Morphogenetic mechanisms of coelom formation in the direct-developing sea urchin <Emphasis Type="Italic">Heliocidaris erythrogramma</Emphasis> |
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Authors: | Margaret S Smith Steve Collins Rudolf A Raff |
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Institution: | (1) Department of Biology, Indiana University, Bloomington, IN 47405, USA;(2) School of Biological Sciences, University of Sydney, Sydney, NSW, 2006, Australia;(3) Present address: Department of Entomology, University of Georgia, Athens, GA 30602, USA |
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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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Keywords: | Sea urchin Gastrulation Morphogenetic Cell division Heliocidaris erythrogramma |
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