RNA-seq transcriptome profiling of C. elegans mutants defective in IL-17 signaling
Ontology highlight
ABSTRACT:
ORGANISM(S): Caenorhabditis elegans
PROVIDER: GSE144057 | GEO | 2020/03/25
REPOSITORIES: GEO
Similar Datasets
Project description:Here, we show that the activity of the tumor suppressor p53 in the metazoan C. elegans switches organismal development between reproductive growth and dormancy by responding to nutrient availability signaled by the cytokine, ILC-17.1. ILC-17.1-dependent repression of the C. elegans p53 ortholog CEP-1 is required for larval growth and development; ILC-17.1 deficiency activates CEP-1/p53 in post-embryonically dividing progenitor blast cells, decreases glucose utilization and cytochrome C levels, upregulates cell cycle inhibitors, and causes larvae to arrest as stress-resistant, quiescent dauers.
2024-01-30 | GSE229132 | GEO
Project description:Metazoan growth and development requires the coordination of cell cycle progression and metabolism with nutrient availability1-3. Here, we show that in C. elegans, amphid neurons regulate the animals’ developmental decision to continue reproductive growth or arrest as quiescent dauer larvae in response to food, by controlling the activity of C. elegans p53-like ortholog, CEP-1. Specifically, upon food availability, larval neurons secrete a mammalian IL-17 ortholog, ILC-17.1, and ILC-17.1 signaling is needed for C. elegans to progress through development into reproductive adults. ILC-17.1 deficiency activates CEP-1/p53 in larval blast cells, and causes larvae to arrest as stress-resistant, quiescent dauers by activating DAF-16/FOXO, decreasing cytochrome C levels, decreasing glucose utilization and upregulating cell cycle inhibitors. Increasing ILC-17.1 levels represses CEP-1/p53 and promotes anabolic growth, but also inhibits apoptosis upon genotoxic stress. IL-17 also represses p53 in human epithelial cells. These studies describe a role for the tumor suppressor p53-like proteins in controlling developmental quiescence of a metazoan in response to neuronal activity and immunometabolic signals and are relevant to our understanding of neuroimmune mechanisms in cancer. This novel role for p53-like proteins in C. elegans supports the argument that their developmental function was a main driving force in their evolution4,5.
2024-01-30 | GSE218596 | GEO
Project description:The interaction partners of C. elegans soluble IL-17 signaling components were profiled using IP/MS. In vivo interactions were profiled for ACTL-1-FLAG, PIK-1-Myc, MALT-1::GFP, NFKI-1::GFP and their respective controls. Quantification of NFKI-1::GFP interactions was performed by labelling immunoprecipitated proteins using tandem mass tags.
2020-05-27 | PXD018000 | Pride
Project description:The metaphase to anaphase transition is a critical stage of the eukaryotic cell cycle, and, thus, it is highly regulated. Errors during this transition can lead to chromosome segregation defects and death of the organism. In genetic screens for temperature-sensitive maternal effect embryonic lethal (Mel) mutants, we have identified 32 mutants in the nematode Caenorhabditis elegans in which fertilized embryos arrest as one-cell embryos. In these mutant embryos, the oocyte chromosomes arrest in metaphase of meiosis I without transitioning to anaphase or producing polar bodies. An additional block in M phase exit is evidenced by the failure to form pronuclei and the persistence of phosphohistone H3 and MPM-2 antibody staining. Spermatocyte meiosis is also perturbed; primary spermatocytes arrest in metaphase of meiosis I and fail to produce secondary spermatocytes. Analogous mitotic defects cause M phase delays in mitotic germline proliferation. We have named this class of mutants "mat" for metaphase to anaphase transition defective. These mutants, representing six different complementation groups, all map near genes that encode subunits of the anaphase promoting complex or cyclosome, and, here, we show that one of the genes, emb-27, encodes the C. elegans CDC16 ortholog.
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Project description:RNA-seq transcriptome profiling of C. elegans mutants defective in IL-17 signaling
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Project description:Morphogenesis involves coordinated cell migrations and cell shape changes that generate tissues and organs, and organize the body plan. Cell adhesion and the cytoskeleton are important for executing morphogenesis, but their regulation remains poorly understood. As genes required for embryonic morphogenesis may have earlier roles in development, temperature-sensitive embryonic-lethal mutations are useful tools for investigating this process. From a collection of ∼200 such Caenorhabditis elegans mutants, we have identified 17 that have highly penetrant embryonic morphogenesis defects after upshifts from the permissive to the restrictive temperature, just prior to the cell shape changes that mediate elongation of the ovoid embryo into a vermiform larva. Using whole genome sequencing, we identified the causal mutations in seven affected genes. These include three genes that have roles in producing the extracellular matrix, which is known to affect the morphogenesis of epithelial tissues in multicellular organisms: the rib-1 and rib-2 genes encode glycosyltransferases, and the emb-9 gene encodes a collagen subunit. We also used live imaging to characterize epidermal cell shape dynamics in one mutant, or1219ts, and observed cell elongation defects during dorsal intercalation and ventral enclosure that may be responsible for the body elongation defects. These results indicate that our screen has identified factors that influence morphogenesis and provides a platform for advancing our understanding of this fundamental biological process.
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Project description:Interleukin-17 (IL-17) is a major pro-inflammatory cytokine: it mediates responses to pathogens or tissue damage, and drives autoimmune diseases. Little is known about its role in the nervous system. Here we show that IL-17 has neuromodulator-like properties in Caenorhabditis elegans. IL-17 can act directly on neurons to alter their response properties and contribution to behaviour. Using unbiased genetic screens, we delineate an IL-17 signalling pathway and show that it acts in the RMG hub interneurons. Disrupting IL-17 signalling reduces RMG responsiveness to input from oxygen sensors, and renders sustained escape from 21% oxygen transient and contingent on additional stimuli. Over-activating IL-17 receptors abnormally heightens responses to 21% oxygen in RMG neurons and whole animals. IL-17 deficiency can be bypassed by optogenetic stimulation of RMG. Inducing IL-17 expression in adults can rescue mutant defects within 6 h. These findings reveal a non-immunological role of IL-17 modulating circuit function and behaviour.
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Project description:We describe here the results of genetic screens for Caenorhabditis elegans mutants in which a single neuronal fate decision is inappropriately executed. In wild-type animals, the two morphologically bilaterally symmetric gustatory neurons ASE left (ASEL) and ASE right (ASER) undergo a left/right asymmetric diversification in cell fate, manifested by the differential expression of a class of putative chemoreceptors and neuropeptides. Using single cell-specific gfp reporters and screening through a total of almost 120,000 haploid genomes, we isolated 161 mutants that define at least six different classes of mutant phenotypes in which ASEL/R fate is disrupted. Each mutant phenotypic class encompasses one to nine different complementation groups. Besides many alleles of 10 previously described genes, we have identified at least 16 novel "lsy" genes ("laterally symmetric"). Among mutations in known genes, we retrieved four alleles of the miRNA lsy-6 and a gain-of-function mutation in the 3'-UTR of a target of lsy-6, the cog-1 homeobox gene. Using newly found temperature-sensitive alleles of cog-1, we determined that a bistable feedback loop controlling ASEL vs. ASER fate, of which cog-1 is a component, is only transiently required to initiate but not to maintain ASEL and ASER fate. Taken together, our mutant screens identified a broad catalog of genes whose molecular characterization is expected to provide more insight into the complex genetic architecture of a left/right asymmetric neuronal cell fate decision.
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Project description:Insulin signaling plays a central role in the regulation of facilitative glucose transporters (GLUTs) in humans. To establish Caenorhabditis elegans (C. elegans) as a model to study the mechanism underlying insulin regulation of GLUT, we identified that FGT-1 is most likely the only functional GLUT homolog in C. elegans and is ubiquitously expressed. The FGT-1-mediated glucose uptake was almost completely defective in insulin/IGF-like signaling (IIS) mutants daf-2 and age-1, and this defect mainly resulted from the down-regulated FGT-1 protein expression. However, glycosylation may also be involved because OGA-1, an O-GlcNAcase, was essential for the function of FGT-1. Thus, our study showed that C. elegans can be a new powerful model system to study insulin regulation of GLUT.
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Project description:During metazoan development, how cell division and metabolic programs are coordinated with nutrient availability remains unclear. Here, we show that nutrient availability signaled by the neuronal cytokine, ILC-17.1, switches Caenorhabditis elegans development between reproductive growth and dormancy by controlling the activity of the tumor suppressor p53 ortholog, CEP-1. Specifically, upon food availability, ILC-17.1 signaling by amphid neurons promotes glucose utilization and suppresses CEP-1/p53 to allow growth. In the absence of ILC-17.1, CEP-1/p53 is activated, up-regulates cell-cycle inhibitors, decreases phosphofructokinase and cytochrome C expression, and causes larvae to arrest as stress-resistant, quiescent dauers. We propose a model whereby ILC-17.1 signaling links nutrient availability and energy metabolism to cell cycle progression through CEP-1/p53. These studies describe ancestral functions of IL-17 s and the p53 family of proteins and are relevant to our understanding of neuroimmune mechanisms in cancer. They also reveal a DNA damage-independent function of CEP-1/p53 in invertebrate development and support the existence of a previously undescribed C. elegans dauer pathway.
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