Journal
NATURE CELL BIOLOGY
Volume 3, Issue 5, Pages E117-E123Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/35074643
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One of the principal functions of any epithelium in the embryonic or adult organism is to act as a self-sealing barrier layer. From the earliest stages of development, embryonic epithelia are required to close naturally occurring holes and to fuse wherever two free edges are brought together, and at the simplest level that is precisely what the epidermis must do to repair itself wherever it is damaged. Parallels can be drawn between the artificially triggered epithelial movements of wound repair and the naturally occurring epithelial movements that shape the embryo during morphogenesis. Recent in vitro end in vivo wound-healing studies and analysis of paradigm morphogenetic movements in genetically tractable embryos, like those of Drosophila and Caenorhabditis elegans, have begun to identify both the signals that initiate these movement's and the cytoskeletal machinery that drives motility. We are also gaining insight into the nature of the brakes and stop signals, and the mechanisms by which the confronting epithelial sheets knit together to form a seam.
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