title: Reiterative use of signalling pathways controls multiple cellular events during Drosophila posterior spiracle organogenesis.
abstract: Organogenesis proceeds in multiple steps and events that need to be coordinated in time and space. Yet the genetic and molecular control of such coordination remains poorly understood. In this study we have investigated the contribution of three signalling pathways, Wnt/Wingless (Wg), Hedgehog (Hh), and epidermal growth factor receptor (EGFR), to posterior spiracle morphogenesis, an organ that forms under Abdominal-B (AbdB) control in the eighth abdominal segment. Using targeted signalling inactivation, we show that these pathways are reiteratively used to control multiple cellular events during posterior spiracle organogenesis, including cell survival and maintenance of cell polarity and adhesion required for tissue integrity. We propose that the reiterative use of the Wg, Hh, and EGFR signalling pathways serves to coordinate in time and space the sequential deployment of events that collectively allow proper organogenesis.
authors.affiliation: Institut de Biologie du Développement de Marseille Luminy, IBDML, CNRS, Université de la Méditerranée, Parc Scientifique de Luminy, Case 907 13288 Marseille Cedex 09, France. czaffran@ibdm.univ-mrs.fr
authors.forename: Corinne
authors.initials: C
authors.lastname: Maurel-Zaffran
authors.forename: Jacques
authors.initials: J
authors.lastname: Pradel
authors.forename: Yacine
authors.initials: Y
authors.lastname: Graba
mesh_terms: D000818:Animals; D019521:Body Patterning; D004330:Drosophila / Q000196:embryology* / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism; D004625:Embryo, Nonmammalian / Q000378:metabolism*; D066246:ErbB Receptors / Q000235:genetics / Q000378:metabolism; D053823:Hedgehog Proteins / Q000235:genetics / Q000378:metabolism; D038081:Organogenesis; D015398:Signal Transduction; D051153:Wnt Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: D029721:Drosophila Proteins; D053823:Hedgehog Proteins; D051153:Wnt Proteins; D066246:ErbB Receptors