The developmental hourglass model: a predictor of the basic body plan?
Development
; 141(24): 4649-55, 2014 Dec.
Article
em En
| MEDLINE
| ID: mdl-25468934
ABSTRACT
The hourglass model of embryonic evolution predicts an hourglass-like divergence during animal embryogenesis - with embryos being more divergent at the earliest and latest stages but conserved during a mid-embryonic (phylotypic) period that serves as a source of the basic body plan for animals within a phylum. Morphological observations have suggested hourglass-like divergence in various vertebrate and invertebrate groups, and recent molecular data support this model. However, further investigation is required to determine whether the phylotypic period represents a basic body plan for each animal phylum, and whether this principle might apply at higher taxonomic levels. Here, we discuss the relationship between the basic body plan and the phylotypic stage, and address the possible mechanisms that underlie hourglass-like divergence.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Padronização Corporal
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Organogênese
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Desenvolvimento Embrionário
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Evolução Biológica
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Modelos Biológicos
Tipo de estudo:
Prognostic_studies
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Risk_factors_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article