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Science 18 March 2005:
Vol. 307. no. 5716, pp. 1785 - 1789
DOI: 10.1126/science.1104751
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Reports

Extrusion and Death of DPP/BMP-Compromised Epithelial Cells in the Developing Drosophila Wing

Matthew C. Gibson and Norbert Perrimon*

During animal development, epithelial cell fates are specified according to spatial position by extracellular signaling pathways. Among these, the transforming growth factor ß/bone morphogenetic protein (TGF-ß/BMP) pathways are evolutionarily conserved and play crucial roles in the development and homeostasis of a wide range of multicellular tissues. Here we show that in the developing Drosophila wing imaginal epithelium, cell clones deprived of the BMP-like ligand Decapentaplegic (DPP) do not die as previously thought but rather extrude from the cell layer as viable cysts exhibiting marked abnormalities in cell shape and cytoskeletal organization. We propose that in addition to assigning cell fates, a crucial developmental function of DPP/BMP signaling is the position-specific control of epithelial architecture.

Department of Genetics and Howard Hughes Medical Institute, Harvard Medical School, Boston, MA 02115, USA.

* To whom correspondence should be addressed. E-mail: perrimon{at}receptor.med.harvard.edu

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