Binding of the Capicua repressor in response to pulses of ERK signaling in the early Drosophila embryo
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA540683 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR8997110.fastq.gz | Fastqsanger.gz | |||
| SRR8997120.fastq.gz | Fastqsanger.gz | |||
| SRR8997130.fastq.gz | Fastqsanger.gz | |||
| SRR8997140.fastq.gz | Fastqsanger.gz | |||
| SRR8997111.fastq.gz | Fastqsanger.gz |
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Project description:We have measured by ChIP-seq the binding of Capicua transcriptional repressor (Cic) in Drosophila melanogaster embryos at early nuclear cycle 14. We compared binding in response to ERK activation, utilizing optogenetics.
2020-03-05 | GSE130584 | GEO
Project description:Global phosphoproteomics can reveal signaling cascades in unprecedented detail. The SCF/KIT axis represents a vital hematopoietic receptor tyrosine kinase (RTK) system with gain-of-function mutations prompting the development of mastocytosis and leukemia. Here, we employed a label-free phosphoproteomics profiling strategy to provide the first comprehensive portrayal of SCF-triggered phosphosignaling. Employing untransformed skin-derived mast cells expressing vast amounts of KIT, we uncover around 10,500 class-I-phosphosites following ligand-induced KIT dimerization. Apart from STAT5, the MEK/ERK cascade (including upstream and downstream events) stood out as highly stimulatable by SCF compared to less impacted PI3K/Akt>p38>JNK, a pattern validated by time-resolved immunoblotting. Direct comparison between MEK/ERKÕs and PI3KÕs support of basic programs (anti-apoptosis, cell cycle progression) revealed equipotency with substantial redundancy between the modules. In functional outputs, ERK showed dominance over PI3K regarding cytokine stimulation (TNF-a, IL-8, LIF, OSM) and was the only contributor in the induction of immediate early genes (Fos, JunB, Egr1). Our proteome-wide screen also found Å1,000 phosphosites currently undescribed in databases, pertaining to multiple protein classes. Among candidates, capicua (and components of its network) experienced massive phosphorylation by SCF. Perturbation with capicua by RNA interference unveiled its function as a potent KIT repressor, whose deregulation may contribute to the development of mastocytosis. We demonstrate the utility of an unbiased approach to uncover single protein entities and entire networks activated by RTKs, that can be surveyed experimentally. This rich resource enhances our understanding of RTK-elicited signaling networks and can serve as a benchmark to identify pathological processes, e.g. under circumstances of KIT deregulation.
2022-11-15 | PXD028252 | Pride
Project description:The highly conserved ERK cascade controls development and physiology and is genetically deregulated in human birth defects, neurocognitive disorders, and cancers. While the list of the known ERK functions in different tissues and organisms is vast and steadily growing, the full spectrum of processes controlled by any specific ERK activation event remains unknown. Here we show how new ERK functions can be systematically identified using targeted perturbations and global readouts of cell signaling systems. Our experimental model is the early Drosophila embryo, where ERK activation at the embryonic poles has thus far only been associated with transcriptional patterning of the terminal structures of the future larva. Based on the phosphoproteomic profiling after acute optogenetic perturbations of ERK signaling, we demonstrate that ERK activation at the poles is also critical for maintaining the speed and synchrony of embryonic cleavage cell cycles throughout the embryo. The presented approach sets the stage for a more complete understanding of signaling systems in health and disease.
2024-09-03 | PXD043371 | Pride
Project description:Activation of Map kinase/Erk signalling downstream of fibroblast growth factor (Fgf) tyrosine kinase receptors regulates gene expression required for mesoderm induction and patterning of the anteroposterior axis during Xenopus development. We have proposed that a subset of Fgf target genes are activated in the embyo in response to inhibition of a transcriptional repressor. Here we investigate the hypothesis that Cic (Capicua), which was originally identified as a transcriptional repressor negatively regulated by receptor tyrosine kinase/Erk signalling in Drosophila, is involved in regulating Fgf target gene expression in Xenopus. We characterise Xenopus Cic and show that it is widely expressed in the embryo. Fgf overexpression or ectodermal wounding, both of which potently activate Erk, reduce Cic protein levels in embryonic cells. A similar mechanism of Cic protein degradation downstream of the Torso receptor tyrosine kinase receptor negatively regulates Cic activity in Drosophila. In keeping with our hypothesis, we show that Cic knockdown and Fgf overexpression have overlapping effects on embryo development and gene expression. Transcriptomic analysis identifies a cohort of genes that are up-regulated by Fgf overexpression and Cic knockdown. We investigate two of these genes, fos and rasl11b, which, respectively, encode a leucine zipper transcription factor and a ras family GTPase, as putative targets of the proposed Fgf/Erk/Cic axis. We identify Cic consensus binding sites in a highly conserved region of intron 1 in the fos gene and Cic sites in the upstream regions of several other Fgf/Cic co-regulated genes, including rasl11b. We show that expression of fos and rasl11b is blocked in the early mesoderm when Fgf and Erk signalling is inhibited. In addition, we show that fos and rasl11b expression is associated with the Fgf independent activation of Erk at the site of ectodermal wounding. Our data support a role for a Fgf/Erk/Cic axis in regulating a subset of Fgf target genes during gastrulation and is suggestive that Erk signalling is involved in regulating Cic target genes at the site of ectodermal wounding.
2023-05-05 | GSE228699 | GEO
Project description:Analysis of cerebella from Capicua (Cic) mutant mice and wild-type controls at 28 days of age (P28). Spinocerebellar ataxia type 1 (SCA1) is a fatal neurodegenerative disease caused by expansion of a translated CAG repeat in Ataxin-1 (ATXN1). The transcriptional repressor Cic binds directly to Atxn1 and plays a key role in SCA1 pathogenesis. Two isoforms of Cic, long (Cic-L) and short (Cic-S), are transcribed from alternative promoters. Using embryonic stem cells in which the Cic locus was targeted by an insertion of a genetrap cassette between exon 1 of the Cic-L isoform and exon 1 of the Cic-S isoform, we generated mice that carried this allele and backcrossed these onto a Swiss Webster (CD-1) strain for >6 generations. The resulting Cic-L-/- mice completely lack the Cic-L isoform with ~10% of Cic-S remaining. These data were used to compare with previous microarray data to determine the Cic-depedent pathogenic mechanisms in SCA1. Total RNA from cerebella of wild-type (n=4) and Capicua mutant mice (n=4) at 28 days of age was prepared and labeled according the manufacturer's protocols for the Affymetrix Mouse Gene 1.0 ST Array.
2011-11-07 | E-GEOD-32051 | biostudies-arrayexpress
Project description:Extracellular signal-regulated kinase (ERK) coordinates cellular responses to a range of stimuli by phosphorylating its numerous substrates. One of these substrates, Capicua (Cic), is a transcriptional repressor that was first identified in Drosophila and has been implicated in a number of human diseases. Here we use a chemical biology approach to map the binding interface of ERK and Cic. The noncanonical amino acid p-azidophenylalanine (AzF) was introduced into the ERK-binding region of Drosophila Cic, and photocrosslinking and tandem mass spectrometry were used to pinpoint its binding site on ERK. We also identified the ERK-binding region of human Cic and showed that it binds to the same site on ERK despite lacking conservation with the Drosophila Cic binding region. Finally, we mapped the amino acids involved in human Cic binding to ERK using AzF-labeled ERK. These results reveal the molecular details of the ERK-Cic interaction and demonstrate that the photocrosslinking approach is complementary to existing methods for mapping kinase-substrate binding interfaces.
| S-EPMC4507193 | biostudies-literature
Project description:HOX transcription factors are members of an evolutionarily conserved family of proteins required for the establishment of the anteroposterior body axis during bilaterian development. Although they are often deregulated in cancers, the molecular mechanisms by which they act as oncogenes or tumor suppressor genes are only partially understood. Since the MAPK/ERK signaling pathway is deregulated in most cancers, we aimed at apprehending if and how Hox proteins interact with ERK oncogenicity. Using an in vivo neoplasia model in the chicken embryo that we have developed, consisting in the overactivation of the ERK1/2 kinases in the trunk neural tube, we analyzed the consequences of HOXB8 gain of function at morphological and transcriptional level in this model. We found that HOXB8 acts as a tumor suppressor, counteracting ERK-induced neoplasia. HOXB8 tumor suppressor function in this model relies on a large reversion of the oncogenic transcriptome induced by ERK. In addition to showing that HOXB8 protein controls the transcriptional responsiveness to ERK oncogenic signaling, our study identified new downstream targets of ERK oncogenic activation in an in vivo context that could provide clues for therapeutic strategies.
2021-08-17 | GSE182076 | GEO
Project description:Early detection of viral infection and rapid activation of host antiviral defenses are critical for limiting viral replication and spread. At a cellular level, this is achieved through host pattern recognition receptors that sense viral nucleic acid as foreign and initiate antiviral defenses through transcriptional upregulation of antiviral cytokines interferons (IFNs) and interferon stimulated genes (ISGs). However, aberrant production of IFN in the absence of viral infection leads to auto-inflammation and can be detrimental to the host. Here, we show that the DNA binding transcriptional repressor complex composed of Capicua (CIC) and Ataxin-1 like (ATXN1L) bind to 8-nucleotide motif near IFN and ISG promoters and block aberrant expression under homeostasis. However, during respiratory viral infections, this active repression is relieved by rapid degradation of the CIC-ATXN1L complex via the activation Mitogen‑activated protein kinase (MAPK) pathway, thereby priming the host cells ready to mount robust antiviral responses through canonical interferon regulatory factors (IRF), and signal transducer and activator of transcription (STAT) transcription factors. Importantly, murine Cic-Atxn1L also repress expression from IFN and ISGs promoters, demonstrating the conservation of this regulatory mechanism in murine species. Together, our studies define a new paradigm for regulation of IFN and ISGs through the evolutionarily conserved CIC-ATXN1L DNA binding transcription repressor complex under homeostasis and viral infection conditions.
2025-03-24 | GSE271897 | GEO
Project description:Early detection of viral infection and rapid activation of host antiviral defenses are critical for limiting viral replication and spread. At a cellular level, this is achieved through host pattern recognition receptors that sense viral nucleic acid as foreign and initiate antiviral defenses through transcriptional upregulation of antiviral cytokines interferons (IFNs) and interferon stimulated genes (ISGs). However, aberrant production of IFN in the absence of viral infection leads to auto-inflammation and can be detrimental to the host. Here, we show that the DNA binding transcriptional repressor complex composed of Capicua (CIC) and Ataxin-1 like (ATXN1L) bind to 8-nucleotide motif near IFN and ISG promoters and block aberrant expression under homeostasis. However, during respiratory viral infections, this active repression is relieved by rapid degradation of the CIC-ATXN1L complex via the activation Mitogen‑activated protein kinase (MAPK) pathway, thereby priming the host cells ready to mount robust antiviral responses through canonical interferon regulatory factors (IRF), and signal transducer and activator of transcription (STAT) transcription factors. Importantly, murine Cic-Atxn1L also repress expression from IFN and ISGs promoters, demonstrating the conservation of this regulatory mechanism in murine species. Together, our studies define a new paradigm for regulation of IFN and ISGs through the evolutionarily conserved CIC-ATXN1L DNA binding transcription repressor complex under homeostasis and viral infection conditions.
2025-03-24 | GSE271899 | GEO
Project description:Early detection of viral infection and rapid activation of host antiviral defenses are critical for limiting viral replication and spread. At a cellular level, this is achieved through host pattern recognition receptors that sense viral nucleic acid as foreign and initiate antiviral defenses through transcriptional upregulation of antiviral cytokines interferons (IFNs) and interferon stimulated genes (ISGs). However, aberrant production of IFN in the absence of viral infection leads to auto-inflammation and can be detrimental to the host. Here, we show that the DNA binding transcriptional repressor complex composed of Capicua (CIC) and Ataxin-1 like (ATXN1L) bind to 8-nucleotide motif near IFN and ISG promoters and block aberrant expression under homeostasis. However, during respiratory viral infections, this active repression is relieved by rapid degradation of the CIC-ATXN1L complex via the activation Mitogen‑activated protein kinase (MAPK) pathway, thereby priming the host cells ready to mount robust antiviral responses through canonical interferon regulatory factors (IRF), and signal transducer and activator of transcription (STAT) transcription factors. Importantly, murine Cic-Atxn1L also repress expression from IFN and ISGs promoters, demonstrating the conservation of this regulatory mechanism in murine species. Together, our studies define a new paradigm for regulation of IFN and ISGs through the evolutionarily conserved CIC-ATXN1L DNA binding transcription repressor complex under homeostasis and viral infection conditions.
2025-03-24 | GSE271898 | GEO