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DEVELOPMENTAL BASIS OF TOOTHLESSNESS IN TURTLES: INSIGHT INTO CONVERGENT EVOLUTION OF VERTEBRATE MORPHOLOGY

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DEVELOPMENTAL BASIS OF TOOTHLESSNESS IN TURTLES: INSIGHT INTO CONVERGENT EVOLUTION OF VERTEBRATE MORPHOLOGY

Auteurs : Masayoshi Tokita [Japon] ; Win Chaeychomsri [Thaïlande] ; Jindawan Siruntawineti [Thaïlande]

Source :

Evolution [ 0014-3820 ] ; 2013-01.

RBID : ISTEX:9AB044E118899EAF1F60FCC1F3B746A7E111FF4C

English descriptors

KwdEn :
- Anterior part, Biol, Bmp4, Crocodile, Crocodile embryos, Dental epithelium, Dental mesenchyme, Dental papilla, Dentition, Dlx2, Dlx5, Embryo, Embryogenesis, Enamel, Entire part, Epithelial, Epithelium, Evol, Evolution january, Expression domain, Expression pattern, Fgf8, Fraser, Frontal section, Gene, Gene expression, Gene expression patterns, Germ, Hedgehog, Inner layer, Intensive expression, Internal domain, January, Lateral, Lineage, Louchart, Lower jaws, Maas, Mandible, Mandibular, Mandibular mesenchyme, Medial, Medial part, Medial portion, Medial region, Mesenchymal, Mesenchymal cells, Mesenchyme, Molecular mechanisms, Msx1, Msx2, Msx2 expression, Neub, Odontoblast, Odontoblast development, Odontogenesis, Odontogenic, Oral cavity, Oral epithelium, Outgrowth, Pax9, Pitx2, Ptc1, Scale bars, Sonic hedgehog, Tetrapod, Tissue outgrowth, Tissue outgrowths, Tooth agenesis, Tooth development, Tooth germ, Tooth germs, Tooth loss, Toothed, Toothless, Turtle, Turtle embryogenesis, Turtle embryos, Ventral, Ventral population, Vertebrate, Zhang.
Teeft :
- Anterior part, Biol, Bmp4, Crocodile, Crocodile embryos, Dental epithelium, Dental mesenchyme, Dental papilla, Dentition, Dlx2, Dlx5, Embryo, Embryogenesis, Enamel, Entire part, Epithelial, Epithelium, Evol, Evolution january, Expression domain, Expression pattern, Fgf8, Fraser, Frontal section, Gene, Gene expression, Gene expression patterns, Germ, Hedgehog, Inner layer, Intensive expression, Internal domain, January, Lateral, Lineage, Louchart, Lower jaws, Maas, Mandible, Mandibular, Mandibular mesenchyme, Medial, Medial part, Medial portion, Medial region, Mesenchymal, Mesenchymal cells, Mesenchyme, Molecular mechanisms, Msx1, Msx2, Msx2 expression, Neub, Odontoblast, Odontoblast development, Odontogenesis, Odontogenic, Oral cavity, Oral epithelium, Outgrowth, Pax9, Pitx2, Ptc1, Scale bars, Sonic hedgehog, Tetrapod, Tissue outgrowth, Tissue outgrowths, Tooth agenesis, Tooth development, Tooth germ, Tooth germs, Tooth loss, Toothed, Toothless, Turtle, Turtle embryogenesis, Turtle embryos, Ventral, Ventral population, Vertebrate, Zhang.

Abstract

The tooth is a major component of the vertebrate feeding apparatus and plays a crucial role in species survival, thus subjecting tooth developmental programs to strong selective constraints. However, irrespective of their functional importance, teeth have been lost in multiple lineages of tetrapod vertebrates independently. To understand both the generality and the diversity of developmental mechanisms that cause tooth agenesis in tetrapods, we investigated expression patterns of a series of tooth developmental genes in the lower jaw of toothless turtles and compared them to that of toothed crocodiles and the chicken as a representative of toothless modern birds. In turtle embryos, we found impairment of Shh signaling in the oral epithelium and early‐stage arrest of odontoblast development caused by termination of Msx2 expression in the dental mesenchyme. Our data indicate that such changes underlie tooth agenesis in turtles and suggest that the mechanism that leads to early‐stage odontogenic arrest differs between birds and turtles. Our results demonstrate that the cellular and molecular mechanisms that regulate early‐stage arrest of tooth development are diverse in tetrapod lineages, and odontogenic developmental programs may respond to changes in upstream molecules similarly thereby evolving convergently with feeding morphology.

Url:

https://api.istex.fr/document/9AB044E118899EAF1F60FCC1F3B746A7E111FF4C/fulltext/pdf

DOI: 10.1111/j.1558-5646.2012.01752.x

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ISTEX:9AB044E118899EAF1F60FCC1F3B746A7E111FF4C

Le document en format XML

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<term>Biol</term>
<term>Bmp4</term>
<term>Crocodile</term>
<term>Crocodile embryos</term>
<term>Dental epithelium</term>
<term>Dental mesenchyme</term>
<term>Dental papilla</term>
<term>Dentition</term>
<term>Dlx2</term>
<term>Dlx5</term>
<term>Embryo</term>
<term>Embryogenesis</term>
<term>Enamel</term>
<term>Entire part</term>
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<term>Evol</term>
<term>Evolution january</term>
<term>Expression domain</term>
<term>Expression pattern</term>
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<term>Gene expression</term>
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<term>Lateral</term>
<term>Lineage</term>
<term>Louchart</term>
<term>Lower jaws</term>
<term>Maas</term>
<term>Mandible</term>
<term>Mandibular</term>
<term>Mandibular mesenchyme</term>
<term>Medial</term>
<term>Medial part</term>
<term>Medial portion</term>
<term>Medial region</term>
<term>Mesenchymal</term>
<term>Mesenchymal cells</term>
<term>Mesenchyme</term>
<term>Molecular mechanisms</term>
<term>Msx1</term>
<term>Msx2</term>
<term>Msx2 expression</term>
<term>Neub</term>
<term>Odontoblast</term>
<term>Odontoblast development</term>
<term>Odontogenesis</term>
<term>Odontogenic</term>
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<term>Oral epithelium</term>
<term>Outgrowth</term>
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<term>Scale bars</term>
<term>Sonic hedgehog</term>
<term>Tetrapod</term>
<term>Tissue outgrowth</term>
<term>Tissue outgrowths</term>
<term>Tooth agenesis</term>
<term>Tooth development</term>
<term>Tooth germ</term>
<term>Tooth germs</term>
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<term>Toothed</term>
<term>Toothless</term>
<term>Turtle</term>
<term>Turtle embryogenesis</term>
<term>Turtle embryos</term>
<term>Ventral</term>
<term>Ventral population</term>
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<term>Zhang</term>
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<term>Biol</term>
<term>Bmp4</term>
<term>Crocodile</term>
<term>Crocodile embryos</term>
<term>Dental epithelium</term>
<term>Dental mesenchyme</term>
<term>Dental papilla</term>
<term>Dentition</term>
<term>Dlx2</term>
<term>Dlx5</term>
<term>Embryo</term>
<term>Embryogenesis</term>
<term>Enamel</term>
<term>Entire part</term>
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<term>Epithelium</term>
<term>Evol</term>
<term>Evolution january</term>
<term>Expression domain</term>
<term>Expression pattern</term>
<term>Fgf8</term>
<term>Fraser</term>
<term>Frontal section</term>
<term>Gene</term>
<term>Gene expression</term>
<term>Gene expression patterns</term>
<term>Germ</term>
<term>Hedgehog</term>
<term>Inner layer</term>
<term>Intensive expression</term>
<term>Internal domain</term>
<term>January</term>
<term>Lateral</term>
<term>Lineage</term>
<term>Louchart</term>
<term>Lower jaws</term>
<term>Maas</term>
<term>Mandible</term>
<term>Mandibular</term>
<term>Mandibular mesenchyme</term>
<term>Medial</term>
<term>Medial part</term>
<term>Medial portion</term>
<term>Medial region</term>
<term>Mesenchymal</term>
<term>Mesenchymal cells</term>
<term>Mesenchyme</term>
<term>Molecular mechanisms</term>
<term>Msx1</term>
<term>Msx2</term>
<term>Msx2 expression</term>
<term>Neub</term>
<term>Odontoblast</term>
<term>Odontoblast development</term>
<term>Odontogenesis</term>
<term>Odontogenic</term>
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<term>Oral epithelium</term>
<term>Outgrowth</term>
<term>Pax9</term>
<term>Pitx2</term>
<term>Ptc1</term>
<term>Scale bars</term>
<term>Sonic hedgehog</term>
<term>Tetrapod</term>
<term>Tissue outgrowth</term>
<term>Tissue outgrowths</term>
<term>Tooth agenesis</term>
<term>Tooth development</term>
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<term>Toothless</term>
<term>Turtle</term>
<term>Turtle embryogenesis</term>
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<front><div type="abstract" xml:lang="en">The tooth is a major component of the vertebrate feeding apparatus and plays a crucial role in species survival, thus subjecting tooth developmental programs to strong selective constraints. However, irrespective of their functional importance, teeth have been lost in multiple lineages of tetrapod vertebrates independently. To understand both the generality and the diversity of developmental mechanisms that cause tooth agenesis in tetrapods, we investigated expression patterns of a series of tooth developmental genes in the lower jaw of toothless turtles and compared them to that of toothed crocodiles and the chicken as a representative of toothless modern birds. In turtle embryos, we found impairment of Shh signaling in the oral epithelium and early‐stage arrest of odontoblast development caused by termination of Msx2 expression in the dental mesenchyme. Our data indicate that such changes underlie tooth agenesis in turtles and suggest that the mechanism that leads to early‐stage odontogenic arrest differs between birds and turtles. Our results demonstrate that the cellular and molecular mechanisms that regulate early‐stage arrest of tooth development are diverse in tetrapod lineages, and odontogenic developmental programs may respond to changes in upstream molecules similarly thereby evolving convergently with feeding morphology.</div>
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DEVELOPMENTAL BASIS OF TOOTHLESSNESS IN TURTLES: INSIGHT INTO CONVERGENT EVOLUTION OF VERTEBRATE MORPHOLOGY

DEVELOPMENTAL BASIS OF TOOTHLESSNESS IN TURTLES: INSIGHT INTO CONVERGENT EVOLUTION OF VERTEBRATE MORPHOLOGY

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Abstract

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