Tunicate gastrulation.
Curr Top Dev Biol
; 136: 219-242, 2020.
Article
em En
| MEDLINE
| ID: mdl-31959289
ABSTRACT
Tunicates are a diverse group of invertebrate marine chordates that includes the larvaceans, thaliaceans, and ascidians. Because of their unique evolutionary position as the sister group of the vertebrates, tunicates are invaluable as a comparative model and hold the promise of revealing both conserved and derived features of chordate gastrulation. Descriptive studies in a broad range of tunicates have revealed several important unifying traits that make them unique among the chordates, including invariant cell lineages through gastrula stages and an overall morphological simplicity. Gastrulation has only been studied in detail in ascidians such as Ciona and Phallusia, where it involves a simple cup-shaped gastrula driven primarily by endoderm invagination. This appears to differ significantly from vertebrate models, such as Xenopus, in which mesoderm convergent extension and epidermal epiboly are major contributors to involution. These differences may reflect the cellular simplicity of the ascidian embryo.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Urocordados
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Regulação da Expressão Gênica no Desenvolvimento
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Padronização Corporal
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Embrião não Mamífero
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Endoderma
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Gastrulação
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Gástrula
Limite:
Animals
Idioma:
En
Revista:
Curr Top Dev Biol
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Estados Unidos