binding that does not often cause transcriptional modulation. We report that Spi-1 controls transcriptional activation and repression through distinct Spi-1 recruitment to chromatin. We revealed several parameters impacting on Spi-1-mediated transcriptional activation. Gene activation is facilitated by Spi-1 occupancy close to transcriptional starting site of genes devoid of CGIs. Moreover, in those regions Spi-1 acts by binding to multiple motifs tightly clustered and with similar orientation. Finally, in contrast to the myeloid and lymphoid B cells in which Spi-1 exerts a physiological activity, in the erythroleukemic cells, lineage-specific cooperating factors do not play a prevalent role in Spi-1-mediated transcriptional activation. Thus, our work describes a new mechanism of gene activation through clustered site occupancy of Spi-1 particularly relevant in regard to the strong expression of Spi-1 in the erythroleukemic cells.

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Project description:The MYCN locus is amplified in about half of high-risk neuroblastoma tumors. To identify genomic loci occupied by MYCN protein in the MYCN-amplified neuroblastoma cell lines NGP, Kelly and NB-1643, we performed chromatin immunoprecipitation coupled with Next-Generation Sequencing (ChIP-seq) using an anti-MYCN antibody.

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