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Cell-Cell Adhesion in the Cnidaria: Insights Into the Evolution of Tissue Morphogenesis

Kewalo Marine Laboratory, Pacific Biomedical Research Center, University of Hawai’i Honolulu, Hawaii 96813

^* To whom correspondence should be addressed. E-mail: mqmartin{at}hawaii.edu

Cell adhesion is a major aspect of cell biology and one of the fundamental processes involved in the development of a multicellular animal. Adhesive mechanisms, both cell-cell and between cell and extracellular matrix, are intimately involved in assembling cells into the three-dimensional structures of tissues and organs. The modulation of adhesive complexes could therefore be seen as a central component in the molecular control of morphogenesis, translating information encoded within the genome into organismal form. The availability of whole genomes from early-branching metazoa such as cnidarians is providing important insights into the evolution of adhesive processes by allowing for the easy identification of the genes involved in adhesion in these organisms. Discovery of the molecular nature of cell adhesion in the early-branching groups, coupled with comparisons across the metazoa, is revealing the ways evolution has tinkered with this vital cellular process in the generation of the myriad forms seen across the animal kingdom.

Abbreviations: AJ, adherens junction • EC, ectodomain • ECM, extracellular matrix • EMT, epithelial-to-mesenchymal transition • FA, focal adhesion • GJ, gap junction • MET, mesenchymal-to-epithelial transition • SJ, septate junction • TJ, tight junction • ZA, zonula adherens

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