An electron microscopic study of early developmental stages, myogenesis, oogenesis and cnidogenesis in the anthomedusa, Podocoryne carnea M. Sars
Abstract
This descriptive electron microscopic study of the blastogenetic medusa development of Podocoryne carnea focuses on the earliest stages of primordium formation, myogenesis, oogenesis and cnidogenesis. The events which take place at the cellular level prior to the formation of stage 1 (Frey, '68), which are characterized by ecto- and entodermal accumulations of undifferentiated I-cells and the beginning of transdifferentiation of epithelial cells, have been subdivided into four distinct stages (U1-U4). The genealogy of cells participating in medusa differentiation indicates that some cell types of the medusa are derived by transdifferentiation from the polyp's epithelial cells, while others originate by differentiation from I-cells. The myogenesis of the subumbrellar muscle cells resembles vertebrate myocardiac differentiation in many respects.
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Because entocodon cells are clearly separated from ectoderm and endoderm by an extracellular matrix, they constitute a third germ layer.
“Because the entocodon cells are clearly separated from the ectoderm and endoderm by the formation of an extracellular matrix (Boelsterli, 1977; m in Fig. 5), they constitute a third germ layer”
From Evolutionary aspects of developmentally regulated helix-loop-helix transcription factors in striated muscle of jellyfish (2003) · cites this paper as Boelsterli, 1977
The earliest striated myofibers appear in a small number of cells at stage 3-4 in the outer entocodal layer.
“The first striated myofibers differentiate in very few cells at stage 3-4 in the outer entocodal layer (Boelsterli, 1977; Fig. 5).”
From Evolutionary aspects of developmentally regulated helix-loop-helix transcription factors in striated muscle of jellyfish (2003) · cites this paper as Boelsterli, 1977
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References 69 · Cited by 69
- Authors
- Boelsterli, U.
- Affiliations
- University of Zurich (CH)
- Corresponding author
- Boelsterli, Urs
- Venue
- Journal of Morphology
- Publisher
- Wiley
- Published
- 1977-11
- Volume
- 154
- Issue
- 2
- Pages
- 259-289
- ISSN
- 0362-2525 (ISSN-L)
- 1097-4687
- OpenAlex
- W2143337504
- Cited by
- 69
- References
- 69
- Citations by year
- 2024: 1 · 2022: 1 · 2020: 2 · 2019: 2 · 2018: 1 · 2017: 1 · 2015: 2 · 2014: 1 · 2012: 1
- FWCI
- 1.44
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Morphology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Developmental Biology and Gene Regulation
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Planarian Biology and Electrostimulation
- Keywords
- Podocoryne carnea, medusa development, blastogenesis, myogenesis, oogenesis, I-cells, transdifferentiation, epithelial cells, cell lineage, polyps
- MeSH terms
- Animals, Cell Differentiation, Cnidaria, Muscles, Oogenesis
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