Difference between revisions of "Long Range Dpp Gradient Formation"
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In a recent paper (for more details [http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001111 click here]), we developed a rigorous theoretical model which involves three Dpp components: extracellular Dpp, receptor-bound Dpp and internalized Dpp. Providing a different parameter choice, this model allows to describe both the RMT and RED mechanism. | In a recent paper (for more details [http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.1001111 click here]), we developed a rigorous theoretical model which involves three Dpp components: extracellular Dpp, receptor-bound Dpp and internalized Dpp. Providing a different parameter choice, this model allows to describe both the RMT and RED mechanism. | ||
| − | Comparing our analytical model to wild-type and receptor mutant clone experimental data, we conclude that | + | Comparing our analytical model to wild-type and receptor mutant clone experimental data, we conclude that \\ |
| − | + | (1) the RMT mechanism is not consistent with our experimental data\\ | |
| − | (1) the RMT mechanism is not consistent with our experimental data | ||
(2) a RED mechanism where most of the Dpp is unbound to the receptor leads to the expected Dpp profiles. | (2) a RED mechanism where most of the Dpp is unbound to the receptor leads to the expected Dpp profiles. | ||
Revision as of 15:44, 18 October 2011
Decapentaplegic (Dpp) is a key morphogen which is expressed in a stripe of cells along the anteriorposterior (A-P) boundary of the Drosophila wing imaginal discs and diffuses along the A-P axis forming, at steady-state, a "quasi exponential" profile.
The mechanisms by which this profile is formed has however long been controversal and two distinct mechanisms involving Dpp receptors have been proposed: Receptor-Mediated Transcytosis (RMT) and Restricted Extracellular Diffusion (RED).
In a recent paper (for more details click here), we developed a rigorous theoretical model which involves three Dpp components: extracellular Dpp, receptor-bound Dpp and internalized Dpp. Providing a different parameter choice, this model allows to describe both the RMT and RED mechanism. Comparing our analytical model to wild-type and receptor mutant clone experimental data, we conclude that \\ (1) the RMT mechanism is not consistent with our experimental data\\ (2) a RED mechanism where most of the Dpp is unbound to the receptor leads to the expected Dpp profiles.
