Cited by 47Developmental Biology and Gene RegulationMarine Invertebrate Physiology and EcologyPlanarian Biology and Electrostimulation

Quantitative assessment of Hox complex expression in the indirect development of the polychaete annelid Chaetopterus sp.

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Peterson, Kevin J., Irvine, Steven Q., Cameron, R. Andrew, Davidson, Eric H.·2000·Proceedings of the National Academy of Sciences

Abstract

A prediction from the set-aside theory of bilaterian origins is that pattern formation processes such as those controlled by the Hox cluster genes are required specifically for adult body plan formation. This prediction can be tested in animals that use maximal indirect development, in which the embryonic formation of the larva and the postembryonic formation of the adult body plan are temporally and spatially distinct. To this end, we quantitatively measured the amount of transcripts for five Hox genes in embryos of a lophotrochozoan, the polychaete annelid Chaetopterus sp. The polychaete Hox complex is shown not to be expressed during embryogenesis, but transcripts of all measured Hox complex genes are detected at significant levels during the initial stages of adult body plan formation. Temporal colinearity in the sequence of their activation is observed, so that activation follows the 3'-5' arrangement of the genes. Moreover, Hox gene expression is spatially localized to the region of teloblastic set-aside cells of the later-stage embryos. This study shows that an indirectly developing lophotrochozoan shares with an indirectly developing deuterostome, the sea urchin, a common mode of Hox complex utilization: construction of the larva, whether a trochophore or dipleurula, does not involve Hox cluster expression, but in both forms the complex is expressed in the set-aside cells from which the adult body plan derives.

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Authors
Peterson, K. J., Irvine, S. Q., Cameron, R. A., & Davidson, E. H.
Affiliations
California Institute of Technology (US)
Corresponding author
Davidson, Eric H.
Venue
Proceedings of the National Academy of Sciences
Published
2000-04-25
Volume
97
Issue
9
Pages
4487-4492
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1989717344
Cited by
47
References
43
Citations by year
2024: 1 · 2023: 2 · 2019: 1 · 2018: 1 · 2015: 2 · 2014: 3 · 2013: 2
FWCI
1.93
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Planarian Biology and Electrostimulation
Keywords
Hox genes, indirect development, Chaetopterus, Polychaeta, bilaterian origin, body plan formation, gene colinearity, embryonic development, lophotrochozoans, larval development, trochophore
MeSH terms
Brachyury Protein, Animals, Embryo, Nonmammalian, Biological Evolution, Female, Fetal Proteins, Genes, Homeobox, Multigene Family, Male, Molecular Sequence Data, Oocytes, Polychaeta, Spermatozoa, Transcription, Genetic, Gene Expression Regulation, Developmental, Evolution, Molecular, T-Box Domain Proteins

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