1
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Simpson LA, Crowley D, Forey T, Acosta H, Ferjentsik Z, Chatfield J, Payne A, Simpson BS, Redwood C, Dixon JE, Holmes N, Sang F, Alberio R, Loose M, Johnson AD. NANOG is required to establish the competence for germ-layer differentiation in the basal tetrapod axolotl. PLoS Biol 2023; 21:e3002121. [PMID: 37315073 PMCID: PMC10599592 DOI: 10.1371/journal.pbio.3002121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 10/25/2023] [Accepted: 04/13/2023] [Indexed: 06/16/2023] Open
Abstract
Pluripotency defines the unlimited potential of individual cells of vertebrate embryos, from which all adult somatic cells and germ cells are derived. Understanding how the programming of pluripotency evolved has been obscured in part by a lack of data from lower vertebrates; in model systems such as frogs and zebrafish, the function of the pluripotency genes NANOG and POU5F1 have diverged. Here, we investigated how the axolotl ortholog of NANOG programs pluripotency during development. Axolotl NANOG is absolutely required for gastrulation and germ-layer commitment. We show that in axolotl primitive ectoderm (animal caps; ACs) NANOG and NODAL activity, as well as the epigenetic modifying enzyme DPY30, are required for the mass deposition of H3K4me3 in pluripotent chromatin. We also demonstrate that all 3 protein activities are required for ACs to establish the competency to differentiate toward mesoderm. Our results suggest the ancient function of NANOG may be establishing the competence for lineage differentiation in early cells. These observations provide insights into embryonic development in the tetrapod ancestor from which terrestrial vertebrates evolved.
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Affiliation(s)
- Luke A. Simpson
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Darren Crowley
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Teri Forey
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Helena Acosta
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Zoltan Ferjentsik
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Jodie Chatfield
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Alexander Payne
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Benjamin S. Simpson
- Tumour Immunogenomics and Immunosurveillance Laboratory, University College London Cancer Institute, London, United Kingdom
- Cancer Dynamics Laboratory, The Francis Crick Institute, London, United Kingdom
| | - Catherine Redwood
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - James E. Dixon
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Nadine Holmes
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Fei Sang
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Ramiro Alberio
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, United Kingdom
| | - Matthew Loose
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
| | - Andrew D. Johnson
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham, United Kingdom
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2
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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: 19] [Impact Index Per Article: 6.3] [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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3
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Lloyd R, Alberio R, Crother BI. Andrew Johnson (1958-2021). Development 2021. [DOI: 10.1242/dev.200333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
ABSTRACT
Andrew Johnson, a pioneer in the development of the amphibian axolotl as a model to study the early stages of metazoan development, died 15th September 2021. Known as ‘AJ’ by his family, and by his friends and colleagues, his older sister Pam referred to him as an unstoppable ‘force of nature’ who at the age of 9 or 10 said to her, ‘I'm going to become a professor’. Here, we reflect on AJ's life and work, paying particular attention to his studies on the establishment of primordial germ cells in vertebrates.
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Affiliation(s)
- Robert Lloyd
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK
| | - Ramiro Alberio
- School of Biosciences, Sutton Bonington Campus, University of Nottingham, Nottingham, LE12 5RD, UK
| | - Brian I. Crother
- Department of Biology, Southeastern Louisiana University, Hammond, LA 70402, USA
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4
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Identification and expression analysis of Dazl homologue in Cynops cyanurus. ZYGOTE 2021; 30:221-226. [PMID: 34315561 DOI: 10.1017/s0967199421000538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The Dazl (deleted in azoospermia-like) gene encodes an RNA-binding protein containing an RNA recognition motif (RRM) and a DAZ motif. Dazl is essential for gametogenesis in vertebrates. In this study, we report the cloning of Dazl cDNA from Cynops cyanurus. Ccdazl mRNA showed a germline-specific expression pattern as expected. Ccdazl expression gradually decreased during oogenesis, suggesting that it may be involved in oocyte development. Phylogenetic analysis revealed that the Ccdazl protein shares conserved motifs/domains with Dazl proteins from other species. Cloning of Ccdazl provides a new tool to carry out comparative studies of germ cell development in amphibians.
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5
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Bruce AEE, Winklbauer R. Brachyury in the gastrula of basal vertebrates. Mech Dev 2020; 163:103625. [PMID: 32526279 DOI: 10.1016/j.mod.2020.103625] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/11/2020] [Accepted: 06/03/2020] [Indexed: 12/20/2022]
Abstract
The Brachyury gene encodes a transcription factor that is conserved across all animals. In non-chordate metazoans, brachyury is primarily expressed in ectoderm regions that are added to the endodermal gut during development, and often form a ring around the site of endoderm internalization in the gastrula, the blastopore. In chordates, this brachyury ring is conserved, but the gene has taken on a new role in the formation of the mesoderm. In this phylum, a novel type of mesoderm that develops into notochord and somites has been added to the ancestral lateral plate mesoderm. Brachyury contributes to a shift in cell fate from neural ectoderm to posterior notochord and somites during a major lineage segregation event that in Xenopus and in the zebrafish takes place in the early gastrula. In the absence of this brachyury function, impaired formation of posterior mesoderm indirectly affects the gastrulation movements of peak involution and convergent extension. These movements are confined to specific regions and stages, leaving open the question why brachyury expression in an extensive, coherent ring, before, during and after gastrulation, is conserved in the two species whose gastrulation modes differ considerably, and also in many other metazoan gastrulae of diverse structure.
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Affiliation(s)
- Ashley E E Bruce
- Department of Cell and Systems Biology, University of Toronto, Canada
| | - Rudolf Winklbauer
- Department of Cell and Systems Biology, University of Toronto, Canada.
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6
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Rothenberg EV. Encounters across networks: Windows into principles of genomic regulation. Mar Genomics 2019; 44:3-12. [PMID: 30661741 DOI: 10.1016/j.margen.2019.01.003] [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: 10/23/2018] [Revised: 01/06/2019] [Accepted: 01/06/2019] [Indexed: 12/13/2022]
Abstract
Gene regulatory networks account for the ability of the genome to program development in complex multi-cellular organisms. Such networks are based on principles of gene regulation by combinations of transcription factors that bind to specific cis-regulatory DNA sites to activate transcription. These cis-regulatory regions mediate logic processing at each network node, enabling progressive increases in organismal complexity with development. Gene regulatory network explanations of development have been shown to account for patterning and cell type diversification in fly and sea urchin embryonic systems, where networks are characterized by fast coupling between transcriptional inputs and changes in target gene transcription rates, and crucial cis-regulatory elements are concentrated relatively close to the protein coding sequences of the target genes, thus facilitating their identification. Stem cell-based development in post-embryonic mammalian systems also depends on gene networks, but differs from the fly and sea urchin systems. First, the number of regulatory elements per gene and the distances between regulatory elements and the genes they control are considerably larger, forcing searches via genome-wide transcription factor binding surveys rather than functional assays. Second, the intrinsic timing of network state transitions can be slowed considerably by the need to undo stem-cell chromatin configurations, which presumably add stability to stem-cell states but retard responses to transcription factor changes during differentiation. The dispersed, partially redundant cis-regulatory systems controlling gene expression and the slow state transition kinetics in these systems already reveal new insights and opportunities to extend understanding of the repertoire of gene networks and regulatory system logic.
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Affiliation(s)
- Ellen V Rothenberg
- Division of Biology & Biological Engineering, California Institute of Technology, Pasadena, CA, USA.
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Cancer reversion with oocyte extracts is mediated by cell cycle arrest and induction of tumour dormancy. Oncotarget 2018; 9:16008-16027. [PMID: 29662623 PMCID: PMC5882314 DOI: 10.18632/oncotarget.24664] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 02/27/2018] [Indexed: 11/25/2022] Open
Abstract
Inducing stable control of tumour growth by tumour reversion is an alternative approach to cancer treatment when eradication of the disease cannot be achieved. The process requires re-establishment of normal control mechanisms that are lost in cancer cells so that abnormal proliferation can be halted. Embryonic environments can reset cellular programmes and we previously showed that axolotl oocyte extracts can reprogram breast cancer cells and reverse their tumorigenicity. In this study, we analysed the gene expression profiles of oocyte extract-treated tumour xenografts to show that tumour reprogramming involves cell cycle arrest and acquisition of a quiescent state. Tumour dormancy is associated with increased P27 expression, restoration of RB function and downregulation of mitogen-activated signalling pathways. We also show that the quiescent state is associated with increased levels of H4K20me3 and decreased H4K20me1, an epigenetic profile leading to chromatin compaction. The epigenetic reprogramming induced by oocyte extracts is required for RB hypophosphorylation and induction of P27 expression, both occurring during exposure to the extracts and stably maintained in reprogrammed tumour xenografts. Therefore, this study demonstrates the value of oocyte molecules for inducing tumour reversion and for the development of new chemoquiescence-based therapies.
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Evans T, Johnson AD, Loose M. Virtual Genome Walking across the 32 Gb Ambystoma mexicanum genome; assembling gene models and intronic sequence. Sci Rep 2018; 8:618. [PMID: 29330416 PMCID: PMC5766544 DOI: 10.1038/s41598-017-19128-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 12/19/2017] [Indexed: 11/09/2022] Open
Abstract
Large repeat rich genomes present challenges for assembly using short read technologies. The 32 Gb axolotl genome is estimated to contain ~19 Gb of repetitive DNA making an assembly from short reads alone effectively impossible. Indeed, this model species has been sequenced to 20× coverage but the reads could not be conventionally assembled. Using an alternative strategy, we have assembled subsets of these reads into scaffolds describing over 19,000 gene models. We call this method Virtual Genome Walking as it locally assembles whole genome reads based on a reference transcriptome, identifying exons and iteratively extending them into surrounding genomic sequence. These assemblies are then linked and refined to generate gene models including upstream and downstream genomic, and intronic, sequence. Our assemblies are validated by comparison with previously published axolotl bacterial artificial chromosome (BAC) sequences. Our analyses of axolotl intron length, intron-exon structure, repeat content and synteny provide novel insights into the genic structure of this model species. This resource will enable new experimental approaches in axolotl, such as ChIP-Seq and CRISPR and aid in future whole genome sequencing efforts. The assembled sequences and annotations presented here are freely available for download from https://tinyurl.com/y8gydc6n . The software pipeline is available from https://github.com/LooseLab/iterassemble .
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Affiliation(s)
- Teri Evans
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK
| | - Andrew D Johnson
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK
| | - Matthew Loose
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK.
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9
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Watanabe M, Yasuoka Y, Mawaribuchi S, Kuretani A, Ito M, Kondo M, Ochi H, Ogino H, Fukui A, Taira M, Kinoshita T. Conservatism and variability of gene expression profiles among homeologous transcription factors in Xenopus laevis. Dev Biol 2017; 426:301-324. [DOI: 10.1016/j.ydbio.2016.09.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Revised: 07/27/2016] [Accepted: 09/19/2016] [Indexed: 12/11/2022]
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10
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Crother BI, White ME, Johnson AD. Diversification and Germ-Line Determination Revisited: Linking Developmental Mechanism with Species Richness. Front Ecol Evol 2016. [DOI: 10.3389/fevo.2016.00026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
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11
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Gordon NK, Gordon R. The organelle of differentiation in embryos: the cell state splitter. Theor Biol Med Model 2016; 13:11. [PMID: 26965444 PMCID: PMC4785624 DOI: 10.1186/s12976-016-0037-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 02/27/2016] [Indexed: 12/16/2022] Open
Abstract
The cell state splitter is a membraneless organelle at the apical end of each epithelial cell in a developing embryo. It consists of a microfilament ring and an intermediate filament ring subtending a microtubule mat. The microtubules and microfilament ring are in mechanical opposition as in a tensegrity structure. The cell state splitter is bistable, perturbations causing it to contract or expand radially. The intermediate filament ring provides metastability against small perturbations. Once this snap-through organelle is triggered, it initiates signal transduction to the nucleus, which changes gene expression in one of two readied manners, causing its cell to undergo a step of determination and subsequent differentiation. The cell state splitter also triggers the cell state splitters of adjacent cells to respond, resulting in a differentiation wave. Embryogenesis may be represented then as a bifurcating differentiation tree, each edge representing one cell type. In combination with the differentiation waves they propagate, cell state splitters explain the spatiotemporal course of differentiation in the developing embryo. This review is excerpted from and elaborates on "Embryogenesis Explained" (World Scientific Publishing, Singapore, 2016).
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Affiliation(s)
| | - Richard Gordon
- />Retired, University of Manitoba, Winnipeg, Canada
- />Embryogenesis Center, Gulf Specimen Aquarium & Marine Laboratory, 222 Clark Drive, Panacea, FL 32346 USA
- />C.S. Mott Center for Human Growth & Development, Department of Obstetrics & Gynecology, Wayne State University, 275 E. Hancock, Detroit, MI 48201 USA
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12
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Multicellular Mathematical Modelling of Mesendoderm Formation in Amphibians. Bull Math Biol 2016; 78:436-67. [PMID: 26934886 DOI: 10.1007/s11538-016-0150-8] [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: 03/23/2015] [Accepted: 01/04/2016] [Indexed: 10/22/2022]
Abstract
The earliest cell fate decisions in a developing embryo are those associated with establishing the germ layers. The specification of the mesoderm and endoderm is of particular interest as the mesoderm is induced from the endoderm, potentially from an underlying bipotential group of cells, the mesendoderm. Mesendoderm formation has been well studied in an amphibian model frog, Xenopus laevis, and its formation is driven by a gene regulatory network (GRN) induced by maternal factors deposited in the egg. We have recently demonstrated that the axolotl, a urodele amphibian, utilises a different topology in its GRN to specify the mesendoderm. In this paper, we develop spatially structured mathematical models of the GRNs governing mesendoderm formation in a line of cells. We explore several versions of the model of mesendoderm formation in both Xenopus and the axolotl, incorporating the key differences between these two systems. Model simulations are able to reproduce known experimental data, such as Nodal expression domains in Xenopus, and also make predictions about how the positional information derived from maternal factors may be interpreted to drive cell fate decisions. We find that whilst cell-cell signalling plays a minor role in Xenopus, it is crucial for correct patterning domains in axolotl.
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13
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Abstract
Embryos of many animal models express germ line determinants that suppress transcription and mediate early germ line commitment, which occurs before the somatic cell lineages are established. However, not all animals segregate their germ line in this manner. The 'last cell standing' model describes primordial germ cell (PGC) development in axolotls, in which PGCs are maintained by an extracellular signalling niche, and germ line commitment occurs after gastrulation. Here, we propose that this 'stochastic' mode of PGC specification is conserved in vertebrates, including non-rodent mammals. We postulate that early germ line segregation liberates genetic regulatory networks for somatic development to evolve, and that it therefore emerged repeatedly in the animal kingdom in response to natural selection.
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Affiliation(s)
- Andrew D Johnson
- School of Life Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK
| | - Ramiro Alberio
- School of Biosciences, Sutton Bonington Campus, University of Nottingham, Loughborough LE12 5RD, UK
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14
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Evren S, Wen JWH, Luu O, Damm EW, Nagel M, Winklbauer R. EphA4-dependent Brachyury expression is required for dorsal mesoderm involution in the Xenopus gastrula. Development 2014; 141:3649-61. [PMID: 25209247 DOI: 10.1242/dev.111880] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Xenopus provides a well-studied model of vertebrate gastrulation, but a central feature, the movement of the mesoderm to the interior of the embryo, has received little attention. Here, we analyze mesoderm involution at the Xenopus dorsal blastopore lip. We show that a phase of rapid involution - peak involution - is intimately linked to an early stage of convergent extension, which involves differential cell migration in the prechordal mesoderm and a new movement of the chordamesoderm, radial convergence. The latter process depends on Xenopus Brachyury, the expression of which at the time of peak involution is controlled by signaling through the ephrin receptor, EphA4, its ligand ephrinB2 and its downstream effector p21-activated kinase. Our findings support a conserved role for Brachyury in blastopore morphogenesis.
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Affiliation(s)
- Sevan Evren
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
| | - Jason W H Wen
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
| | - Olivia Luu
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
| | - Erich W Damm
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
| | - Martina Nagel
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
| | - Rudolf Winklbauer
- Department of Cell and Systems Biology, University of Toronto, 25 Harbord Street, Toronto, Ontario, Canada M5S 3G5
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15
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Chatfield J, O'Reilly MA, Bachvarova RF, Ferjentsik Z, Redwood C, Walmsley M, Patient R, Loose M, Johnson AD. Stochastic specification of primordial germ cells from mesoderm precursors in axolotl embryos. Development 2014; 141:2429-40. [PMID: 24917499 PMCID: PMC4050694 DOI: 10.1242/dev.105346] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Accepted: 04/22/2014] [Indexed: 01/18/2023]
Abstract
A common feature of development in most vertebrate models is the early segregation of the germ line from the soma. For example, in Xenopus and zebrafish embryos primordial germ cells (PGCs) are specified by germ plasm that is inherited from the egg; in mice, Blimp1 expression in the epiblast mediates the commitment of cells to the germ line. How these disparate mechanisms of PGC specification evolved is unknown. Here, in order to identify the ancestral mechanism of PGC specification in vertebrates, we studied PGC specification in embryos from the axolotl (Mexican salamander), a model for the tetrapod ancestor. In the axolotl, PGCs develop within mesoderm, and classic studies have reported their induction from primitive ectoderm (animal cap). We used an axolotl animal cap system to demonstrate that signalling through FGF and BMP4 induces PGCs. The role of FGF was then confirmed in vivo. We also showed PGC induction by Brachyury, in the presence of BMP4. These conditions induced pluripotent mesodermal precursors that give rise to a variety of somatic cell types, in addition to PGCs. Irreversible restriction of the germ line did not occur until the mid-tailbud stage, days after the somatic germ layers are established. Before this, germline potential was maintained by MAP kinase signalling. We propose that this stochastic mechanism of PGC specification, from mesodermal precursors, is conserved in vertebrates.
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Affiliation(s)
- Jodie Chatfield
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
| | - Marie-Anne O'Reilly
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
| | - Rosemary F Bachvarova
- Department of Cell and Developmental Biology, Weill Medical College of Cornell University, New York, NY 10065, USA
| | - Zoltan Ferjentsik
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
| | - Catherine Redwood
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
| | - Maggie Walmsley
- Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford OX3 9DS, UK
| | - Roger Patient
- Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford OX3 9DS, UK
| | - Mathew Loose
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
| | - Andrew D Johnson
- School of Life Sciences, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, UK
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16
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Evans T, Wade CM, Chapman FA, Johnson AD, Loose M. Acquisition of germ plasm accelerates vertebrate evolution. Science 2014; 344:200-3. [PMID: 24723612 DOI: 10.1126/science.1249325] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Primordial germ cell (PGC) specification occurs either by induction from pluripotent cells (epigenesis) or by a cell-autonomous mechanism mediated by germ plasm (preformation). Among vertebrates, epigenesis is basal, whereas germ plasm has evolved convergently across lineages and is associated with greater speciation. We compared protein-coding sequences of vertebrate species that employ preformation with their sister taxa that use epigenesis and demonstrate that genes evolve more rapidly in species containing germ plasm. Furthermore, differences in rates of evolution appear to cause phylogenetic incongruence in protein-coding sequence comparisons between vertebrate taxa. Our results support the hypothesis that germ plasm liberates constraints on somatic development and that enhanced evolvability drives the evolution of germ plasm.
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Affiliation(s)
- Teri Evans
- School of Life Sciences, University of Nottingham, Nottingham, NG7 2UH, UK
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17
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Brown LE, King JR, Loose M. Two different network topologies yield bistability in models of mesoderm and anterior mesendoderm specification in amphibians. J Theor Biol 2014; 353:67-77. [PMID: 24650939 PMCID: PMC4029075 DOI: 10.1016/j.jtbi.2014.03.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 03/06/2014] [Accepted: 03/09/2014] [Indexed: 01/03/2023]
Abstract
Understanding the Gene Regulatory Networks (GRNs) that underlie development is a major question for systems biology. The establishment of the germ layers is amongst the earliest events of development and has been characterised in numerous model systems. The establishment of the mesoderm is best characterised in the frog Xenopus laevis and has been well studied both experimentally and mathematically. However, the Xenopus network has significant differences from that in mouse and humans, including the presence of multiple copies of two key genes in the network, Mix and Nodal. The axolotl, a urodele amphibian, provides a model with all the benefits of amphibian embryology but crucially only a single Mix and Nodal gene required for the specification of the mesoderm. Remarkably, the number of genes within the network is not the only difference. The interaction between Mix and Brachyury, two transcription factors involved in the establishment of the endoderm and mesoderm respectively, is not conserved. While Mix represses Brachyury in Xenopus, it activates Brachyury in axolotl. Thus, whilst the topology of the networks in the two species differs, both are able to form mesoderm and endoderm in vivo. Based on current knowledge of the structure of the mesendoderm GRN we develop deterministic models that describe the time evolution of transcription factors in a single axolotl cell and compare numerical simulations with previous results from Xenopus. The models are shown to have stable steady states corresponding to mesoderm and anterior mesendoderm, with the in vitro model showing how the concentration of Activin can determine cell fate, while the in vivo model shows that β-catenin concentration can determine cell fate. Moreover, our analysis suggests that additional components must be important in the axolotl network in the specification of the full range of tissues. We present models of mesendoderm specification in the urodele amphibian, the axolotl. in vitro and in vivo models are simulated and compared with experimental data. The model topology differs from that of the anuran amphibian, Xenopus laevis. Steady states representing mesoderm and anterior mesendoderm are found in both models. Both the axolotl and Xenopus topologies can account for similar qualitative data.
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Affiliation(s)
- L E Brown
- MyCIB, School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK.
| | - J R King
- School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
| | - M Loose
- Centre for Genetics and Genomics, University of Nottingham, Queen׳s Medical Centre, Nottingham NG7 2UH, UK.
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18
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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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Middleton AM, King JR, Loose M. Wave pinning and spatial patterning in a mathematical model of Antivin/Lefty-Nodal signalling. J Math Biol 2012; 67:1393-424. [PMID: 23070212 DOI: 10.1007/s00285-012-0592-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Revised: 01/07/2012] [Indexed: 01/24/2023]
Abstract
Nodal signals are key regulators of mesoderm and endoderm development in vertebrate embryos. It has been observed experimentally that in Xenopus embryos the spatial range of Nodal signals is restricted by the signal Antivin (also known as Lefty). Nodal signals can activate both Nodal and Antivin, whereas Antivin is thought to antagonise Nodal by binding either directly to it or to its receptor. In this paper we develop a mathematical model of this signalling network in a line of cells. We consider the heterodimer and receptor-mediated inhibition mechanisms separately and find that, in both cases, the restriction by Antivin to the range of Nodal signals corresponds to wave pinning in the model. Our analysis indicates that, provided Antivin diffuses faster than Nodal, either mechanism can robustly account for the experimental data. We argue that, in the case of Xenopus development, it is wave pinning, rather than Turing-type patterning, that is underlying Nodal-Antivin dynamics. This leads to several experimentally testable predictions, which are discussed. Furthermore, for heterodimer-mediated inhibition to prevent waves of Nodal expression from propagating, the Nodal-Antivin complex must be turned over, and diffusivity of the complex must be negligible. In the absence of molecular mechanisms regulating these, we suggest that Antivin restricts Nodal signals via receptor-mediated, and not heterodimer-mediated, inhibition.
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Affiliation(s)
- A M Middleton
- Albert-Ludwigs-Universität, Habsburgerstrasse 49, Freiburg, 79104, Germany,
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20
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Kaneda T, Motoki JYD. Gastrulation and pre-gastrulation morphogenesis, inductions, and gene expression: Similarities and dissimilarities between urodelean and anuran embryos. Dev Biol 2012; 369:1-18. [DOI: 10.1016/j.ydbio.2012.05.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2011] [Revised: 05/14/2012] [Accepted: 05/18/2012] [Indexed: 10/28/2022]
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21
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Pereira LA, Wong MS, Mei Lim S, Stanley EG, Elefanty AG. The Mix family of homeobox genes—Key regulators of mesendoderm formation during vertebrate development. Dev Biol 2012; 367:163-77. [DOI: 10.1016/j.ydbio.2012.04.033] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 04/24/2012] [Accepted: 04/30/2012] [Indexed: 10/28/2022]
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22
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Elinson RP, del Pino EM. Developmental diversity of amphibians. WILEY INTERDISCIPLINARY REVIEWS. DEVELOPMENTAL BIOLOGY 2012; 1:345-69. [PMID: 22662314 PMCID: PMC3364608 DOI: 10.1002/wdev.23] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The current model amphibian, Xenopus laevis, develops rapidly in water to a tadpole which metamorphoses into a frog. Many amphibians deviate from the X. laevis developmental pattern. Among other adaptations, their embryos develop in foam nests on land or in pouches on their mother's back or on a leaf guarded by a parent. The diversity of developmental patterns includes multinucleated oogenesis, lack of RNA localization, huge non-pigmented eggs, and asynchronous, irregular early cleavages. Variations in patterns of gastrulation highlight the modularity of this critical developmental period. Many species have eliminated the larva or tadpole and directly develop to the adult. The wealth of developmental diversity among amphibians coupled with the wealth of mechanistic information from X. laevis permit comparisons that provide deeper insights into developmental processes.
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Affiliation(s)
- Richard P Elinson
- Department of Biological Sciences, Duquesne University, Pittsburgh, PA, USA.
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23
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Fuchs C, Scheinast M, Pasteiner W, Lagger S, Hofner M, Hoellrigl A, Schultheis M, Weitzer G. Self-organization phenomena in embryonic stem cell-derived embryoid bodies: axis formation and breaking of symmetry during cardiomyogenesis. Cells Tissues Organs 2011; 195:377-91. [PMID: 21860211 PMCID: PMC7615842 DOI: 10.1159/000328712] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/13/2011] [Indexed: 12/29/2022] Open
Abstract
Aggregation of embryonic stem cells gives rise to embryoid bodies (EBs) which undergo developmental processes reminiscent of early eutherian embryonic development. Development of the three germ layers suggests that gastrulation takes place. In vivo, gastrulation is a highly ordered process but in EBs only few data support the hypothesis that self-organization of differentiating cells leads to morphology, reminiscent of the early gastrula. Here we demonstrate that a timely implantation-like process is a prerequisite for the breaking of the radial symmetry of suspended EBs. Attached to a surface, EBs develop a bilateral symmetry and presumptive mesodermal cells emerge between the center of the EBs and a horseshoe-shaped ridge of cells. The development of an epithelial sheet of cells on one side of the EBs allows us to define an 'anterior' and a 'posterior' end of the EBs. In the mesodermal area, first cardiomyocytes (CMCs) develop mainly next to this epithelial sheet of cells. Development of twice as many CMCs at the 'left' side of the EBs breaks the bilateral symmetry and suggests that cardiomyogenesis reflects a local or temporal asymmetry in EBs. The asymmetric appearance of CMCs but not the development of mesoderm can be disturbed by ectopic expression of the muscle-specific protein Desmin. Later, the bilateral morphology becomes blurred by an apparently chaotic differentiation of many cell types. The absence of comparable structures in aggregates of cardiovascular progenitor cells isolated from the heart demonstrates that the self-organization of cells during a gastrulation-like process is a unique feature of embryonic stem cells.
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Affiliation(s)
- Christiane Fuchs
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Matthias Scheinast
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Waltraud Pasteiner
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Sabine Lagger
- Division of Molecular Genetics, Medical University of Vienna, Vienna, Austria
| | - Manuela Hofner
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Alexandra Hoellrigl
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Martina Schultheis
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
| | - Georg Weitzer
- Max F. Perutz Laboratories, Department of Medical Biochemistry, Division of Molecular Biology and
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24
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Peter IS, Davidson EH. Evolution of gene regulatory networks controlling body plan development. Cell 2011; 144:970-85. [PMID: 21414487 DOI: 10.1016/j.cell.2011.02.017] [Citation(s) in RCA: 245] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2010] [Revised: 12/16/2010] [Accepted: 02/10/2011] [Indexed: 11/29/2022]
Abstract
Evolutionary change in animal morphology results from alteration of the functional organization of the gene regulatory networks (GRNs) that control development of the body plan. A major mechanism of evolutionary change in GRN structure is alteration of cis-regulatory modules that determine regulatory gene expression. Here we consider the causes and consequences of GRN evolution. Although some GRN subcircuits are of great antiquity, other aspects are highly flexible and thus in any given genome more recent. This mosaic view of the evolution of GRN structure explains major aspects of evolutionary process, such as hierarchical phylogeny and discontinuities of paleontological change.
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Affiliation(s)
- Isabelle S Peter
- Division of Biology 156-29, California Institute of Technology, Pasadena, CA 91125, USA.
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25
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Allegrucci C, Rushton MD, Dixon JE, Sottile V, Shah M, Kumari R, Watson S, Alberio R, Johnson AD. Epigenetic reprogramming of breast cancer cells with oocyte extracts. Mol Cancer 2011; 10:7. [PMID: 21232089 PMCID: PMC3034708 DOI: 10.1186/1476-4598-10-7] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Accepted: 01/13/2011] [Indexed: 12/28/2022] Open
Abstract
BACKGROUND Breast cancer is a disease characterised by both genetic and epigenetic alterations. Epigenetic silencing of tumour suppressor genes is an early event in breast carcinogenesis and reversion of gene silencing by epigenetic reprogramming can provide clues to the mechanisms responsible for tumour initiation and progression. In this study we apply the reprogramming capacity of oocytes to cancer cells in order to study breast oncogenesis. RESULTS We show that breast cancer cells can be directly reprogrammed by amphibian oocyte extracts. The reprogramming effect, after six hours of treatment, in the absence of DNA replication, includes DNA demethylation and removal of repressive histone marks at the promoters of tumour suppressor genes; also, expression of the silenced genes is re-activated in response to treatment. This activity is specific to oocytes as it is not elicited by extracts from ovulated eggs, and is present at very limited levels in extracts from mouse embryonic stem cells. Epigenetic reprogramming in oocyte extracts results in reduction of cancer cell growth under anchorage independent conditions and a reduction in tumour growth in mouse xenografts. CONCLUSIONS This study presents a new method to investigate tumour reversion by epigenetic reprogramming. After testing extracts from different sources, we found that axolotl oocyte extracts possess superior reprogramming ability, which reverses epigenetic silencing of tumour suppressor genes and tumorigenicity of breast cancer cells in a mouse xenograft model. Therefore this system can be extremely valuable for dissecting the mechanisms involved in tumour suppressor gene silencing and identifying molecular activities capable of arresting tumour growth. These applications can ultimately shed light on the contribution of epigenetic alterations in breast cancer and advance the development of epigenetic therapies.
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Affiliation(s)
- Cinzia Allegrucci
- Centre for Genetics and Genomics, School of Biology, University of Nottingham, Queens Medical Centre, Nottingham, UK.
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Johnson AD, Richardson E, Bachvarova RF, Crother BI. Evolution of the germ line-soma relationship in vertebrate embryos. Reproduction 2011; 141:291-300. [PMID: 21228047 DOI: 10.1530/rep-10-0474] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The germ line and soma together maintain genetic lineages from generation to generation: the germ line passes genetic information between generations; the soma is the vehicle for germ line transmission, and is shaped by natural selection. The germ line and somatic lineages arise simultaneously in early embryos, but how their development is related depends on how primordial germ cells (PGC) are specified. PGCs are specified by one of two means. Epigenesis describes the induction of PGCs from pluripotent cells by signals from surrounding somatic tissues. In contrast, PGCs in many species are specified cell-autonomously by maternally derived molecules, known as germ plasm, and this is called preformation. Germ plasm inhibits signaling to PGCs; thus, they are specified cell-autonomously. Germ plasm evolved independently in many animal lineages, suggesting convergent evolution, and therefore it would be expected to convey a selective advantage. But, what this is remains unknown. We propose that the selective advantage that drives the emergence of germ plasm in vertebrates is the disengagement of germ line specification from somatic influences. This liberates the evolution of gene regulatory networks (GRNs) that govern somatic development, and thereby enhances species evolvability, a well-recognized selective advantage. We cite recent evidence showing that frog embryos, which contain germ plasm, have modified GRNs that are not conserved in axolotls, which represent more basal amphibians and employ epigenesis. We also present the correlation of preformation with enhanced species radiations, and we discuss the mutually exclusive trajectories influenced by germ plasm or pluripotency, which shaped chordate evolution.
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Affiliation(s)
- Andrew D Johnson
- School of Biology, Institute of Genetics, Queen's Medical Centre, University of Nottingham, Nottingham, NG7 2UH, UK.
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Dixon JE, Allegrucci C, Redwood C, Kump K, Bian Y, Chatfield J, Chen YH, Sottile V, Voss SR, Alberio R, Johnson AD. Axolotl Nanog activity in mouse embryonic stem cells demonstrates that ground state pluripotency is conserved from urodele amphibians to mammals. Development 2010; 137:2973-80. [PMID: 20736286 DOI: 10.1242/dev.049262] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cells in the pluripotent ground state can give rise to somatic cells and germ cells, and the acquisition of pluripotency is dependent on the expression of Nanog. Pluripotency is conserved in the primitive ectoderm of embryos from mammals and urodele amphibians, and here we report the isolation of a Nanog ortholog from axolotls (axNanog). axNanog does not contain a tryptophan repeat domain and is expressed as a monomer in the axolotl animal cap. The monomeric form is sufficient to regulate pluripotency in mouse embryonic stem cells, but axNanog dimers are required to rescue LIF-independent self-renewal. Our results show that protein interactions mediated by Nanog dimerization promote proliferation. More importantly, they demonstrate that the mechanisms governing pluripotency are conserved from urodele amphibians to mammals.
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Affiliation(s)
- James E Dixon
- Institute of Genetics, School of Biology, University of Nottingham, Queens Medical Centre, Nottingham NG2 2UH, UK
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