Expression data in wt or mutant Drosophila melanogaster embryos
Ontology highlight
ABSTRACT:
ORGANISM(S): Drosophila melanogaster
PROVIDER: GSE48997 | GEO | 2013/07/20
SECONDARY ACCESSION(S): PRJNA212792
REPOSITORIES: GEO
Similar Datasets
Project description:Terminal differentiation of epidermal cells in Drosophila embryos requires the activity of a transcription factor. Svb is necessary and sufficient to induce this process. pri is a regulator of Svb activity, converting it from a repressor into an activator. To characterize the downstream Svb and pri effectors in cell morphogenesis, we performed microarrays in wt, svb -/- (no gene) and pri -/- (svb repressor) mutant conditions. Embryos were selected at a precise 13-15h (after egg laying) stage of development, and manually genotyped for each condition: wt (W samples), svb -/- (R samples) and pri -/- (P samples). 5 independent replicates of 200 embryos are used for each condition. RNA were extracted and hybridized on Affymetrix microarrays.
2013-07-20 | E-GEOD-48997 | biostudies-arrayexpress
Project description:Shavenbaby (Svb) transcription factor is involved in the differenciation of epidermal cells, the homeostasis of intestinal stem cell. Svb is first synthetized as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides Svb Repressor is clived by the proteasoome into a shorter activator protein called Svb Activator (SvbACT). We want in this study determine the effect of the two Svb forms on gene expression and determine the Svb target genes. We performed RNAseq experiment in S2 cell lines which present Svb REP or SvbACT or S2 cell without Svb.
2022-12-14 | GSE199511 | GEO
Project description:Shavenbaby (Svb) transcription factor is involved in the differenciation of epidermal cells, the homeostasis of intestinal stem cell. Svb is first synthetized as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides Svb Repressor is clived by the proteasoome into a shorter activator protein called Svb Activator (SvbACT). We want in this study determine the binding behaviour of the two Svb forms on S2 cells. We performed ChIPseq Svb experiment in S2 cell lines which present Svb REP or SvbACT or S2 cell without Svb.
2022-12-14 | GSE199513 | GEO
Project description:Shavenbaby (Svb) transcription factor is involved in the differenciation of epidermal cells, the homeostasis of intestinal stem cell. Svb is first synthetized as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides Svb Repressor is clived by the proteasoome into a shorter activator protein called Svb Activator (SvbACT). We want in this study determine the binding behaviour of the two Svb forms on S2 cells. We performed ChIPseq histones experiment in S2 cell lines which present Svb REP or SvbACT or S2 cell without Svb.
2022-12-14 | GSE199512 | GEO
Project description:Shavenbaby (Svb) transcription factor is involved in the differenciation of epidermal cells and the homeostasis of intestinal stem cells (ISCs). Svb is produced as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides SvbREP is processed into a shorter activator form (SvbACT) through partial proteasomal degradation of the REP domain. In ISCs, Pri triggers SvbREP to ACT maturation, while SvbREP form accumulates in differentiated enterocytes. The absence of Svb promote the apoptosis of the intestinal stem cells. In ISC, the ectopic expression of SvbREP form promote the differenciation and the SvbACT form overexpression promotes hyperplasia. (Al Hayel, et al 2020) Based on these functional analyses, Svb appears to control ISC survival and behavior, balancing proliferation and differentiation through a molecular switch between its 2 antagonistic isoforms. In this study, we determine the Svb target genes in ISCs. To this aim, we analyze the transcriptomes of ISCs upon modulation of Svb function.
2022-12-14 | GSE199510 | GEO
Project description:Developmental programs are implemented by regulatory interactions between Transcription Factors (TFs) and their target genes, which remain yet poorly understood. While recent studies have focused on regulatory cascades of TFs that govern early development, little is known on how these are selected and controlled the ultimate cellular effectors of terminal differentiation. We addressed this question during late Drosophila embryogenesis when the finely tuned expression of a TF, Ovo/Shavenbaby (Svb), triggers the morphological differentiation of epidermal trichomes. We used chromatin immunoprecipitation and microarray profiling to identify Svb downstream target genes and show that Svb directly regulates a large set of terminal effectors of trichome formation. Functional assays delineated 18 Svb bound sequences driving specific expression of trichome effectors, with highly similar pattern and dynamics. Coupling computational modeling to functional dissection, we further investigated the regulatory logic of these enhancers. We find that these “terminal” enhancers harbor remarkable features with respect to their functional architectures. Trichome enhancers display weak if any clustering of Svb binding sites. Moreover, the in vivo function of each site relies on its intimate context, with a critical importance of the nucleotides flanking Svb binding sites. Finally, we identify additional cis-regulatory motifs, showing a broad diversity of positioning among trichome enhancers, and that critically contribute to their activity. Taken together, these results show that trichome formation is underpinned by unexpectedly diverse modes of regulation, and shed light on the functional architecture of enhancers governing a terminal differentiation program. Chromatin from 12-14 hour old embryos expressing svb tagged with GFP (Kondo T, Plaza S, Zanet J, Benrabah E, Valenti P, Hashimoto Y, Kobayashi S, Payre F, Kageyama Y: Small peptides switch the transcriptional activity of Shavenbaby during Drosophila embryogenesis. Science 2010, 329:336-339) was collected in duplicate. Chromatin was immunoprecipitated using an antiGFP antibody and input chromatin was used as a control.
2013-07-12 | E-GEOD-48791 | biostudies-arrayexpress
Project description:Shavenbaby (Svb) transcription factor is involved in the homeostasis of intestinal stem cells (ISCs), and the differentiation of their enteroblast progeny (EB) into enterocytes (EC). Svb is produced as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides SvbREP is processed into a shorter activator form (SvbACT) through partial proteasomal degradation of the REP domain. In ISCs/EBs, Pri triggers SvbREP to ACT maturation, while SvbREP form accumulates in differentiated enterocytes. The absence of Svb promote the apoptosis of the intestinal stem cells. In ISCs/EBs, the ectopic expression of SvbREP form promotes the differentiation and the overexpression of SvbACT promotes hyperplasia. (Al Hayek, et al 2020) Based on these functional analyses, Svb appears to control ISC/EB survival and behavior, balancing proliferation and differentiation through a molecular switch between its 2 antagonistic isoforms. In this study, we determine the Svb target genes in different cell types along the intestinal cell lineage. This particular metadata sheet refers to early enterocytes (mEC) transcriptomic data (RNAseq) in control condition and upon modulation of Svb function.
2023-12-14 | GSE220560 | GEO
Project description:Shavenbaby (Svb) transcription factor is involved in the homeostasis of intestinal stem cells (ISCs), and the differentiation of their enteroblast progeny (EB) into enterocytes (EC). Svb is produced as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides SvbREP is processed into a shorter activator form (SvbACT) through partial proteasomal degradation of the REP domain. In ISCs/EBs, Pri triggers SvbREP to ACT maturation, while SvbREP form accumulates in differentiated enterocytes. The absence of Svb promote the apoptosis of the intestinal stem cells. In ISCs/EBs, the ectopic expression of SvbREP form promotes the differentiation and the overexpression of SvbACT promotes hyperplasia. (Al Hayek, et al 2020) Based on these functional analyses, Svb appears to control ISC/EB survival and behavior, balancing proliferation and differentiation through a molecular switch between its 2 antagonistic isoforms. In this study, we determine the Svb target genes in different cell types along the intestinal cell lineage. This particular metadata sheet refers to early enterocytes (eEC) transcriptomic data (RNAseq) in control condition and upon modulation of Svb function.
2023-12-14 | GSE220558 | GEO
Project description:Shavenbaby (Svb) transcription factor is involved in the homeostasis of intestinal stem cells (ISCs), and the differentiation of their enteroblast progeny (EB) into enterocytes (EC). Svb is produced as a long repressor protein called SvbRepressor (SvbREP). In presence of Pri peptides SvbREP is processed into a shorter activator form (SvbACT) through partial proteasomal degradation of the REP domain. In ISCs/EBs, Pri triggers SvbREP to ACT maturation, while SvbREP form accumulates in differentiated enterocytes. The absence of Svb promote the apoptosis of the intestinal stem cells. In ISCs/EBs, the ectopic expression of SvbREP form promotes the differentiation and the overexpression of SvbACT promotes hyperplasia. (Al Hayek, et al 2020) Based on these functional analyses, Svb appears to control ISC/EB survival and behavior, balancing proliferation and differentiation through a molecular switch between its 2 antagonistic isoforms. In this study, we determine the Svb target genes in different cell types along the intestinal cell lineage. This particular metadata sheet refers to enteroblast (EB) transcriptomic data (RNAseq) in control condition and upon modulation of Svb function.
2023-12-14 | GSE220323 | GEO
Project description:Developmental programs are implemented by regulatory interactions between Transcription Factors (TFs) and their target genes, which remain yet poorly understood. While recent studies have focused on regulatory cascades of TFs that govern early development, little is known on how these are selected and controlled the ultimate cellular effectors of terminal differentiation. We addressed this question during late Drosophila embryogenesis when the finely tuned expression of a TF, Ovo/Shavenbaby (Svb), triggers the morphological differentiation of epidermal trichomes. We used chromatin immunoprecipitation and microarray profiling to identify Svb downstream target genes and show that Svb directly regulates a large set of terminal effectors of trichome formation. Functional assays delineated 18 Svb bound sequences driving specific expression of trichome effectors, with highly similar pattern and dynamics. Coupling computational modeling to functional dissection, we further investigated the regulatory logic of these enhancers. We find that these “terminal” enhancers harbor remarkable features with respect to their functional architectures. Trichome enhancers display weak if any clustering of Svb binding sites. Moreover, the in vivo function of each site relies on its intimate context, with a critical importance of the nucleotides flanking Svb binding sites. Finally, we identify additional cis-regulatory motifs, showing a broad diversity of positioning among trichome enhancers, and that critically contribute to their activity. Taken together, these results show that trichome formation is underpinned by unexpectedly diverse modes of regulation, and shed light on the functional architecture of enhancers governing a terminal differentiation program.
2013-07-12 | GSE48791 | GEO