Abstract
The morphogenetic remodelling of embryo architecture after implantation culminates in pro-amniotic cavity formation. Despite its key importance, how this transformation occurs remains unknown. Here, we apply high-resolution imaging of embryos developing in vivo and in vitro, spatial RNA sequencing and 3D trophoblast stem cell models to determine the sequence and mechanisms of these remodelling events. We show that cavitation of the embryonic tissue is followed by folding of extra-embryonic tissue to mediate the formation of a second extra-embryonic cavity. Concomitantly, at the boundary between embryonic and extra-embryonic tissues, a hybrid 3D rosette forms. Resolution of this rosette enables the embryonic cavity to invade the extra-embryonic tissue. Subsequently, β1-integrin signalling mediates the formation of multiple extra-embryonic 3D rosettes. Podocalyxin exocytosis leads to their polarized resolution, permitting the extension of embryonic and extra-embryonic cavities and their fusion into a unified pro-amniotic cavity. These morphogenetic transformations of embryogenesis reveal a previously unappreciated mechanism for lumen expansion and fusion.
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Data availability
RNA-seq data that support the findings of this study have been deposited in the Gene Expression Omnibus (GEO) under accession code GSE110808. Source data for Figs. 1b, 2c,e,g,i,j,l and 3c,h and Supplementary Fig. 3c,d have been provided as Supplementary Table 2. Source data for Fig. 1g,h, 3e,f, 4d,f and 5c,d and Supplementary Fig. 3c are provided as Supplementary Videos. All other data supporting the findings of this study are available from the corresponding author on reasonable request.
Change history
19 November 2018
In the version of this Article originally published, the first name of author Guangdun Peng was spelled incorrectly as Guangdum. This has now been amended in all versions of the Article.
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Acknowledgements
We are grateful to D. Glover, F. Antonica, M. Shahbazi, G. Amadei and S. Harrison for feedback on the manuscript. We also thanks J. Nichols for the Confetti TSCs, I. Roswell (Francis Crick Institute) for LifeAct-GFP mice and K. O’Holleran (Cambridge Advanced Imaging Center) for help with the laser ablation experiments. The M.Z.-G. lab is supported by grants from the European Research Council (669198) and the Welcome Trust (098287/Z/12/Z), and the EU Horizon 2020 Marie Sklodowska-Curie actions (ImageInLife, 721537). C.K. is supported by the BBSRC Doctoral training studentship.
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Contributions
N.C. and C.K. designed and carried out the experiments and data analysis. A.W. contributed to embryo live imaging. G.C. and G.P. performed the embryo cryosection, laser microdissection and library construction experiments for RNA-seq. R.W. carried out the RNA-seq analysis. N.J. supervised the work related to spatial trancriptome analysis. M.Z.-G. conceived and supervised the study and wrote the manuscript with the help of N.C. and C.K.
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Integrated supplementary information
Supplementary Figure 1 Analysis of extra-embryonic ectoderm tissue folding in embryos derived after decidua fixation.
(a) Experimental strategy for post-fixation embryo recovery. (b) Representative E5.0 recovered from a fixed decidua. Accumulation of actin and phosphorylated myosin (arrows) is evident at the proximal tip of extra-embryonic ectoderm cells in recovered embryos post-fixation. This indicates that apical actin accumulation and apical constriction tissue folding (see Fig. 1) is an active morphogenetic process and not a wound healing response stemming from the recovery of embryos from deciduae. (c) 3 representative examples of E5.0 embryos recovered from fixed deciduae. Arrows indicate actin apical accumulation at extra-embryonic ectoderm most proximal cells. Image represents 3 biological replicates. Scale bars= 20 um.
Supplementary Figure 2 ECM/ β1-integrin during extra-embryonic ectoderm and TSCs polarization.
(a) ECM/ β1-integrin localization in E5.5 embryo revealed by antibodies for laminin, β1-integrin and active β1-integrin (9EG7). Image representative of 10 embryos (b) Representative examples of TSC clumps culture in suspension in the presence or absence of Matrigel. In the absence of Matrigel TSCs fail to polarize. Specifically the cells fail to acquire columnar morphology (indicated by F-actin staining) and they don’t display apical Golgi polarization (GM130 staining; arrowheads) compared with TSCs cultured in the presence of Matrigel. Image representative of 3 biological replicates (c) The effect of collagenase IV (COLIV) treatment on the surrounding basement membrane (assessed by laminin, collagen and perlecan staining) of E5.5 embryos cultured for 5h in the presence or absence of COLIV. Image representative of 5 biological replicates (d) β1-integrin activation status (indicated by 9EG7 antibody staining) in control and COLIV treated embryos. White arrowheads indicate basal site of ExE outside cells. Image representative of 2 biological replicates (e) The effect of COLIV treatment on the localization of the tight junction’s localisation assessed by ZO-1 staining in E5.5 embryos (two different z slices in control embryo; Z1 and Z2). Arrows point to apical site while arrowheads point towards the basal site. Image representative of 10 embryos (f) β1-integrin activation status (indicated by 9EG7 antibody staining) in control and β1-integrin blocking antibody (Ha2/5) treated TSCs in 3D culture; Image representative of 2 biological replicates. Scale bars=20um.
Supplementary Figure 3 Characterization of extra-embryonic ectoderm cells.
(a) Images of different Z slices (0.8 um) from a representative E5.5 (Stage III) embryo. Extra-embryonic ectoderm (ExE) rosettes are outlined with a dashed line. Arrows denote rosettes’ centre. Image representative of 20 embryos (b) Representative example of an ExE rosette (dashed outline) found in E5.5 embryo as revealed by cell morphology (E-cadherin) and polarization (ZO-1). Orthogonal views (XZ, YZ) of the embryo are displayed on the right and the bottom of the image with the segmented rosette as viewed in the respective orthoslice. Image representative of 20 embryos. (c) Cell aspect ratio comparison of outside, inside vs inside cells that contribute to rosettes (Inside cells, R). Two sided unpaired student t-test;****p<0.0001;mean± SEM; n=50 inside cells and n=47 inside rosette cells. (d) Plot of long and short axis. Two separate clusters are indicated (magenta and grey outlines). Cluster shown with magenta consists of outside cells and inside cells contributing to rosettes (inside cells R). Cluster shown with grey consists of inside cells that do not contribute to rosettes. Blue dashed line: y=x. n=50 outside and inside cells and n=47 inside rosette cells. Scale bars=20um.
Supplementary Figure 4 Epiblast remodelling upon hybrid rosette resolution.
Stills from a time lapse movie of a LifeAct-GFP embryo showing epiblast EPI remodelling after hybrid rosette resolution. Cells are arbitrarily colour-coded for tracking. EPI: purple, yellow and cyan cells; ExE: blue, red and green cells. Image representative of 3 embryos. Scale bar=20um.
Supplementary Figure 5 Extra-embryonic ectoderm rosettes facilitate cavities extension and fusion.
(a) Representative example of E5.5 (stage III) embryo stained for E-Cadherin. White dots label the cells contributing to the epiblast (EPI) cavity’s proximal rosette (adjacent to EPI-ExE boundary). Image representative of 15 embryos. (b) Example of a resolving EPI cavity’s proximal rosette (dots show cells contributing to the rosette) through loss of cell-cell contacts (cells marked with hollow dots) of ExE cells at the boundary. YZ projection is displayed on the right of the image. Image representative of 10 embryos (c) Stills from a time lapse movie of an E5.5 LifeAct-GFP embryo showing EPI cavity expansion after EPI cavity’s proximal rosette resolution. Cells are arbitrarily color-coded for tracking. Image representative of 3 embryos (d)E5.5 (stage III) embryo stained for E-Cadherin and tight junction protein ZO-1. Two different z slices are presented (Z0 and Z17, Z step=0.8 um) one showing the ExE cavity and the other the overlaying rosette (white dots). YZ projection of rosette (white dots showing cells contributing to rosette) and ExE cavities shown on the far right of the panel. *=ExE cavity, **=EPI cavity. Image representative of 10 embryos. (e) Representative example of ExE cavity (asterisk in YZ projections, right panel) connected with the centre of an ExE cavity proximal rosette (arrowhead points to the centre of this rosette; magenta dots indicate cells contributing to both rosette and ExE cavity where white dots indicate the rest of rosette’s cells) through a tract of ZO-1 (arrow). White dotted line = EPI-ExE boundary. *=ExE cavity, **=EPI cavity. Image representative of 10 embryos. (f) Two representative examples of an invading EPI cavity and an extended ExE cavity connected with a polarized tract of ZO-1 (white circle). Image representative of 6 embryos. Scale bars = 20um.
Supplementary Figure 6 Spatial transcriptome analysis of E5.25-E5.75 embryos.
(a) Principal component analysis (PCA) of sections along the proximo-distal embryo axis from at E5.25, E5.5 and E5.75. Yellow outline: VE, Purple outline: epiblast (EPI), Cyan outline: extra-embryonic ectoderm (ExE). (b) Gene expression pattern for EPI (Pou5f1) and ExE (CDX2) markers from E5.25-E5.75. (c) Gene expression pattern for Wnt3 and T from E5.25-E5.75. (d) Differential gene expression analysis heat maps for GO term: integrin mediated signalling. E5.25: sections 2-4 EPI, sections 6-8 ExE ; E5.5: sections 2,4,5 EPI, sections 6-11 ExE.
Supplementary Figure 7 Differential gene expression analysis of embryonic and extra-embryonic compartments.
(a)Differential gene expression analysis heat maps between epiblast (EPI) and extra-embryonic ectoderm (ExE) in E5.25, E5.5 and E5.75 embryos. Representative gene ontology (G0) terms enriched in each tissue are shown on the right of each heat map. E5.25: sections 2-4 EPI, sections 6-8 ExE; E5.5: sections 2,4,5 EPI, sections 6-11 ExE; E5.75 sections 3-8 EPI, sections 9-19 ExE. n=1 E5.25, n=1 E5.5 and n=1 E5.75 embryos (b) Combined principal component analysis (PCA) for embryonic and extra-embryonic sections from E5.25-E5.75. Purple outline: E5.25-E5.5 EPI; Cyan outline: E5.25-E5.5 ExE; Dashed purple outline: E5.75 EPI; Dashed cyan outline: E5.75 ExE. n=1 E5.25, n=1 E5.5 and n=1 E5.75 embryos.
Supplementary Figure 8 Cell intercalation after initial cavities fusion results in the formation of a pseudostratified epithelium.
(a)ExE acquires a pseudostratified epithelium morphology shortly after unification of the cavities. Image representative of 10 embryos. (b)After cavities fusion ExE cells show intercalative behaviour (green and yellow asterisks). Image representative of 5 embryos. (c) 3 different optical Z slices (0.6um) of a representative example of an E5.75(stage IV) embryo. Dashed outline in left panel shows pro-amniotic cavity spanning through EPI and ExE. In different Z slices (middle and right panel) ExE cells intercalating towards the basement membrane can be identified. Polarized pMLC localization displays the polarized nature of this event. Insets in middle and right panel show magnified fluorescent intensity color coded images of ExE intercalating cells. Image representative of 5 embryos. Scale bars=20um.
Supplementary information
Supplementary Information
Supplementary Figures 1–8, Supplementary Table and Supplementary Movie legends.
Supplementary Table 1
Processed RNA-seq data.
Supplementary Table 2
Statistics source data.
Supplementary Video 1
Tissue-folding-mediated extra-embryonic cavity formation.
Supplementary Video 2
Tissue-folding-mediated extra-embryonic cavity formation in 3D.
Supplementary Video 3
Apical constriction during extra-embryonic ectoderm tissue folding.
Supplementary Video 4
3D segmentation of representative extra-embryonic ectoderm rosettes.
Supplementary Video 5
3D segmentation of neighbouring extra-embryonic ectoderm rosettes.
Supplementary Video 6
Hybrid rosette resolution precedes epiblast remodelling (1).
Supplementary Video 7
Hybrid rosette resolution precedes epiblast remodelling (2).
Supplementary Video 8
Laser ablation mediated hybrid rosette resolution.
Supplementary Video 9
Polarized tract connects the centre of a rosette with the embryonic cavity.
Supplementary Video 10
ExE rosettes facilitate epiblast cavity extension (1).
Supplementary Video 11
ExE rosettes facilitate epiblast cavity extension (2).
Supplementary Video 12
ExE rosettes facilitate extra-embryonic cavity extension.
Supplementary Video 13
Rosette-mediated embryonic and extra-embryonic cavities extension.
Supplementary Video 14
Extra-embryonic ectoderm cell intercalation upon initial cavities fusion.
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Christodoulou, N., Kyprianou, C., Weberling, A. et al. Sequential formation and resolution of multiple rosettes drive embryo remodelling after implantation. Nat Cell Biol 20, 1278–1289 (2018). https://doi.org/10.1038/s41556-018-0211-3
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DOI: https://doi.org/10.1038/s41556-018-0211-3
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