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Polycomb Cbx orthologs mediate the balance between Hematopoietic Stem Cell self-renewal and differentiation

ABSTRACT: By genome-wide ChIP-seq analyses we show that Cbx7 and Cbx8 share ~95% of their targets in bone marrow cells. Cbx7 and Cbx8 have only ~200 targets that are not overlapping between the two proteins. These distinct Cbx7 and Cbx8 targets show reciprocal expression patterns along hematopoietic differentiation.

ORGANISM(S): Mus musculus

PROVIDER: GSE36658 | GEO | 2012/12/21

SECONDARY ACCESSION(S): PRJNA153665

REPOSITORIES: GEO

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Polycomb Cbx orthologs mediate the balance between Hematopoietic Stem Cell self-renewal and differentiation

Project description:By genome-wide ChIP-seq analyses we show that Cbx7 and Cbx8 share ~95% of their targets in bone marrow cells. Cbx7 and Cbx8 have only ~200 targets that are not overlapping between the two proteins. These distinct Cbx7 and Cbx8 targets show reciprocal expression patterns along hematopoietic differentiation. Overexpression of empty vector (negative control), flag-Cbx7 and flag-Cbx8 in 5-FU treated bone marrow cells (progenitor and stem cells), followed by 1 week culture and subsequent ChIP using flag-M2 agarose beads.

2012-12-21 | E-GEOD-36658 | biostudies-arrayexpress

Genome wide co-localization of Polycomb orthologs and their effects on gene expression in human fibroblasts

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Genome wide co-localization of Polycomb orthologs and their effects on gene expression in human fibroblasts

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A Cbx8-containing Polycomb complex facilitates gene activation during ES cell differentiation [ChIP-Seq]

Project description:Polycomb proteins play an essential role in maintaining the repression of developmental genes in self-renewing embryonic stem cells. The exact mechanism allowing the derepression of polycomb target genes during cell differentiation remains unclear. Here, we show that several differentiation genes transiently recruit a Cbx8-containing Polycomb repressive complex (PRC) 1 during their early activation. Depletion of Cbx8 partially impairs the transcriptional activation of these genes. This correlates with a reduction in low but detectable levels of histone H3 lysine 27 acetylation. Prolonged gene activation results in eviction of PRC1 despite persisting H3K27me3. The composition of PRC1 is highly modular and changes when ES cells commit to differentiation. We further demonstrate that the exchange of Cbx7 for Cbx8 is required for the effective activation of differentiation genes. Taken together our results establish a function for a Cbx8-containing complex in facilitating the transition from a Polycomb-repressed chromatin state to an active state. As this affects several key regulatory differentiation genes this mechanism is likely to contribute to the robust execution of differentiation programs. Examination of cbx8 in ES E14 mouse cells in 2 condition before and after 72h stimulation with retinoic acid compared with IgG

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A Cbx8-containing Polycomb complex facilitates gene activation during ES cell differentiation [ChIP-Seq]

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Non-Overlapping Functions of the Polycomb group Cbx Family of Proteins in Embryonic Stem Cells

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Project description:The polycomb group protein, CBX8, is a neuron-specific component of Polycomb repressive complex 1 (PRC1) in the adult olfactory epithelium. We performed loss of function assays in an in vitro model of the regeneratng olfactory epithelium to determine the role of CBX8 in adult olfactory neurogenesis. Whole-transcriptome analysis highlighted the importance of CBX8-PRC1 in the regulation of adult neurogenesis in the olfactory epithelium.

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A Cbx8-containing Polycomb complex facilitates gene activation during ES cell differentiation [Agilent Array]

Project description:Polycomb proteins play an essential role in maintaining the repression of developmental genes in self-renewing embryonic stem cells. The exact mechanism allowing the derepression of polycomb target genes during cell differentiation remains unclear. Here, we show that several differentiation genes transiently recruit a Cbx8-containing Polycomb repressive complex (PRC) 1 during their early activation. Depletion of Cbx8 partially impairs the transcriptional activation of these genes. This correlates with a reduction in low but detectable levels of histone H3 lysine 27 acetylation. Prolonged gene activation results in eviction of PRC1 despite persisting H3K27me3. The composition of PRC1 is highly modular and changes when ES cells commit to differentiation. We further demonstrate that the exchange of Cbx7 for Cbx8 is required for the effective activation of differentiation genes. Taken together our results establish a function for a Cbx8-containing complex in facilitating the transition from a Polycomb-repressed chromatin state to an active state. As this affects several key regulatory differentiation genes this mechanism is likely to contribute to the robust execution of differentiation programs. Four biological replicates were used for each condition (untreated and after 72h of retinoic acid stimulation) and samples were prepared and hybridized to SurePrint G3 Gene Expression Microarrays (Agilent technologies) following the supplier's instructions. Analyses were essentially performed as described (Uribesalgo et al. 2011) selecting differentially expressed probes with a FDR of 0.05 and fold change of > 1.5.

2014-11-04 | E-GEOD-54051 | biostudies-arrayexpress

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