Document Detail

Common and divergent pathways in alternative developmental processes of ascidians.
MedLine Citation:
PMID:  16937358     Owner:  NLM     Status:  MEDLINE    
Colonial ascidians offer opportunities to investigate how developmental events are integrated to generate the animal form, since they can develop similar individuals (oozooids from eggs, blastozooids from pluripotent somatic cells) through very different reproductive processes, i.e. embryogenesis and blastogenesis. Moreover, thanks to their key phylogenetic position, they can help in the understanding of the molecular mechanisms of morphogenesis and their evolution in chordates. We review organogenesis of the ascidian neural complex comparing embryos and buds in terms of topology, developmental mechanisms and terminology. We propose a new interpretation of bud territories, and reconsider nervous system development based on recent results suggesting that ascidians have vertebrate placodal and neural-crest-like cells. Comparing embryonic and blastogenic development in Botryllus schlosseri, we propose that the bud has territories with a placodal potentiality, suggesting that chordate ancestors possessed neurogenic placodes, and that the genetic pathways regulating neurogenic placode formation were co-opted for new developmental processes, such as blastogenesis.
Lucia Manni; Paolo Burighel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  BioEssays : news and reviews in molecular, cellular and developmental biology     Volume:  28     ISSN:  0265-9247     ISO Abbreviation:  Bioessays     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-08-31     Completed Date:  2007-03-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8510851     Medline TA:  Bioessays     Country:  United States    
Other Details:
Languages:  eng     Pagination:  902-12     Citation Subset:  IM    
Copyright Information:
(c) 2006 Wiley periodicals, Inc.
Department of Biology, University of Padova, Italy.
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MeSH Terms
Embryo, Nonmammalian / embryology
Germ Layers
Life Cycle Stages
Neural Crest / embryology
Urochordata / embryology*,  growth & development

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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