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Katagade V, Kandroo M, Ratnaparkhi A. Embryonic spatiotemporal expression pattern of Folded gastrulation suggests roles in multiple morphogenetic events and regulation by AbdA. G3 (BETHESDA, MD.) 2024; 14:jkae032. [PMID: 38366558 DOI: 10.1093/g3journal/jkae032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 10/03/2023] [Accepted: 01/31/2024] [Indexed: 02/18/2024]
Abstract
In Drosophila, the signaling pathway activated by the ligand Folded gastrulation (Fog) is among the few known G protein-coupled receptor (GPCR) pathways to regulate cell shape change with a well-characterized role in gastrulation. However, an understanding of the spectrum of morphogenetic events regulated by Fog signaling is still lacking. Here, we present an analysis of the expression pattern and regulation of fog using a genome-engineered Fog::sfGFP line. We show that Fog expression is widespread and in tissues previously not associated with the signaling pathway including germ cells, trachea, and amnioserosa. In the central nervous system (CNS), we find that the ligand is expressed in multiple types of glia indicating a prominent role in the development of these cells. Consistent with this, we have identified 3 intronic enhancers whose expression in the CNS overlaps with Fog::sfGFP. Further, we show that enhancer-1, (fogintenh-1) located proximal to the coding exon is responsive to AbdA. Supporting this, we find that fog expression is downregulated in abdA mutants. Together, our study highlights the broad scope of Fog-GPCR signaling during embryogenesis and identifies Hox gene AbdA as a novel regulator of fog expression.
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Affiliation(s)
- Vrushali Katagade
- MACS-Agharkar Research Institute (Affiliated to Savitribai Phule Pune University), Developmental Biology Group, G.G. Agarkar Road, Pune 411 004, Maharashtra, India
| | - Manisha Kandroo
- MACS-Agharkar Research Institute (Affiliated to Savitribai Phule Pune University), Developmental Biology Group, G.G. Agarkar Road, Pune 411 004, Maharashtra, India
| | - Anuradha Ratnaparkhi
- MACS-Agharkar Research Institute (Affiliated to Savitribai Phule Pune University), Developmental Biology Group, G.G. Agarkar Road, Pune 411 004, Maharashtra, India
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2
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Bai J, Zeng X. Computational modeling and simulation of epithelial wound closure. Sci Rep 2023; 13:6265. [PMID: 37069231 PMCID: PMC10110613 DOI: 10.1038/s41598-023-33111-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Accepted: 04/07/2023] [Indexed: 04/19/2023] Open
Abstract
Wounds in the epithelium may lead to serious injurious events or chronic inflammatory diseases, however, multicellular organisms have the ability to self-repair wounds through the movement of epithelial cell toward the wound area. Despite intensive studies exploring the mechanism of wound closure, the role of mechanics in epithelial wound closure is still not well explained. In order to investigate the role of mechanical properties on wound closure process, a three-dimensional continuum physics-based computational model is presented in this study. The model takes into account the material property of the epithelial cell, intercellular interactions between neighboring cells at cell-cell junctions, and cell-substrate adhesion between epithelial cells and ECM. Through finite element simulation, it is found that the closure efficiency is related to the initial gap size and the intensity of lamellipodial protrusion. It is also shown that cells at the wound edge undergo higher stress compared with other cells in the epithelial monolayer, and the cellular normal stress dominates over the cellular shear stress. The model presented in this study can be employed as a numerical tool to unravel the mechanical principles behind the complex wound closure process. These results might have the potential to improve effective wound management and optimize the treatment.
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Affiliation(s)
- Jie Bai
- Department of Mechanical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA
| | - Xiaowei Zeng
- Department of Mechanical Engineering, University of Texas at San Antonio, One UTSA Circle, San Antonio, TX, 78249, USA.
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3
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Nandy N, Roy JK. Rab11 negatively regulates wingless preventing JNK-mediated apoptosis in Drosophila epithelium during embryonic dorsal closure. Cell Tissue Res 2023; 391:485-504. [PMID: 36705747 DOI: 10.1007/s00441-023-03740-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 01/12/2023] [Indexed: 01/28/2023]
Abstract
Rab11, a small Ras like GTPase marking the recycling endosomes, plays instrumental roles in Drosophila embryonic epithelial morphogenesis where an array of reports testify its importance in the maintenance of cyto-architectural as well as functional attributes of the concerned cells. Proper Rab11 functions ensure a precise regulation of developmentally active cell signaling pathways which in turn promote the expression of morphogens and other physico-chemical cues which finally forge an embryo out of a single layer of cells. Earlier reports have established that Rab11 functions are vital for fly embryonic development where amorphic mutants such as EP3017 homozygotes show a fair degree of epithelial defects along with incomplete dorsal closure. Here, we present a detailed account of the effects of Rab11 loss of function in the dorso-lateral epithelium which resulted in severe dorsal closure defects along with an elevated JNK-Dpp expression. We further observed that the dorso-lateral epithelial cells undergo epithelial to mesenchymal transition as well as apoptosis in Rab11 mutants with elevated expression levels of MMP1 and Caspase-3, where Caspase-3 contributes to the Rab11 knockout phenotype contrary to the knockdown mutants or hypomorphs. Interestingly, the elevated expressions of the core JNK-Dpp signaling could be rescued with a simultaneous knockdown of wingless in the Rab11 knockout mutants suggesting a genetic interaction of Rab11 with the Wingless pathway during dorsal closure, an ideal model of epithelial wound healing.
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Affiliation(s)
- Nabarun Nandy
- Cytogenetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi, 221005, India
| | - Jagat Kumar Roy
- Cytogenetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi, 221005, India.
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4
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Brunet T, Booth DS. Cell polarity in the protist-to-animal transition. Curr Top Dev Biol 2023; 154:1-36. [PMID: 37100515 DOI: 10.1016/bs.ctdb.2023.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023]
Abstract
A signature feature of the animal kingdom is the presence of epithelia: sheets of polarized cells that both insulate the organism from its environment and mediate interactions with it. Epithelial cells display a marked apico-basal polarity, which is highly conserved across the animal kingdom, both in terms of morphology and of molecular regulators. How did this architecture first evolve? Although the last eukaryotic common ancestor almost certainly possessed a simple form of apico-basal polarity (marked by the presence of one or several flagella at a single cellular pole), comparative genomics and evolutionary cell biology reveal that the polarity regulators of animal epithelial cells have a surprisingly complex and stepwise evolutionary history. Here, we retrace their evolutionary assembly. We suggest that the "polarity network" that polarized animal epithelial cells evolved by integration of initially independent cellular modules that evolved at distinct steps of our evolutionary ancestry. The first module dates back to the last common ancestor of animals and amoebozoans and involved Par1, extracellular matrix proteins, and the integrin-mediated adhesion complex. Other regulators, such as Cdc42, Dlg, Par6 and cadherins evolved in ancient unicellular opisthokonts, and might have first been involved in F-actin remodeling and filopodial dynamics. Finally, the bulk of "polarity proteins" as well as specialized adhesion complexes evolved in the metazoan stem-line, in concert with the newly evolved intercellular junctional belts. Thus, the polarized architecture of epithelia can be understood as a palimpsest of components of distinct histories and ancestral functions, which have become tightly integrated in animal tissues.
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5
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Treffkorn S, Mayer G, Janssen R. Review of extra-embryonic tissues in the closest arthropod relatives, onychophorans and tardigrades. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210270. [PMID: 36252224 PMCID: PMC9574629 DOI: 10.1098/rstb.2021.0270] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Accepted: 05/27/2022] [Indexed: 01/08/2023] Open
Abstract
The so-called extra-embryonic tissues are important for embryonic development in many animals, although they are not considered to be part of the germ band or the embryo proper. They can serve a variety of functions, such as nutrient uptake and waste removal, protection of the embryo against mechanical stress, immune response and morphogenesis. In insects, a subgroup of arthropods, extra-embryonic tissues have been studied extensively and there is increasing evidence that they might contribute more to embryonic development than previously thought. In this review, we provide an assessment of the occurrence and possible functions of extra-embryonic tissues in the closest arthropod relatives, onychophorans (velvet worms) and tardigrades (water bears). While there is no evidence for their existence in tardigrades, these tissues show a remarkable diversity across the onychophoran subgroups. A comparison of extra-embryonic tissues of onychophorans to those of arthropods suggests shared functions in embryonic nutrition and morphogenesis. Apparent contribution to the final form of the embryo in onychophorans and at least some arthropods supports the hypothesis that extra-embryonic tissues are involved in organogenesis. In order to account for this role, the commonly used definition of these tissues as 'extra-embryonic' should be reconsidered. This article is part of the theme issue 'Extraembryonic tissues: exploring concepts, definitions and functions across the animal kingdom'.
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Affiliation(s)
- Sandra Treffkorn
- Department of Zoology, Institute of Biology, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Georg Mayer
- Department of Zoology, Institute of Biology, University of Kassel, Heinrich-Plett-Str. 40, 34132 Kassel, Germany
| | - Ralf Janssen
- Department of Earth Sciences, Palaeobiology, Geocentrum, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden
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6
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Zhang YX, Liu CY, Chen HY, I L. Spontaneous multi-scale void formation and closure in densifying epithelial and fibroblast monolayers from the sub-confluent state. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2022; 45:89. [PMID: 36346482 DOI: 10.1140/epje/s10189-022-00242-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Accepted: 10/23/2022] [Indexed: 06/16/2023]
Abstract
Using time-lapse phase contrast microscopy, the formation and closure of spontaneously generated voids in the densifying monolayers of isotropic epithelial cells (ECs) and elongated fibroblast cells (FCs) through proliferation from the sub-confluent state are investigated. It is found that, in both types of monolayers after forming a connected network composed of nematic patches with different orientations, numerous multi-scale voids can be spontaneously formed and gradually close with increasing time. The isotropic fluctuations of deformation and crawling of ECs and the anisotropic axial motion/alignment polarizations of FCs are the two keys leading to the following different generic dynamical behaviors. In EC monolayers, voids exhibit irregular boundary fluctuations and easier cell re-orientation of front layer cells (FLCs) surrounding void boundaries. Void closures are mainly through pinching the gap between the opposite fluctuating void boundaries, and the inward crawling of FLCs to reduce void area associated with topological rearrangement to reduce FLC number. In FC monolayers, large voids have piecewise smooth convex boundaries, and cusp-shaped concave boundaries with cells orienting toward the void at cusp tips. The extension of a thin cell bridge from the cusp tip can bisect a large void into smaller voids. For smaller FC voids dominated by convex boundaries, along which cell alignment prohibits inward crawling, the reduction of FLC number through successive outward squeezing of single FLCs by neighboring FLCs sliding along the void boundary plays an important role for topological rearrangement and void closure. Unlike those surrounding artificial wounds in dense EC monolayers, the absence of ring-like purse-strings surrounding EC and FC voids allows topological rearrangements for reducing void perimeter and void area.
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Affiliation(s)
- Yun-Xuan Zhang
- Department of Physics and Center for Complex Systems, National Central University, Jhongli, 32001, Taiwan
| | - Chun-Yu Liu
- Department of Physics and Center for Complex Systems, National Central University, Jhongli, 32001, Taiwan
| | - Hsiang-Ying Chen
- Department of Physics and Center for Complex Systems, National Central University, Jhongli, 32001, Taiwan
| | - Lin I
- Department of Physics and Center for Complex Systems, National Central University, Jhongli, 32001, Taiwan.
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7
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Lv Z, Zhang N, Zhang X, Großhans J, Kong D. The Lateral Epidermis Actively Counteracts Pulling by the Amnioserosa During Dorsal Closure. Front Cell Dev Biol 2022; 10:865397. [PMID: 35652100 PMCID: PMC9148979 DOI: 10.3389/fcell.2022.865397] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 04/18/2022] [Indexed: 11/17/2022] Open
Abstract
Dorsal closure is a prominent morphogenetic process during Drosophila embryogenesis, which involves two epithelial tissues, that is, the squamous amnioserosa and the columnar lateral epidermis. Non-muscle myosin II-driven constriction in the amnioserosa leads to a decrease in the apical surface area and pulls on the adjacent lateral epidermis, which subsequently moves dorsally. The pull by the amnioserosa becomes obvious in an elongation of the epidermal cells, especially of those in the first row. The contribution of the epidermal cell elongation has remained unclear to dorsal closure. Cell elongation may be a mere passive consequence or an active response to the pulling by the amnioserosa. Here, we found that the lateral epidermis actively responds. We analyzed tensions within tissues and cell junctions by laser ablation before and during dorsal closure, the elliptical and dorsal closure stages, respectively. Furthermore, we genetically and optochemically induced chronic and acute cell contraction, respectively. In this way, we found that tension in the epidermis increased during dorsal closure. A correspondingly increased tension was not observed at individual junctions, however. Junctional tension even decreased during dorsal closure in the epidermis. We strikingly observed a strong increase of the microtubule amount in the epidermis, while non-muscle myosin II increased in both tissues. Our data suggest that the epidermis actively antagonizes the pull from the amnioserosa during dorsal closure and the increased microtubules might help the epidermis bear part of the mechanical force.
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Affiliation(s)
- Zhiyi Lv
- Institute of Evolution and Marine Biodiversity, Ocean University of China, Qingdao, China
| | - Na Zhang
- Department of Biology, Philipps University, Marburg, Germany
| | - Xiaozhu Zhang
- MOE Key Laboratory of Advanced Micro-Structured Materials and School of Physics Science and Engineering, Tongji University, Shanghai, China
- Frontiers Science Center for Intelligent Autonomous Systems, Tongji University, Shanghai, China
- Institute for Theoretical Physics and Center for Advancing Electronics Dresden (cfaed), Cluster of Excellence Physics of Life, TU Dresden, Dresden, Germany
| | - Jörg Großhans
- Department of Biology, Philipps University, Marburg, Germany
| | - Deqing Kong
- Department of Biology, Philipps University, Marburg, Germany
- *Correspondence: Deqing Kong,
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8
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Tóth K, Földi I, Mihály J. A Comparative Study of the Role of Formins in Drosophila Embryonic Dorsal Closure. Cells 2022; 11:cells11091539. [PMID: 35563844 PMCID: PMC9102720 DOI: 10.3390/cells11091539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/28/2022] [Accepted: 05/02/2022] [Indexed: 12/10/2022] Open
Abstract
Dorsal closure is a late embryogenesis process required to seal the epidermal hole on the dorsal side of the Drosophila embryo. This process involves the coordination of several forces generated in the epidermal cell layer and in the amnioserosa cells, covering the hole. Ultimately, these forces arise due to cytoskeletal rearrangements that induce changes in cell shape and result in tissue movement. While a number of cytoskeleton regulatory proteins have already been linked to dorsal closure, here we expand this list by demonstrating that four of the six Drosophila formin type actin assembly factors are needed to bring about the proper fusion of the epithelia. An analysis of the morphological and dynamic properties of dorsal closure in formin mutants revealed a differential contribution for each formin, although we found evidence for functional redundancies as well. Therefore, we propose that the four formins promote the formation of several, and only partly identical, actin structures each with a specific role in the mechanics of dorsal closure.
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Affiliation(s)
- Krisztina Tóth
- Biological Research Centre, Institute of Genetics, Temesvári krt. 62, H-6726 Szeged, Hungary; (K.T.); (I.F.)
- Doctoral School of Multidisciplinary Medical Science, Faculty of Medicine, University of Szeged, H-6725 Szeged, Hungary
| | - István Földi
- Biological Research Centre, Institute of Genetics, Temesvári krt. 62, H-6726 Szeged, Hungary; (K.T.); (I.F.)
| | - József Mihály
- Biological Research Centre, Institute of Genetics, Temesvári krt. 62, H-6726 Szeged, Hungary; (K.T.); (I.F.)
- Department of Genetics, University of Szeged, H-6726 Szeged, Hungary
- Correspondence:
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9
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The Tbx6 Transcription Factor Dorsocross Mediates Dpp Signaling to Regulate Drosophila Thorax Closure. Int J Mol Sci 2022; 23:ijms23094543. [PMID: 35562934 PMCID: PMC9104307 DOI: 10.3390/ijms23094543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/08/2022] [Accepted: 04/17/2022] [Indexed: 11/23/2022] Open
Abstract
Movement and fusion of separate cell populations are critical for several developmental processes, such as neural tube closure in vertebrates or embryonic dorsal closure and pupal thorax closure in Drosophila. Fusion failure results in an opening or groove on the body surface. Drosophila pupal thorax closure is an established model to investigate the mechanism of tissue closure. Here, we report the identification of T-box transcription factor genes Dorsocross (Doc) as Decapentaplegic (Dpp) targets in the leading edge cells of the notum in the late third instar larval and early pupal stages. Reduction of Doc in the notum region results in a thorax closure defect, similar to that in dpp loss-of-function flies. Nine genes are identified as potential downstream targets of Doc in regulating thorax closure by molecular and genetic screens. Our results reveal a novel function of Doc in Drosophila development. The candidate target genes provide new clues for unravelling the mechanism of collective cell movement.
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10
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Korkmazhan E, Kennard AS, Garzon-Coral C, Vasquez CG, Dunn AR. Tether-guided lamellipodia enable rapid wound healing. Biophys J 2022; 121:1029-1037. [PMID: 35167863 PMCID: PMC8943750 DOI: 10.1016/j.bpj.2022.02.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 12/15/2021] [Accepted: 02/03/2022] [Indexed: 11/20/2022] Open
Abstract
Adhesion between animal cells and the underlying extracellular matrix is challenged during wounding, cell division, and a variety of pathological processes. How cells recover adhesion in the immediate aftermath of detachment from the extracellular matrix remains incompletely understood, due in part to technical limitations. Here, we used acute chemical and mechanical perturbations to examine how epithelial cells respond to partial delamination events. In both cases, we found that cells extended lamellipodia to establish readhesion within seconds of detachment. These lamellipodia were guided by sparse membrane tethers whose tips remained attached to their original points of adhesion, yielding lamellipodia that appear to be qualitatively distinct from those observed during cell migration. In vivo measurements in the context of a zebrafish wound assay showed a similar behavior, in which membrane tethers guided rapidly extending lamellipodia. In the case of mechanical wounding events, cells selectively extended tether-guided lamellipodia in the direction opposite of the pulling force, resulting in the rapid reestablishment of contact with the substrate. We suggest that membrane tether-guided lamellipodial respreading may represent a general mechanism to reestablish tissue integrity in the face of acute disruption.
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Affiliation(s)
- Elgin Korkmazhan
- Graduate Program in Biophysics, Stanford University, Stanford, California; Department of Chemical Engineering, Stanford University, Stanford, California
| | - Andrew S Kennard
- Department of Biology and Howard Hughes Medical Institute, University of Washington, Seattle, Washington
| | - Carlos Garzon-Coral
- Department of Chemical Engineering, Stanford University, Stanford, California
| | - Claudia G Vasquez
- Department of Chemical Engineering, Stanford University, Stanford, California
| | - Alexander R Dunn
- Department of Chemical Engineering, Stanford University, Stanford, California.
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11
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Love A, Wagner GP. Co-option of stress mechanisms in the origin of evolutionary novelties. Evolution 2021; 76:394-413. [PMID: 34962651 PMCID: PMC9303342 DOI: 10.1111/evo.14421] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Revised: 10/19/2021] [Accepted: 10/24/2021] [Indexed: 11/30/2022]
Abstract
It is widely accepted that stressful conditions can facilitate evolutionary change. The mechanisms elucidated thus far accomplish this with a generic increase in heritable variation that facilitates more rapid adaptive evolution, often via plastic modifications of existing characters. Through scrutiny of different meanings of stress in biological research, and an explicit recognition that stressors must be characterized relative to their effect on capacities for maintaining functional integrity, we distinguish between: (1) previously identified stress‐responsive mechanisms that facilitate evolution by maintaining an adaptive fit with the environment, and (2) the co‐option of stress‐responsive mechanisms that are specific to stressors leading to the origin of novelties via compensation. Unlike standard accounts of gene co‐option that identify component sources of evolutionary change, our model documents the cost‐benefit trade‐offs and thereby explains how one mechanism—an immediate response to acute stress—is transformed evolutionarily into another—routine protection from recurring stressors. We illustrate our argument with examples from cell type origination as well as processes and structures at higher levels of organization. These examples suggest a general principle of evolutionary origination based on the capacity to switch between regulatory states related to reproduction and proliferation versus survival and differentiation.
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Affiliation(s)
- Alan Love
- Department of Philosophy, Minnesota Center for Philosophy of Science, University of Minnesota, Minneapolis, MN, USA
| | - Günter P Wagner
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT-06520.,Yale Systems Biology Institute, West Haven, CT-06516.,Department of Evolutionary Biology, University of Vienna, Austria
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12
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Trubuil E, D'Angelo A, Solon J. Tissue mechanics in morphogenesis: Active control of tissue material properties to shape living organisms. Cells Dev 2021; 168:203777. [DOI: 10.1016/j.cdev.2022.203777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 03/01/2022] [Accepted: 03/29/2022] [Indexed: 11/17/2022]
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13
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Kunar R, Roy JK. The mRNA decapping protein 2 (DCP2) is a major regulator of developmental events in Drosophila-insights from expression paradigms. Cell Tissue Res 2021; 386:261-280. [PMID: 34536141 DOI: 10.1007/s00441-021-03503-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Accepted: 07/01/2021] [Indexed: 02/07/2023]
Abstract
The Drosophila genome codes for two decapping proteins, DCP1 and DCP2, out of which DCP2 is the active decapping enzyme. The present endeavour explores the endogenous promoter firing, transcript and protein expression of DCP2 in Drosophila wherein, besides a ubiquitous expression across development, we identify an active expression paradigm during dorsal closure and a plausible moonlighting expression in the Corazonin neurons of the larval brain. We also demonstrate that the ablation of DCP2 leads to embryonic lethality and defects in vital morphogenetic processes whereas a knockdown of DCP2 in the Corazonin neurons reduces the sensitivity to ethanol in adults, thereby ascribing novel regulatory roles to DCP2. Our findings unravel novel putative roles for DCP2 and identify it as a candidate for studies on the regulated interplay of essential molecules during early development in Drosophila, nay the living world.
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Affiliation(s)
- Rohit Kunar
- Cytogenetics Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Uttar Pradesh, Varanasi, 221005, India
| | - Jagat Kumar Roy
- Cytogenetics Laboratory, Department of Zoology, Institute of Science, Banaras Hindu University, Uttar Pradesh, Varanasi, 221005, India.
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14
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Mechanics of neural tube morphogenesis. Semin Cell Dev Biol 2021; 130:56-69. [PMID: 34561169 DOI: 10.1016/j.semcdb.2021.09.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 09/07/2021] [Accepted: 09/10/2021] [Indexed: 01/07/2023]
Abstract
The neural tube is an important model system of morphogenesis representing the developmental module of out-of-plane epithelial deformation. As the embryonic precursor of the central nervous system, the neural tube also holds keys to many defects and diseases. Recent advances begin to reveal how genetic, cellular and environmental mechanisms work in concert to ensure correct neural tube shape. A physical model is emerging where these factors converge at the regulation of the mechanical forces and properties within and around the tissue that drive tube formation towards completion. Here we review the dynamics and mechanics of neural tube morphogenesis and discuss the underlying cellular behaviours from the viewpoint of tissue mechanics. We will also highlight some of the conceptual and technical next steps.
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15
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Das SL, Bose P, Lejeune E, Reich DH, Chen C, Eyckmans J. Extracellular Matrix Alignment Directs Provisional Matrix Assembly and Three Dimensional Fibrous Tissue Closure. Tissue Eng Part A 2021; 27:1447-1457. [PMID: 33979548 DOI: 10.1089/ten.tea.2020.0332] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Gap closure is a dynamic process in wound healing, in which a wound contracts and a provisional matrix is laid down, to restore structural integrity to injured tissues. The efficiency of wound closure has been found to depend on the shape of a wound, and this shape dependence has been echoed in various in vitro studies. While wound shape itself appears to contribute to this effect, it remains unclear whether the alignment of the surrounding extracellular matrix (ECM) may also contribute. In this study, we investigate the role both wound curvature and ECM alignment have on gap closure in a 3D culture model of fibrous tissue. Using microfabricated flexible micropillars positioned in rectangular and octagonal arrangements, seeded 3T3 fibroblasts embedded in a collagen matrix formed microtissues with different ECM alignments. Wounding these microtissues with a microsurgical knife resulted in wounds with different shapes and curvatures that closed at different rates. Observing different regions around the wounds, we noted local wound curvature did not impact the rate of production of provisional fibronectin matrix assembled by the fibroblasts. Instead, the rate of provisional matrix assembly was lowest emerging from regions of high fibronectin alignment and highest in the areas of low matrix alignment. Our data suggest that the underlying ECM structure affects the shape of the wound as well as the ability of fibroblasts to build provisional matrix, an important step in the process of tissue closure and restoration of tissue architecture. The study highlights an important interplay between ECM alignment, wound shape, and tissue healing that has not been previously recognized and may inform approaches to engineer tissues.
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Affiliation(s)
- Shoshana L Das
- Harvard-MIT Program in Health Sciences and Technology, Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Department of Biomedical Engineering, Boston University, Boston, Massachusetts, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts, USA
| | - Prasenjit Bose
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland, USA
| | - Emma Lejeune
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts, USA
| | - Daniel H Reich
- Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland, USA
| | - Christopher Chen
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts, USA
| | - Jeroen Eyckmans
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts, USA.,Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, Massachusetts, USA
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16
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Dobramysl U, Jarsch IK, Inoue Y, Shimo H, Richier B, Gadsby JR, Mason J, Szałapak A, Ioannou PS, Correia GP, Walrant A, Butler R, Hannezo E, Simons BD, Gallop JL. Stochastic combinations of actin regulatory proteins are sufficient to drive filopodia formation. J Cell Biol 2021; 220:e202003052. [PMID: 33740033 PMCID: PMC7980258 DOI: 10.1083/jcb.202003052] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 11/23/2020] [Accepted: 01/12/2021] [Indexed: 11/22/2022] Open
Abstract
Assemblies of actin and its regulators underlie the dynamic morphology of all eukaryotic cells. To understand how actin regulatory proteins work together to generate actin-rich structures such as filopodia, we analyzed the localization of diverse actin regulators within filopodia in Drosophila embryos and in a complementary in vitro system of filopodia-like structures (FLSs). We found that the composition of the regulatory protein complex where actin is incorporated (the filopodial tip complex) is remarkably heterogeneous both in vivo and in vitro. Our data reveal that different pairs of proteins correlate with each other and with actin bundle length, suggesting the presence of functional subcomplexes. This is consistent with a theoretical framework where three or more redundant subcomplexes join the tip complex stochastically, with any two being sufficient to drive filopodia formation. We provide an explanation for the observed heterogeneity and suggest that a mechanism based on multiple components allows stereotypical filopodial dynamics to arise from diverse upstream signaling pathways.
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Affiliation(s)
- Ulrich Dobramysl
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Iris Katharina Jarsch
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Yoshiko Inoue
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Hanae Shimo
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Benjamin Richier
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Jonathan R. Gadsby
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Julia Mason
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Alicja Szałapak
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Pantelis Savvas Ioannou
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | | | - Astrid Walrant
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
| | - Richard Butler
- Gurdon Institute, University of Cambridge, Cambridge, UK
| | - Edouard Hannezo
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Institute of Science and Technology Austria, Klosterneuburg, Austria
| | - Benjamin D. Simons
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, UK
| | - Jennifer L. Gallop
- Gurdon Institute, University of Cambridge, Cambridge, UK
- Department of Biochemistry, University of Cambridge, Cambridge, UK
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17
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King TR, Kramer J, Cheng YS, Swope D, Kramer SG. Enabled/VASP is required to mediate proper sealing of opposing cardioblasts during Drosophila dorsal vessel formation. Dev Dyn 2021; 250:1173-1190. [PMID: 33587326 DOI: 10.1002/dvdy.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 01/16/2021] [Accepted: 02/02/2021] [Indexed: 11/10/2022] Open
Abstract
INTRODUCTION The Drosophila dorsal vessel (DV) is comprised of two opposing rows of cardioblasts (CBs) that migrate toward the dorsal midline during development. While approaching the midline, CBs change shape, enabling dorsal and ventral attachments with their contralateral partners to create a linear tube with a central lumen. We previously demonstrated DV closure occurs via a "buttoning" mechanism where specific CBs advance ahead of their lateral neighbors, and attach creating transient holes, which eventually seal. RESULTS Here, we investigate the role of the actin-regulatory protein enabled (Ena) in DV closure. Loss of Ena results in DV cell shape and alignment defects. Live analysis of DV formation in ena mutants shows a reduction in CB leading edge protrusion length and gaps in the DV between contralateral CB pairs. These gaps occur primarily between a specific genetic subtype of CBs, which express the transcription factor seven-up (Svp) and form the ostia inflow tracts of the heart. In WT embryos these gaps between Svp+ CBs are observed transiently during the final stages of DV closure. CONCLUSIONS Our data suggest that Ena modulates the actin cytoskeleton in order to facilitate the complete sealing of the DV during the final stages of cardiac tube formation.
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Affiliation(s)
- Tiffany R King
- Graduate Program in Cell and Developmental Biology, Rutgers Graduate School of Biomedical Sciences at Robert Wood Johnson Medical School, Department of Pathology and Laboratory Medicine, Piscataway, New Jersey, USA.,Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Joseph Kramer
- Department of Pathology and Laboratory Medicine, Rutgers-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA
| | - Yi-Shan Cheng
- Department of Pathology and Laboratory Medicine, Rutgers-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA
| | - David Swope
- Department of Pathology and Laboratory Medicine, Rutgers-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA.,Department of Biomedical Sciences, Cooper Medical School of Rowan University, Camden, New Jersey, USA
| | - Sunita G Kramer
- Department of Pathology and Laboratory Medicine, Rutgers-Robert Wood Johnson Medical School, Piscataway, New Jersey, USA
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18
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Identifying Key Genetic Regions for Cell Sheet Morphogenesis on Chromosome 2L Using a Drosophila Deficiency Screen in Dorsal Closure. G3-GENES GENOMES GENETICS 2020; 10:4249-4269. [PMID: 32978263 PMCID: PMC7642946 DOI: 10.1534/g3.120.401386] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Cell sheet morphogenesis is essential for metazoan development and homeostasis of animal form - it contributes to developmental milestones including gastrulation, neural tube closure, heart and palate formation and to tissue maintenance during wound healing. Dorsal closure, a well-characterized stage in Drosophila embryogenesis and a model for cell sheet morphogenesis, is a remarkably robust process during which coordination of conserved gene expression patterns and signaling cascades regulate the cellular shape changes and movements. New 'dorsal closure genes' continue to be discovered due to advances in imaging and genetics. Here, we extend our previous study of the right arm of the 2nd chromosome to the left arm of the 2nd chromosome using the Bloomington deficiency kit's set of large deletions, which collectively remove 98.9% of the genes on the left arm of chromosome two (2L) to identify 'dorsal closure deficiencies'. We successfully screened 87.2% of the genes and identified diverse dorsal closure defects in embryos homozygous for 49 deficiencies, 27 of which delete no known dorsal closure gene. These homozygous deficiencies cause defects in cell shape, canthus formation and tissue dynamics. Within these deficiencies, we have identified pimples, odd-skipped, paired, and sloppy-paired 1 as dorsal closure genes on 2L that affect lateral epidermal cells. We will continue to identify novel 'dorsal closure genes' with further analysis. These forward genetic screens are expected to identify new processes and pathways that contribute to closure and links between pathways and structures already known to coordinate various aspects of closure.
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19
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Abstract
Cell and tissue shape changes are the fundamental elements of morphogenesis that drive normal development of embryos into fully functional organisms. This requires a variety of cellular processes including establishment and maintenance of polarity, tissue growth and apoptosis, and cell differentiation, rearrangement, and migration. It is widely appreciated that the cytoskeletal networks play an important role in regulating many of these processes and, in particular, that pulsed actomyosin contractions are a core cellular mechanism driving cell shape changes and cell rearrangement. In this review, we discuss the role of pulsed actomyosin contractions during developmental morphogenesis, advances in our understanding of the mechanisms regulating actomyosin pulsing, and novel techniques to probe the role of pulsed actomyosin processes in
in vivo model systems.
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Affiliation(s)
- Ann Sutherland
- Department of Cell Biology, University of Virginia Health System, Charlottesville, VA, USA
| | - Alyssa Lesko
- Department of Cell Biology, University of Virginia Health System, Charlottesville, VA, USA
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20
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The male stem cell niche of Drosophila melanogaster: Interactions between the germline stem cells and the hub. Exp Cell Res 2019; 383:111489. [DOI: 10.1016/j.yexcr.2019.07.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 06/27/2019] [Accepted: 07/02/2019] [Indexed: 11/21/2022]
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21
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Moon YS, Kim M, Hong CP, Kang JH, Jung JH. Overlapping and unique toxic effects of three alternative antifouling biocides (Diuron, Irgarol 1051 ®, Sea-Nine 211 ®) on non-target marine fish. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 180:23-32. [PMID: 31059904 DOI: 10.1016/j.ecoenv.2019.04.070] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 04/19/2019] [Accepted: 04/23/2019] [Indexed: 06/09/2023]
Abstract
The use of alternative biocides has increased due to their economic and ecological relevance. Although data regarding the toxicity of commercial alternative biocides in marine organisms are accumulating, little is known about their toxic pathways or mechanisms. To compare the toxic effects of commercial alternative biocides on non-target pelagic fish (flounder) embryos, we investigated the adverse effects of developmental malformation and transcriptional changes. Three biocides including Diuron, Irgarol 1051® and Sea-Nine 211® produced a largely overlapping suite of developmental malformations, including tail-fin fold defects and dorsal body axis curvature. In our test, the potencies of these biocides were ranked in the following order with respect to malformation and mortalities: Sea-Nine 211® > Irgarol 1051® > Diuron. Consistent with the toxicity rankings, the expression of genes related to heart formation was greater in embryonic flounder exposed to Sea-Nine 211® than in those exposed to Irgarol 1051® or Diuron, while expression of genes related to fin malformation was greater in the Irgarol 1051® exposure group. In analyses of differential gene expression (DEG) profiles (fold change of genes with a cutoff P < 0.05) by high-throughput sequencing (RNA-seq), genes associated with nervous system development, transmembrane transport activity, and muscle cell development were significantly changed commonly. Embryos exposed to Diuron showed changes related to cellular protein localization, whereas genes associated with immune system processes were up-regulated significantly in embryos exposed to Irgarol 1051®. Genes related to actin filament organization and embryonic morphogenesis were up-regulated in embryos exposed to Sea-Nine 211®. Overall, our study provides a better understanding of the overlapping and unique developmental toxic effects of three commercial booster biocides through transcriptomic analyses in a non-target species, embryonic flounder.
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Affiliation(s)
- Young-Sun Moon
- Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje, 53201, Republic of Korea
| | - Moonkoo Kim
- Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje, 53201, Republic of Korea; Department of Marine Environmental Science, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Chang Pyo Hong
- Theragen Etex Bio Institute Inc., 145 Gwanggyo-ro, Yeongtong-gu, Suwon-si, 16229, Gyeonggi-do, Republic of Korea
| | - Jung-Hoon Kang
- Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje, 53201, Republic of Korea; Department of Marine Environmental Science, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea
| | - Jee-Hyun Jung
- Risk Assessment Research Center, Korea Institute of Ocean Science and Technology, Geoje, 53201, Republic of Korea; Department of Marine Environmental Science, Korea University of Science and Technology, Daejeon, 34113, Republic of Korea.
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22
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Rutherford NE, Wong AH, Bruce AEE. Spatiotemporal characterization of dynamic epithelial filopodia during zebrafish epiboly. Dev Dyn 2019; 248:997-1008. [PMID: 31390119 DOI: 10.1002/dvdy.94] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Revised: 06/08/2019] [Accepted: 06/28/2019] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND During zebrafish epiboly, the embryonic cell mass, or blastoderm, spreads to enclose the yolk cell. The blastoderm consists of an outer epithelial sheet, the enveloping layer (EVL), and the underlying deep cell layer (DEL). Studies have provided insights into the mechanisms of EVL and deep cell epiboly, but little is known about the interactions between the two cell layers and what role they may play during epiboly. RESULTS We used live imaging to examine EVL basal protrusions. We identified them as filopodia based on f-actin content and localization of fluorescently tagged filopodial markers. A spatiotemporal analysis revealed that the largest number of EVL filopodia were present during early epiboly at the animal pole. In functional studies, expression of a constitutively active actin-bundling protein resulted in increased filopodial length and delayed gastrulation. CONCLUSIONS We identified protrusions on the basal surface of EVL cells as filopodia and showed that they are present throughout the EVL during epiboly. The largest number of filopodia was at the animal pole during early epiboly, which is when and where deep cell radial intercalations occur to the greatest extent. These findings suggest that EVL filopodia may function during epiboly to promote deep cell rearrangements during epiboly initiation.
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Affiliation(s)
- Nathan E Rutherford
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario
| | - Alexander H Wong
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario
| | - Ashley E E Bruce
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario
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23
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Sumi A, Hayes P, D'Angelo A, Colombelli J, Salbreux G, Dierkes K, Solon J. Adherens Junction Length during Tissue Contraction Is Controlled by the Mechanosensitive Activity of Actomyosin and Junctional Recycling. Dev Cell 2018; 47:453-463.e3. [PMID: 30458138 PMCID: PMC6291457 DOI: 10.1016/j.devcel.2018.10.025] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 09/25/2018] [Accepted: 10/22/2018] [Indexed: 12/26/2022]
Abstract
During epithelial contraction, cells generate forces to constrict their surface and, concurrently, fine-tune the length of their adherens junctions to ensure force transmission. While many studies have focused on understanding force generation, little is known on how junctional length is controlled. Here, we show that, during amnioserosa contraction in Drosophila dorsal closure, adherens junctions reduce their length in coordination with the shrinkage of apical cell area, maintaining a nearly constant junctional straightness. We reveal that junctional straightness and integrity depend on the endocytic machinery and on the mechanosensitive activity of the actomyosin cytoskeleton. On one hand, upon junctional stretch and decrease in E-cadherin density, actomyosin relocalizes from the medial area to the junctions, thus maintaining junctional integrity. On the other hand, when junctions have excess material and ruffles, junction removal is enhanced, and high junctional straightness and tension are restored. These two mechanisms control junctional length and integrity during morphogenesis.
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Affiliation(s)
- Angughali Sumi
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader, 88, Barcelona 08003, Spain
| | - Peran Hayes
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader, 88, Barcelona 08003, Spain
| | - Arturo D'Angelo
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader, 88, Barcelona 08003, Spain
| | - Julien Colombelli
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, Barcelona 08028, Spain
| | | | - Kai Dierkes
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader, 88, Barcelona 08003, Spain.
| | - Jérôme Solon
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Dr. Aiguader, 88, Barcelona 08003, Spain; Universitat Pompeu Fabra (UPF), Barcelona 08003, Spain.
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24
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Staddon MF, Bi D, Tabatabai AP, Ajeti V, Murrell MP, Banerjee S. Cooperation of dual modes of cell motility promotes epithelial stress relaxation to accelerate wound healing. PLoS Comput Biol 2018; 14:e1006502. [PMID: 30273354 PMCID: PMC6181425 DOI: 10.1371/journal.pcbi.1006502] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 10/11/2018] [Accepted: 09/11/2018] [Indexed: 11/19/2022] Open
Abstract
Collective cell migration in cohesive units is vital for tissue morphogenesis, wound repair, and immune response. While the fundamental driving forces for collective cell motion stem from contractile and protrusive activities of individual cells, it remains unknown how their balance is optimized to maintain tissue cohesiveness and the fluidity for motion. Here we present a cell-based computational model for collective cell migration during wound healing that incorporates mechanochemical coupling of cell motion and adhesion kinetics with stochastic transformation of active motility forces. We show that a balance of protrusive motility and actomyosin contractility is optimized for accelerating the rate of wound repair, which is robust to variations in cell and substrate mechanical properties. This balance underlies rapid collective cell motion during wound healing, resulting from a tradeoff between tension mediated collective cell guidance and active stress relaxation in the tissue.
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Affiliation(s)
- Michael F. Staddon
- Department of Physics and Astronomy, University College London, London, United Kingdom
- Institute for the Physics of Living Systems, University College London, London, United Kingdom
| | - Dapeng Bi
- Department of Physics, Northeastern University, Boston, Massachusetts, United States of America
| | - A. Pasha Tabatabai
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, United States of America
- Systems Biology Institute, Yale University, West Haven, Connecticut, United States of America
| | - Visar Ajeti
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, United States of America
- Systems Biology Institute, Yale University, West Haven, Connecticut, United States of America
| | - Michael P. Murrell
- Department of Biomedical Engineering, Yale University, New Haven, Connecticut, United States of America
- Systems Biology Institute, Yale University, West Haven, Connecticut, United States of America
- Department of Physics, Yale University, New Haven, Connecticut, United States of America
| | - Shiladitya Banerjee
- Department of Physics and Astronomy, University College London, London, United Kingdom
- Institute for the Physics of Living Systems, University College London, London, United Kingdom
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25
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Kiehart DP, Crawford JM, Aristotelous A, Venakides S, Edwards GS. Cell Sheet Morphogenesis: Dorsal Closure in Drosophila melanogaster as a Model System. Annu Rev Cell Dev Biol 2018; 33:169-202. [PMID: 28992442 DOI: 10.1146/annurev-cellbio-111315-125357] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Dorsal closure is a key process during Drosophila morphogenesis that models cell sheet movements in chordates, including neural tube closure, palate formation, and wound healing. Closure occurs midway through embryogenesis and entails circumferential elongation of lateral epidermal cell sheets that close a dorsal hole filled with amnioserosa cells. Signaling pathways regulate the function of cellular structures and processes, including Actomyosin and microtubule cytoskeletons, cell-cell/cell-matrix adhesion complexes, and endocytosis/vesicle trafficking. These orchestrate complex shape changes and movements that entail interactions between five distinct cell types. Genetic and laser perturbation studies establish that closure is robust, resilient, and the consequence of redundancy that contributes to four distinct biophysical processes: contraction of the amnioserosa, contraction of supracellular Actomyosin cables, elongation (stretching?) of the lateral epidermis, and zipping together of two converging cell sheets. What triggers closure and what the emergent properties are that give rise to its extraordinary resilience and fidelity remain key, extant questions.
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Affiliation(s)
- Daniel P Kiehart
- Department of Biology, Duke University, Durham, North Carolina 27708;
| | - Janice M Crawford
- Department of Biology, Duke University, Durham, North Carolina 27708;
| | - Andreas Aristotelous
- Department of Mathematics, West Chester University, West Chester, Pennsylvania 19383
| | | | - Glenn S Edwards
- Physics Department, Duke University, Durham, North Carolina 27708
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26
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Del Bel LM, Brill JA. Sac1, a lipid phosphatase at the interface of vesicular and nonvesicular transport. Traffic 2018; 19:301-318. [PMID: 29411923 DOI: 10.1111/tra.12554] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 02/02/2018] [Accepted: 02/02/2018] [Indexed: 12/14/2022]
Abstract
The lipid phosphatase Sac1 dephosphorylates phosphatidylinositol 4-phosphate (PI4P), thereby holding levels of this crucial membrane signaling molecule in check. Sac1 regulates multiple cellular processes, including cytoskeletal organization, membrane trafficking and cell signaling. Here, we review the structure and regulation of Sac1, its roles in cell signaling and development and its links to health and disease. Remarkably, many of the diverse roles attributed to Sac1 can be explained by the recent discovery of its requirement at membrane contact sites, where its consumption of PI4P is proposed to drive interorganelle transfer of other cellular lipids, thereby promoting normal lipid homeostasis within cells.
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Affiliation(s)
- Lauren M Del Bel
- Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Julie A Brill
- Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario, Canada.,Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
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27
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Fraire-Zamora JJ, Jaeger J, Solon J. Two consecutive microtubule-based epithelial seaming events mediate dorsal closure in the scuttle fly Megaselia abdita. eLife 2018. [PMID: 29537962 PMCID: PMC5851697 DOI: 10.7554/elife.33807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Evolution of morphogenesis is generally associated with changes in genetic regulation. Here, we report evidence indicating that dorsal closure, a conserved morphogenetic process in dipterans, evolved as the consequence of rearrangements in epithelial organization rather than signaling regulation. In Drosophila melanogaster, dorsal closure consists of a two-tissue system where the contraction of extraembryonic amnioserosa and a JNK/Dpp-dependent epidermal actomyosin cable result in microtubule-dependent seaming of the epidermis. We find that dorsal closure in Megaselia abdita, a three-tissue system comprising serosa, amnion and epidermis, differs in morphogenetic rearrangements despite conservation of JNK/Dpp signaling. In addition to an actomyosin cable, M. abdita dorsal closure is driven by the rupture and contraction of the serosa and the consecutive microtubule-dependent seaming of amnion and epidermis. Our study indicates that the evolutionary transition to a reduced system of dorsal closure involves simplification of the seaming process without changing the signaling pathways of closure progression.
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Affiliation(s)
- Juan Jose Fraire-Zamora
- Cell and Developmental Biology Programme, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra, Barcelona, Spain
| | - Johannes Jaeger
- Universitat Pompeu Fabra, Barcelona, Spain.,System Biology Programme, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Konrad Lorenz Institute for Evolution and Cognition Research (KLI), Klosterneuburg, Austria
| | - Jérôme Solon
- Cell and Developmental Biology Programme, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra, Barcelona, Spain
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28
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Pais M, Archer MS. Histological age estimation of the eggs of Calliphora vicina Robineau Desvoidy (Diptera: Calliphoridae). Forensic Sci Res 2017; 3:40-51. [PMID: 30483650 PMCID: PMC6197141 DOI: 10.1080/20961790.2017.1404707] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 11/10/2017] [Indexed: 01/07/2023] Open
Abstract
Aging blow fly eggs can be critical to a forensic investigation, but there are currently no forensically useful timelines describing internal anatomical changes in embryological development. This is partly due to the lack of an economical, rapid and technically simple histological technique to allow mass production of slides for research and casework. We present a histological method that uses a slightly modified standard laboratory processing run with 1 h fixation in 10% formalin, 2 h softening in Molliflex and Haemotoxylin and Eosin (H&E) staining. We also present a summary of the internal anatomical changes that can be visualized using our technique in the developing eggs of Calliphora vicina Robineau-Desvoidy (Diptera: Calliphoridae). We examined eggs from at least three different females grown at 15 °C and sampled at 6 h intervals, and eggs grown at 20 °C and sampled at 3 h intervals. Blind aging trials demonstrated that it is possible to accurately age material grown at 20 °C to within 6 h (but attempts to further narrow this interval resulted in errors in one-third of cases). It was also possible to see sufficient anatomical detail to age eggs preserved for forensic casework 5, 8, 9, 10 and 11 years previously. Additionally, we determined that section quality was improved by 5 s fixation in hot water prior to preservation in ethanol. However, hot water fixation for longer than this increased the level of section artefact.
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Affiliation(s)
- Michael Pais
- Department of Forensic Medicine, Victorian Institute of Forensic Medicine, Monash University, Southbank, Victoria, Australia
| | - Melanie S Archer
- Department of Forensic Medicine, Victorian Institute of Forensic Medicine, Monash University, Southbank, Victoria, Australia
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29
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Kushnir T, Mezuman S, Bar-Cohen S, Lange R, Paroush Z, Helman A. Novel interplay between JNK and Egfr signaling in Drosophila dorsal closure. PLoS Genet 2017. [PMID: 28628612 PMCID: PMC5495517 DOI: 10.1371/journal.pgen.1006860] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Dorsal closure (DC) is a developmental process in which two contralateral epithelial sheets migrate to seal a large hole in the dorsal ectoderm of the Drosophila embryo. Two signaling pathways act sequentially to orchestrate this dynamic morphogenetic process. First, c-Jun N-terminal kinase (JNK) signaling activity in the dorsal-most leading edge (LE) cells of the epidermis induces expression of decapentaplegic (dpp). Second, Dpp, a secreted TGF-β homolog, triggers cell shape changes in the adjacent, ventrally located lateral epidermis, that guide the morphogenetic movements and cell migration mandatory for DC. Here we uncover a cell non-autonomous requirement for the Epidermal growth factor receptor (Egfr) pathway in the lateral epidermis for sustained dpp expression in the LE. Specifically, we demonstrate that Egfr pathway activity in the lateral epidermis prevents expression of the gene scarface (scaf), encoding a secreted antagonist of JNK signaling. In embryos with compromised Egfr signaling, upregulated Scaf causes reduction of JNK activity in LE cells, thereby impeding completion of DC. Our results identify a new developmental role for Egfr signaling in regulating epithelial plasticity via crosstalk with the JNK pathway.
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Affiliation(s)
- Tatyana Kushnir
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
| | - Sharon Mezuman
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
| | - Shaked Bar-Cohen
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
| | - Rotem Lange
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
| | - Ze'ev Paroush
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
- * E-mail:
| | - Aharon Helman
- Department of Developmental Biology and Cancer Research, IMRIC, Faculty of Medicine, The Hebrew University, Jerusalem, Israel
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30
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Treffkorn S, Mayer G. Conserved versus derived patterns of controlled cell death during the embryonic development of two species of Onychophora (velvet worms). Dev Dyn 2017; 246:403-416. [PMID: 28198063 DOI: 10.1002/dvdy.24492] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 02/07/2017] [Accepted: 02/07/2017] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Apoptosis is involved in various developmental processes, including cell migration and tissue and organ formation. Some of these processes are conserved across metazoans, while others are specific to particular taxa. Although the patterns of apoptosis have been investigated in arthropods, no corresponding data are available from one of their closest relatives, the Onychophora (velvet worms). RESULTS We analyzed the patterns of apoptosis in embryos of two onychophoran species: the lecithotrophic/matrotrophic viviparous peripatopsid Euperipatoides rowelli, and the placentotrophic viviparous peripatid Principapillatus hitoyensis. Our data show that apoptosis occurs early in development and might be responsible for the degeneration of extra-embryonic tissues. Moreover, apoptosis might be involved in the morphogenesis of the ventral and preventral organs in both species and occurs additionally in the placental stalk of P. hitoyensis. CONCLUSIONS Despite the different developmental modes in these onychophoran species, our data suggest that patterns of apoptosis are conserved among onychophorans. While apoptosis in the dorsal extra-embryonic tissue might contribute to dorsal closure-a process also known from arthropods-the involvement of apoptosis in ventral closure might be unique to onychophorans. Apoptosis in the placental stalk of P. hitoyensis is most likely a derived feature of the placentotrophic onychophorans. Developmental Dynamics 246:403-416, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Sandra Treffkorn
- Department of Zoology, Institute of Biology, University of Kassel, Kassel, Germany
| | - Georg Mayer
- Department of Zoology, Institute of Biology, University of Kassel, Kassel, Germany
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31
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Takács Z, Jankovics F, Vilmos P, Lénárt P, Röper K, Erdélyi M. The spectraplakin Short stop is an essential microtubule regulator involved in epithelial closure in Drosophila. J Cell Sci 2017; 130:712-724. [PMID: 28062848 PMCID: PMC5339884 DOI: 10.1242/jcs.193003] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 12/21/2016] [Indexed: 02/04/2023] Open
Abstract
Dorsal closure of the Drosophila embryonic epithelium provides an excellent model system for the in vivo analysis of molecular mechanisms regulating cytoskeletal rearrangements. In this study, we investigated the function of the Drosophila spectraplakin Short stop (Shot), a conserved cytoskeletal structural protein, during closure of the dorsal embryonic epithelium. We show that Shot is essential for the efficient final zippering of the opposing epithelial margins. By using isoform-specific mutant alleles and genetic rescue experiments with truncated Shot variants, we demonstrate that Shot functions as an actin-microtubule cross-linker in mediating zippering. At the leading edge of epithelial cells, Shot regulates protrusion dynamics by promoting filopodia formation. Fluorescence recovery after photobleaching (FRAP) analysis and in vivo imaging of microtubule growth revealed that Shot stabilizes dynamic microtubules. The actin- and microtubule-binding activities of Shot are simultaneously required in the same molecule, indicating that Shot is engaged as a physical crosslinker in this process. We propose that Shot-mediated interactions between microtubules and actin filaments facilitate filopodia formation, which promotes zippering by initiating contact between opposing epithelial cells.
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Affiliation(s)
- Zsanett Takács
- Institute of Genetics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62, Szeged 6726, Hungary
| | - Ferenc Jankovics
- Institute of Genetics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62, Szeged 6726, Hungary
| | - Péter Vilmos
- Institute of Genetics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62, Szeged 6726, Hungary
| | - Péter Lénárt
- Cell Biology and Biophysics Unit, European Molecular Biology Laboratory (EMBL), Meyerhofstrasse 1, Heidelberg 69117, Germany
| | - Katja Röper
- MRC-Laboratory of Molecular Biology, Cambridge Biomedical Campus, Francis Crick Avenue, Cambridge CB2 0QH, UK
| | - Miklós Erdélyi
- Institute of Genetics, Biological Research Centre of the Hungarian Academy of Sciences, Temesvári krt. 62, Szeged 6726, Hungary
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32
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Lu H, Sokolow A, Kiehart DP, Edwards GS. Quantifying dorsal closure in three dimensions. Mol Biol Cell 2016; 27:3948-3955. [PMID: 27798232 PMCID: PMC5156535 DOI: 10.1091/mbc.e16-06-0400] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 09/12/2016] [Accepted: 10/18/2016] [Indexed: 01/31/2023] Open
Abstract
Dorsal closure is an essential stage of Drosophila embryogenesis and is a powerful model system for morphogenesis, wound healing, and tissue biomechanics. During closure, two flanks of lateral epidermis close an eye-shaped dorsal opening that is filled with amnioserosa. The two flanks of lateral epidermis are zipped together at each canthus ("corner" of the eye). Actomyosin-rich purse strings are localized at each of the two leading edges of lateral epidermis ("lids" of the eye). Here we report that each purse string indents the dorsal surface at each leading edge. The amnioserosa tissue bulges outward during the early-to-mid stages of closure to form a remarkably smooth, asymmetric dome indicative of an isotropic and uniform surface tension. Internal pressure of the embryo and tissue elastic properties help to shape the dorsal surface.
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Affiliation(s)
- Heng Lu
- Physics Department, Duke University, Durham, NC 27708
| | - Adam Sokolow
- Physics Department, Duke University, Durham, NC 27708
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33
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Jurado J, de Navascués J, Gorfinkiel N. α-Catenin stabilises Cadherin-Catenin complexes and modulates actomyosin dynamics to allow pulsatile apical contraction. J Cell Sci 2016; 129:4496-4508. [PMID: 27831494 DOI: 10.1242/jcs.193268] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 11/02/2016] [Indexed: 01/07/2023] Open
Abstract
We have investigated how cell contractility and adhesion are functionally integrated during epithelial morphogenesis. To this end, we have analysed the role of α-Catenin, a key molecule linking E-Cadherin-based adhesion and the actomyosin cytoskeleton, during Drosophila embryonic dorsal closure, by studying a newly developed allelic series. We find that α-Catenin regulates pulsatile apical contraction in the amnioserosa, the main force-generating tissue driving closure of the embryonic epidermis. α-Catenin controls actomyosin dynamics by stabilising and promoting the formation of actomyosin foci, and also stabilises DE-Cadherin (Drosophila E-Cadherin, also known as Shotgun) at the cell membrane, suggesting that medioapical actomyosin contractility regulates junction stability. Furthermore, we uncover a genetic interaction between α-Catenin and Vinculin, and a tension-dependent recruitment of Vinculin to amniosersoa apical cell membranes, suggesting the existence of a mechano-sensitive module operating in this tissue.
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Affiliation(s)
- Jaime Jurado
- Centro de Biología Molecular "Severo Ochoa", CSIC-UAM, Cantoblanco, Madrid 28049, Spain
| | - Joaquín de Navascués
- European Cancer Stem Cell Research Institute, School of Biosciences, Cardiff University, Cardiff CF24 4HQ, UK
| | - Nicole Gorfinkiel
- Centro de Biología Molecular "Severo Ochoa", CSIC-UAM, Cantoblanco, Madrid 28049, Spain
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34
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Lu H, Sokolow A, Kiehart DP, Edwards GS. Remodeling Tissue Interfaces and the Thermodynamics of Zipping during Dorsal Closure in Drosophila. Biophys J 2016; 109:2406-17. [PMID: 26636951 DOI: 10.1016/j.bpj.2015.10.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Revised: 09/16/2015] [Accepted: 10/07/2015] [Indexed: 10/22/2022] Open
Abstract
Dorsal closure during Drosophila embryogenesis is an important model system for investigating the biomechanics of morphogenesis. During closure, two flanks of lateral epidermis (with actomyosin-rich purse strings near each leading edge) close an eye-shaped opening that is filled with amnioserosa. At each canthus (corner of the eye) a zipping process remodels the tissue interfaces between the leading edges of the lateral epidermis and the amnioserosa. We investigated zipping dynamics and found that apposing leading edge cells come together at their apical ends and then square off basally to form a lateral junction. Meanwhile, the purse strings act as contractile elastic rods bent toward the embryo interior near each canthus. We propose that a canthus-localized force contributes to both bending the ends of the purse strings and the formation of lateral junctions. We developed a thermodynamic model for zipping based on three-dimensional remodeling of the tissue interfaces and the reaction dynamics of adhesion molecules in junctions and elsewhere, which we applied to zipping during unperturbed wild-type closure and to laser or genetically perturbed closure. We identified two processes that can contribute to the zipping mechanism, consistent with experiments, distinguished by whether amnioserosa dynamics do or do not augment canthus adhesion dynamics.
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Affiliation(s)
- Heng Lu
- Physics Department, Duke University, Durham, North Carolina
| | - Adam Sokolow
- Physics Department, Duke University, Durham, North Carolina
| | | | - Glenn S Edwards
- Physics Department, Duke University, Durham, North Carolina.
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35
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Ferguson JP, Willy NM, Heidotting SP, Huber SD, Webber MJ, Kural C. Deciphering dynamics of clathrin-mediated endocytosis in a living organism. J Cell Biol 2016; 214:347-58. [PMID: 27458134 PMCID: PMC4970330 DOI: 10.1083/jcb.201604128] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/05/2016] [Indexed: 11/22/2022] Open
Abstract
Current understanding of clathrin-mediated endocytosis (CME) dynamics is based on detection and tracking of fluorescently tagged clathrin coat components within cultured cells. Because of technical limitations inherent to detection and tracking of single fluorescent particles, CME dynamics is not characterized in vivo, so the effects of mechanical cues generated during development of multicellular organisms on formation and dissolution of clathrin-coated structures (CCSs) have not been directly observed. Here, we use growth rates of fluorescence signals obtained from short CCS intensity trace fragments to assess CME dynamics. This methodology does not rely on determining the complete lifespan of individual endocytic assemblies. Therefore, it allows for real-time monitoring of spatiotemporal changes in CME dynamics and is less prone to errors associated with particle detection and tracking. We validate the applicability of this approach to in vivo systems by demonstrating the reduction of CME dynamics during dorsal closure of Drosophila melanogaster embryos.
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Affiliation(s)
- Joshua P Ferguson
- Department of Physics, The Ohio State University, Columbus, OH 43210
| | - Nathan M Willy
- Department of Physics, The Ohio State University, Columbus, OH 43210
| | | | - Scott D Huber
- Department of Physics, The Ohio State University, Columbus, OH 43210
| | - Matthew J Webber
- Biophysics Graduate Program, The Ohio State University, Columbus, OH 43210
| | - Comert Kural
- Department of Physics, The Ohio State University, Columbus, OH 43210 Biophysics Graduate Program, The Ohio State University, Columbus, OH 43210
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36
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Schwayer C, Sikora M, Slováková J, Kardos R, Heisenberg CP. Actin Rings of Power. Dev Cell 2016; 37:493-506. [DOI: 10.1016/j.devcel.2016.05.024] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/24/2016] [Accepted: 05/25/2016] [Indexed: 12/21/2022]
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37
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Cellular forces and matrix assembly coordinate fibrous tissue repair. Nat Commun 2016; 7:11036. [PMID: 26980715 PMCID: PMC4799373 DOI: 10.1038/ncomms11036] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 02/12/2016] [Indexed: 01/17/2023] Open
Abstract
Planar in vitro models have been invaluable tools to identify the mechanical basis of wound closure. Although these models may recapitulate closure dynamics of epithelial cell sheets, they fail to capture how a wounded fibrous tissue rebuilds its 3D architecture. Here we develop a 3D biomimetic model for soft tissue repair and demonstrate that fibroblasts ensconced in a collagen matrix rapidly close microsurgically induced defects within 24 h. Traction force microscopy and time-lapse imaging reveal that closure of gaps begins with contractility-mediated whole-tissue deformations. Subsequently, tangentially migrating fibroblasts along the wound edge tow and assemble a progressively thickening fibronectin template inside the gap that provide the substrate for cells to complete closure. Unlike previously reported mechanisms based on lamellipodial protrusions and purse-string contraction, our data reveal a mode of stromal closure in which coordination of tissue-scale deformations, matrix assembly and cell migration act together to restore 3D tissue architecture. Planar in vitro models for wound closure stress the role of lamellipodial protrusions and purse-string contraction. Here the authors develop a 3D biomimetic model for tissue repair and show a mode of stromal closure that relies on whole tissue deformations, cell migration and matrix deposition.
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38
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Lacy ME, Hutson MS. Amnioserosa development and function in Drosophila embryogenesis: Critical mechanical roles for an extraembryonic tissue. Dev Dyn 2016; 245:558-68. [PMID: 26878336 DOI: 10.1002/dvdy.24395] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 02/08/2016] [Accepted: 02/09/2016] [Indexed: 11/07/2022] Open
Abstract
Despite being a short-lived, extraembryonic tissue, the amnioserosa plays critical roles in the major morphogenetic events of Drosophila embryogenesis. These roles involve both cellular mechanics and biochemical signaling. Its best-known role is in dorsal closure-well studied by both developmental biologists and biophysicists-but the amnioserosa is also important during earlier developmental stages. Here, we provide an overview of amnioserosa specification and its role in several key developmental stages: germ band extension, germ band retraction, and dorsal closure. We also compare embryonic development in Drosophila and its relative Megaselia to highlight how the amnioserosa and its roles have evolved. Placed in context, the amnioserosa provides a fascinating example of how signaling, mechanics, and morphogen patterns govern cell-type specification and subsequent morphogenetic changes in cell shape, orientation, and movement. Developmental Dynamics 245:558-568, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Monica E Lacy
- Department of Physics & Astronomy, Vanderbilt University, Nashville, Tennessee
| | - M Shane Hutson
- Department of Physics & Astronomy, Vanderbilt University, Nashville, Tennessee.,Vanderbilt Institute for Integrative Biosystems Research & Education, Vanderbilt University, Nashville, Tennessee
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39
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Wernike D, Chen Y, Mastronardi K, Makil N, Piekny A. Mechanical forces drive neuroblast morphogenesis and are required for epidermal closure. Dev Biol 2016; 412:261-77. [PMID: 26923492 DOI: 10.1016/j.ydbio.2016.02.023] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 02/24/2016] [Accepted: 02/24/2016] [Indexed: 10/22/2022]
Abstract
Tissue morphogenesis requires myosin-dependent events such as cell shape changes and migration to be coordinated between cells within a tissue, and/or with cells from other tissues. However, few studies have investigated the simultaneous morphogenesis of multiple tissues in vivo. We found that during Caenorhabditis elegans ventral enclosure, when epidermal cells collectively migrate to cover the ventral surface of the embryo, the underlying neuroblasts (neuronal precursor cells) also undergo morphogenesis. We found that myosin accumulates as foci along the junction-free edges of the ventral epidermal cells to form a ring, whose closure is myosin-dependent. We also observed the accumulation of myosin foci and the adhesion junction proteins E-cadherin and α-catenin in the underlying neuroblasts. Myosin may help to reorganize a subset of neuroblasts into a rosette-like pattern, and decrease their surface area as the overlying epidermal cells constrict. Since myosin is required in the neuroblasts for ventral enclosure, we propose that mechanical forces in the neuroblasts influence constriction of the overlying epidermal cells. In support of this model, disrupting neuroblast cell division or altering their fate influences myosin localization in the overlying epidermal cells. The coordination of myosin-dependent events and forces between cells in different tissues could be a common theme for coordinating morphogenetic events during metazoan development.
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Affiliation(s)
- Denise Wernike
- Department of Biology, Concordia University, Montreal, Quebec, Canada
| | - Yun Chen
- Department of Biology, Concordia University, Montreal, Quebec, Canada
| | | | - Neetha Makil
- Department of Biology, Concordia University, Montreal, Quebec, Canada
| | - Alisa Piekny
- Department of Biology, Concordia University, Montreal, Quebec, Canada.
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40
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Quétier I, Marshall JJT, Spencer-Dene B, Lachmann S, Casamassima A, Franco C, Escuin S, Worrall JT, Baskaran P, Rajeeve V, Howell M, Copp AJ, Stamp G, Rosewell I, Cutillas P, Gerhardt H, Parker PJ, Cameron AJM. Knockout of the PKN Family of Rho Effector Kinases Reveals a Non-redundant Role for PKN2 in Developmental Mesoderm Expansion. Cell Rep 2016; 14:440-448. [PMID: 26774483 PMCID: PMC4733087 DOI: 10.1016/j.celrep.2015.12.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 11/06/2015] [Accepted: 12/07/2015] [Indexed: 11/29/2022] Open
Abstract
In animals, the protein kinase C (PKC) family has expanded into diversely regulated subgroups, including the Rho family-responsive PKN kinases. Here, we describe knockouts of all three mouse PKN isoforms and reveal that PKN2 loss results in lethality at embryonic day 10 (E10), with associated cardiovascular and morphogenetic defects. The cardiovascular phenotype was not recapitulated by conditional deletion of PKN2 in endothelial cells or the developing heart. In contrast, inducible systemic deletion of PKN2 after E7 provoked collapse of the embryonic mesoderm. Furthermore, mouse embryonic fibroblasts, which arise from the embryonic mesoderm, depend on PKN2 for proliferation and motility. These cellular defects are reflected in vivo as dependence on PKN2 for mesoderm proliferation and neural crest migration. We conclude that failure of the mesoderm to expand in the absence of PKN2 compromises cardiovascular integrity and development, resulting in lethality.
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Affiliation(s)
- Ivan Quétier
- Kinase Biology Laboratory, John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Jacqueline J T Marshall
- Protein Phosphorylation Laboratory, Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | | | - Sylvie Lachmann
- Protein Phosphorylation Laboratory, Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Adele Casamassima
- Protein Phosphorylation Laboratory, Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Claudio Franco
- Instituto Medicina Molecular (iMM), Faculdade de Medicina da Universidade de Lisboa, 1649-028 Lisbon, Portugal
| | - Sarah Escuin
- Newlife Birth Defects Research Centre, Institute of Child Health, University College, London WC1N 1EH, UK
| | - Joseph T Worrall
- John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Priththivika Baskaran
- Kinase Biology Laboratory, John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Vinothini Rajeeve
- John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Michael Howell
- Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Andrew J Copp
- Newlife Birth Defects Research Centre, Institute of Child Health, University College, London WC1N 1EH, UK
| | - Gordon Stamp
- Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK
| | - Ian Rosewell
- Genetic Manipulation Services, Francis Crick Institute, Clare Hall, Herts EN6 3LD, UK
| | - Pedro Cutillas
- John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK
| | - Holger Gerhardt
- Max-Delbrück-Center for Molecular Medicine, Robert-Rössle-Strasse 10, 13125 Berlin, Germany
| | - Peter J Parker
- Protein Phosphorylation Laboratory, Francis Crick Institute, 44 Lincoln's Inn Fields, London WC2A 3LY, UK; Division of Cancer Studies, King's College London, New Hunt's House, Saint Thomas Street, London SE1 1UL, UK.
| | - Angus J M Cameron
- Kinase Biology Laboratory, John Vane Science Centre, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ, UK.
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41
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Crews SM, McCleery WT, Hutson MS. Pathway to a phenocopy: Heat stress effects in early embryogenesis. Dev Dyn 2015; 245:402-13. [PMID: 26498920 DOI: 10.1002/dvdy.24360] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 10/09/2015] [Accepted: 10/13/2015] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Heat shocks applied at the onset of gastrulation in early Drosophila embryos frequently lead to phenocopies of U-shaped mutants-having characteristic failures in the late morphogenetic processes of germband retraction and dorsal closure. The pathway from nonspecific heat stress to phenocopied abnormalities is unknown. RESULTS Drosophila embryos subjected to 30-min, 38 °C heat shocks at gastrulation appear to recover and restart morphogenesis. Post-heat-shock development appears normal, albeit slower, until a large fraction of embryos develop amnioserosa holes (diameters > 100 µm). These holes are positively correlated with terminal U-shaped phenocopies. They initiate between amnioserosa cells and open over tens of minutes by evading normal wound healing responses. They are not caused by tissue-wide increases in mechanical stress or decreases in cell-cell adhesion, but instead appear to initiate from isolated apoptosis of amnioserosa cells. CONCLUSIONS The pathway from heat shock to U-shaped phenocopies involves the opening of one or more large holes in the amnioserosa that compromise its structural integrity and lead to failures in morphogenetic processes that rely on amnioserosa-generated tensile forces. The proposed mechanism by which heat shock leads to hole initiation and expansion is heterochonicity, i.e., disruption of morphogenetic coordination between embryonic and extra-embryonic cell types.
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Affiliation(s)
- Sarah M Crews
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee
| | - W Tyler McCleery
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee
| | - M Shane Hutson
- Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee.,Vanderbilt Institute for Integrative Biosystem Research and Education, Vanderbilt University, Nashville, Tennessee
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42
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Abstract
Signaling via the Rho GTPases provides crucial regulation of numerous cell polarization events, including apicobasal (AB) polarity, polarized cell migration, polarized cell division and neuronal polarity. Here we review the relationships between the Rho family GTPases and epithelial AB polarization events, focusing on the 3 best-characterized members: Rho, Rac and Cdc42. We discuss a multitude of processes that are important for AB polarization, including lumen formation, apical membrane specification, cell-cell junction assembly and maintenance, as well as tissue polarity. Our discussions aim to highlight the immensely complex regulatory mechanisms that encompass Rho GTPase signaling during AB polarization. More specifically, in this review we discuss several emerging common themes, that include: 1) the need for Rho GTPase activities to be carefully balanced in both a spatial and temporal manner through a multitude of mechanisms; 2) the existence of signaling feedback loops and crosstalk to create robust cellular responses; and 3) the frequent multifunctionality that exists among AB polarity regulators. Regarding this latter theme, we provide further discussion of the potential plasticity of the cell polarity machinery and as a result the possible implications for human disease.
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Key Words
- AB, Apicobasal
- AJ, Adherens junction
- Amot, Angiomotin
- Arp2/3, Actin-related protein-2/3
- Baz, Bazooka
- C. elegans, Caenorhabditis elegans
- CA, Constitutively-active
- CD2AP, CD2-associated protein
- Caco2, Human colon carcinoma
- Cdc42
- Cora, Coracle
- Crb, Crumbs
- DN, Dominant-negative
- Dia1, Diaphanous-related formin 1
- Dlg, Discs large
- Drosophila, Drosophila melanogaster
- Dys-β, Dystrobrevin-β
- ECM, Extracellular matrix
- Ect2, Epithelial cell transforming sequence 2 oncogene
- Eya1, Eyes absent 1
- F-actin, Filamentous actin
- FRET, Fluorescence resonance energy transfer
- GAP, GTPase-activating protein
- GDI, Guanine nucleotide dissociation inhibitor
- GEF, Guanine nucleotide exchange factor
- GTPases
- JACOP, Junction-associated coiled-coiled protein
- JAM, Junctional adhesion molecule
- LKB1, Liver kinase B1
- Lgl, Lethal giant larvae
- MDCK, Madin-Darby canine kidney
- MTOC, Microtubule-organizing center
- NrxIV, Neurexin IV
- Pals1, Protein associated with Lin-7 1
- Par, Partitioning-defective
- Patj, Pals1-associated TJ protein
- ROCK, Rho-associated kinase
- Rac
- Rho
- Rich1, RhoGAP interacting with CIP4 homologues
- S. cerevisiae, Saccharomyces cerevisiae
- S. pombe, Schizosaccharomyces pombe
- SH3BP1, SH3-domain binding protein 1
- Scrib, Scribble
- Std, Stardust
- TEM4, Tumor endothelial marker 4
- TJ, Tight junction
- Tiam1, T-cell lymphoma invasion and metastasis-inducing protein 1
- WASp, Wiskott-aldrich syndrome protein
- Yrt, Yurt
- ZA, zonula adherens
- ZO, Zonula occludens
- aPKC, Atypical Protein Kinase C
- apicobasal
- epithelia
- junction
- par
- polarity
- α-cat, Alpha-catenin
- β-cat, Beta-Catenin
- β2-syn, Beta-2-syntrophin
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Affiliation(s)
- Natalie Ann Mack
- a School of Life Sciences; Queens Medical Center ; University of Nottingham ; Nottingham , UK
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43
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Ravasio A, Cheddadi I, Chen T, Pereira T, Ong HT, Bertocchi C, Brugues A, Jacinto A, Kabla AJ, Toyama Y, Trepat X, Gov N, Neves de Almeida L, Ladoux B. Gap geometry dictates epithelial closure efficiency. Nat Commun 2015; 6:7683. [PMID: 26158873 PMCID: PMC4510701 DOI: 10.1038/ncomms8683] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 06/02/2015] [Indexed: 12/12/2022] Open
Abstract
Closure of wounds and gaps in tissues is fundamental for the correct development and physiology of multicellular organisms and, when misregulated, may lead to inflammation and tumorigenesis. To re-establish tissue integrity, epithelial cells exhibit coordinated motion into the void by active crawling on the substrate and by constricting a supracellular actomyosin cable. Coexistence of these two mechanisms strongly depends on the environment. However, the nature of their coupling remains elusive because of the complexity of the overall process. Here we demonstrate that epithelial gap geometry in both in vitro and in vivo regulates these collective mechanisms. In addition, the mechanical coupling between actomyosin cable contraction and cell crawling acts as a large-scale regulator to control the dynamics of gap closure. Finally, our computational modelling clarifies the respective roles of the two mechanisms during this process, providing a robust and universal mechanism to explain how epithelial tissues restore their integrity.
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Affiliation(s)
- Andrea Ravasio
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Ibrahim Cheddadi
- Sorbonne Universités, UPMC University Paris 06, CNRS UMR 7598, Laboratoire Jacques-Louis Lions, F-75252 Paris, France
| | - Tianchi Chen
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Telmo Pereira
- CEDOC - Chronic Diseases Research Center, NOVA Medical School, Rua Camara Pestana, 6, Lisbon, 1150-082 Lisbon, Portugal
| | - Hui Ting Ong
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Cristina Bertocchi
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Agusti Brugues
- ICREA at Institute for Bioengineering of Catalonia and Universitat de Barcelona, 08028 Barcelona, Spain
| | - Antonio Jacinto
- CEDOC - Chronic Diseases Research Center, NOVA Medical School, Rua Camara Pestana, 6, Lisbon, 1150-082 Lisbon, Portugal
| | - Alexandre J Kabla
- Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, UK
| | - Yusuke Toyama
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore.,Department of Biological Sciences National University of Singapore, Singapore 117543, Singapore.,Temasek Life Sciences Laboratory, Singapore 117604, Singapore
| | - Xavier Trepat
- ICREA at Institute for Bioengineering of Catalonia and Universitat de Barcelona, 08028 Barcelona, Spain
| | - Nir Gov
- Weizmann Institute of Science, Rehovot 76100, Israel
| | - Luís Neves de Almeida
- Sorbonne Universités, UPMC University Paris 06, CNRS UMR 7598, Laboratoire Jacques-Louis Lions, F-75252 Paris, France.,INRIA-Paris-Rocquencourt, MAMBA Team, 78153 Le Chesnay, Domaine de Voluceau BP105, France
| | - Benoit Ladoux
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore.,Institut Jacques Monod (IJM), CNRS UMR 7592 and Université Paris Diderot, 75013 Paris, France
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Saias L, Swoger J, D’Angelo A, Hayes P, Colombelli J, Sharpe J, Salbreux G, Solon J. Decrease in Cell Volume Generates Contractile Forces Driving Dorsal Closure. Dev Cell 2015; 33:611-21. [DOI: 10.1016/j.devcel.2015.03.016] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 08/18/2014] [Accepted: 03/16/2015] [Indexed: 01/06/2023]
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Chanet S, Martin AC. Mechanical force sensing in tissues. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 126:317-52. [PMID: 25081624 DOI: 10.1016/b978-0-12-394624-9.00013-0] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Tissue size, shape, and organization reflect individual cell behaviors such as proliferation, shape change, and movement. Evidence suggests that mechanical signals operate in tandem with biochemical cues to properly coordinate cell behavior and pattern tissues. The objective of this chapter is to present recent evidence demonstrating that forces transmitted between cells act as signals that coordinate cell behavior across tissues. We first briefly summarize molecular and cellular mechanisms by which forces are sensed by cells with an emphasis on forces generated and transmitted by cytoskeletal networks. We then discuss evidence for these mechanisms operating in multicellular contexts to coordinate complex cell and tissue behaviors that occur during embryonic development: specifically growth and morphogenesis.
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Affiliation(s)
- Soline Chanet
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Adam C Martin
- Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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Vedula SRK, Peyret G, Cheddadi I, Chen T, Brugués A, Hirata H, Lopez-Menendez H, Toyama Y, de Almeida LN, Trepat X, Lim CT, Ladoux B. Mechanics of epithelial closure over non-adherent environments. Nat Commun 2015; 6:6111. [PMID: 25608921 PMCID: PMC4309897 DOI: 10.1038/ncomms7111] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 12/15/2014] [Indexed: 11/16/2022] Open
Abstract
The closure of gaps within epithelia is crucial to maintain its integrity during biological processes such as wound healing and gastrulation. Depending on the distribution of extracellular matrix, gap closure occurs through assembly of multicellular actin-based contractile cables or protrusive activity of border cells into the gap. Here we show that the supracellular actomyosin contractility of cells near the gap edge exerts sufficient tension on the surrounding tissue to promote closure of non-adherent gaps. Using traction force microscopy, we observe that cell-generated forces on the substrate at the gap edge first point away from the centre of the gap and then increase in the radial direction pointing into the gap as closure proceeds. Combining with numerical simulations, we show that the increase in force relies less on localized purse-string contractility and more on large-scale remodelling of the suspended tissue around the gap. Our results provide a framework for understanding the assembly and the mechanics of cellular contractility at the tissue level. Closure of epithelial gaps such as wounds is thought to involve contraction of an actomyosin ‘purse-string’. By creating non-adherent gaps to exclude contributions of adhesive protrusion, the authors find that large-scale tension, more than purse-string contraction, mediates closure.
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Affiliation(s)
| | - Grégoire Peyret
- 1] Institut Jacques Monod (IJM), CNRS UMR 7592 and Université Paris Diderot, 75013 Paris, France [2] Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, 08036 Barcelona, Spain
| | - Ibrahim Cheddadi
- 1] Sorbonne Universités, UPMC Univ Paris 06 and CNRS UMR 7598, Laboratoire Jacques-Louis Lions, F-75252 Paris, France [2] INRIA-Paris-Rocquencourt, MAMBA Team, Domaine de Voluceau, BP105, 78153 Le Chesnay Cedex, France
| | - Tianchi Chen
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Agustí Brugués
- Institute for Bioengineering of Catalonia, C/ Baldiri Reixac 10-12, 08028 Barcelona, Spain
| | - Hiroaki Hirata
- Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore
| | - Horacio Lopez-Menendez
- Institut Jacques Monod (IJM), CNRS UMR 7592 and Université Paris Diderot, 75013 Paris, France
| | - Yusuke Toyama
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543 Singapore [3] Temasek Life Sciences Laboratory, 1 Research Link, National University of Singapore, Singapore 117604, Singapore
| | - Luís Neves de Almeida
- 1] Sorbonne Universités, UPMC Univ Paris 06 and CNRS UMR 7598, Laboratoire Jacques-Louis Lions, F-75252 Paris, France [2] INRIA-Paris-Rocquencourt, MAMBA Team, Domaine de Voluceau, BP105, 78153 Le Chesnay Cedex, France
| | - Xavier Trepat
- 1] Institute for Bioengineering of Catalonia, C/ Baldiri Reixac 10-12, 08028 Barcelona, Spain [2] Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluís Companys, 23 08010 Barcelona, Spain [3] Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, 08036 Barcelona, Spain
| | - Chwee Teck Lim
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Department of Biomedical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore [3] Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117575, Singapore
| | - Benoit Ladoux
- 1] Mechanobiology Institute, National University of Singapore, Singapore 117411, Singapore [2] Institut Jacques Monod (IJM), CNRS UMR 7592 and Université Paris Diderot, 75013 Paris, France
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Brugués A, Anon E, Conte V, Veldhuis JH, Gupta M, Colombelli J, Muñoz JJ, Brodland GW, Ladoux B, Trepat X. Forces driving epithelial wound healing. NATURE PHYSICS 2014; 10:683-690. [PMID: 27340423 PMCID: PMC4915550 DOI: 10.1038/nphys3040] [Citation(s) in RCA: 239] [Impact Index Per Article: 23.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A fundamental feature of multicellular organisms is their ability to self-repair wounds through the movement of epithelial cells into the damaged area. This collective cellular movement is commonly attributed to a combination of cell crawling and "purse-string" contraction of a supracellular actomyosin ring. Here we show by direct experimental measurement that these two mechanisms are insufficient to explain force patterns observed during wound closure. At early stages of the process, leading actin protrusions generate traction forces that point away from the wound, showing that wound closure is initially driven by cell crawling. At later stages, we observed unanticipated patterns of traction forces pointing towards the wound. Such patterns have strong force components that are both radial and tangential to the wound. We show that these force components arise from tensions transmitted by a heterogeneous actomyosin ring to the underlying substrate through focal adhesions. The structural and mechanical organization reported here provides cells with a mechanism to close the wound by cooperatively compressing the underlying substrate.
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Affiliation(s)
- Agustí Brugués
- Institute for Bioengineering of Catalonia, Barcelona, Spain
| | - Ester Anon
- Institute for Bioengineering of Catalonia, Barcelona, Spain
- Institut Jacques Monod (IJM), Université Paris Diderot, and Unité Mixte de Recherche 7592 CNRS, Paris, France
| | - Vito Conte
- Institute for Bioengineering of Catalonia, Barcelona, Spain
| | - Jim H. Veldhuis
- Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - Mukund Gupta
- Mechanobiology Institute (MBI), National University of Singapore, Singapore
| | - Julien Colombelli
- Institute for Research in Biomedicine (IRB Barcelona), Barcelona, Spain
| | - José J. Muñoz
- Laboratori de Càlcul Numèric, Department of Applied Mathematics III, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - G. Wayne Brodland
- Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario, Canada
| | - Benoit Ladoux
- Institut Jacques Monod (IJM), Université Paris Diderot, and Unité Mixte de Recherche 7592 CNRS, Paris, France
- Mechanobiology Institute (MBI), National University of Singapore, Singapore
- Corresponding authors: Prof. Xavier Trepat, Institute for Bioengineering of Catalonia C/ Baldiri Reixac 15-21 Barcelona 08028 Spain Tel: +34934020265 ; Prof. Benoit Ladoux Institut Jacques Monod, Université Paris Diderot & CNRS UMR 7592 Batiment Buffon 15 rue Hélène Brion 75013 Paris, France
| | - Xavier Trepat
- Institute for Bioengineering of Catalonia, Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
- Unitat de Biofísica i Bioenginyeria, Facultat de Medicina, Universitat de Barcelona, and CIBERES, Spain
- Corresponding authors: Prof. Xavier Trepat, Institute for Bioengineering of Catalonia C/ Baldiri Reixac 15-21 Barcelona 08028 Spain Tel: +34934020265 ; Prof. Benoit Ladoux Institut Jacques Monod, Université Paris Diderot & CNRS UMR 7592 Batiment Buffon 15 rue Hélène Brion 75013 Paris, France
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Nowotarski SH, McKeon N, Moser RJ, Peifer M. The actin regulators Enabled and Diaphanous direct distinct protrusive behaviors in different tissues during Drosophila development. Mol Biol Cell 2014; 25:3147-65. [PMID: 25143400 PMCID: PMC4196866 DOI: 10.1091/mbc.e14-05-0951] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Actin-based protrusions are important for signaling and migration during development and homeostasis. Gain- and loss-of-function and quantitative approaches are used to define differential roles for the actin elongation factors Diaphanous and Enabled in regulating distinct protrusive behaviors in different tissues during Drosophila morphogenesis. Actin-based protrusions are important for signaling and migration during development and homeostasis. Defining how different tissues in vivo craft diverse protrusive behaviors using the same genomic toolkit of actin regulators is a current challenge. The actin elongation factors Diaphanous and Enabled both promote barbed-end actin polymerization and can stimulate filopodia in cultured cells. However, redundancy in mammals and Diaphanous’ role in cytokinesis limited analysis of whether and how they regulate protrusions during development. We used two tissues driving Drosophila dorsal closure—migratory leading-edge (LE) and nonmigratory amnioserosal (AS) cells—as models to define how cells shape distinct protrusions during morphogenesis. We found that nonmigratory AS cells produce filopodia that are morphologically and dynamically distinct from those of LE cells. We hypothesized that differing Enabled and/or Diaphanous activity drives these differences. Combining gain- and loss-of-function with quantitative approaches revealed that Diaphanous and Enabled each regulate filopodial behavior in vivo and defined a quantitative “fingerprint”—the protrusive profile—which our data suggest is characteristic of each actin regulator. Our data suggest that LE protrusiveness is primarily Enabled driven, whereas Diaphanous plays the primary role in the AS, and reveal each has roles in dorsal closure, but its robustness ensures timely completion in their absence.
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Affiliation(s)
- Stephanie H Nowotarski
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Natalie McKeon
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Rachel J Moser
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
| | - Mark Peifer
- Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599 Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599
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Ferreira T, Prudêncio P, Martinho RG. Drosophila protein kinase N (Pkn) is a negative regulator of actin-myosin activity during oogenesis. Dev Biol 2014; 394:277-91. [PMID: 25131196 DOI: 10.1016/j.ydbio.2014.08.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 08/08/2014] [Accepted: 08/09/2014] [Indexed: 02/05/2023]
Abstract
Nurse cell dumping is an actin-myosin based process, where 15 nurse cells of a given egg chamber contract and transfer their cytoplasmic content through the ring canals into the growing oocyte. We isolated two mutant alleles of protein kinase N (pkn) and showed that Pkn negatively-regulates activation of the actin-myosin cytoskeleton during the onset of dumping. Using live-cell imaging analysis we observed that nurse cell dumping rates sharply increase during the onset of fast dumping. Such rate increase was severely impaired in pkn mutant nurse cells due to excessive nurse cell actin-myosin activity and/or loss of tissue integrity. Our work demonstrates that the transition between slow and fast dumping is a discrete event, with at least a five to six-fold dumping rate increase. We show that Pkn negatively regulates nurse cell actin-myosin activity. This is likely to be important for directional cytoplasmic flow. We propose Pkn provides a negative feedback loop to help avoid excessive contractility after local activation of Rho GTPase.
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Affiliation(s)
- Tânia Ferreira
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras 2781-901, Portugal
| | - Pedro Prudêncio
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras 2781-901, Portugal; Departamento de Ciências Biomédicas e Medicina, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal; IBB-Institute for Biotechnology and Bioengineering, Centro de Biomedicina Molecular e Estrutural, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Rui Gonçalo Martinho
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras 2781-901, Portugal; Departamento de Ciências Biomédicas e Medicina, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal; IBB-Institute for Biotechnology and Bioengineering, Centro de Biomedicina Molecular e Estrutural, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
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50
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Llamusí B, Muñoz-Soriano V, Paricio N, Artero R. The use of whole-mount in situ hybridization to illustrate gene expression regulation. BIOCHEMISTRY AND MOLECULAR BIOLOGY EDUCATION : A BIMONTHLY PUBLICATION OF THE INTERNATIONAL UNION OF BIOCHEMISTRY AND MOLECULAR BIOLOGY 2014; 42:339-347. [PMID: 24979316 DOI: 10.1002/bmb.20807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 04/22/2014] [Accepted: 04/23/2014] [Indexed: 06/03/2023]
Abstract
In situ hybridization is a widely used technique for studying gene expression. Here, we describe two experiments addressed to postgraduate genetics students in which the effect of transcription factors on gene expression is analyzed in Drosophila embryos of different genotypes by whole-mount in situ hybridization. In one of the experiments, students analyzed the repressive effect of Snail over rhomboid expression using reporter lines containing different constructs of the rhomboid neuroectodermal enhancer fused to the lacZ gene. In the second experiment, the epistatic relationship between the cabut and decapentaplegic genes was analyzed. These simple experiments allowed students to (1) understand the role of transcription factors and cis-regulatory elements over gene expression regulation and (2) practice a widespread laboratory technique, in situ hybridization with nonradioactive labeled probes, to detect gene expression patterns. These experiments required 12 hr and were organized into four daily sessions that included the discussion of the results with students. Examples of the results obtained and their relevance are shown and discussed herein. The methods described in these laboratory exercises can be easily adapted to model organisms other than Drosophila.
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Affiliation(s)
- Beatriz Llamusí
- Department of Genetics, Faculty of Biology, Universitat de València, Valencia, Spain; INCLIVA Health Research Institute, Valencia, Spain
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