The origins of the neural crest. Part II: an evolutionary perspective
Abstract
The neural crest and cranial ectodermal placodes are traditionally thought to be unique to vertebrates; however, they must have had evolutionary precursors. Here, we review recent evidence suggesting that such ancestral cell types can be identified in modern non-vertebrate chordates, such as amphioxus (a cephalochordate) and ascidians (urochordates). Hence, migratory neuroectodermal cells may well have been present in the common ancestor of the chordates, such that the possibility of their existence in non-chordate deuterostomes (hemichordates and echinoderms) must also be considered. Finally, we discuss the various non-neuronal cell types produced by the neural crest in order to demonstrate that it is plausible that these different cell types evolved from an ancestral population that was neuronal in nature.
Additional Information
© 1997 Elsevier Science Ireland Ltd. Received 15 May 1997; revised version received 11 August 1997; accepted 11 August 1997. Available online 19 February 1998. The authors would like to thank Drs Kristin Artinger, Ajay Chitnis, Wolfgang Driever, James Langeland, Michael Levine, Michael Thorndyke and Hiroshi Wada for communicating data prior to publication. We are indebted to Drs Thurston Lacalli, Kevin Peterson and Andres Collazo for their insights and for stimulating discussions. We thank Drs Andres Collazo, Kevin Peterson and Andrew Groves for their patient and critical reading of numerous drafts of the manuscript.Additional details
- Eprint ID
- 65631
- DOI
- 10.1016/S0925-4773(97)00129-9
- Resolver ID
- CaltechAUTHORS:20160323-142239375
- Created
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2016-03-24Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field