Document Detail

Epithelial type, ingression, blastopore architecture and the evolution of chordate mesoderm morphogenesis.
MedLine Citation:
PMID:  18041055     Owner:  NLM     Status:  MEDLINE    
Chordate embryos show an evolutionary trend in the mechanisms they use to internalize presumptive mesoderm, relying predominantly on invagination in the basal chordates, varying combinations of involution and ingression in the anamniote vertebrates and reptiles, and predominantly on ingression in birds and mammals. This trend is associated with variations in epithelial type and changes in embryonic architecture as well as variations in the type of blastopore formed by an embryo. We also note the surprising conservation of the involution, during gastrulation, of at least a subset of the notochordal cells throughout the chordates, and suggest that this indicates a constraint on morphogenic evolution based on a functional linkage between architecture and patterning. Finally, we propose a model for the evolutionary transitions from gastrulation through a urodele amphibian-type blastopore to gastrulation through a primitive streak, as in chick or mouse.
David R Shook; Ray Keller
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Review    
Journal Detail:
Title:  Journal of experimental zoology. Part B, Molecular and developmental evolution     Volume:  310     ISSN:  1552-5007     ISO Abbreviation:  J. Exp. Zool. B Mol. Dev. Evol.     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-24     Completed Date:  2008-03-06     Revised Date:  2009-10-05    
Medline Journal Info:
Nlm Unique ID:  101168228     Medline TA:  J Exp Zool B Mol Dev Evol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  85-110     Citation Subset:  IM    
Department of Biology, University of Virginia, Charlottesville, Virginia 22904-4328, USA.
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MeSH Terms
Cell Differentiation
Chordata / embryology*
Epithelial Cells / cytology
Gastrula / cytology,  embryology*,  physiology
Mesoderm / cytology,  embryology*
Grant Support

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