1
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Mann KE, Panfilio KA. Tissue-Level Integration Overrides Gradations of Differentiating Cell Identity in Beetle Extraembryonic Tissue. Cells 2024; 13:1211. [PMID: 39056793 PMCID: PMC11274815 DOI: 10.3390/cells13141211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Revised: 07/10/2024] [Accepted: 07/10/2024] [Indexed: 07/28/2024] Open
Abstract
During animal embryogenesis, one of the earliest specification events distinguishes extraembryonic (EE) from embryonic tissue fates: the serosa in the case of the insects. While it is well established that the homeodomain transcription factor Zen1 is the critical determinant of the serosa, the subsequent realization of this tissue's identity has not been investigated. Here, we examine serosal differentiation in the beetle Tribolium castaneum based on the quantification of morphological and morphogenetic features, comparing embryos from a Tc-zen1 RNAi dilution series, where complete knockdown results in amnion-only EE tissue identity. We assess features including cell density, tissue boundary morphology, and nuclear size as dynamic readouts for progressive tissue maturation. While some features exhibit an all-or-nothing outcome, other key features show dose-dependent phenotypic responses with trait-specific thresholds. Collectively, these findings provide nuance beyond the known status of Tc-Zen1 as a selector gene for serosal tissue patterning. Overall, our approach illustrates how the analysis of tissue maturation dynamics from live imaging extends but also challenges interpretations based on gene expression data, refining our understanding of tissue identity and when it is achieved.
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Affiliation(s)
- Katie E. Mann
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Kristen A. Panfilio
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
- Department of Molecular Genetics, Institute of Biology, University of Hohenheim, Garbenstr. 30, 70599 Stuttgart, Germany
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2
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Anjum S, Turner L, Atieh Y, Eisenhoffer GT, Davidson L. Assessing mechanical agency during apical apoptotic cell extrusion. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.10.26.564227. [PMID: 37961593 PMCID: PMC10634859 DOI: 10.1101/2023.10.26.564227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Epithelial tissues maintain homeostasis through the continual addition and removal of cells. Homeostasis is necessary for epithelia to maintain barrier function and prevent the accumulation of defective cells. Unfit, excess, and dying cells can be removed from epithelia by the process of extrusion. Controlled cell death and extrusion in the epithelium of the larval zebrafish tail fin coincides with oscillation of cell area, both in the extruding cell and its neighbors. Both cell-autonomous and non-autonomous factors have been proposed to contribute to extrusion but have been challenging to test by experimental approaches. Here we develop a dynamic cell-based biophysical model that recapitulates the process of oscillatory cell extrusion to test and compare the relative contributions of these factors. Our model incorporates the mechanical properties of individual epithelial cells in a two-dimensional simulation as repelling active particles. The area of cells destined to extrude oscillates with varying durations or amplitudes, decreasing their mechanical contribution to the epithelium and surrendering their space to surrounding cells. Quantitative variations in cell shape and size during extrusion are visualized by a hybrid weighted Voronoi tessellation technique that renders individual cell mechanical properties directly into an epithelial sheet. To explore the role of autonomous and non-autonomous mechanics, we vary the biophysical properties and behaviors of extruding cells and neighbors such as the period and amplitude of repulsive forces, cell density, and tissue viscosity. Our data suggest that cell autonomous processes are major contributors to the dynamics of extrusion, with the mechanical microenvironment providing a less pronounced contribution. Our computational model based on in vivo data serves as a tool to provide insights into the cellular dynamics and localized changes in mechanics that promote elimination of unwanted cells from epithelia during homeostatic tissue maintenance.
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Affiliation(s)
- Sommer Anjum
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
| | - Llaran Turner
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Genetics and Epigenetics Graduate Program, University of Texas MD Anderson Cancer Center, UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX, USA
| | - Youmna Atieh
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - George T. Eisenhoffer
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX, USA
- Genetics and Epigenetics Graduate Program, University of Texas MD Anderson Cancer Center, UTHealth Houston Graduate School of Biomedical Sciences, Houston, TX, USA
| | - Lance Davidson
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, PA, 15260, USA
- Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, PA, USA
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3
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Skinner DJ, Jeckel H, Martin AC, Drescher K, Dunkel J. Topological packing statistics of living and nonliving matter. SCIENCE ADVANCES 2023; 9:eadg1261. [PMID: 37672580 PMCID: PMC10482333 DOI: 10.1126/sciadv.adg1261] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 07/27/2023] [Indexed: 09/08/2023]
Abstract
Complex disordered matter is of central importance to a wide range of disciplines, from bacterial colonies and embryonic tissues in biology to foams and granular media in materials science to stellar configurations in astrophysics. Because of the vast differences in composition and scale, comparing structural features across such disparate systems remains challenging. Here, by using the statistical properties of Delaunay tessellations, we introduce a mathematical framework for measuring topological distances between general three-dimensional point clouds. The resulting system-agnostic metric reveals subtle structural differences between bacterial biofilms as well as between zebrafish brain regions, and it recovers temporal ordering of embryonic development. We apply the metric to construct a universal topological atlas encompassing bacterial biofilms, snowflake yeast, plant shoots, zebrafish brain matter, organoids, and embryonic tissues as well as foams, colloidal packings, glassy materials, and stellar configurations. Living systems localize within a bounded island-like region of the atlas, reflecting that biological growth mechanisms result in characteristic topological properties.
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Affiliation(s)
- Dominic J Skinner
- Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- NSF-Simons Center for Quantitative Biology, Northwestern University, 2205 Tech Drive, Evanston, IL 60208, USA
| | - Hannah Jeckel
- Department of Physics, Philipps-Universität Marburg, Renthof 6, 35032 Marburg, Germany
- Biozentrum, University of Basel, Spitalstrasse 41, 4056 Basel, Switzerland
| | - Adam C Martin
- Department of Biology, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02139, USA
| | - Knut Drescher
- Biozentrum, University of Basel, Spitalstrasse 41, 4056 Basel, Switzerland
| | - Jörn Dunkel
- Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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4
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Almodóvar A, Galla T, López C. Liquid-hexatic-solid phases in active and passive Brownian particles determined by stochastic birth and death events. Phys Rev E 2022; 106:054130. [PMID: 36559396 DOI: 10.1103/physreve.106.054130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Accepted: 09/30/2022] [Indexed: 06/17/2023]
Abstract
We study the effects of stochastic birth and death processes on the structural phases of systems of active and passive Brownian particles subject to volume exclusion. The total number of particles in the system is a fluctuating quantity, determined by the birth and death parameters and on the activity of the particles. As the birth and death parameters are varied, we find liquid, hexatic, and solid phases. For passive particles, these phases are found to be spatially homogeneous. For active particles, motility-induced phase separation (coexisting hexatic and liquid phases) occurs for large activity and sufficiently small birth rates. We also observe a reentrant transition to the hexatic phase when the birth rate is increased. This results from a balance of an increasing number of particles filling the system, and a larger number of defects resulting from the birth and death dynamics.
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Affiliation(s)
- Alejandro Almodóvar
- IFISC, Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Tobias Galla
- IFISC, Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Cristóbal López
- IFISC, Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
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5
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Horn T, Narov KD, Panfilio KA. Persistent Parental RNAi in the Beetle Tribolium castaneum Involves Maternal Transmission of Long Double-Stranded RNA. ADVANCED GENETICS (HOBOKEN, N.J.) 2022; 3:2100064. [PMID: 36620196 PMCID: PMC9744488 DOI: 10.1002/ggn2.202100064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Indexed: 01/11/2023]
Abstract
Parental RNA interference (pRNAi) is a powerful and widely used method for gene-specific knockdown. Yet in insects its efficacy varies between species, and how the systemic response is transmitted from mother to offspring remains elusive. Using the beetle Tribolium castaneum, an RT-qPCR strategy to distinguish the presence of double-stranded RNA (dsRNA) from endogenous mRNA is reported. It is found that injected dsRNA is directly transmitted into the egg and persists throughout embryogenesis. Despite this depletion of dsRNA from the mother, it is shown that strong pRNAi can persist for months before waning at strain-specific rates. In seeking the receptor proteins for cellular uptake of long dsRNA into the egg, a phylogenomics profiling approach of candidate proteins is also presented. A visualization strategy based on taxonomically hierarchical assessment of orthology clustering data to rapidly assess gene age and copy number changes, refined by sequence-based evidence, is demonstrated. Repeated losses of SID-1-like channel proteins in the arthropods, including wholesale loss in the Heteroptera (true bugs), which are nonetheless highly sensitive to pRNAi, are thereby documented. Overall, practical considerations for insect pRNAi against a backdrop of outstanding questions on the molecular mechanism of dsRNA transmission for long-term, systemic knockdown are elucidated.
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Affiliation(s)
- Thorsten Horn
- Institute for Zoology: Developmental BiologyUniversity of CologneZülpicher Straße 47b50674CologneGermany
| | - Kalin D. Narov
- School of Life SciencesUniversity of WarwickGibbet Hill CampusCoventryCV4 7ALUK
| | - Kristen A. Panfilio
- Institute for Zoology: Developmental BiologyUniversity of CologneZülpicher Straße 47b50674CologneGermany
- School of Life SciencesUniversity of WarwickGibbet Hill CampusCoventryCV4 7ALUK
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6
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Leroy O, van Leen E, Girard P, Villedieu A, Hubert C, Bosveld F, Bellaïche Y, Renaud O. Multi-view confocal microscopy enables multiple organ and whole organism live-imaging. Development 2022; 149:274464. [DOI: 10.1242/dev.199760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Accepted: 01/13/2022] [Indexed: 11/20/2022]
Abstract
ABSTRACT
Understanding how development is coordinated in multiple tissues and gives rise to fully functional organs or whole organisms necessitates microscopy tools. Over the last decade numerous advances have been made in live-imaging, enabling high resolution imaging of whole organisms at cellular resolution. Yet, these advances mainly rely on mounting the specimen in agarose or aqueous solutions, precluding imaging of organisms whose oxygen uptake depends on ventilation. Here, we implemented a multi-view multi-scale microscopy strategy based on confocal spinning disk microscopy, called Multi-View confocal microScopy (MuViScopy). MuViScopy enables live-imaging of multiple organs with cellular resolution using sample rotation and confocal imaging without the need of sample embedding. We illustrate the capacity of MuViScopy by live-imaging Drosophila melanogaster pupal development throughout metamorphosis, highlighting how internal organs are formed and multiple organ development is coordinated. We foresee that MuViScopy will open the path to better understand developmental processes at the whole organism scale in living systems that require gas exchange by ventilation.
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Affiliation(s)
- Olivier Leroy
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
| | - Eric van Leen
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
| | - Philippe Girard
- Université de Paris, CNRS UMR7592, Institut Jacques Monod and Faculty of Basic and Biomedical Sciences, 75006, Paris, France
| | - Aurélien Villedieu
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
| | | | - Floris Bosveld
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
| | - Yohanns Bellaïche
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
| | - Olivier Renaud
- Institut Curie, Université PSL, Sorbonne Université, CNRS UMR3215, Inserm U934, Genetics and Developmental Biology, 75005 Paris, France
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7
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Skinner DJ, Song B, Jeckel H, Jelli E, Drescher K, Dunkel J. Topological Metric Detects Hidden Order in Disordered Media. PHYSICAL REVIEW LETTERS 2021; 126:048101. [PMID: 33576647 DOI: 10.1103/physrevlett.126.048101] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 10/15/2020] [Accepted: 11/18/2020] [Indexed: 06/12/2023]
Abstract
Recent advances in microscopy techniques make it possible to study the growth, dynamics, and response of complex biophysical systems at single-cell resolution, from bacterial communities to tissues and organoids. In contrast to ordered crystals, it is less obvious how one can reliably distinguish two amorphous yet structurally different cellular materials. Here, we introduce a topological earth mover's (TEM) distance between disordered structures that compares local graph neighborhoods of the microscopic cell-centroid networks. Leveraging structural information contained in the neighborhood motif distributions, the TEM metric allows an interpretable reconstruction of equilibrium and nonequilibrium phase spaces and embedded pathways from static system snapshots alone. Applied to cell-resolution imaging data, the framework recovers time ordering without prior knowledge about the underlying dynamics, revealing that fly wing development solves a topological optimal transport problem. Extending our topological analysis to bacterial swarms, we find a universal neighborhood size distribution consistent with a Tracy-Widom law.
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Affiliation(s)
- Dominic J Skinner
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
| | - Boya Song
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
| | - Hannah Jeckel
- Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany
- Department of Physics, Philipps-Universität Marburg, 35043 Marburg, Germany
| | - Eric Jelli
- Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany
- Department of Physics, Philipps-Universität Marburg, 35043 Marburg, Germany
| | - Knut Drescher
- Max Planck Institute for Terrestrial Microbiology, 35043 Marburg, Germany
- Department of Physics, Philipps-Universität Marburg, 35043 Marburg, Germany
| | - Jörn Dunkel
- Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307, USA
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8
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Jain A, Ulman V, Mukherjee A, Prakash M, Cuenca MB, Pimpale LG, Münster S, Haase R, Panfilio KA, Jug F, Grill SW, Tomancak P, Pavlopoulos A. Regionalized tissue fluidization is required for epithelial gap closure during insect gastrulation. Nat Commun 2020; 11:5604. [PMID: 33154375 PMCID: PMC7645651 DOI: 10.1038/s41467-020-19356-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2019] [Accepted: 10/05/2020] [Indexed: 12/15/2022] Open
Abstract
Many animal embryos pull and close an epithelial sheet around the ellipsoidal egg surface during a gastrulation process known as epiboly. The ovoidal geometry dictates that the epithelial sheet first expands and subsequently compacts. Moreover, the spreading epithelium is mechanically stressed and this stress needs to be released. Here we show that during extraembryonic tissue (serosa) epiboly in the insect Tribolium castaneum, the non-proliferative serosa becomes regionalized into a solid-like dorsal region with larger non-rearranging cells, and a more fluid-like ventral region surrounding the leading edge with smaller cells undergoing intercalations. Our results suggest that a heterogeneous actomyosin cable contributes to the fluidization of the leading edge by driving sequential eviction and intercalation of individual cells away from the serosa margin. Since this developmental solution utilized during epiboly resembles the mechanism of wound healing, we propose actomyosin cable-driven local tissue fluidization as a conserved morphogenetic module for closure of epithelial gaps. The mechanics of embryonic tissue spreading over spherical eggs is not fully understood. Here, the authors show that during gastrulation in the red flour beetle, extraembryonic tissue epiboly is facilitated by local actomyosin-mediated fluidization of the tissue at the leading edge.
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Affiliation(s)
- Akanksha Jain
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Technische Universität Dresden, Dresden, Germany
| | - Vladimir Ulman
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,IT4Innovations, Technical University of Ostrava, Ostrava, Czech Republic
| | | | - Mangal Prakash
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Center for Systems Biology, Dresden, Germany
| | - Marina B Cuenca
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany
| | - Lokesh G Pimpale
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Biotechnology Center, TU Dresden, Dresden, Germany
| | - Stefan Münster
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Max-Planck-Institute for the Physics of Complex Systems, Dresden, Germany.,Center for Systems Biology, Dresden, Germany.,Biotechnology Center, TU Dresden, Dresden, Germany
| | - Robert Haase
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Center for Systems Biology, Dresden, Germany
| | - Kristen A Panfilio
- Institute for Zoology: Developmental Biology, University of Cologne, Cologne, Germany.,School of Life Sciences, University of Warwick, Coventry, UK
| | - Florian Jug
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Center for Systems Biology, Dresden, Germany
| | - Stephan W Grill
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany.,Center for Systems Biology, Dresden, Germany.,Biotechnology Center, TU Dresden, Dresden, Germany.,Cluster of Excellence Physics of Life, TU Dresden, Dresden, Germany
| | - Pavel Tomancak
- Max-Planck-Institute of Molecular Cell Biology and Genetics, Dresden, Germany. .,IT4Innovations, Technical University of Ostrava, Ostrava, Czech Republic.
| | - Anastasios Pavlopoulos
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA. .,Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, Heraklion, Greece.
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9
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Benton MA, Frey N, Nunes da Fonseca R, von Levetzow C, Stappert D, Hakeemi MS, Conrads KH, Pechmann M, Panfilio KA, Lynch JA, Roth S. Fog signaling has diverse roles in epithelial morphogenesis in insects. eLife 2019; 8:47346. [PMID: 31573513 PMCID: PMC6794076 DOI: 10.7554/elife.47346] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 09/30/2019] [Indexed: 12/14/2022] Open
Abstract
The Drosophila Fog pathway represents one of the best-understood signaling cascades controlling epithelial morphogenesis. During gastrulation, Fog induces apical cell constrictions that drive the invagination of mesoderm and posterior gut primordia. The cellular mechanisms underlying primordia internalization vary greatly among insects and recent work has suggested that Fog signaling is specific to the fast mode of gastrulation found in some flies. On the contrary, here we show in the beetle Tribolium, whose development is broadly representative for insects, that Fog has multiple morphogenetic functions. It modulates mesoderm internalization and controls a massive posterior infolding involved in gut and extraembryonic development. In addition, Fog signaling affects blastoderm cellularization, primordial germ cell positioning, and cuboidal-to-squamous cell shape transitions in the extraembryonic serosa. Comparative analyses with two other distantly related insect species reveals that Fog's role during cellularization is widely conserved and therefore might represent the ancestral function of the pathway.
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Affiliation(s)
- Matthew Alan Benton
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany.,Department of Zoology, University of Cambridge, Cambridge, United Kingdom
| | - Nadine Frey
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | | | - Cornelia von Levetzow
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | - Dominik Stappert
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | - Muhammad Salim Hakeemi
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | - Kai H Conrads
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | - Matthias Pechmann
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
| | - Kristen A Panfilio
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany.,School of Life Sciences, University of Warwick, Coventry, United Kingdom
| | - Jeremy A Lynch
- Department of Biological Sciences, University of Illinois, Chicago, United States
| | - Siegfried Roth
- Institute for Zoology/Developmental Biology, Biocenter, University of Cologne, Köln, Germany
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10
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Münster S, Jain A, Mietke A, Pavlopoulos A, Grill SW, Tomancak P. Attachment of the blastoderm to the vitelline envelope affects gastrulation of insects. Nature 2019; 568:395-399. [DOI: 10.1038/s41586-019-1044-3] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 02/25/2019] [Indexed: 11/09/2022]
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11
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Yang X, Bi D, Czajkowski M, Merkel M, Manning ML, Marchetti MC. Correlating cell shape and cellular stress in motile confluent tissues. Proc Natl Acad Sci U S A 2017; 114:12663-12668. [PMID: 29138312 PMCID: PMC5715741 DOI: 10.1073/pnas.1705921114] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Collective cell migration is a highly regulated process involved in wound healing, cancer metastasis, and morphogenesis. Mechanical interactions among cells provide an important regulatory mechanism to coordinate such collective motion. Using a self-propelled Voronoi (SPV) model that links cell mechanics to cell shape and cell motility, we formulate a generalized mechanical inference method to obtain the spatiotemporal distribution of cellular stresses from measured traction forces in motile tissues and show that such traction-based stresses match those calculated from instantaneous cell shapes. We additionally use stress information to characterize the rheological properties of the tissue. We identify a motility-induced swim stress that adds to the interaction stress to determine the global contractility or extensibility of epithelia. We further show that the temporal correlation of the interaction shear stress determines an effective viscosity of the tissue that diverges at the liquid-solid transition, suggesting the possibility of extracting rheological information directly from traction data.
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Affiliation(s)
- Xingbo Yang
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138;
| | - Dapeng Bi
- Department of Physics, Northeastern University, Boston, MA 02115
| | | | | | - M Lisa Manning
- Physics Department, Syracuse University, Syracuse, NY 13244
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