Early events in sea urchin metamorphosis, description and analysis

Journal of Morphology
R Andrew Cameron, R T Hinegardner

Abstract

The larval epithelium of the sea urchin, Lytechinus pictus, consists of squamous cells and bands of columnar epithelial cells bearing cilia. During metamorphosis this tissue undergoes a series of rapid, complex changes. Through the scanning and transmission electron microscope, we describe and analyse these changes. The changes can be divided into three steps. (1) The larval arms bend away from the left side of the larva, exposing the urchin rudiment. Cells which are identical to smooth muscle cells are in a position to bring about this bending. (2) The squamous epithelial cells assume a cuboidal shape. This change in shape results in the collapse of the larval epithelium onto the presumptive aboral surface. These cells possess a subapical band of microfilaments. The cellular shape change but not the bending of the arms is reversibly inhibited by Cytochalasin B. These observations suggest a mechanism for this change. (3) The former lining of the vestibule of the urchin rudiment comes to lie over the collapsed larval tissue and forms the adult epithelium. At this point, after only one hour, the larva has assumed the external shape of an adult sea urchin.

References

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Citations

Jan 1, 1989·Molecular Reproduction and Development·R A CameronE H Davidson
May 3, 2007·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Cory D Bishop, Bruce P Brandhorst
Jul 10, 2020·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Katherine T Nesbit, Amro Hamdoun
Jun 25, 1998·Development, Growth & Differentiation·M SaitoK Ishihara
Jul 1, 1991·Trends in Genetics : TIG·R A Cameron, E H Davidson
May 28, 2021·Developmental Dynamics : an Official Publication of the American Association of Anatomists·Victor D Vacquier, Amro Hamdoun
Oct 24, 2006·Developmental Biology·Stefan C MaternaR Andrew Cameron

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