CRISAM - Inria Sophia Antipolis - Méditerranée , INRA - Institut National de la Recherche Agronomique, UMR AGAP - Amélioration génétique et adaptation des plantes méditerranéennes et tropicales
8BAMBOO - An algorithmic view on genomes, cells, and environments (Laboratoire de Biométrie et Biologie Évolutive. UMR CNRS 5558 Campus de La Doua - Université Claude Bernard - Lyon 1 Bâtiment Grégoire Mendel - 16 rue Raphael Dubois 69 100 Villeurbanne -- INRIA Grenoble - Rhône-Alpes Inovallée 655 avenue de l'Europe -Montbonnot 38 334 Saint Ismier Cedex France - France)
Abstract : The plant hormone auxin is thought to provide positional information for patterning during development. It is still unclear, however, precisely how auxin is distributed across tissues and how the hormone is sensed in space and time. The control of gene expression in response to auxin involves a complex network of over 50 potentially interacting transcriptional activators and repressors, the auxin response factors (ARFs) and Aux/IAAs. Here, we perform a large-scale analysis of the Aux/IAA-ARF pathway in the shoot apex of Arabidopsis, where dynamic auxin-based patterning controls organogenesis. A comprehensive expression map and full interactome uncovered an unexpectedly simple distribution and structure of this pathway in the shoot apex. A mathematical model of the Aux/IAA-ARF network predicted a strong buffering capacity along with spatial differences in auxin sensitivity. We then tested and confirmed these predictions using a novel auxin signalling sensor that reports input into the signalling pathway, in conjunction with the published DR5 transcriptional output reporter. Our results provide evidence that the auxin signalling network is essential to create robust patterns at the shoot apex.
https://hal.inria.fr/hal-00828880 Contributor : Christophe GodinConnect in order to contact the contributor Submitted on : Friday, May 31, 2013 - 4:51:35 PM Last modification on : Saturday, August 6, 2022 - 3:46:27 AM Long-term archiving on: : Sunday, September 1, 2013 - 7:10:23 AM
Teva Vernoux, Géraldine Brunoud, Etienne Farcot, Valérie Morin, Hilde van Den Daele, et al.. The auxin signalling network translates dynamic input into robust patterning at the shoot apex. Molecular Systems Biology, EMBO Press, 2011, 7 (508), ⟨10.1038/msb.2011.39⟩. ⟨hal-00828880⟩