Old, new and new-old concepts about the evolution of teeth
The evolutionary origin of teeth from dermal denticles (odontodes) that developed in the mouth cavity, designated as outside-in hypothesis, has long been undisputed. The outside-in hypothesis is based on the conclusion that dermal denticles and teeth fulfil the criteria of homology in an exemplary m...
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ftunivgent:oai:archive.ugent.be:5779261 2023-06-11T04:10:20+02:00 Old, new and new-old concepts about the evolution of teeth Witten, Paul Eckhard Sire, J-Y Huysseune, Ann 2014 application/pdf https://biblio.ugent.be/publication/5779261 http://hdl.handle.net/1854/LU-5779261 https://doi.org/10.1111/jai.12532 https://biblio.ugent.be/publication/5779261/file/5779263 eng eng https://biblio.ugent.be/publication/5779261 http://hdl.handle.net/1854/LU-5779261 http://dx.doi.org/10.1111/jai.12532 https://biblio.ugent.be/publication/5779261/file/5779263 No license (in copyright) info:eu-repo/semantics/restrictedAccess JOURNAL OF APPLIED ICHTHYOLOGY ISSN: 0175-8659 Biology and Life Sciences VERTEBRATE DENTITION SALMO-SALAR L ATLANTIC SALMON JAWED VERTEBRATES TOOTH DEVELOPMENT DERMAL SKELETON ORIGIN HOMOLOGY SCALES CONODONTS journalArticle info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2014 ftunivgent https://doi.org/10.1111/jai.12532 2023-05-10T22:24:00Z The evolutionary origin of teeth from dermal denticles (odontodes) that developed in the mouth cavity, designated as outside-in hypothesis, has long been undisputed. The outside-in hypothesis is based on the conclusion that dermal denticles and teeth fulfil the criteria of homology in an exemplary manner. Over the past 15 years, this hypothesis has been challenged. Proponents of the alternative inside-out hypothesis suggest that teeth did not evolve from dermal denticles, that they are of endodermal origin (forming in conjunction with neural crest-derived mesenchyme) and that they evolved several times independently in different lineages of vertebrates. Key arguments for the inside-out hypothesis are mineralized structures of conodonts that are accepted as teeth, the exclusive acceptance of placoderm pharyngeal denticles as teeth, together with the rejection of the presence of teeth in basal placoderms. We summarize the results of recent studies that have been triggered by the fruitful discussion between the two conflicting hypotheses. New findings support the traditional outside-in hypothesis: the mineralized elements of conodonts are not teeth, and the oral cusps in basal placoderms are true teeth. Furthermore, new developmental and molecular data clarify homology between teeth and dermal denticles. Today a new synthesis is emerging about the evolutionary origin of teeth from dermal denticles and about the unity of the elements of the dermal skeleton. Article in Journal/Newspaper Atlantic salmon Salmo salar Ghent University Academic Bibliography Journal of Applied Ichthyology 30 4 636 642 |
institution |
Open Polar |
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Ghent University Academic Bibliography |
op_collection_id |
ftunivgent |
language |
English |
topic |
Biology and Life Sciences VERTEBRATE DENTITION SALMO-SALAR L ATLANTIC SALMON JAWED VERTEBRATES TOOTH DEVELOPMENT DERMAL SKELETON ORIGIN HOMOLOGY SCALES CONODONTS |
spellingShingle |
Biology and Life Sciences VERTEBRATE DENTITION SALMO-SALAR L ATLANTIC SALMON JAWED VERTEBRATES TOOTH DEVELOPMENT DERMAL SKELETON ORIGIN HOMOLOGY SCALES CONODONTS Witten, Paul Eckhard Sire, J-Y Huysseune, Ann Old, new and new-old concepts about the evolution of teeth |
topic_facet |
Biology and Life Sciences VERTEBRATE DENTITION SALMO-SALAR L ATLANTIC SALMON JAWED VERTEBRATES TOOTH DEVELOPMENT DERMAL SKELETON ORIGIN HOMOLOGY SCALES CONODONTS |
description |
The evolutionary origin of teeth from dermal denticles (odontodes) that developed in the mouth cavity, designated as outside-in hypothesis, has long been undisputed. The outside-in hypothesis is based on the conclusion that dermal denticles and teeth fulfil the criteria of homology in an exemplary manner. Over the past 15 years, this hypothesis has been challenged. Proponents of the alternative inside-out hypothesis suggest that teeth did not evolve from dermal denticles, that they are of endodermal origin (forming in conjunction with neural crest-derived mesenchyme) and that they evolved several times independently in different lineages of vertebrates. Key arguments for the inside-out hypothesis are mineralized structures of conodonts that are accepted as teeth, the exclusive acceptance of placoderm pharyngeal denticles as teeth, together with the rejection of the presence of teeth in basal placoderms. We summarize the results of recent studies that have been triggered by the fruitful discussion between the two conflicting hypotheses. New findings support the traditional outside-in hypothesis: the mineralized elements of conodonts are not teeth, and the oral cusps in basal placoderms are true teeth. Furthermore, new developmental and molecular data clarify homology between teeth and dermal denticles. Today a new synthesis is emerging about the evolutionary origin of teeth from dermal denticles and about the unity of the elements of the dermal skeleton. |
format |
Article in Journal/Newspaper |
author |
Witten, Paul Eckhard Sire, J-Y Huysseune, Ann |
author_facet |
Witten, Paul Eckhard Sire, J-Y Huysseune, Ann |
author_sort |
Witten, Paul Eckhard |
title |
Old, new and new-old concepts about the evolution of teeth |
title_short |
Old, new and new-old concepts about the evolution of teeth |
title_full |
Old, new and new-old concepts about the evolution of teeth |
title_fullStr |
Old, new and new-old concepts about the evolution of teeth |
title_full_unstemmed |
Old, new and new-old concepts about the evolution of teeth |
title_sort |
old, new and new-old concepts about the evolution of teeth |
publishDate |
2014 |
url |
https://biblio.ugent.be/publication/5779261 http://hdl.handle.net/1854/LU-5779261 https://doi.org/10.1111/jai.12532 https://biblio.ugent.be/publication/5779261/file/5779263 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
JOURNAL OF APPLIED ICHTHYOLOGY ISSN: 0175-8659 |
op_relation |
https://biblio.ugent.be/publication/5779261 http://hdl.handle.net/1854/LU-5779261 http://dx.doi.org/10.1111/jai.12532 https://biblio.ugent.be/publication/5779261/file/5779263 |
op_rights |
No license (in copyright) info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/jai.12532 |
container_title |
Journal of Applied Ichthyology |
container_volume |
30 |
container_issue |
4 |
container_start_page |
636 |
op_container_end_page |
642 |
_version_ |
1768384683605753856 |