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Animal EvolutionGenomes, Fossils, and Trees$
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Maximilian J. Telford and D.T.J. Littlewood

Print publication date: 2009

Print ISBN-13: 9780199549429

Published to Oxford Scholarship Online: September 2009

DOI: 10.1093/acprof:oso/9780199549429.001.0001

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Molecular genetic insights into deuterostome evolution from the direct-developing hemichordate Saccoglossus kowalevskii

Molecular genetic insights into deuterostome evolution from the direct-developing hemichordate Saccoglossus kowalevskii

Chapter:
(p.93) CHAPTER 10 Molecular genetic insights into deuterostome evolution from the direct-developing hemichordate Saccoglossus kowalevskii
Source:
Animal Evolution
Author(s):

Christopher J. Lowe

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199549429.003.0010

Progress in developmental biology, phylogenomics, and palaeontology over the past five years has made major contributions to a long-enduring problem in comparative biology: the early origins of the deuterostome phyla. A detailed characterization of the early development of the enteropneust hemichordate, Saccoglossus kowalevskii, revealed close developmental genetic similarities between hemichordates and chordates during early body plan formation. The two phyla share close transcriptional and signaling ligand expression patterns during the early development of the anteroposterior and dorsoventral axes, despite large morphological disparity between the body plans. These genetic networks have been proposed to play conserved roles in patterning centralized nervous systems in metazoans, yet likely play conserved roles in patterning the diffusely organized basiepithelial nerve net of the hemichordates. Developmental genetic data are providing a unique insight into early deuterostome evolution, revealing a complexity of genetic regulation previously attributed only to vertebrates. Although these data allow for key insights into the development of early deuterostomes, their utility for reconstructing ancestral morphologies is less certain; morphological, palaeontological and molecular datasets should all be considered carefully when speculating about ancestral deuterostome features.

Keywords:   hemichordate, body plan, deuterostome, nervous system evolution

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