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Latent homologues for the neural crest as an evolutionary novelty
Author(s) -
Stone Jon R.,
Hall Brian K.
Publication year - 2004
Publication title -
evolution and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 78
eISSN - 1525-142X
pISSN - 1520-541X
DOI - 10.1111/j.1525-142x.2004.04014.x
Subject(s) - neural crest , biology , novelty , context (archaeology) , evolutionary biology , synapomorphy , germ layer , evolutionary developmental biology , gene , genetics , phylogenetics , paleontology , psychology , clade , embryonic stem cell , induced pluripotent stem cell , social psychology
Summary The neural crest is a craniate synapomorphy and a bona fide evolutionary novelty. Recently, researchers considering intriguingly similar patterns of gene expression, cell behaviors, and embryogenetic processes in noncraniate deuterostomes have suggested that cephalochordates, urochordates, and echinoderms or their ancestors might have possessed cells that were precursors to the neural crest or its constituent cells. To emphasize the caution with which similarities at genetic, cellular, or embryological levels should be interpreted as substantiations for cell, germ layer, or tissue homologies, we present and evaluate additional tantalizing evidence that could be considered as documenting neural crest precursors in precraniates. Furthermore, we propose an evolutionary context—latent homologue—within which these data should be interpreted.