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First‐generation teeth in nonmammalian lineages: Evidence for a conserved ancestral character?

Identifieur interne : 000300 ( France/Analysis ); précédent : 000299; suivant : 000301

First‐generation teeth in nonmammalian lineages: Evidence for a conserved ancestral character?

Auteurs : Jean-Yves Sire [France] ; Tiphaine Davit-Beal [France] ; Sidney Delgado [France] ; Christine Van Der Heyden [Belgique] ; Ann Huysseune [Belgique]

Source :

RBID : ISTEX:06652B89B4FD73D01EEC85869AB6D1C5BAB05408

Descripteurs français

English descriptors

Abstract

The present study focuses on the main characteristics of first‐generation teeth (i.e., the first teeth of the dentition to develop in a given position and to become functional) in representatives of the major lineages of nonmammalian vertebrates (chondrichthyans, actinopterygians, and sarcopterygians: dipnoans, urodeles, squamates, and crocodiles). Comparative investigations on the LM and TEM level reveal the existence of two major types of first‐generation teeth. One type (generalized Type 1) is characterized by its small size, conical shape, atubular dentine, and small pulp cavity without capillaries and blood vessels. This type is found in actinopterygians, dipnoans, and urodeles and coincides with the occurrence of short embryonic periods in these species. The other type assembles a variety of first‐generation teeth, which have in common that they represent miniature versions of adult teeth. They are generally larger than the first type, have more complex shapes, tubular dentine, and a large pulp cavity containing blood vessels. These teeth are found in chondrichtyans, squamates, and crocodiles, taxa which all share an extended embryonic period. The presence in certain taxa of a particular type of first‐generation teeth is neither linked to their phylogenetic relationships nor to adult body size or tooth structure, but relates to the duration of embryonic development. Given that the plesiomorphic state in vertebrates is a short embryonic development, we consider the generalized Type 1 first‐generation tooth to represent an ancestral character for gnathostomes. We hypothesize that an extended embryonic development leads to the suppression of tooth generations in the development of dentition. These may still be present in the form of rudimentary germs in the embryonic period. In our view, this generalized Type 1 first‐generation teeth has been conserved through evolution because it represents a very economic and efficient way of building small and simple teeth adapted to larval life. The highly adapted adult dentition characteristic for each lineage has been possible only through polyphyodonty. Microsc. Res. Tech. 59:408–434, 2002. © 2002 Wiley‐Liss, Inc.

Url:
DOI: 10.1002/jemt.10220


Affiliations:


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ISTEX:06652B89B4FD73D01EEC85869AB6D1C5BAB05408

Le document en format XML

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<term>Actinopterygians</term>
<term>Adult teeth</term>
<term>Alligator mississipiensis</term>
<term>Ameloblast</term>
<term>Amia calva</term>
<term>Anat</term>
<term>Anguilla</term>
<term>Anguilla australis</term>
<term>Ankylosed</term>
<term>Arrowhead</term>
<term>Attachment</term>
<term>Attachment bone</term>
<term>Basal</term>
<term>Basal region</term>
<term>Basement membrane</term>
<term>Berkovitz</term>
<term>Bimaculatus</term>
<term>Biol</term>
<term>Blood vessels</term>
<term>Bone support</term>
<term>Brils</term>
<term>Buccal</term>
<term>Buccal epithelium</term>
<term>Cambridge university press</term>
<term>Carpio</term>
<term>Cell processes</term>
<term>Ceratobranchial cartilage</term>
<term>Cervical</term>
<term>Cervical loop</term>
<term>Chalumnae</term>
<term>Chibon</term>
<term>Cichlid</term>
<term>Collagen</term>
<term>Collagenous</term>
<term>Conical</term>
<term>Crocodile</term>
<term>Cyprinus carpio</term>
<term>Danio</term>
<term>Danio rerio</term>
<term>Days posthatching</term>
<term>Dental epithelium</term>
<term>Dental lamina</term>
<term>Dental organ</term>
<term>Dental papilla</term>
<term>Dentary</term>
<term>Dentary bone</term>
<term>Dentine</term>
<term>Dentine cone</term>
<term>Dentine matrix</term>
<term>Dentine shaft</term>
<term>Dentine surface</term>
<term>Dentine wall</term>
<term>Dentition</term>
<term>Edta</term>
<term>Embryo</term>
<term>Enamel</term>
<term>Enamel layer</term>
<term>Enamel matrix</term>
<term>Enamel organ</term>
<term>Enameloid</term>
<term>Enameloid matrix</term>
<term>Epithelial</term>
<term>Epithelial cells</term>
<term>Epithelium</term>
<term>Esox lucius</term>
<term>Forsteri</term>
<term>Functional teeth</term>
<term>Functional tooth</term>
<term>Generalized type</term>
<term>Greven</term>
<term>Hatchling</term>
<term>Hemichromis</term>
<term>Hoplosternum</term>
<term>Hoplosternum littorale</term>
<term>Huysseune</term>
<term>Lamina</term>
<term>Larva</term>
<term>Larval</term>
<term>Larval teeth</term>
<term>Latimeria</term>
<term>Latimeria chalumnae</term>
<term>Lineage</term>
<term>Littorale</term>
<term>Lond</term>
<term>Long axis</term>
<term>Lower jaws</term>
<term>Matrix</term>
<term>Matrix vesicles</term>
<term>Maturation process</term>
<term>Mature dentine</term>
<term>Medullary cavity</term>
<term>Mesenchymal</term>
<term>Mesenchymal cells</term>
<term>Mesenchyme</term>
<term>Mineralization</term>
<term>Mineralized</term>
<term>Morphol</term>
<term>Neoceratodus</term>
<term>Neoceratodus forsteri</term>
<term>Nerve endings</term>
<term>Nonmammalian</term>
<term>Nonmammalian vertebrates</term>
<term>Odontoblast</term>
<term>Odontoblast processes</term>
<term>Odontoblast prolongations</term>
<term>Odontoblastic prolongations</term>
<term>Odontoblasts</term>
<term>Older embryos</term>
<term>Ontogenetic</term>
<term>Ontogeny</term>
<term>Organic matrix</term>
<term>Orthodentine</term>
<term>Osborn</term>
<term>Osteoglossum bicirrhosum</term>
<term>Papilla</term>
<term>Perichondral bone</term>
<term>Petrodentine</term>
<term>Peyer</term>
<term>Pharyngeal</term>
<term>Pleurodeles</term>
<term>Predentine</term>
<term>Predentine matrix</term>
<term>Premaxillary</term>
<term>Premaxillary bone</term>
<term>Present study</term>
<term>Primary attachment</term>
<term>Proc</term>
<term>Prolongation</term>
<term>Prostak</term>
<term>Pulp</term>
<term>Pulp cavity</term>
<term>Reif</term>
<term>Replacement teeth</term>
<term>Replacement tooth</term>
<term>Rerio</term>
<term>Roux</term>
<term>Rstgeneration teeth</term>
<term>Sasagawa</term>
<term>Scale bars</term>
<term>Scarus</term>
<term>Scyliorhinus canicula</term>
<term>Shark</term>
<term>Shellis</term>
<term>Shes</term>
<term>Sire</term>
<term>Skobe</term>
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<term>Teleost</term>
<term>Thin layer</term>
<term>Thin sections</term>
<term>Tooth</term>
<term>Tooth attachment</term>
<term>Tooth base</term>
<term>Tooth development</term>
<term>Tooth formation</term>
<term>Tooth germ</term>
<term>Tooth replacement</term>
<term>Tooth surface</term>
<term>Transverse sections</term>
<term>Tubule</term>
<term>Unmineralized</term>
<term>Upper region</term>
<term>Urodele</term>
<term>Vertebrate</term>
<term>Vesicle</term>
<term>Westergaard</term>
<term>Zool</term>
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<term>Actinopterygians</term>
<term>Adult teeth</term>
<term>Alligator mississipiensis</term>
<term>Ameloblast</term>
<term>Amia calva</term>
<term>Anat</term>
<term>Anguilla</term>
<term>Anguilla australis</term>
<term>Ankylosed</term>
<term>Arrowhead</term>
<term>Attachment</term>
<term>Attachment bone</term>
<term>Basal</term>
<term>Basal region</term>
<term>Basement membrane</term>
<term>Berkovitz</term>
<term>Bimaculatus</term>
<term>Biol</term>
<term>Blood vessels</term>
<term>Bone support</term>
<term>Brils</term>
<term>Buccal</term>
<term>Buccal epithelium</term>
<term>Cambridge university press</term>
<term>Carpio</term>
<term>Cell processes</term>
<term>Ceratobranchial cartilage</term>
<term>Cervical</term>
<term>Cervical loop</term>
<term>Chalumnae</term>
<term>Chibon</term>
<term>Cichlid</term>
<term>Collagen</term>
<term>Collagenous</term>
<term>Conical</term>
<term>Crocodile</term>
<term>Cyprinus carpio</term>
<term>Danio</term>
<term>Danio rerio</term>
<term>Days posthatching</term>
<term>Dental epithelium</term>
<term>Dental lamina</term>
<term>Dental organ</term>
<term>Dental papilla</term>
<term>Dentary</term>
<term>Dentary bone</term>
<term>Dentine</term>
<term>Dentine cone</term>
<term>Dentine matrix</term>
<term>Dentine shaft</term>
<term>Dentine surface</term>
<term>Dentine wall</term>
<term>Dentition</term>
<term>Edta</term>
<term>Embryo</term>
<term>Enamel</term>
<term>Enamel layer</term>
<term>Enamel matrix</term>
<term>Enamel organ</term>
<term>Enameloid</term>
<term>Enameloid matrix</term>
<term>Epithelial</term>
<term>Epithelial cells</term>
<term>Epithelium</term>
<term>Esox lucius</term>
<term>Forsteri</term>
<term>Functional teeth</term>
<term>Functional tooth</term>
<term>Generalized type</term>
<term>Greven</term>
<term>Hatchling</term>
<term>Hemichromis</term>
<term>Hoplosternum</term>
<term>Hoplosternum littorale</term>
<term>Huysseune</term>
<term>Lamina</term>
<term>Larva</term>
<term>Larval</term>
<term>Larval teeth</term>
<term>Latimeria</term>
<term>Latimeria chalumnae</term>
<term>Lineage</term>
<term>Littorale</term>
<term>Lond</term>
<term>Long axis</term>
<term>Lower jaws</term>
<term>Matrix</term>
<term>Matrix vesicles</term>
<term>Maturation process</term>
<term>Mature dentine</term>
<term>Medullary cavity</term>
<term>Mesenchymal</term>
<term>Mesenchymal cells</term>
<term>Mesenchyme</term>
<term>Mineralization</term>
<term>Mineralized</term>
<term>Morphol</term>
<term>Neoceratodus</term>
<term>Neoceratodus forsteri</term>
<term>Nerve endings</term>
<term>Nonmammalian</term>
<term>Nonmammalian vertebrates</term>
<term>Odontoblast</term>
<term>Odontoblast processes</term>
<term>Odontoblast prolongations</term>
<term>Odontoblastic prolongations</term>
<term>Odontoblasts</term>
<term>Older embryos</term>
<term>Ontogenetic</term>
<term>Ontogeny</term>
<term>Organic matrix</term>
<term>Orthodentine</term>
<term>Osborn</term>
<term>Osteoglossum bicirrhosum</term>
<term>Papilla</term>
<term>Perichondral bone</term>
<term>Petrodentine</term>
<term>Peyer</term>
<term>Pharyngeal</term>
<term>Pleurodeles</term>
<term>Predentine</term>
<term>Predentine matrix</term>
<term>Premaxillary</term>
<term>Premaxillary bone</term>
<term>Present study</term>
<term>Primary attachment</term>
<term>Proc</term>
<term>Prolongation</term>
<term>Prostak</term>
<term>Pulp</term>
<term>Pulp cavity</term>
<term>Reif</term>
<term>Replacement teeth</term>
<term>Replacement tooth</term>
<term>Rerio</term>
<term>Roux</term>
<term>Rstgeneration teeth</term>
<term>Sasagawa</term>
<term>Scale bars</term>
<term>Scarus</term>
<term>Scyliorhinus canicula</term>
<term>Shark</term>
<term>Shellis</term>
<term>Shes</term>
<term>Sire</term>
<term>Skobe</term>
<term>Specialized adult</term>
<term>Taxon</term>
<term>Teleost</term>
<term>Thin layer</term>
<term>Thin sections</term>
<term>Tooth</term>
<term>Tooth attachment</term>
<term>Tooth base</term>
<term>Tooth development</term>
<term>Tooth formation</term>
<term>Tooth germ</term>
<term>Tooth replacement</term>
<term>Tooth surface</term>
<term>Transverse sections</term>
<term>Tubule</term>
<term>Unmineralized</term>
<term>Upper region</term>
<term>Urodele</term>
<term>Vertebrate</term>
<term>Vesicle</term>
<term>Westergaard</term>
<term>Zool</term>
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<div type="abstract" xml:lang="en">The present study focuses on the main characteristics of first‐generation teeth (i.e., the first teeth of the dentition to develop in a given position and to become functional) in representatives of the major lineages of nonmammalian vertebrates (chondrichthyans, actinopterygians, and sarcopterygians: dipnoans, urodeles, squamates, and crocodiles). Comparative investigations on the LM and TEM level reveal the existence of two major types of first‐generation teeth. One type (generalized Type 1) is characterized by its small size, conical shape, atubular dentine, and small pulp cavity without capillaries and blood vessels. This type is found in actinopterygians, dipnoans, and urodeles and coincides with the occurrence of short embryonic periods in these species. The other type assembles a variety of first‐generation teeth, which have in common that they represent miniature versions of adult teeth. They are generally larger than the first type, have more complex shapes, tubular dentine, and a large pulp cavity containing blood vessels. These teeth are found in chondrichtyans, squamates, and crocodiles, taxa which all share an extended embryonic period. The presence in certain taxa of a particular type of first‐generation teeth is neither linked to their phylogenetic relationships nor to adult body size or tooth structure, but relates to the duration of embryonic development. Given that the plesiomorphic state in vertebrates is a short embryonic development, we consider the generalized Type 1 first‐generation tooth to represent an ancestral character for gnathostomes. We hypothesize that an extended embryonic development leads to the suppression of tooth generations in the development of dentition. These may still be present in the form of rudimentary germs in the embryonic period. In our view, this generalized Type 1 first‐generation teeth has been conserved through evolution because it represents a very economic and efficient way of building small and simple teeth adapted to larval life. The highly adapted adult dentition characteristic for each lineage has been possible only through polyphyodonty. Microsc. Res. Tech. 59:408–434, 2002. © 2002 Wiley‐Liss, Inc.</div>
</front>
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