Morphogen-signalling modifying factors in Panarthropoda
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PROVIDER: PRJEB28122 | ENA |
REPOSITORIES: ENA
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Project description:BackgroundMorphogen signalling represents a key mechanism of developmental processes during animal development. Previously, several evolutionary conserved morphogen signalling pathways have been identified, and their players such as the morphogen receptors, morphogen modulating factors (MMFs) and the morphogens themselves have been studied. MMFs are factors that regulate morphogen distribution and activity. The interactions of MMFs with different morphogen signalling pathways such as Wnt signalling, Hedgehog (Hh) signalling and Decapentaplegic (Dpp) signalling are complex because some of the MMFs have been shown to interact with more than one signalling pathway, and depending on genetic context, to have different, biphasic or even opposing function. This complicates the interpretation of expression data and functional data of MMFs and may be one reason why data on MMFs in other arthropods than Drosophila are scarce or totally lacking.ResultsAs a first step to a better understanding of the potential roles of MMFs in arthropod development, we investigate here the embryonic expression patterns of division abnormally delayed (dally), dally-like protein (dlp), shifted (shf) and secreted frizzled-related protein 125 (sFRP125) and sFRP34 in the beetle Tribolium castaneum, the spider Parasteatoda tepidariorum, the millipede Glomeris marginata and the onychophoran Euperipatoides kanangrensis. This pioneer study represents the first comprehensive comparative data set of these genes in panarthropods.ConclusionsExpression profiles reveal a high degree of diversity, suggesting that MMFs may represent highly evolvable nodes in otherwise conserved gene regulatory networks. Conserved aspects of MMF expression, however, appear to concern function in segmentation and limb development, two of the key topics of evolutionary developmental research.
| S-EPMC6162966 | biostudies-literature
Project description:Morphogen signalling forms an activity gradient and instructs cell identities in a signalling strength-dependent manner to pattern developing tissues. However, developing tissues also undergo dynamic morphogenesis, which may produce cells with unfit morphogen signalling and consequent noisy morphogen gradient. Here we show that a cell competition-related system corrects such noisy morphogen gradients. Zebrafish imaging analyses of the Wnt/β-catenin signalling gradient, which acts as a morphogen to establish embryonic anterior-posterior patterning, revealed that unfit cells with abnormal Wnt/β-catenin activity spontaneously appear and produce noise in the gradient. Communication between unfit and neighbouring fit cells via cadherin proteins stimulates apoptosis of the unfit cells by activating Smad signalling and reactive oxygen species production. This unfit cell elimination is required for proper Wnt/β-catenin gradient formation and consequent anterior-posterior patterning. Because this gradient controls patterning not only in the embryo but also in adult tissues, this system may support tissue robustness and disease prevention.
2019-09-15 | GSE133526 | GEO
Project description:Morphogen signalling forms an activity gradient and instructs cell identities in a signalling strength-dependent manner to pattern developing tissues. However, developing tissues also undergo dynamic morphogenesis, which may produce cells with unfit morphogen signalling and consequent noisy morphogen gradient. Here we show that a cell competition-related system corrects such noisy morphogen gradients. Zebrafish imaging analyses of the Wnt/β-catenin signalling gradient, which acts as a morphogen to establish embryonic anterior-posterior patterning, revealed that unfit cells with abnormal Wnt/β-catenin activity spontaneously appear and produce noise in the gradient. Communication between unfit and neighbouring fit cells via cadherin proteins stimulates apoptosis of the unfit cells by activating Smad signalling and reactive oxygen species production. This unfit cell elimination is required for proper Wnt/β-catenin gradient formation and consequent anterior-posterior patterning. Because this gradient controls patterning not only in the embryo but also in adult tissues, this system may support tissue robustness and disease prevention.
2024-11-15 | GSE254439 | GEO
Project description:Developing tissues interpret dynamic changes in morphogen activity to generate cell type diversity. To quantitatively study BMP signalling dynamicsin the vertebrateneural tube, we developed a new ES cell differentiation systemtailored for growing tissues. Differentiating cellsform strikingself-organised pattern of dorsal neural tube cell typesdriven by sequential phases of BMP signalling that are observed both in vitro and in vivo.Data-driven biophysical modelling showed that thesedynamics result from coupling fast negative feedbackwithslow positive regulation of signalling bythe specification of an endogenousBMP source.Thus, in contrast to relays that propagate morphogen signalling in space, we uncover a BMP signallingrelay that operates intime. This mechanism allows rapid initial concentration-sensitive response that is robustly terminated, thereby regulating balanced sequential cell type generation.Altogether, our study provides an experimental and theoretical framework to understand how signalling dynamicsis exploited indeveloping tissues.
2024-08-19 | GSE247069 | GEO
Project description:Morphogens choreograph the generation of remarkable cellular diversity in the developing nervous system. Differen-tiation of stem cells toward particular neural cell fates in vitro often relies upon combinatorial modulation of these signaling pathways. However, the lack of a systematic approach to understand morphogen-directed differentiation has precluded the generation of many neural cell populations, and knowledge of the general principles of regional specification remain incomplete. Here, we developed an arrayed screen of 14 morphogen modulators in human neu-ral organoids cultured for over 70 days. Leveraging advances in multiplexed RNA sequencing technology and anno-tated single cell references of the human fetal brain we discovered that this screening approach generated consid-erable regional and cell type diversity across the neural axis. By deconvoluting morphogen-cell type relationships, we extracted design principles of brain region specification, including critical morphogen timing windows and combinatorics yielding an array of neurons with distinct neurotransmitter identities. Tuning GABAergic neural sub-type diversity unexpectedly led to the derivation of primate-specific interneurons. Taken together, this serves as a platform towards an in vitro morphogen atlas of human neural cell differentiation that will bring insights into hu-man development, evolution, and disease.
2023-05-30 | GSE233574 | GEO
Project description:During development, morphogens build tissues by instructing cell fate across long distances. Directly visualizing morphogen transport in situ has been unfeasible, so the molecular mechanisms ensuring successful morphogen delivery remain unclear. To tackle this longstanding problem, we developed a mouse model for compromised Sonic Hedgehog (SHH) morphogen delivery and discovered that endocytic recycling promotes SHH loading into signaling filopodia called cytonemes. We optimized methods to preserve in vivo cytonemes for advanced microscopy and show endogenously-expressed SHH localized to cytonemes in developing mouse neural tubes. Depletion of SHH from neural tube cytonemes alters neuronal cell fates and compromises neurodevelopment. Mutation of the filopodial motor Myosin 10 (MYO10) reduces cytoneme length and density, which corrupts neuronal signaling activity of both SHH and WNT. Combined, these results demonstrate that cytoneme-based signal transport provides essential contributions to morphogen dispersion during mammalian tissue development and suggest MYO10 is a key regulator of cytoneme function.
2024-01-02 | GSE242161 | GEO
Project description:Spatial compartmentalization of signalling imparts source-specific functions on secreted factors.
| PRJNA867361 | ENA
Project description:The morphogen Indian Hedgehog plays a very important role during intestinal embryogenesis, but also maintains homeostasis of the adult gut. Intestinal Indian Hedgehog is expressed by the intestinal epithelium and signals in paracrine manner to fibroblasts in the stromal compartment. Unresolved deletion of Ihh from the intestinal epithelium leads to a severe enterocolitis. We studied the short term changes in the colon upon deletion of Ihh from the epithelial layer.
2017-08-25 | GSE103024 | GEO
Project description:Recording morphogen signals reveals mechanisms underlying gastruloid symmetry breaking
| PRJNA1146327 | ENA