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Submitted on October 18, 2002
Accepted on January 24, 2003
Forces for Morphogenesis Investigated with Laser Microsurgery and Quantitative Modeling
M. Shane Hutson 1,Yoichiro Tokutake 1,Ming-Shien Chang 2,James W. Bloor 3,Stephanos Venakides 4,Daniel P. Kiehart 5*,Glenn S. Edwards 6*
1 Department of Physics and Free Electron Laser Laboratory, Duke University, Durham, NC 27708, USA. 2 Department of Physics and Free Electron Laser Laboratory, Duke University, Durham, NC 27708, USA; Present Address: School of Physics, Georgia Institute of Technology, Atlanta, GA 30332, USA. 3 Department of Biology, Duke University, Durham, NC 27708, USA; Present Address: Research School of Biosciences, University of Kent, Canterbury, Kent, CT2 7NJ, United Kingdom. 4 Department of Mathematics, Duke University, Durham, NC 27708, USA. 5 Department of Biology, Duke University, Durham, NC 27708, USA. 6 Department of Physics and Free Electron Laser Laboratory, Duke University, Durham, NC 27708, USA.
* To whom correspondence should be addressed. E-mail: dkiehart{at}duke.edu, edwards{at}fel.duke.edu.
We investigate forces that connect the genetic program of developmentto morphogenesis in Drosophila. We focus on dorsal closure,a powerful model system for development and wound healing. Wefind that the bulk of progress towards closure is driven bycontractility in supracellular purse-strings and the amnioserosa,while adhesion-mediated zipping coordinates the forces producedby the purse-strings and is essential only for the end stages.We apply quantitative modeling to show that these forces, generatedin distinct cells, are coordinated in space and synchronizedin time. Modeling of wild-type and mutant phenotypes is predictive;although closure in myospheroid mutants ultimately fails whenthe cell sheets rip themselves apart, our analysis indicatesthat PS-integrin has an earlier, significant role in zipping.
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