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Signalling Systems in Cnidaria

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Book cover Cell Signalling in Prokaryotes and Lower Metazoa

Summary

The freshwater polyp, Hydra has long been used as a model for studying mechanisms controlling pattern formation and the axial polarity of the body column. It has been suggested that body patterning is dependent on the presence of internal morphogens. A variety of different candidate molecules, in Hydra and other cnidarians, have been proposed as putative morphogens. They are derived from different cellular sources and the evidence for their ability to act as morphogens is critically assessed. The actions of any morphogens will be mediated by signal transduction pathways and such pathways have been demonstrated in cnidarians. The phosphatidylinositol-protein kinase C system appears to be the major pathway involved in pattern formation. Cnidarians are able to respond to external cues which trigger key events in their life cycle, such as metamorphosis. Internal neurohormones, particularly members of the GLWamide family of neuropeptides, transmit the signals to all parts of the body and the signalling cascades involved in these events have been explored. Colonial forms possess the ability to recognise each other as self or non-self. Interactions between neighbouring colonies lead either to fusion or to the destruction of one of the colonies. The phenomenon, which may be linked to the competition for living space, is reminiscent of the allorecognition/allorejection responses observed in other invertebrates and vertebrates. The presence of these mechanisms in such simple organisms as cnidarians suggests that they arose early in evolution. To date, the signalling systems involved in the behaviours in cnidarians have not been studied in any depth.

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Authors and Affiliations

  1. Department of Physiology and Developmental Biology, Zoological Institute, University, INF 230, D 69120, Heidelberg, Germany

    Werner Müller

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  1. School of Biology and Biochemistry, The Queen’s University of Belfast, Belfast, Northern Ireland

    Ian Fairweather

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© 2004 Springer Science+Business Media Dordrecht

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Müller, W. (2004). Signalling Systems in Cnidaria. In: Fairweather, I. (eds) Cell Signalling in Prokaryotes and Lower Metazoa. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0998-9_4

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  • DOI: https://doi.org/10.1007/978-94-017-0998-9_4

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-90-481-6483-7

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