Neurogenic and non-neurogenic placodes in ascidians

Autor: Paolo Burighel, Stefano Tiozzo, Jean-Stéphane Joly, Giovanna Zaniolo, Nancy J. Lane, Lucia Manni, Fabio Gasparini, Federico Caicci
Přispěvatelé: Universita di Padova, University of Cambridge [UK] (CAM), USC CNRS jeune équipe Développement, Evolution et Plasticité du Système Nerveux (DEPSN), Institut National de la Recherche Agronomique (INRA), Dipartimento di Biologia, Universita degli Studi di Padova, Department of Zoology, Développement, évolution et plasticité du système nerveux (DEPSN), Centre National de la Recherche Scientifique (CNRS), Institut de Neurobiologie Alfred Fessard (INAF), Università degli Studi di Padova = University of Padua (Unipd), Laboratoire de Biologie du Développement de Villefranche sur mer (LBDV), Observatoire océanologique de Villefranche-sur-mer (OOVM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Dipartimento di Biologia, Università di Padova
Jazyk: angličtina
Rok vydání: 2004
Předmět:
Cell type
Embryo
Nonmammalian
Ectoderm ultrastructure
Cellular differentiation
Neurogenic placodes
[SDV]Life Sciences [q-bio]
Morphogenesis
Botryllus schlosseri
Urochordata anatomy & histology
Microscopy Electron
Nervous System
03 medical and health sciences
0302 clinical medicine
Embryo Nonmammalian embryology
biology.animal
Ectoderm
medicine
Animals
Comparative Study
Ciona intestinalis
[INFO]Computer Science [cs]
Urochordata
Phylogeny
ComputingMilieux_MISCELLANEOUS
030304 developmental biology
0303 health sciences
PLACODE
biology
Vertebrate
Cell Differentiation
General Medicine
Anatomy
biology.organism_classification
Cell biology
ASCIDIAN
Microscopy
Electron
[SDV.BDD.EO]Life Sciences [q-bio]/Development Biology/Embryology and Organogenesis
medicine.anatomical_structure
Italy
[SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]
Animal Science and Zoology
Basal lamina
030217 neurology & neurosurgery
Zdroj: Journal of Experimental Zoology
Journal of Experimental Zoology, Wiley, 2004, 302B (5), pp.483-504
HAL
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution, Wiley, 2004, 302, pp.483. ⟨10.1002/jez.b.21013⟩
J. Exp. Zool. (Mol. Dev. Evol.)
J. Exp. Zool. (Mol. Dev. Evol.), 2004, 302, pp.483-504. ⟨10.1002/jez.b.21013⟩
ISSN: 0022-104X
1097-010X
1552-5007
1552-5015
DOI: 10.1002/jez.b.21013⟩
Popis: International audience; The late differentiation of the ectodermal layer is analysed in the ascidians Ciona intestinalis and Botryllus schlosseri, by means of light and electron microscopy, in order to verify the possible presence of placodal structures. Cranial placodes, ectodermal regions giving rise to nonepidermal cell types, are classically found exclusively in vertebrates; however, data are accumulating to demonstrate that the nonvertebrate chordates possess both the genetic machinery involved in placode differentiation, and ectodermal structures that are possible homologues of vertebrate placodes. Here, the term ''placode'' is used in a broad sense and defines thickenings of the ectodermal layer that can exhibit an interruption of the basal lamina where cells delaminate, and so are able to acquire a nonepidermal fate. A number of neurogenic placodes, ones capable of producing neurons, have been recognised; their derivatives have been analysed and their possible homologies with vertebrate placodes are discussed. In particular, the stomodeal placode may be considered a multiple placode, being composed of different sorts of placodes: part of it, which differentiates hair cells, is discussed as homologous to the octavo-lateralis placodes, while the remaining portion, giving rise to the ciliated duct of the neural gland, is considered homologous to the adenohypophyseal placode. The neurohypophyseal placode may include the homologues of the hypothalamus and vertebrate olfactory placode; the rostral placode, producing the sensorial papillae, may possibly be homologous to the placodes of the adhesive gland of vertebrates.
Databáze: OpenAIRE
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