RRC ID 11671
Author Malartre M, Ayaz D, Amador FF, Martín-Bermudo MD.
Title The guanine exchange factor vav controls axon growth and guidance during Drosophila development.
Journal J Neurosci
Abstract The Vav proteins are guanine exchange factors (GEFs) that trigger the activation of the Rho GTPases in general and the Rac family in particular. While the role of the mammalian vav genes has been extensively studied in the hematopoietic system and the immune response, there is little information regarding the role of vav outside of these systems. Here, we report that the single Drosophila vav homolog is ubiquitously expressed during development, although it is enriched along the embryonic ventral midline and in the larval eye discs and brain. We have analyzed the role that vav plays during development by generating Drosophila null mutant alleles. Our results indicate that vav is required during embryogenesis to prevent longitudinal axons from crossing the midline. Later on, during larval development, vav is required within the axons to regulate photoreceptor axon targeting to the optic lobe. Finally, we demonstrate that adult vav mutant escapers, which exhibit coordination problems, display axon growth defects in the ellipsoid body, a brain area associated with locomotion control. In addition, we show that vav interacts with other GEFs known to act downstream of guidance receptors. Thus, we propose that vav acts in coordination with other GEFs to regulate axon growth and guidance during development by linking guidance signals to the cytoskeleton via the modulation of Rac activity.
Volume 30(6)
Pages 2257-67
Published 2010-2-10
DOI 10.1523/JNEUROSCI.1820-09.2010
PII 30/6/2257
PMID 20147552
PMC PMC6634040
MeSH Animals Axons / physiology* Body Patterning Cell Differentiation Cell Movement Central Nervous System / embryology Central Nervous System / growth & development Central Nervous System / metabolism Central Nervous System / ultrastructure Drosophila / embryology Drosophila / growth & development Drosophila / ultrastructure* Larva / growth & development Larva / metabolism Larva / ultrastructure Mutation Neuroglia / cytology Neuroglia / metabolism Photoreceptor Cells, Invertebrate / metabolism Photoreceptor Cells, Invertebrate / ultrastructure Proto-Oncogene Proteins c-vav / biosynthesis Proto-Oncogene Proteins c-vav / genetics Proto-Oncogene Proteins c-vav / physiology*
IF 6.074
Times Cited 17
Drosophila vav[11837] FRT19A