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E2F4 cooperates with pRB in the development of extra-embryonic, not embryonic, tissues

ABSTRACT: Homozygous mutation of the murine retinoblastoma tumor suppressor gene, Rb, results in embryonic lethality between E13.5 and E15.5 with defects in cellular proliferation, differentiation and apoptosis. Many of these defects are suppressed by mutation of an activating E2F, E2f1 or E2f3, indicating that they are key downstream targets of the retinoblastoma protein, pRB. In this study, we assess how E2F4 contributes to the developmental consequences of pRb-loss. In stark contrast to the activating E2Fs, the homozygous mutation of E2f4 shortened the lifespan of Rb-/- embryos. This resulted from an exacerbation of the placental defect of the Rb-/- mice indicating that E2F4 and pRB cooperate in the development of this tissue. Further analyses indicated that this defect reflects an increase in trophectoderm-like cells. Under conditions where the placenta was wild-type but the embryo mutant for E2f4 and pRb embryos survived to birth and exhibited all of the defects that were observed in the E2f4 and Rb single mutant embryos. Thus, while pRB and E2F4 cooperate in placental development, they play largely non-overlapping roles the development of many embryonic tissues. Keywords: genetically modified tissue comparison

ORGANISM(S): Mus musculus

PROVIDER: GSE13753 | GEO | 2009/06/08

SECONDARY ACCESSION(S): PRJNA109411

REPOSITORIES: GEO

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Transcription profiling of mouse placentas from wild-type and Rb -/- knock-out mice and embronic day 11.5 placentas from wild-type and Rb -/-;E2f4 -/- double knock-outs reveals E2F4 cooperates with pRB in the development of extra-embryonic, not embryonic, tissues

Project description:Homozygous mutation of the murine retinoblastoma tumor suppressor gene, Rb, results in embryonic lethality between E13.5 and E15.5 with defects in cellular proliferation, differentiation and apoptosis. Many of these defects are suppressed by mutation of an activating E2F, E2f1 or E2f3, indicating that they are key downstream targets of the retinoblastoma protein, pRB. In this study, we assess how E2F4 contributes to the developmental consequences of pRb-loss. In stark contrast to the activating E2Fs, the homozygous mutation of E2f4 shortened the lifespan of Rb-/- embryos. This resulted from an exacerbation of the placental defect of the Rb-/- mice indicating that E2F4 and pRB cooperate in the development of this tissue. Further analyses indicated that this defect reflects an increase in trophectoderm-like cells. Under conditions where the placenta was wild-type but the embryo mutant for E2f4 and pRb embryos survived to birth and exhibited all of the defects that were observed in the E2f4 and Rb single mutant embryos. Thus, while pRB and E2F4 cooperate in placental development, they play largely non-overlapping roles the development of many embryonic tissues. Experiment Overall Design: In one experiment, embryonic Day 13.5 placentas from wild-type and Rb -/- knock-out mice were compared. In the second experiment, embronic day 11.5 placentas from wild-type and Rb -/-;E2f4 -/- double knock-out mice were compared.

2009-06-24 | E-GEOD-13753 | biostudies-arrayexpress

Transcription profiling of human T98G cells during cell cycle in T98G

Project description:The mammalian Retinoblastoma (RB) family including pRB, p107, and p130 represses E2F target genes through mechanisms that are not fully understood. In D. melanogaster, RB-dependent repression is mediated in part by the multisubunit protein complex Drosophila RBF, E2F, and Myb (dREAM) that contains homologs of the C. elegans synthetic multivulva class B (synMuvB) gene products. Using an integrated approach combining proteomics, genomics, and bioinformatic analyses, we identified a p130 complex termed DP, RB-like, E2F, and MuvB (DREAM) that contains mammalian homologs of synMuvB proteins LIN-9, LIN-37, LIN-52, LIN-54, and LIN-53/RBBP4. DREAM bound to more than 800 human promoters in G0 and was required for repression of E2F target genes. In S phase, MuvB proteins dissociated from p130 and formed a distinct submodule that bound MYB. This work reveals an evolutionarily conserved multisubunit protein complex that contains p130 and E2F4, but not pRB, and mediates the repression of cell cycle-dependent genes in quiescence. Experiment Overall Design: Gene expression during the cell cycle in T98G cells. Cells were serum starved for 72 hours to induce G0 and then restimuated to enter cell cycle by serum addition. BrdU and FACS was done simultaneously to confirm their cell cycle phase.

2008-06-16 | E-GEOD-8537 | biostudies-arrayexpress

Gene expression profilie during cell cycle in T98G cells

Project description:The mammalian Retinoblastoma (RB) family including pRB, p107, and p130 represses E2F target genes through mechanisms that are not fully understood. In D. melanogaster, RB-dependent repression is mediated in part by the multisubunit protein complex Drosophila RBF, E2F, and Myb (dREAM) that contains homologs of the C. elegans synthetic multivulva class B (synMuvB) gene products. Using an integrated approach combining proteomics, genomics, and bioinformatic analyses, we identified a p130 complex termed DP, RB-like, E2F, and MuvB (DREAM) that contains mammalian homologs of synMuvB proteins LIN-9, LIN-37, LIN-52, LIN-54, and LIN-53/RBBP4. DREAM bound to more than 800 human promoters in G0 and was required for repression of E2F target genes. In S phase, MuvB proteins dissociated from p130 and formed a distinct submodule that bound MYB. This work reveals an evolutionarily conserved multisubunit protein complex that contains p130 and E2F4, but not pRB, and mediates the repression of cell cycle-dependent genes in quiescence. Keywords: Gene expression analysis during cell cycle

2007-07-21 | GSE8537 | GEO

Gene profiling approaches help to define the specific functions of retinoblastoma family in epidermis

Project description:The epidermal-specific ablation of Rb gene leads to increased proliferation, aberrant differentiation, and the disengagement of these processes in vivo and in vitro. These differences in phenotype are more severe with the loss of p107, demonstrating the functional compensation between pRb and p107. As p107 and p130 also exert overlapping functions in epidermis, we have generated Rb(F19/F19)K14cre;Rbl2-/- (pRb-;p130-) mice to analyze possible functional redundancies between pRb and p130. The epidermal phenotype was very similar between pRb- and pRb-;p130- mice, suggesting that pRb and p130 activities are not redundant in epidermis. Importantly, we can correlate the proliferation differences with specific changes in gene expression between pRb-, pRb-;p107- and pRb-;p130- primary keratinocytes using microarray analysis, and explain the phenotypes in the context of altered E2F expression and functionality. Our findings support a model in which the distinct retinoblastoma family members, in conjunction with E2F members, play a central role in regulating epidermal homeostasis through specific or overlapping activities. Keywords: skin, pRb, transgenic mice, p130

2007-11-13 | GSE9562 | GEO

TRANSCRIPTIONAL ACTIVATION BY E2F4 INDEPENDENT OF THE RB FAMILY

Project description:E2F transcription factors are central regulators of cell cycle progression and cell fate decisions in mammalian cells. E2F4 is a transcriptional repressor implicated in cell cycle arrest and whose repressive activity depends on its interaction with members of the RB family. E2F4 often represents the predominant E2F activity in cells. Here we show that E2F4 is important for the proliferation and the survival of mouse embryonic stem cells. In these cells, E2F4 acts in part as a transcriptional activator that promotes the expression of cell cycle genes. Importantly, this role for E2F4 is completely independent of the RB family. Accordingly, an unbiased analysis of the E2F4 interactome shows that E2F4 functionally interacts with chromatin regulators associated with gene activation in RB family-mutant cells. Taken together, our findings uncover a non-canonical role for E2F4 that reveal novel insights into the biology of rapidly dividing cell types.

2019-04-26 | PXD008796 | Pride

Cell cycle exit and terminal differentiation independent of the Rb gene family during embryonic development

Project description:The retinoblastoma cell cycle regulator pRb and the two related proteins p107 and p130 are thought to suppress cancer development both by inhibiting the G1/S transition of the cell cycle in response to growth-arrest signals and by promoting cellular differentiation. Here, we investigated the phenotype of Rb family triple knock-out (TKO) embryonic stem cells as they differentiate in vivo and in culture. Confirming the central role of the Rb gene family in cell cycle progression, TKO mouse embryos did not survive past mid-gestation and differentiating TKO cells displayed increased proliferation and cell death. However, patterning and cell fate determination were largely unaffected in these TKO embryos. Furthermore, a number of TKO cells, including in the neural lineage, were able to exit the cell cycle in G1 and terminally differentiate. This ability of Rb family TKO cells to undergo cell cycle arrest was associated with the repression of target genes for the E2F6 transcription factor, uncovering a pRb-independent control of the G1/S transition of the cell cycle. These results show that the Rb gene family is required for proper embryonic development but is not absolutely essential to induce G1 arrest and differentiation in certain lineages.

2009-09-01 | GSE13408 | GEO

Transcription profiling of mouse epidermis from Rb(F19/F19)K14cre;Rbl2-/- (pRb-;p130-) mutants to analyse functional redundancies between retinoblastoma family members

2008-06-16 | E-GEOD-9562 | biostudies-arrayexpress

Transcription profiling of mouse Rb family triple knock-out (TKO) embryonic stem cells as they differentiate in vivo

2009-09-12 | E-GEOD-13408 | biostudies-arrayexpress

Delineating the Rb1 interactome data and its modulations during cell cycle progression.

Project description:The retinoblastoma (Rb) protein is a potent tumor suppressor which is known to negatively regulate the cell cycle as well as tumor progression. Phosphorylated Rb protein (pRb) has been demonstrated to be in-charge for the key G1 checkpoint, blocking entry into S-phase and thereby the cell growth. This study was designed to capture interacting protein partners of Rb1 as the cell cycle progresses. Rb1 expressing HEK-293 cells were cultured in light, medium and heavy SILAC labels to capture the changes in Rb1 interactome as the cell cycle progressed from G0 to G1S and then to G2 phase, respectively. This data might help in understanding the cell cycle regulatory effect of Rb1 protein and complement the available information on its interacting partners.

2017-09-14 | PXD007708 | Pride

Comparison of Pax6 alpha enhancer Cre-Rblox/lox retinas to Pax6 alpha enhancer Cre-Rblox/lox TET-MYCN retinas at PND12

Project description:The most frequent focal alterations in human retinoblastoma are RB mutation and MYCN amplification. Whether MYCN overexpression drives retinoblastoma has not been assessed in model systems. Here, we show that Rb inactivation collaborates strongly with MYCN overexpression to lead to retinoblastoma in mice. MYCN overexpression in the context of Rb inactivation increased the expression of MYC, E2F and ribosome related gene sets, promoted excessive proliferation and led to retinoblastoma with anaplastic changes. Part of our study compares expression profiles in Rbnull vs Rbnull/MYCN overexpressing retinas collected at 12 days after birth.

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