Using a multicellular model, maintanence of vascular patterning in Arabidopsis roots has been studied. The model that is provided here is the single-cell version of the model. The two-cell and multicellular models described in the paper can be downloaded as python scripts (follow the curation tab to get these files).
This model is described in the article:
Abstract:
As multicellular organisms grow, positional information is continually needed to regulate the pattern in which cells are arranged. In the Arabidopsis root, most cell types are organized in a radially symmetric pattern; however, a symmetry-breaking event generates bisymmetric auxin and cytokinin signaling domains in the stele. Bidirectional cross-talk between the stele and the surrounding tissues involving a mobile transcription factor, SHORT ROOT (SHR), and mobile microRNA species also determines vascular pattern, but it is currently unclear how these signals integrate. We use a multicellular model to determine a minimal set of components necessary for maintaining a stable vascular pattern. Simulations perturbing the signaling network show that, in addition to the mutually inhibitory interaction between auxin and cytokinin, signaling through SHR, microRNA165/6, and PHABULOSA is required to maintain a stable bisymmetric pattern. We have verified this prediction by observing loss of bisymmetry in shr mutants. The model reveals the importance of several features of the network, namely the mutual degradation of microRNA165/6 and PHABULOSA and the existence of an additional negative regulator of cytokinin signaling. These components form a plausible mechanism capable of patterning vascular tissues in the absence of positional inputs provided by the transport of hormones from the shoot.
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Integration of hormonal signaling networks and mobile microRNAs is required for vascular patterning in Arabidopsis roots.
- Daniele Muraro, Nathan Mellor, Michael P Pound, Hanna Help, Mikaël Lucas, Jérôme Chopard, Helen M Byrne, Christophe Godin, T Charlie Hodgman, John R King, Tony P Pridmore, Ykä Helariutta, Malcolm J Bennett, Anthony Bishopp
- Proceedings of the National Academy of Sciences of the United States of America , 1/ 2014 , Volume 111 , Issue 2 , pages: 857-862 , PubMed ID: 24381155
Submitter of this revision: Lucian Smith
Curator: Lucian Smith
Modellers: administrator, Vijayalakshmi Chelliah
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