1
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Harmoush B, Viebahn C, Tsikolia N. Development of node architecture and emergence of molecular organizer characteristics in the pig embryo. Dev Dyn 2024. [PMID: 38733144 DOI: 10.1002/dvdy.715] [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: 12/30/2023] [Revised: 03/17/2024] [Accepted: 03/30/2024] [Indexed: 05/13/2024] Open
Abstract
BACKGROUND The avian node is the equivalent of the amphibian Spemann's organizer, as indicated by its ability to induce a secondary axis, cellular contribution, and gene expression, whereas the node of the mouse, which displays limited inductive capacities, was suggested to be a part of spatially distributed signaling. Furthermore, the structural identity of the mouse node is subject of controversy, while little is known about equivalent structures in other mammals. RESULTS We analyzed the node and emerging organizer in the pig using morphology and the expression of selected organizer genes prior to and during gastrulation. The node was defined according to the "four-quarter model" based on comparative consideration. The node of the pig displays a multilayered, dense structure that includes columnar epithelium, bottle-like cells in the dorsal part, and mesenchymal cells ventrally. Expression of goosecoid (gsc), chordin, and brachyury, together with morphology, reveal the consecutive emergence of three distinct domains: the gastrulation precursor domain, the presumptive node, and the mature node. Additionally, gsc displays a ventral expression domain prior to epiblast epithelialization. CONCLUSION Our study defines the morphological and molecular context of the emerging organizer equivalent in the pig and suggests a sequential development of its function.
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Affiliation(s)
- Braah Harmoush
- Institute of Anatomy and Cell Biology, University Medical Centre Göttingen, Göttingen, Germany
| | - Christoph Viebahn
- Institute of Anatomy and Cell Biology, University Medical Centre Göttingen, Göttingen, Germany
| | - Nikoloz Tsikolia
- Institute of Anatomy and Cell Biology, University Medical Centre Göttingen, Göttingen, Germany
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2
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Pfeffer PL. Alternative mammalian strategies leading towards gastrulation: losing polar trophoblast (Rauber's layer) or gaining an epiblast cavity. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210254. [PMID: 36252216 PMCID: PMC9574635 DOI: 10.1098/rstb.2021.0254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Using embryological data from 14 mammalian orders, the hypothesis is presented that in placental mammals, epiblast cavitation and polar trophoblast loss are alternative developmental solutions to shield the central epiblast from extraembryonic signalling. It is argued that such reciprocal signalling between the edge of the epiblast and the adjoining polar trophoblast or edge of the mural trophoblast or with the amniotic ectoderm is necessary for the induction of gastrulation. 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)
- Peter L. Pfeffer
- School of Biological Sciences, Victoria University of Wellington, Kelburn Parade, Wellington 6010, New Zealand
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3
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Bouchereau W, Jouneau L, Archilla C, Aksoy I, Moulin A, Daniel N, Peynot N, Calderari S, Joly T, Godet M, Jaszczyszyn Y, Pratlong M, Severac D, Savatier P, Duranthon V, Afanassieff M, Beaujean N. Major transcriptomic, epigenetic and metabolic changes underlie the pluripotency continuum in rabbit preimplantation embryos. Development 2022; 149:276385. [DOI: 10.1242/dev.200538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 08/11/2022] [Indexed: 11/20/2022]
Abstract
ABSTRACT
Despite the growing interest in the rabbit model for developmental and stem cell biology, the characterization of embryos at the molecular level is still poorly documented. We conducted a transcriptome analysis of rabbit preimplantation embryos from E2.7 (morula stage) to E6.6 (early primitive streak stage) using bulk and single-cell RNA-sequencing. In parallel, we studied oxidative phosphorylation and glycolysis, and analysed active and repressive epigenetic modifications during blastocyst formation and expansion. We generated a transcriptomic, epigenetic and metabolic map of the pluripotency continuum in rabbit preimplantation embryos, and identified novel markers of naive pluripotency that might be instrumental for deriving naive pluripotent stem cell lines. Although the rabbit is evolutionarily closer to mice than to primates, we found that the transcriptome of rabbit epiblast cells shares common features with those of humans and non-human primates.
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Affiliation(s)
- Wilhelm Bouchereau
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Luc Jouneau
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Catherine Archilla
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Irène Aksoy
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Anais Moulin
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Nathalie Daniel
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Nathalie Peynot
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Sophie Calderari
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Thierry Joly
- ISARA-Lyon 4 , F-69007 Lyon , France
- VetAgroSup, UPSP ICE 5 , F-69280 Marcy l'Etoile , France
| | - Murielle Godet
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Yan Jaszczyszyn
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC) 6 , 91198 Gif-sur-Yvette , France
| | - Marine Pratlong
- MGX, Université Montpellier, CNRS, INSERM 7 , 34094 Montpellier , France
| | - Dany Severac
- MGX, Université Montpellier, CNRS, INSERM 7 , 34094 Montpellier , France
| | - Pierre Savatier
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Véronique Duranthon
- Université Paris-Saclay, UVSQ, INRAE, BREED 2 , 78350 Jouy-en-Josas , France
- Ecole Nationale Vétérinaire d'Alfort, BREED 3 , 94700 Maisons-Alfort , France
| | - Marielle Afanassieff
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
| | - Nathalie Beaujean
- Université Lyon 1, INSERM, Stem Cell and Brain Research Institute U1208, INRAE USC 1361 1 , F-69500 Bron , France
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4
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Arias AM, Marikawa Y, Moris N. Gastruloids: Pluripotent stem cell models of mammalian gastrulation and embryo engineering. Dev Biol 2022; 488:35-46. [PMID: 35537519 PMCID: PMC9477185 DOI: 10.1016/j.ydbio.2022.05.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 04/29/2022] [Accepted: 05/02/2022] [Indexed: 12/12/2022]
Abstract
Gastrulation is a fundamental and critical process of animal development whereby the mass of cells that results from the proliferation of the zygote transforms itself into a recognizable outline of an organism. The last few years have seen the emergence of a number of experimental models of early mammalian embryogenesis based on Embryonic Stem (ES) cells. One of this is the Gastruloid model. Gastruloids are aggregates of defined numbers of ES cells that, under defined culture conditions, undergo controlled proliferation, symmetry breaking, and the specification of all three germ layers characteristic of vertebrate embryos, and their derivatives. However, they lack brain structures and, surprisingly, reveal a disconnect between cell type specific gene expression and tissue morphogenesis, for example during somitogenesis. Gastruloids have been derived from mouse and human ES cells and several variations of the original model have emerged that reveal a hereto unknown modularity of mammalian embryos. We discuss the organization and development of gastruloids in the context of the embryonic stages that they represent, pointing out similarities and differences between the two. We also point out their potential as a reproducible, scalable and searchable experimental system and highlight some questions posed by the current menagerie of gastruloids.
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Affiliation(s)
- Alfonso Martinez Arias
- Systems Bioengineering, MELIS, Universidad Pompeu Fabra, Doctor Aiguader, 88, ICREA, Pag Lluis Companys 23, Barcelona, Spain.
| | - Yusuke Marikawa
- Institute for Biogenesis Research, University of Hawaii John A. Burns School of Medicine, Honolulu, HI, 96813, USA
| | - Naomi Moris
- The Francis Crick Institute, 1 Midland Road, London, NW1 1AT, UK
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5
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A hexa-species transcriptome atlas of mammalian embryogenesis delineates metabolic regulation across three different implantation modes. Nat Commun 2022; 13:3407. [PMID: 35710749 PMCID: PMC9203550 DOI: 10.1038/s41467-022-30194-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 04/21/2022] [Indexed: 12/16/2022] Open
Abstract
Mammalian embryogenesis relies on glycolysis and oxidative phosphorylation to balance the generation of biomass with energy production. However, the dynamics of metabolic regulation in the postimplantation embryo in vivo have remained elusive due to the inaccessibility of the implanted conceptus for biochemical studies. To address this issue, we compiled single-cell embryo profiling data in six mammalian species and determined their metabolic dynamics through glycolysis and oxidative phosphorylation associated gene expression. Strikingly, we identify a conserved switch from bivalent respiration in the late blastocyst towards a glycolytic metabolism in early gastrulation stages across species, which is independent of embryo implantation. Extraembryonic lineages followed the dynamics of the embryonic lineage, except visceral endoderm. Finally, we demonstrate that in vitro primate embryo culture substantially impacts metabolic gene regulation by comparison to in vivo samples. Our work reveals a conserved metabolic programme despite different implantation modes and highlights the need to optimise postimplantation embryo culture protocols.
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6
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Sheng G, Martinez Arias A, Sutherland A. The primitive streak and cellular principles of building an amniote body through gastrulation. Science 2021; 374:abg1727. [PMID: 34855481 DOI: 10.1126/science.abg1727] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
[Figure: see text].
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Affiliation(s)
- Guojun Sheng
- International Research Center for Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Alfonso Martinez Arias
- Systems Bioengineering, DCEXS, Universidad Pompeu Fabra, Doctor Aiguader, 88 ICREA, Pag Lluis Companys 23, Barcelona, Spain
| | - Ann Sutherland
- Department of Cell Biology, University of Virginia Health System, Charlottesville, VA, USA
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7
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Harmoush B, Tsikolia N, Viebahn C. Epiblast and trophoblast morphogenesis in the pre-gastrulation blastocyst of the pig. A light- and electron-microscopical study. J Morphol 2021; 282:1339-1361. [PMID: 34176156 DOI: 10.1002/jmor.21389] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 05/31/2021] [Accepted: 06/15/2021] [Indexed: 01/18/2023]
Abstract
The epiblast of the amniote embryo is of paramount importance during early development as it gives rise to all tissues of the embryo proper. In mammals, it emerges through segregation of the hypoblast from the inner cell mass and subsequently undergoes transformation into an epithelial sheet to create the embryonic disc. In rodents and man, the epiblast cell layer is covered by the polar trophoblast which forms the placenta. In mammalian model organisms (rabbit, pig, several non-human primates), however, the placenta is formed by mural trophoblast whereas the polar trophoblast disintegrates prior to gastrulation and thus exposes the epiblast to the microenvironment of the uterine cavity. Both, polar trophoblast disintegration and epiblast epithelialization, thus pose special cell-biological requirements but these are still rather ill-understood when compared to those of gastrulation morphogenesis. This study therefore applied high-resolution light and transmission electron microscopy and three-dimensional (3D) reconstruction to 8- to 10-days-old pig embryos and defines the following steps of epiblast transformation: (1) rosette formation in the center of the ball-shaped epiblast, (2) extracellular cavity formation in the rosette center, (3) epiblast segregation into two subpopulations - addressed here as dorsal and ventral epiblast - separated by a "pro-amniotic" cavity. Ventral epiblast cells form between them a special type of desmosomes with a characteristic dense felt of microfilaments and are destined to generate the definitive epiblast. The dorsal epiblast remains a mass of non-polarized cells and closely associates with the disintegrating polar trophoblast, which shows morphological features of both apoptosis and autophagocytosis. Morphogenesis of the definitive epiblast in the pig may thus exclude a large portion of bona fide epiblast cells from contributing to the embryo proper and establishes contact de novo with the mural trophoblast at the junction between the two newly defined epiblast cell populations.
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Affiliation(s)
- Braah Harmoush
- Institute of Anatomy and Embryology, University Medical Centre Göttingen, Göttingen, Germany
| | - Nikoloz Tsikolia
- Institute of Anatomy and Embryology, University Medical Centre Göttingen, Göttingen, Germany
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, University Medical Centre Göttingen, Göttingen, Germany
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8
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Alberio R, Kobayashi T, Surani MA. Conserved features of non-primate bilaminar disc embryos and the germline. Stem Cell Reports 2021; 16:1078-1092. [PMID: 33979595 PMCID: PMC8185373 DOI: 10.1016/j.stemcr.2021.03.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 03/11/2021] [Accepted: 03/12/2021] [Indexed: 12/12/2022] Open
Abstract
Post-implantation embryo development commences with a bilaminar disc in most mammals, including humans. Whereas access to early human embryos is limited and subject to greater ethical scrutiny, studies on non-primate embryos developing as bilaminar discs offer exceptional opportunities for advances in gastrulation, the germline, and the basis for evolutionary divergence applicable to human development. Here, we discuss the advantages of investigations in the pig embryo as an exemplar of development of a bilaminar disc embryo with relevance to early human development. Besides, the pig has the potential for the creation of humanized organs for xenotransplantation. Precise genetic engineering approaches, imaging, and single-cell analysis are cost effective and efficient, enabling research into some outstanding questions on human development and for developing authentic models of early human development with stem cells.
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Affiliation(s)
- Ramiro Alberio
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, UK.
| | - Toshihiro Kobayashi
- Center for Genetic Analysis of Behavior, National Institute for Physiological Sciences, Okazaki, Aichi 444-8787, Japan; The Graduate University of Advanced Studies, Okazaki, Aichi 444-8787, Japan
| | - M Azim Surani
- Wellcome Trust/Cancer Research UK Gurdon Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK; Department of Physiology, Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK; Wellcome Trust/Medical Research Council Stem Cell Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK.
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9
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Møgeltoft Kamstrup K, Markussen B, Hay‐Schmidt A, Thorup F, Dybdahl Thomsen P. Staging of porcine embryos: Comparison of Standard Event System‐based statistical clusters with a Carnegie‐based staging system. Dev Dyn 2020; 249:1259-1273. [DOI: 10.1002/dvdy.187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 02/23/2020] [Accepted: 03/12/2020] [Indexed: 11/08/2022] Open
Affiliation(s)
- Kristian Møgeltoft Kamstrup
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
| | - Bo Markussen
- Data Science Laboratory, Department of Mathematical Sciences, Faculty of Science University of Copenhagen Copenhagen Denmark
| | - Anders Hay‐Schmidt
- Department of Neuroscience and Pharmacology, Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
| | - Flemming Thorup
- Department of Livestock Innovation SEGES, Danish Agriculture & Food Council Copenhagen Denmark
| | - Preben Dybdahl Thomsen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences University of Copenhagen Copenhagen Denmark
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10
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Origin and function of the yolk sac in primate embryogenesis. Nat Commun 2020; 11:3760. [PMID: 32724077 PMCID: PMC7387521 DOI: 10.1038/s41467-020-17575-w] [Citation(s) in RCA: 87] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 06/29/2020] [Indexed: 12/13/2022] Open
Abstract
Human embryogenesis is hallmarked by two phases of yolk sac development. The primate hypoblast gives rise to a transient primary yolk sac, which is rapidly superseded by a secondary yolk sac during gastrulation. Moreover, primate embryos form extraembryonic mesoderm prior to gastrulation, in contrast to mouse. The function of the primary yolk sac and the origin of extraembryonic mesoderm remain unclear. Here, we hypothesise that the hypoblast-derived primary yolk sac serves as a source for early extraembryonic mesoderm, which is supplemented with mesoderm from the gastrulating embryo. We discuss the intricate relationship between the yolk sac and the primate embryo and highlight the pivotal role of the yolk sac as a multifunctional hub for haematopoiesis, germ cell development and nutritional supply.
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11
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Abstract
The polar trophoblast overlays the epiblast in eutherian mammals and, depending on the species, has one of two different fates. It either remains a single-layered, thinning epithelium called "Rauber's layer," which soon disintegrates, or, alternatively, it keeps proliferating, contributing heavily to the population of differentiating, invasive trophoblast cells and, at least in mice, to the induction of gastrulation. While loss of the persistent polar trophoblast in mice leads to reduced induction of gastrulation, we show here that prevention of the loss of the polar trophoblast in cattle results in ectopic domains of the gastrulation marker, BRACHYURY This phenotype, and increased epiblast proliferation, arose when Rauber's layer was maintained for a day longer by countering apoptosis through BCL2 overexpression. This suggests that the disappearance of Rauber's layer is a necessity, presumably to avoid excessive signaling interactions between this layer and the subjacent epiblast. We note that, in all species in which the polar trophoblast persists, including humans and mice, ectopic polar trophoblast signaling is prevented via epiblast cavitation which leads to the (pro)amniotic cavity, whose function is to distance the central epiblast from such signaling interactions.
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12
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Pieper T, Carpaij M, Reinermann J, Surchev L, Viebahn C, Tsikolia N. Matrix-filled microcavities in the emerging avian left-right organizer. Dev Dyn 2019; 249:496-508. [PMID: 31729123 DOI: 10.1002/dvdy.133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Revised: 10/18/2019] [Accepted: 10/18/2019] [Indexed: 01/14/2023] Open
Abstract
BACKGROUND Hensen node of the amniote embryo plays a central role in multiple developmental processes, especially in induction and formation of axial organs. In the chick, it is asymmetrical in shape and has recently been considered to represent the left-right organizer. As mechanisms of breaking the initial left-right symmetry of the embryo are still ill-understood, analyzing the node's microarchitecture may provide insights into functional links between symmetry breaking and asymmetric morphology. RESULTS In the course of a light- and electron-microscopic study addressing this issue we discovered novel intercellular matrix-filled cavities in the node of the chick during gastrulation and during early neurulation stages; measuring up to 45 μm, they are surrounded by densely packed cells and filled with nanoscale fibrils, which immunostaining suggests to consist of the basement membrane-related proteins fibronectin and perlecan. The cavities emerge immediately prior to node formation in the epiblast layer adjacent to the tip of the primitive streak and later, with emerging node asymmetry, they are predominantly located in the right part of the node. Almost identical morphological features of microcavities were found in the duck node. CONCLUSIONS We address these cavities as "nodal microcavities" and propose their content to be involved in the function of the avian node by mediating morphogen signaling and storage.
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Affiliation(s)
- Tobias Pieper
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Meriam Carpaij
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Johanna Reinermann
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Lachezar Surchev
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany.,Department of Anatomy, Trakia University Stara Zagora, Stara Zagora, Bulgaria
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Nikoloz Tsikolia
- Institute of Anatomy and Embryology, University Medical Center, Georg-August-Universität Göttingen, Göttingen, Germany
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13
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Hyttel P, de Figueiredo Pessôa LV, Secher JBM, Dittlau KS, Freude K, Hall VJ, Fair T, Assey RJ, Laurincik J, Callesen H, Greve T, Stroebech LB. Oocytes, embryos and pluripotent stem cells from a biomedical perspective. Anim Reprod 2019; 16:508-523. [PMID: 32435294 PMCID: PMC7234146 DOI: 10.21451/1984-3143-ar2019-0054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The veterinary and animal science professions are rapidly developing and their inherent and historical connection to agriculture is challenged by more biomedical and medical directions of research. While some consider this development as a risk of losing identity, it may also be seen as an opportunity for developing further and more sophisticated competences that may ultimately feed back to veterinary and animal science in a synergistic way. The present review describes how agriculture-related studies on bovine in vitro embryo production through studies of putative bovine and porcine embryonic stem cells led the way to more sophisticated studies of human induced pluripotent stem cells (iPSCs) using e.g. gene editing for modeling of neurodegeneration in man. However, instead of being a blind diversion from veterinary and animal science into medicine, these advanced studies of human iPSC-derived neurons build a set of competences that allowed us, in a more competent way, to focus on novel aspects of more veterinary and agricultural relevance in the form of porcine and canine iPSCs. These types of animal stem cells are of biomedical importance for modeling of iPSC-based therapy in man, but in particular the canine iPSCs are also important for understanding and modeling canine diseases, as e.g. canine cognitive dysfunction, for the benefit and therapy of dogs.
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Affiliation(s)
- Poul Hyttel
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | | | | | - Katarina Stoklund Dittlau
- KU Leuven - University of Leuven, Department of Neurosciences, Experimental Neurology, and Leuven Brain Institute (LBI), Leuven, Belgium.,VIB, Center for Brain & Disease Research, Laboratory of Neurobiology, Leuven, Belgium
| | - Kristine Freude
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Vanessa J Hall
- Department of Veterinary and Animal Sciences, University of Copenhagen, Denmark
| | - Trudee Fair
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland
| | - Remmy John Assey
- Department of Anatomy and Pathology, Sokoine University of Agriculture, Tanzania
| | - Jozef Laurincik
- Constantine the Philosopher University in Nitra, Nitra, Slovakia.,The Czech Academy of Sciences, Institute of Animal Physiology and Genetics, Liběchov, Czech Republic
| | - Henrik Callesen
- Department of Animal Science, Aarhus University, Tjele, Denmark
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14
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Sybirna A, Wong FCK, Surani MA. Genetic basis for primordial germ cells specification in mouse and human: Conserved and divergent roles of PRDM and SOX transcription factors. Curr Top Dev Biol 2019; 135:35-89. [PMID: 31155363 DOI: 10.1016/bs.ctdb.2019.04.004] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Primordial germ cells (PGCs) are embryonic precursors of sperm and egg that pass on genetic and epigenetic information from one generation to the next. In mammals, they are induced from a subset of cells in peri-implantation epiblast by BMP signaling from the surrounding tissues. PGCs then initiate a unique developmental program that involves comprehensive epigenetic resetting and repression of somatic genes. This is orchestrated by a set of signaling molecules and transcription factors that promote germ cell identity. Here we review significant findings on mammalian PGC biology, in particular, the genetic basis for PGC specification in mice and human, which has revealed an evolutionary divergence between the two species. We discuss the importance and potential basis for these differences and focus on several examples to illustrate the conserved and divergent roles of critical transcription factors in mouse and human germline.
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Affiliation(s)
- Anastasiya Sybirna
- Wellcome Trust Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge, United Kingdom; Physiology, Development and Neuroscience Department, University of Cambridge, Cambridge, United Kingdom; Wellcome Trust/Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom.
| | - Frederick C K Wong
- Wellcome Trust Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge, United Kingdom; Physiology, Development and Neuroscience Department, University of Cambridge, Cambridge, United Kingdom
| | - M Azim Surani
- Wellcome Trust Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge, United Kingdom; Physiology, Development and Neuroscience Department, University of Cambridge, Cambridge, United Kingdom; Wellcome Trust/Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Cambridge, United Kingdom.
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15
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Plöger R, Viebahn C. Pitx2 and nodal as conserved early markers of the anterior-posterior axis in the rabbit embryo. Ann Anat 2018; 218:256-264. [PMID: 29705588 DOI: 10.1016/j.aanat.2018.02.016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 10/17/2022]
Abstract
Attaining molecular and morphological axial polarity during gastrulation is a fundamental early requirement for normal development of the embryo. In mammals, the first morphological sign of the anterior-posterior axis appears anteriorly in the form of the anterior marginal crescent (or anterior visceral endoderm) while in the avian the first such sign is the Koller's sickle at the posterior pole of the embryonic disc. Despite this inverse mode of axis formation many genes and molecular pathways involved in various steps of this process seem to be evolutionarily conserved amongst amniotes, the nodal gene being a well-known example with its functional involvement prior and during gastrulation. The pitx2 gene, however, is a new candidate described in the chick as an early marker for anterior-posterior polarity and as a regulator of axis formation including twinning. To find out whether pitx2 has retained its inductive and early marker function during the evolution of mammals this study analyses pitx2 and nodal expression at parallel stages during formation of the anterior-posterior polarity in the early rabbit embryo using whole-mount in situ hybridization and serial light-microscopical sections. At a late pre-gastrulation stage a localized reduction of nodal expression presages the position of the anterior pole of the embryonic disc and thus serves as the earliest molecular marker of anterior-posterior polarity known so far. Pitx2 is expressed in a polarized manner in the anterior marginal crescent and in the posterior half of the embryonic disc during further development. In the anterior segment of the posterior pitx2 expression domain, the anterior streak domain (ASD) is defined by nodal expression as a hypothetical progenitor region of the anterior half of the primitive streak. The expression patterns of both genes thus serve as signs of a conserved involvement in early axis formation in amniotes and, possibly, in twinning in mammals as well.
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Affiliation(s)
- Ruben Plöger
- Institute of Anatomy and Embryology, Universitätsmedizin Göttingen, Germany
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, Universitätsmedizin Göttingen, Germany.
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Rodriguez AM, Jin DX, Wolfe AD, Mikedis MM, Wierenga L, Hashmi MP, Viebahn C, Downs KM. Brachyury drives formation of a distinct vascular branchpoint critical for fetal-placental arterial union in the mouse gastrula. Dev Biol 2017; 425:208-222. [PMID: 28389228 DOI: 10.1016/j.ydbio.2017.03.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Revised: 02/16/2017] [Accepted: 03/31/2017] [Indexed: 01/28/2023]
Abstract
How the fetal-placental arterial connection is made and positioned relative to the embryonic body axis, thereby ensuring efficient and directed blood flow to and from the mother during gestation, is not known. Here we use a combination of genetics, timed pharmacological inhibition in living mouse embryos, and three-dimensional modeling to link two novel architectural features that, at present, have no status in embryological atlases. The allantoic core domain (ACD) is the extraembryonic extension of the primitive streak into the allantois, or pre-umbilical tissue; the vessel of confluence (VOC), situated adjacent to the ACD, is an extraembryonic vessel that marks the site of fetal-placental arterial union. We show that genesis of the fetal-placental connection involves the ACD and VOC in a series of steps, each one dependent upon the last. In the first, Brachyury (T) ensures adequate extension of the primitive streak into the allantois, which in turn designates the allantoic-yolk sac junction. Next, the streak-derived ACD organizes allantoic angioblasts to the axial junction; upon signaling from Fibroblast Growth Factor Receptor-1 (FGFR1), these endothelialize and branch, forming a sprouting VOC that unites the umbilical and omphalomesenteric arteries with the fetal dorsal aortae. Arterial union is followed by the appearance of the medial umbilical roots within the VOC, which in turn designate the correct axial placement of the lateral umbilical roots/common iliac arteries. In addition, we show that the ACD and VOC are conserved across Placentalia, including humans, underscoring their fundamental importance in mammalian biology. We conclude that T is required for correct axial positioning of the VOC via the primitive streak/ACD, while FGFR1, through its role in endothelialization and branching, further patterns it. Together, these genetic, molecular and structural elements safeguard the fetus against adverse outcomes that can result from vascular mispatterning of the fetal-placental arterial connection.
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Affiliation(s)
- Adriana M Rodriguez
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Dexter X Jin
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Adam D Wolfe
- Department of Pediatrics, Division of Pediatric Hematology, Oncology & Bone Marrow Transplant, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Maria M Mikedis
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Lauren Wierenga
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Maleka P Hashmi
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, University Medical Center Göttingen, Göttingen, Germany
| | - Karen M Downs
- Department of Cell and Regenerative Biology, University of Wisconsin-Madison School of Medicine and Public Health, Madison, WI, USA.
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Stower MJ, Bertocchini F. The evolution of amniote gastrulation: the blastopore-primitive streak transition. WILEY INTERDISCIPLINARY REVIEWS-DEVELOPMENTAL BIOLOGY 2017; 6. [DOI: 10.1002/wdev.262] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 11/15/2016] [Accepted: 11/19/2016] [Indexed: 01/09/2023]
Affiliation(s)
- Matthew J. Stower
- Department of Physiology, Anatomy and Genetics; University of Oxford; Oxford UK
| | - Federica Bertocchini
- Department of Molecular and Cellular Signaling; Instituto de Biomedicina y Biotecnologia de Cantabria, CSIC-Universidad de Cantabria-Sodercan; Santander Spain
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18
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Hassan W, Viebahn C. A correlative study of the allantois in pig and rabbit highlighting the diversity of extraembryonic tissues in four mammalian species, including mouse and man. J Morphol 2017; 278:600-620. [PMID: 28165148 DOI: 10.1002/jmor.20657] [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: 07/18/2016] [Revised: 12/30/2016] [Accepted: 01/04/2017] [Indexed: 12/25/2022]
Abstract
Despite its conserved role in placenta and umbilical cord formation, the mammalian allantois shows remarkable diversity in size and form as well as in the timing of its appearance and attachment to the chorion. In the mouse, the common allantoic diverticulum is lacking; instead, the allantoic core domain is defined as a progenitor center for allantoic development. In this study, the allantoises of the pig and the rabbit as two nonrodent mammals of increasing significance in biomedical research are compared (1) morphologically using high resolution light and electron microscopy and (2) molecularly using brachyury mRNA expression as a mesodermal marker. Multiple small allantoic diverticula in the rabbit contrast with a single large cavity filling the entire allantois of the pig, but neither pig nor rabbit allantois expresses brachyury. The mesothelium on the allantois surface shows regional variability of cell contacts and microvilli, while blood vessels appear randomly around the allantoic diverticula in a mesodermal layer of variable thickness. Primordial germ cell-like cells are found in the allantois of the pig but not of the rabbit. To understand further the relevance of this developmental and morphological diversity, we compare the allantois development of pig and rabbit with early developmental landmarks of mouse and man. Our findings suggest that (1) tissue interaction between endoderm and mesoderm is important for allantoic development and vascular differentiation in species with a rudimentary allantoic diverticulum, (2) allantoic mesothelium plays a specific role in chorioallantoic attachment, allantoic differentiation and vascularization, and (3) there is a pronounced diversity in the extraembryonic migratory pathways of primordial germ cells among mammals. Finally, the phylogenetically basal characteristics of the pig allantois are suggestive of a functional similarity in mammals with a large allantois before placentation and in (aplacental) sauropsids with a chorioallantoic membrane well-adjusted to material exchange function.
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Affiliation(s)
- Waad Hassan
- Institute of Anatomy and Embryology, University Medical Center Göttingen, Göttingen, Germany
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, University Medical Center Göttingen, Göttingen, Germany
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19
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Conserved and divergent expression patterns of markers of axial development in the laboratory opossum,Monodelphis domestica. Dev Dyn 2016; 245:1176-1188. [DOI: 10.1002/dvdy.24459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 09/14/2016] [Accepted: 09/14/2016] [Indexed: 11/07/2022] Open
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Yoshida M, Kajikawa E, Kurokawa D, Noro M, Iwai T, Yonemura S, Kobayashi K, Kiyonari H, Aizawa S. Conserved and divergent expression patterns of markers of axial development in reptilian embryos: Chinese soft-shell turtle and Madagascar ground gecko. Dev Biol 2016; 415:122-142. [DOI: 10.1016/j.ydbio.2016.05.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Revised: 05/06/2016] [Accepted: 05/06/2016] [Indexed: 12/18/2022]
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Hue I. Determinant molecular markers for peri-gastrulating bovine embryo development. Reprod Fertil Dev 2016; 28:51-65. [DOI: 10.1071/rd15355] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Peri-gastrulation defines the time frame between blastocyst formation and implantation that also corresponds in cattle to elongation, pregnancy recognition and uterine secretion. Optimally, this developmental window prepares the conceptus for implantation, placenta formation and fetal development. However, this is a highly sensitive period, as evidenced by the incidence of embryo loss or early post-implantation mortality after AI, embryo transfer or somatic cell nuclear transfer. Elongation markers have often been used within this time frame to assess developmental defects or delays, originating either from the embryo, the uterus or the dam. Comparatively, gastrulation markers have not received great attention, although elongation and gastrulation are linked by reciprocal interactions at the molecular and cellular levels. To make this clearer, this peri-gastrulating period is described herein with a focus on its main developmental landmarks, and the resilience of the landmarks in the face of biotechnologies is questioned.
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Yoshida M, Kajikawa E, Kurokawa D, Tokunaga T, Onishi A, Yonemura S, Kobayashi K, Kiyonari H, Aizawa S. Conserved and divergent expression patterns of markers of axial development in eutherian mammals. Dev Dyn 2015; 245:67-86. [PMID: 26404161 DOI: 10.1002/dvdy.24352] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Revised: 09/12/2015] [Accepted: 09/12/2015] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND Mouse embryos are cup shaped, but most nonrodent eutherian embryos are disk shaped. Extraembryonic ectoderm (ExEc), which may have essential roles in anterior-posterior (A-P) axis formation in mouse embryos, does not develop in many eutherian embryos. To assess A-P axis formation in eutherians, comparative analyses were made on rabbit, porcine, and Suncus embryos. RESULTS All embryos examined expressed Nodal initially throughout epiblast and visceral endoderm; its expression became restricted to the posterior region before gastrulation. Anterior visceral endoderm (AVE) genes were expressed in Otx2-positive visceral endoderm, with Dkk1 expression being most anterior. The mouse pattern of AVE formation was conserved in rabbit embryos, but had diverged in porcine and Suncus embryos. No structure that was molecularly equivalent to Bmp-positive ExEc, existed in rabbit or pig embryos. In Suncus embryos, A-P axis was determined at prehatching stage, and these embryos attached to uterine wall at future posterior side. CONCLUSIONS Nodal, but not Bmp, functions in epiblast and visceral endoderm development may be conserved in eutherians. AVE functions may also be conserved, but the pattern of its formation has diverged among eutherians. Roles of BMP and NODAL gradients in AVE formation seem to have been established in a subset of rodents.
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Affiliation(s)
- Michio Yoshida
- Laboratory for Vertebrate Body Plan, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan
| | - Eriko Kajikawa
- Laboratory for Vertebrate Body Plan, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan
| | - Daisuke Kurokawa
- Laboratory for Vertebrate Body Plan, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan.,Misaki Marine Biological Station, Graduate School of Science, The University of Tokyo, Misaki, Miura, Kanagawa, Japan
| | - Tomoyuki Tokunaga
- Animal Development and Differentiation Research Unit, Animal Research Division, National Institute of Agrobiological Sciences (NIAS), Tsukuba-shi, Ibaraki, Japan
| | - Akira Onishi
- Laboratory of Animal Reproduction, Department of Animal Science and Resources, Nihon University College of Bioresource Sciences, Fujisawa, Kanagawa, Japan
| | - Shigenobu Yonemura
- Ultrastructural Research Team, Biosystem Dynamics Group, Division of Bio-function Dynamics Imaging, RIKEN Center for Life Science Technologies (CLST), Chuo-ku, Kobe, Japan
| | - Kensaku Kobayashi
- Laboratory for Animal Resources and Genetic Engineering, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan
| | - Hiroshi Kiyonari
- Laboratory for Animal Resources and Genetic Engineering, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan
| | - Shinichi Aizawa
- Laboratory for Vertebrate Body Plan, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan.,Laboratory for Animal Resources and Genetic Engineering, Center for Developmental Biology (CDB), RIKEN Kobe, Chuo-ku, Kobe, Japan
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van Leeuwen J, Berg DK, Pfeffer PL. Morphological and Gene Expression Changes in Cattle Embryos from Hatched Blastocyst to Early Gastrulation Stages after Transfer of In Vitro Produced Embryos. PLoS One 2015; 10:e0129787. [PMID: 26076128 PMCID: PMC4468082 DOI: 10.1371/journal.pone.0129787] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Accepted: 05/13/2015] [Indexed: 11/19/2022] Open
Abstract
A detailed morphological staging system for cattle embryos at stages following blastocyst hatching and preceding gastrulation is presented here together with spatiotemporal mapping of gene expression for BMP4, BRACHYURY, CERBERUS1 (CER1), CRIPTO, EOMESODERMIN, FURIN and NODAL. Five stages are defined based on distinct developmental events. The first of these is the differentiation of the visceral hypoblast underlying the epiblast, from the parietal hypoblast underlying the mural trophoblast. The second concerns the formation of an asymmetrically positioned, morphologically recognisable region within the visceral hypoblast that is marked by the presence of CER1 and absence of BMP4 expression. We have termed this the anterior visceral hypoblast or AVH. Intra-epiblast cavity formation and the disappearance of the polar trophoblast overlying the epiblast (Rauber’s layer) have been mapped in relation to AVH formation. The third chronological event involves the transition of the epiblast into the embryonic ectoderm with concomitant onset of posterior NODAL, EOMES and BRACHYURY expression. Lastly, gastrulation commences as the posterior medial embryonic ectoderm layer thickens to form the primitive streak and cells ingress between the embryonic ectoderm and hypoblast. At this stage a novel domain of CER1 expression is seen whereas the AVH disappears. Comparison with the mouse reveals that while gene expression patterns at the onset of gastrulation are well conserved, asymmetry establishment, which relies on extraembryonic tissues such as the hypoblast and trophoblast, has diverged in terms of both gene expression and morphology.
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Affiliation(s)
- Jessica van Leeuwen
- AgResearch Ruakura, Animal Productivity Section, Hamilton, New Zealand
- Department of Biological Sciences, University of Waikato, Hamilton, New Zealand
| | - Debra K. Berg
- AgResearch Ruakura, Animal Productivity Section, Hamilton, New Zealand
| | - Peter L. Pfeffer
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
- * E-mail:
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Hue I, Evain-Brion D, Fournier T, Degrelle SA. Primary Bovine Extra-Embryonic Cultured Cells: A New Resource for the Study of In Vivo Peri-Implanting Phenotypes and Mesoderm Formation. PLoS One 2015; 10:e0127330. [PMID: 26070137 PMCID: PMC4466545 DOI: 10.1371/journal.pone.0127330] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 04/13/2015] [Indexed: 01/11/2023] Open
Abstract
In addition to nourishing the embryo, extra-embryonic tissues (EETs) contribute to early embryonic patterning, primitive hematopoiesis, and fetal health. These tissues are of major importance for human medicine, as well as for efforts to improve livestock efficiency, but they remain incompletely understood. In bovines, EETs are accessible easily, in large amounts, and prior to implantation. We took advantage of this system to describe, in vitro and in vivo, the cell types present in bovine EETs at Day 18 of development. Specifically, we characterized the gene expression patterns and phenotypes of bovine extra-embryonic ectoderm (or trophoblast; bTC), endoderm (bXEC), and mesoderm (bXMC) cells in culture and compared them to their respective in vivo micro-dissected cells. After a week of culture, certain characteristics (e.g., gene expression) of the in vitro cells were altered with respect to the in vivo cells, but we were able to identify "cores" of cell-type-specific (and substrate-independent) genes that were shared between in vitro and in vivo samples. In addition, many cellular phenotypes were cell-type-specific with regard to extracellular adhesion. We evaluated the ability of individual bXMCs to migrate and spread on micro-patterns, and observed that they easily adapted to diverse environments, similar to in vivo EE mesoderm cells, which encounter different EE epithelia to form chorion, yolk sac, and allantois. With these tissue interactions, different functions arose that were detected in silico and corroborated in vivo at D21-D25. Moreover, analysis of bXMCs allowed us to identify the EE cell ring surrounding the embryonic disc (ED) at D14-15 as mesoderm cells, which had been hypothesized but not shown prior to this study. We envision these data will serve as a major resource for the future in the analysis of peri-implanting phenotypes in response to the maternal metabolism and contribute to subsequent studies of placental/fetal development in eutherians.
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Affiliation(s)
- Isabelle Hue
- INRA, UMR1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France
| | - Danièle Evain-Brion
- INSERM, UMR-S1139, U767, Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France; PremUp Foundation, Paris, France
| | - Thierry Fournier
- INSERM, UMR-S1139, U767, Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Séverine A Degrelle
- INRA, UMR1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France; INSERM, UMR-S1139, U767, Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France; PremUp Foundation, Paris, France
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Stankova V, Tsikolia N, Viebahn C. Rho kinase activity controls directional cell movements during primitive streak formation in the rabbit embryo. Development 2015; 142:92-8. [PMID: 25516971 PMCID: PMC4299133 DOI: 10.1242/dev.111583] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
During animal gastrulation, the specification of the embryonic axes is accompanied by epithelio-mesenchymal transition (EMT), the first major change in cell shape after fertilization. EMT takes place in disparate topographical arrangements, such as the circular blastopore of amphibians, the straight primitive streak of birds and mammals or in intermediate gastrulation forms of other amniotes such as reptiles. Planar cell movements are prime candidates to arrange specific modes of gastrulation but there is no consensus view on their role in different vertebrate classes. Here, we test the impact of interfering with Rho kinase-mediated cell movements on gastrulation topography in blastocysts of the rabbit, which has a flat embryonic disc typical for most mammals. Time-lapse video microscopy, electron microscopy, gene expression and morphometric analyses of the effect of inhibiting ROCK activity showed – besides normal specification of the organizer region – a dose-dependent disruption of primitive streak formation; this disruption resulted in circular, arc-shaped or intermediate forms, reminiscent of those found in amphibians, fishes and reptiles. Our results reveal a crucial role of ROCK-controlled directional cell movements during rabbit primitive streak formation and highlight the possibility that temporal and spatial modulation of cell movements were instrumental for the evolution of gastrulation forms. Summary: ROCK regulates cell motility, polarisation, intercalation and division in gastrulating rabbit embryos, revealing a role for Wnt-PCP signalling in primitive streak formation.
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Affiliation(s)
- Viktoria Stankova
- Institute of Anatomy and Embryology, University Medical Centre, Georg August University of Göttingen, Göttingen 37079, Germany
| | - Nikoloz Tsikolia
- Institute of Anatomy and Embryology, University Medical Centre, Georg August University of Göttingen, Göttingen 37079, Germany
| | - Christoph Viebahn
- Institute of Anatomy and Embryology, University Medical Centre, Georg August University of Göttingen, Göttingen 37079, Germany
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Püschel B, Jouneau A. Whole-mount in situ hybridization to assess advancement of development and embryo morphology. Methods Mol Biol 2015; 1222:255-265. [PMID: 25287352 DOI: 10.1007/978-1-4939-1594-1_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Whole-mount in situ hybridization (WISH) is widely used to visualize the site and dynamics of gene expression during embryonic development. Various methods of probe labeling and hybridization detection are available nowadays. Meanwhile the technique was adapted to be used on many different species and has evolved from a manual to a larger scale and automated procedure. Standardized automated protocols improve the chance to compare different experimental settings reliably. The high resolution of this method is ideally suited for examination of manipulated (e.g., cloned) embryos often displaying subtle changes only. Embedding and sectioning of in situ hybridized specimen further enhance the detailed examination of their gene expression and morphology.
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Affiliation(s)
- Bernd Püschel
- Department of Anatomy and Embryology, Center of Anatomy, University Medical Center, University of Göttingen, Kreuzbergring 36, Göttingen, D-37075, Germany,
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Richard C, Hue I, Gelin V, Neveux A, Campion E, Degrelle SA, Heyman Y, Chavatte-Palmer P. Transcervical collection of bovine embryos up to Day 21: an 8-year overview. Theriogenology 2014; 83:1101-9. [PMID: 25662200 DOI: 10.1016/j.theriogenology.2014.12.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Revised: 11/27/2014] [Accepted: 12/02/2014] [Indexed: 12/12/2022]
Abstract
Transcervical embryo collection is used routinely in the bovine species throughout the world to collect Day 6 to Day 9 embryos (early embryos) for genetic selection. For research purposes, however, the collection of embryos at later stages of pregnancy, i.e., Days 12 to 21 (late embryos), is needed. So far, for the recovery of late embryos, females are euthanized and embryo collection is performed after recovery of the genital tract. To reduce the number of animals used and still provide valuable material for embryo research, we have therefore developed a transcervical technique to collect late embryos. The objective of this study was to compare embryo recovery results at early and late stages within our laboratory. Altogether, 232 cows were used for this study. One hundred forty-five flushes were performed to collect embryos from Days 6 to 9, and 251 flushes were performed to collect embryos from Days 12 to 21. For the early embryos, a classical three-way collection equipment was used. To collect the late embryos, the same equipment was used, but the extensible flexible catheter that goes inside the external rigid catheter was removed, so that larger embryos could be collected through the remaining larger hole (two-way collection). All females were submitted to ovum pick up to remove the dominant follicle and were subsequently superovulated with FSH. Luteolysis was induced 48 hours before artificial insemination. Two artificial inseminations were performed with frozen semen, 48 and 56 hours after PGF2α injection. Before embryo collection, cows were treated with an epidural injection of a local anesthetic drug. The presence of CL was checked, and they were counted by rectal palpation. For all collections, the cervix was prepared with the initial introduction of a dilator. Then, the catheter was introduced in one horn, and the cuff was inflated as low as possible. For the collection of late embryos, the flushing solution (30 mL) was injected slowly twice to suspend the embryos before flushing the horn with 500 mL, and the same operation was performed on the second horn. There was no significant difference in the number of embryos collected per flush in the early- and late-stage (758 embryos collected, 5.22 ± 6.02 per flush vs. 1238 embryos collected, 4.93 ± 5.07 per flush, respectively). The number of embryos collected per CL, however, was significantly lower in the early versus late group (0.39 ± 0.32% vs. 0.44 ± 0.34%, respectively). The late collection allowed the retrieval of full conceptuses (embryonic and extraembryonic tissues), even at very late stages such as Days 18 to 21. Careful collection is needed, however, so that conceptuses are not damaged or torn: the horn must be massaged gently and the flush should be ideally recovered in one single flow. This technique is a powerful tool to collect the late-stage embryos for research purposes. Because it is not traumatic, animals can be used again for the same procedure.
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Affiliation(s)
- C Richard
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France; ENVA, UMR 1198 Biologie du Développement et Reproduction, Maisons-Alfort, France.
| | - I Hue
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France; ENVA, UMR 1198 Biologie du Développement et Reproduction, Maisons-Alfort, France
| | - V Gelin
- INRA, UCEA Bressonvilliers, Leudeville, France
| | - A Neveux
- INRA, UCEA Bressonvilliers, Leudeville, France
| | - E Campion
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France
| | - S A Degrelle
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France; INSERM, UMR-S1139767, Faculté des Sciences Pharmaceutiques et Biologiques, Paris, France; Université Paris Descartes, Sorbonne Paris Cité, Paris, France
| | - Y Heyman
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France
| | - P Chavatte-Palmer
- INRA, UMR 1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France; ENVA, UMR 1198 Biologie du Développement et Reproduction, Maisons-Alfort, France
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Otto A, Pieper T, Viebahn C, Tsikolia N. Early left-right asymmetries during axial morphogenesis in the chick embryo. Genesis 2014; 52:614-25. [PMID: 24648137 DOI: 10.1002/dvg.22773] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Revised: 03/08/2014] [Accepted: 03/17/2014] [Indexed: 11/07/2022]
Abstract
The primitive node is the "hub" of early left-right patterning in the chick embryo: (1) it undergoes asymmetrical morphogenesis immediately after its appearance at Stage 4; (2) it is closely linked to the emerging asymmetrical expression of nodal and shh at Stage 5; and (3) its asymmetry is spatiotemporally related to the emerging notochord, the midline barrier maintaining molecular left-right patterning from Stage 6 onward. Here, we study the correlation of node asymmetry to notochord marker expression using high-resolution histology, and we test pharmacological inhibition of shh signaling using cyclopamine at Stages 4 and 5. Just as noggin expression mirrors an intriguing structural continuity between the right node shoulder and the notochord, shh expression in the left node shoulder confirms a similar continuity with the future floor plate. Shh inhibition at Stage 4 or 5 suppressed nodal in both its paraxial or lateral plate mesoderm domains, respectively, and resulted in randomized heart looping. Thus, the "primordial" paraxial nodal asymmetry at Stage 4/5 (1) appears to be dependent on, but not instructed by, shh signaling and (2) may be fixed by asymmetrical roots of the notochord and the floor plate, thereby adding further twists to the node's pivotal role during left-right patterning.
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Affiliation(s)
- Annalena Otto
- Anatomy and Embryology, University of Göttingen, Kreuzbergring 36, Göttingen, Germany
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29
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Sheng G. Day-1 chick development. Dev Dyn 2013; 243:357-67. [DOI: 10.1002/dvdy.24087] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 10/22/2013] [Accepted: 10/22/2013] [Indexed: 02/04/2023] Open
Affiliation(s)
- Guojun Sheng
- Laboratory for Early Embryogenesis; RIKEN Center for Developmental Biology; Kobe Hyogo Japan
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30
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Morphological changes and germ layer formation in the porcine embryos from days 7-13 of development. ZYGOTE 2013; 23:266-76. [PMID: 24229742 DOI: 10.1017/s0967199413000531] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Morphogenesis and identification of embryonic differentiation in porcine embryos are crucial issues for developmental biology and laboratory animal science. The current paper presents a study on the asynchronous development of hatched porcine embryos from days 7 to 13 post-insemination. Examination of semi-thin sections of the hypoblast showed that it had characteristics similar to those of the mouse anterior visceral endoderm during embryonic disc formation. Also, a cavity appeared in the epiblast, which was similar to a mouse proamniotic cavity. With the gradual disappearance of Rauber's layer, the cavity opened and contacted the external environment directly, all of which formed the embryonic disc. To confirm the differentiation characteristics, we performed immunohistochemical analyses and showed that GATA6 was detected clearly in parietal endoderm cells during embryonic disc establishment. OCT4 was expressed in the inner cell mass (ICM) and trophoblast of hatched blastocysts and in the epiblast during formation of the embryonic disc. However, OCT4 showed comparatively decreased expression in the posterior embryonic disc, primitive streak and migrating cells. SOX2 was present in the ICM and epiblast. Therefore, both SOX2 and OCT4 can be used as markers of pluripotent cells in the porcine embryonic disc. At the start of gastrulation, staining revealed VIMENTIN in the posterior of the embryonic disc, primitive streak and in migrating cells that underlay the embryonic disc and was also expressed in epiblast cells located in the anterior primitive streak. Together with serial sections of embryos stained by whole mount immunohistochemistry, the mesoderm differentiation pattern was shown as an ingression movement that took place at the posterior of the embryonic disc and with bilateral migration along the embryonic disc borders.
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Alev C, Wu Y, Nakaya Y, Sheng G. Decoupling of amniote gastrulation and streak formation reveals a morphogenetic unity in vertebrate mesoderm induction. Development 2013; 140:2691-6. [PMID: 23698348 DOI: 10.1242/dev.094318] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Mesoderm is formed during gastrulation. This process takes place at the blastopore in lower vertebrates and in the primitive streak (streak) in amniotes. The evolutionary relationship between the blastopore and the streak is unresolved, and the morphogenetic and molecular changes leading to this shift in mesoderm formation during early amniote evolution are not well understood. Using the chick model, we present evidence that the streak is dispensable for mesoderm formation in amniotes. An anamniote-like circumblastoporal mode of gastrulation can be induced in chick and three other amniote species. The induction requires cooperative activation of the FGF and Wnt pathways, and the induced mesoderm field retains anamniote-like dorsoventral patterning. We propose that the amniote streak is homologous to the blastopore in lower vertebrates and evolved from the latter in two distinct steps: an initial pan-amniote posterior restriction of mesoderm-inducing signals; and a subsequent lineage-specific morphogenetic modification of the pre-ingression epiblast.
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Affiliation(s)
- Cantas Alev
- Laboratory for Early Embryogenesis, RIKEN Center for Developmental Biology, 2-2-3 Minatojima-minamimachi, Chuo-Ku, Kobe, Hyogo 650-0047, Japan
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Bertocchini F, Stern CD. Gata2 provides an early anterior bias and uncovers a global positioning system for polarity in the amniote embryo. Development 2013; 139:4232-8. [PMID: 23093427 DOI: 10.1242/dev.081901] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The first axis to be specified during vertebrate development is that between the site where gastrulation will begin and the opposite pole of the embryo (dorsoventral axis in amphibians and fish, anteroposterior in amniotes). This relies on Nodal activity, but different vertebrates differ in how this activity is positioned. In chick, the earliest known asymmetry is posterior expression of the TGFβ-related factor Vg1, close to the future Nodal expression domain. Here we show that the transcription factor Gata2 is expressed anteriorly before this stage. Gata2 influences the site of primitive streak formation and its role is independent from, and upstream of, Vg1 and Wnt. However, although Vg1 is required for streak formation, Gata2 does not act as an absolute anterior specifier, but provides an anterior bias. These findings point to previously unsuspected global determinants of polarity of the early amniote embryo.
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Affiliation(s)
- Federica Bertocchini
- Department of Cell and Developmental Biology, University College London, Gower Street, London, UK.
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33
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Hue I, Degrelle SA, Viebahn C. Analysis of molecular markers for staging peri-gastrulating bovine embryos. Methods Mol Biol 2013; 1074:125-35. [PMID: 23975810 DOI: 10.1007/978-1-62703-628-3_10] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Whole-mount in situ hybridization (WISH) is a method to visualize gene expression through hybridization of in vitro synthesized riboprobes to cellular mRNAs. WISH has been used in developmental biology for decades and was adapted to many species, especially for model organisms of developmental biology. The method has evolved, from analyzing small embryo batches to large-scale gene expression screenings, using: (1) manual or automated protocols, (2) colorimetric or fluorescent detection of the hybridized riboprobes, and (3) individual or systemic image acquisition and storage. As for bovine embryo staging, the in situ hybridization of whole embryonic discs has both proved useful and efficient, provided that a few improvements were brought to the in vitro riboprobe synthesis.
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Affiliation(s)
- Isabelle Hue
- UMR Biologie du Développement et Reproduction, INRA, Jouy-en-Josas, France
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34
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Hue I, Degrelle SA, Turenne N. Conceptus elongation in cattle: Genes, models and questions. Anim Reprod Sci 2012; 134:19-28. [DOI: 10.1016/j.anireprosci.2012.08.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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35
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Characterization and expressional analysis of Dleu7 during Xenopus tropicalis embryogenesis. Gene 2012; 509:77-84. [PMID: 22939871 DOI: 10.1016/j.gene.2012.08.024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Revised: 08/06/2012] [Accepted: 08/15/2012] [Indexed: 02/07/2023]
Abstract
We characterized the genomic structure and developmental expression of the Dleu7 (deleted in lymphocytic leukemia, 7) gene in Xenopus tropicalis and the evolution of the gene across species. Within the protein-coding sequence (CDS) region, X. tropicalis Dleu7 consists of two exons and one intron. However, bioinformatic analysis indicates that this 211-amino-acid protein contains no obvious functional domains or known motifs. Reverse-transcription polymerase chain reaction and whole-mount in situ hybridization results revealed that, in addition to its expression in the blood island region, some regions of the central nervous system, and subdomains of the neural tube, X. tropicalis Dleu7 is zygotically expressed primarily in mesoderm tissues such as notochord and muscles during early embryogenesis. Expression in notochord is consistent with results from genome-wide association studies suggesting that DLEU7 is related to human adult height. Expression in the blood island region, where blood cell precursors (including B cells) are generated, implies a potential conserved role for Dleu7 in B-cell development between amphibians and mammals. Expression of Dleu7 in some regions of the central nervous system and subdomains of the neural tube also suggests other functions in development. Phylogenetic analysis indicated that Dleu7 is a vertebrate-specific gene and undergoes strong selective pressure in lower vertebrates but is functionally constrained in higher mammals. When subcellular localization was examined by overexpression of enhanced green fluorescent protein fusion protein, Dleu7 showed centrosome localization with main distribution in cytoplasm. Treating gastrula embryos with SU5402, a small molecular inhibitor of the fibroblast growth factor (FGF) receptor, confirmed that Dleu7 expression in mesoderm is regulated by FGF signaling. Our data provide important clues for pathogenesis and physiology during development from the perspective of evolutionary conservation.
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Maruotti J, Muñoz M, Degrelle SA, Gómez E, Louet C, Díez C, Monforte CD, de Longchamp PH, Brochard V, Hue I, Caamaño JN, Jouneau A. Efficient derivation of bovine embryonic stem cells needs more than active core pluripotency factors. Mol Reprod Dev 2012; 79:461-77. [PMID: 22573702 DOI: 10.1002/mrd.22051] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Accepted: 05/01/2012] [Indexed: 12/20/2022]
Abstract
Pluripotency can be captured in vitro, providing that the culture environment meets the requirements that avoid differentiation while stimulating self-renewal. From studies in the mouse embryo, two kinds of pluripotent stem cells have been obtained from the early and late epiblast, embryonic stem cells (ESCs) and epiblast stem cells (EpiSCs), representing the naive and primed states, respectively. All attempts to derive convincing ESCs in ungulates have been unsuccessful, although all attempts were based on the assumption that the conditions used to derive mouse ESCs or human ESC could be applied in other species. Pluripotent cells derived in primates, rabbit, and pig strongly indicate that the state of pluripotency of these cells is, in fact, closer to EpiSCs than to ESCs, and thus depend on fibroblast growth factor (FGF) and Activin signaling pathways. Based on this observation, we have tried to derive EpiSC from the epiblast of bovine elongated embryos as well as ESCs from Day-8 blastocysts. We here show that the core transcription factors Oct4/Sox2/Nanog can be used as markers of pluripotency in the bovine since their expression was restricted to the developing epiblast after Day 8, and disappeared following differentiation of both the ESC-like and EpiSC-like cultures. Although FGF and Activin pathways are indeed present and active in the bovine, it is not sufficient/enough to maintain a long-term pluripotency ex vivo, as was reported for mouse and pig EpiSCs.
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Affiliation(s)
- Julien Maruotti
- INRA, UMR1198 Biologie du Développement et Reproduction, Jouy-en-Josas, France
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Abstract
When amniotes appeared during evolution, embryos freed themselves from intracellular nutrition; development slowed, the mid-blastula transition was lost and maternal components became less important for polarity. Extra-embryonic tissues emerged to provide nutrition and other innovations. One such tissue, the hypoblast (visceral endoderm in mouse), acquired a role in fixing the body plan: it controls epiblast cell movements leading to primitive streak formation, generating bilateral symmetry. It also transiently induces expression of pre-neural markers in the epiblast, which also contributes to delay streak formation. After gastrulation, the hypoblast might protect prospective forebrain cells from caudalizing signals. These functions separate mesendodermal and neuroectodermal domains by protecting cells against being caught up in the movements of gastrulation.
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Affiliation(s)
- Claudio D Stern
- Department of Cell and Developmental Biology, University College London, GowerStreet (Anatomy Building), London WC1E 6BT, UK.
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38
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Halacheva V, Fuchs M, Dönitz J, Reupke T, Püschel B, Viebahn C. Planar cell movements and oriented cell division during early primitive streak formation in the mammalian embryo. Dev Dyn 2011; 240:1905-16. [DOI: 10.1002/dvdy.22687] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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39
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Xia P, Liu Z, Qin P. Fine Structures of Embryonic Discs of In Vivo Post-hatching Porcine Blastocysts at the Pre-Primitive Streak Stage. Reprod Domest Anim 2011; 46:366-72. [DOI: 10.1111/j.1439-0531.2010.01638.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Wolf XA, Serup P, Hyttel P. Three-dimensional immunohistochemical characterization of lineage commitment by localization of T and FOXA2 in porcine peri-implantation embryos. Dev Dyn 2011; 240:890-7. [DOI: 10.1002/dvdy.22602] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2011] [Indexed: 01/06/2023] Open
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41
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Blomberg LA, Schreier L, Li RW. Characteristics of peri-implantation porcine concepti population and maternal milieu influence the transcriptome profile. Mol Reprod Dev 2011; 77:978-89. [PMID: 21104768 DOI: 10.1002/mrd.21253] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Asynchrony of trophectoderm elongation, gestational days 11-12, is evident in porcine concepti, and rapid progression through this phase has been associated with conceptus competency. The goal of the current study was to determine the extent of transcriptomic responses of concepti to developmental delay and their physiological implications. Gestational day 11 concepti with the same morphology, ovoid and 7-8 mm, were isolated and designated as control or developmentally delayed if collected from a homogenous ovoid conceptus population or heterogeneous conceptus population (ovoid to filamentous), respectively. Total RNA prepared from four distinct control and four distinct developmentally delayed concepti, was analyzed using an Agilent high-density custom porcine microarray. Two hundred nine transcripts were found differentially expressed between normal and developmentally delayed concepti. Functional analysis of these genes indicated that a significant number of the genes regulate signal transduction/transcription, organismal development, metabolism, and cell adhesion and can be modulated by transforming growth factor β1 (TGFβ1). Ten genes were selected for real-time PCR validation of differential expression based on a known role in steroid synthesis, endometrium receptivity, and modulation of trophoblast differentiation/growth or interaction with TGFβ1. As in the microarray, all except one, achaete-scute complex homolog 2, were preferentially up-regulated in delayed concepti. Overall, findings suggested that despite similar morphology, the transcriptome of developmentally delayed concepti is distinct from control counterparts. Also highlighted were ways by which the conceptus' microenvironment might be affected and developmental factors that may be of interest to interrogate further to determine if, and how, they affect embryo competency/elongation.
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42
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Hall VJ, Jacobsen JV, Rasmussen MA, Hyttel P. Ultrastructural and molecular distinctions between the porcine inner cell mass and epiblast reveal unique pluripotent cell states. Dev Dyn 2011; 239:2911-20. [PMID: 20865782 DOI: 10.1002/dvdy.22424] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Characterization of the pluripotent cell populations within the porcine embryo is essential for understanding pluripotency and self-renewal regulation in the inner cell mass (ICM) and epiblast. In this study, we perform detailed ultrastructural and molecular characterization of the developing pluripotent cell population as it develops from the ICM to the late epiblast. The ultrastructural observations revealed that the outer cells of the ICM have a high nuclear:cytoplasmic ratio but are transcriptionally inactive and contain mitochondria with few cristae. In contrast, the epiblast cells have a reduced nuclear:cytoplasmic ratio, are more transcriptionally active, and contain abundant cellular organelles. This study also revealed cavitation and potential unfolding of the epiblast. As the ICM forms the epiblast, SSEA1 is lost and VIMENTIN is lost and re-expressed. The D6 blastocyst expressed high levels of STELLA, TERF1, and GDF3, and the epiblast expressed epithelial markers, MUC1 and E-CADHERIN, and the pluripotency markers, DNMT3B and CRIPTO.
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Affiliation(s)
- Vanessa J Hall
- Department of Basic Animal and Veterinary Sciences, Faculty of LIFE Sciences, University of Copenhagen, Copenhagen, Denmark.
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43
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Wolf XA, Serup P, Hyttel P. Three-dimensional localisation of NANOG, OCT4, and E-cadherin in porcine pre- and peri-implantation embryos. Dev Dyn 2010; 240:204-10. [DOI: 10.1002/dvdy.22491] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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44
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Degrelle SA, Lê Cao KA, Heyman Y, Everts RE, Campion E, Richard C, Ducroix-Crépy C, Tian XC, Lewin HA, Renard JP, Robert-Granié C, Hue I. A small set of extra-embryonic genes defines a new landmark for bovine embryo staging. Reproduction 2010; 141:79-89. [PMID: 20926692 DOI: 10.1530/rep-10-0174] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Axis specification in mouse is determined by a sequence of reciprocal interactions between embryonic and extra-embryonic tissues so that a few extra-embryonic genes appear as 'patterning' the embryo. Considering these interactions as essential, but lacking in most mammals the genetically driven approaches used in mouse and the corresponding patterning mutants, we examined whether a molecular signature originating from extra-embryonic tissues could relate to the developmental stage of the embryo proper and predict it. To this end, we have profiled bovine extra-embryonic tissues at peri-implantation stages, when gastrulation and early neurulation occur, and analysed the subsequent expression profiles through the use of predictive methods as previously reported for tumour classification. A set of six genes (CALM1, CPA3, CITED1, DLD, HNRNPDL, and TGFB3), half of which had not been previously associated with any extra-embryonic feature, appeared significantly discriminative and mainly dependent on embryonic tissues for its faithful expression. The predictive value of this set of genes for gastrulation and early neurulation stages, as assessed on naive samples, was remarkably high (93%). In silico connected to the bovine orthologues of the mouse patterning genes, this gene set is proposed as a new trait for embryo staging. As such, this will allow saving the bovine embryo proper for molecular or cellular studies. To us, it offers as well new perspectives for developmental phenotyping and modelling of embryonic/extra-embryonic co-differentiation.
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Affiliation(s)
- Séverine A Degrelle
- INRA-ENVA, UMR 1198 Biologie du Développement et Reproduction, Domaine de Vilvert, Jouy en Josas, France
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45
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Hassoun R, Schwartz P, Rath D, Viebahn C, Männer J. Germ layer differentiation during early hindgut and cloaca formation in rabbit and pig embryos. J Anat 2010; 217:665-78. [PMID: 20874819 DOI: 10.1111/j.1469-7580.2010.01303.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Relative to recent advances in understanding molecular requirements for endoderm differentiation, the dynamics of germ layer morphology and the topographical distribution of molecular factors involved in endoderm formation at the caudal pole of the embryonic disc are still poorly defined. To discover common principles of mammalian germ layer development, pig and rabbit embryos at late gastrulation and early neurulation stages were analysed as species with a human-like embryonic disc morphology, using correlative light and electron microscopy. Close intercellular contact but no direct structural evidence of endoderm formation such as mesenchymal-epithelial transition between posterior primitive streak mesoderm and the emerging posterior endoderm were found. However, a two-step process closely related to posterior germ layer differentiation emerged for the formation of the cloacal membrane: (i) a continuous mesoderm layer and numerous patches of electron-dense flocculent extracellular matrix mark the prospective region of cloacal membrane formation; and (ii) mesoderm cells and all extracellular matrix including the basement membrane are lost locally and close intercellular contact between the endoderm and ectoderm is established. The latter process involves single cells at first and then gradually spreads to form a longitudinally oriented seam-like cloacal membrane. These gradual changes were found from gastrulation to early somite stages in the pig, whereas they were found from early somite to mid-somite stages in the rabbit; in both species cloacal membrane formation is complete prior to secondary neurulation. The results highlight the structural requirements for endoderm formation during development of the hindgut and suggest new mechanisms for the pathogenesis of common urogenital and anorectal malformations.
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Affiliation(s)
- Romia Hassoun
- Department of Anatomy and Embryology, Göttingen University, Göttingen, Germany
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