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Forces for Morphogenesis Investigated with Laser Microsurgery and Quantitative Modeling
M. Shane Hutson,1Yoichiro Tokutake,1Ming-Shien Chang,1*James W. Bloor,2Stephanos Venakides,3Daniel P. Kiehart,2§Glenn S. Edwards1§
We investigated the forces that connect the genetic
program of development to morphogenesis in Drosophila. We
focused on dorsalclosure, a powerful model system for development and
wound healing.We found that the bulk of progress toward closure is
driven bycontractility in supracellular "purse strings" and in the
amnioserosa,whereas adhesion-mediated zipping coordinates the forces
producedby the purse strings and is essential only for the end stages.We applied quantitative modeling to show that these forces, generatedin distinct cells, are coordinated in space and synchronized intime.
Modeling of wild-type and mutant phenotypes is predictive;although
closure in myospheroid mutants ultimately fails whenthe
cell sheets rip themselves apart, our analysis indicates thatPS integrin has an earlier, important role in zipping.
1 Department of Physics and Free Electron Laser
Laboratory,
2 Department of Biology,
3 Department of Mathematics, Duke University,
Durham, NC 27708, USA.
*
Present address: School of Physics, Georgia Institute of
Technology, Atlanta, GA 30332, USA.
Present address: Research School of Biosciences,
University of Kent, Canterbury, Kent CT2 7NJ, UK.
These authors contributed equally to this work.
§
To whom correspondence should be addressed. E-mail:
dkiehart{at}duke.edu (D.P.K.); edwards{at}fel.duke.edu (G.S.E.)
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