A different type of amphibian mesoderm morphogenesis in Ceratophrys ornata.

Ceratophrys ornata, the Argentinean horned frog, has a significantly different pattern of early morphogenesis than does the most studied amphibian, Xenopus laevis. Time-lapse videomicroscopy, scanning electron microscopy, histological sections and lineage tracers have shown that, in C. ornata, some prospective notochord, somite and tailbud mesoderm cells leave the surface epithelium of the archenteron by ingression. After gastrulation, SEM reveals cells with constricted apices and a bottle shape in three zones on the archenteron roof and in a fourth zone around the blastopore. Prospective somitic tissue ingresses first from two lateral zones, followed by ingression of prospective notochord from the medial zone and tailbud mesoderm from the circumblastoporal zone. This is unlike X. laevis, in which no cells with constricted apices are present on the dorsal surface of the archenteron, nor do any cells ingress into the deep mesodermal layers from the surface layer.

[1]  J. Shih,et al.  The function and mechanism of convergent extension during gastrulation of Xenopus laevis. , 1985, Journal of embryology and experimental morphology.

[2]  John B. Shoven,et al.  I , Edinburgh Medical and Surgical Journal.

[3]  J. Shih,et al.  The epithelium of the dorsal marginal zone of Xenopus has organizer properties. , 1992, Development.

[4]  M. Leptin.  Mechanics and Genetics of Cell Shape Changes during Drosophila Ventral Furrow Formation , 1991 .

[5]  S. Løvtrup.  Fate maps and gastrulation in Amphibia--a critique of current views. , 1975, Canadian journal of zoology.

[6]  R. Keller,et al.  Cell rearrangement during gastrulation of Xenopus: direct observation of cultured explants. , 1991, Development.

[7]  J. Pasteels.  New observations concerning the maps of presumptive areas of the young amphibian gastrula. (Amblystoma and Discoglossus) , 1942 .

[8]  J. Gerhart,et al.  Early cellular interactions promote embryonic axis formation in Xenopus laevis. , 1984, Developmental biology.

[9]  B. Burnside.  Microtubules and Microfilaments in Amphibian Neurulation , 1973 .

[10]  T. Darribère,et al.  A fate map of superficial and deep circumblastoporal cells in the early gastrula of Pleurodeles waltl. , 1992, Development.

[11]  P. Nieuwkoop,et al.  Primordial germ cells in the chordates , 1979 .

[12]  G. Schoenwolf,et al.  Quantitative analyses of changes in cell shapes during bending of the avian neural plate. , 1984, Developmental biology.

[13]  R. Gimlich.  Cytoplasmic localization and chordamesoderm induction in the frog embryo. , 1985, Journal of embryology and experimental morphology.

[14]  J. Shih,et al.  The patterning and functioning of protrusive activity during convergence and extension of the Xenopus organiser. , 1992, Development (Cambridge, England). Supplement.

[15]  Carmen R. Domingo,et al.  Pintallavis, a gene expressed in the organizer and midline cells of frog embryos: involvement in the development of the neural axis. , 1992 .

[16]  G. Oster,et al.  Cell rearrangement and segmentation in Xenopus: direct observation of cultured explants. , 1989, Development.

[17]  John Philip Trinkaus,et al.  Cells into Organs: The Forces That Shape the Embryo , 1984 .

[18]  P. Nieuwkoop,et al.  Embryological evidence for a possible polyphyletic origin of the recent amphibians. , 1976, Journal of embryology and experimental morphology.

[19]  L. Trueb,et al.  Biology of Amphibians , 1986 .

[20]  P. C. Baker.  FINE STRUCTURE AND MORPHOGENIC MOVEMENTS IN THE GASTRULA OF THE TREEFROG, HYLA REGILLA , 1965, The Journal of cell biology.

[21]  C. Ettensohn,et al.  Mechanisms of Epithelial Invagination , 1985, The Quarterly Review of Biology.

[22]  H. D. King.  THE FORMATION OF THE NOTOCHORD IN THE AMPHIBIA , 1903 .

[23]  J. Smith,et al.  The origin of the mesoderm in an anuran, Xenopus laevis, and a urodele, Ambystoma mexicanum. , 1983, Developmental biology.

[24]  R. Keller,et al.  Vital dye mapping of the gastrula and neurula of Xenopus laevis: I. Prospective areas and morphogenetic movements of the superficial layer , 1976 .

[25]  J. Hanken.  Developmental Evidence for Amphibian Origins , 1986 .

[26]  R. Brun,et al.  Notochord formation in the Mexican Salamander (Ambystoma mexicanum) is different from notochord formation in Xenopus laevis , 1984 .

[27]  L. Trueb,et al.  Evolution of pipoid frogs intergeneric relationships of the aquatic frog family pipidae anura , 1988 .

[28]  R. Kodama,et al.  Demonstration of contractility of circumferential actin bundles and its morphogenetic significance in pigmented epithelium in vitro and in vivo , 1981, The Journal of cell biology.

[29]  E. Wiley.  Phylogenetics: The Theory and Practice of Phylogenetic Systematics , 1981 .

[30]  J Hardin,et al.  The behaviour and function of bottle cells during gastrulation of Xenopus laevis. , 1988, Development.

[31]  J. Löfberg.  Apical surface topography of invaginating and noninvaginating cells. A scanning-transmission study of amphibian neurulae. , 1974, Developmental biology.

[32]  R. Keller,et al.  The cellular basis of amphibian gastrulation. , 1986, Developmental biology.

[33]  M. Asashima,et al.  Effects of inducers on inner and outer gastrula ectoderm layers of Xenopus laevis. , 1982, Differentiation; research in biological diversity.

[34]  R. Keller,et al.  Vital Dye Mapping of the Gastrula and Neurula of Xenopus Laevis , 1975 .

[35]  C. Lundmark.  Role of bilateral zones of ingressing superficial cells during gastrulation of Ambystoma mexicanum. , 1986, Journal of embryology and experimental morphology.

[36]  W. W. Ballard,et al.  Morphogenetic movements in acipenserid embryos , 1980 .

[37]  W. W. Ballard.  Morphogenetic Movements and Fate Maps of Vertebrates , 1981 .

[38]  J. Shih,et al.  Cell motility driving mediolateral intercalation in explants of Xenopus laevis. , 1992, Development.