Abstract
Indirect development via a feeding pluteus larva represents the ancestral mode of sea urchin development. However, some sea urchin species exhibit a derived form of development, called direct development, in which features of the feeding larva are replaced by accelerated development of the adult. A major difference between these two developmental modes is the timing of the formation of the left coelom and initiation of adult development. These processes occur much earlier in developmental and absolute time in direct developers and may be underlain by changes in morphogenetic processes. In this study, we explore whether differences in the cellular mechanisms responsible for the development of the left coelom and adult structures are associated with the change in the timing of their formation in the direct-developing sea urchin Heliocidaris erythrogramma. We present evidence that left coelom formation in H. erythrogramma, which differs in major aspects of coelom formation in indirect developers, is not a result of cell division. Further, we demonstrate that subsequent development of adult structures requires cell division.
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Acknowledgments
This work was supported by a grant from the National Science Foundation to R.A.R., IBN-0234576 and support from an NSF predoctoral fellowship and NSF IGERT fellowship to M.S.S. We also thank the School of Biological Sciences at the University of Sydney and the Sydney aquarium for generous use of their facilities.
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Smith, M.S., Collins, S. & Raff, R.A. Morphogenetic mechanisms of coelom formation in the direct-developing sea urchin Heliocidaris erythrogramma . Dev Genes Evol 219, 21–29 (2009). https://doi.org/10.1007/s00427-008-0262-8
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DOI: https://doi.org/10.1007/s00427-008-0262-8