DEVELOPMENTAL BASIS OF TOOTHLESSNESS IN TURTLES: INSIGHT INTO CONVERGENT EVOLUTION OF VERTEBRATE MORPHOLOGY
Identifieur interne : 002C87 ( Main/Exploration ); précédent : 002C86; suivant : 002C88DEVELOPMENTAL 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.
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:
DOI: 10.1111/j.1558-5646.2012.01752.x
Affiliations:
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<term>Bmp4</term>
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<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>
<term>Epithelial</term>
<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>
<term>Oral cavity</term>
<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>
<term>Tooth germ</term>
<term>Tooth germs</term>
<term>Tooth loss</term>
<term>Toothed</term>
<term>Toothless</term>
<term>Turtle</term>
<term>Turtle embryogenesis</term>
<term>Turtle embryos</term>
<term>Ventral</term>
<term>Ventral population</term>
<term>Vertebrate</term>
<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>
<term>Epithelial</term>
<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>
<term>Oral cavity</term>
<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>
<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>
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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>
</front>
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