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PMID: 10781041 Published · ppublish English Journal Article Review

Inversion of the chordate body axis: are there alternatives?

Proceedings of the National Academy of Sciences of the United States of America ·Vol. 97 ·No. 9 ·2000-04-25 ·Pages 4445-8

Gerhart J

Abstract

One major morphological difference between chordates and annelids or arthropods is the opposite orientation of the nerve cord and heart. A long-standing proposal is that the chordate axis evolved by inverting the body of an ancestor with the annelid/arthropod orientation. However, the data can also be explained by a common ancestor with diffuse dorsoventral organization, followed by oppositely directed condensation of the nerve cord and relocation of the heart in the two lines.

Keywords
NASA Discipline Evolutionary Biology Non-NASA Center
MeSH Terms
Animals Annelida/anatomy & histology,embryology Arthropods/anatomy & histology,embryology Body Patterning Chordata, Nonvertebrate/anatomy & histology,embryology,genetics Evolution, Molecular Phylogeny RNA, Ribosomal, 18S/genetics
Chemicals
RNA, Ribosomal, 18S
Authors & Affiliations
1 authors, click to expand affiliations / ORCID
Gerhart J
Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3200, USA. [email protected]
Investigators
1 investigators, click to expand
Gerhart J C
U CA, Berkeley
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20 references, click to expand
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
DOI
10.1073/pnas.97.9.4445
Email
[email protected]
Published
2000-04-25
Pages
4445-8
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC34319
Subset
IM
External Links
PubMed source DOI: 10.1073/pnas.97.9.4445 PMC Full Text View journal details
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