Differentially Expressed Drl and Drl-2 Play Opposing Roles in Wnt5 Signaling duringDrosophilaOlfactory System Development
| Autor: | Shingo Yoshikawa, Kei Ito, Kyoko Ishikawa, Chihiro Hama, Linda A. Santschi, John B. Thomas, Masao Sakurai, Tomoko Aoki, Ken-ichi Kimura, Keita Endo, Hiroko Saito |
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| Rok vydání: | 2009 |
| Předmět: |
Olfactory system
animal structures Neurite Biology behavioral disciplines and activities Article Animals Genetically Modified Proto-Oncogene Proteins medicine Animals Drosophila Proteins Olfactory receptor musculoskeletal neural and ocular physiology General Neuroscience Gene Expression Regulation Developmental Receptor Protein-Tyrosine Kinases Olfactory Pathways Phenotype Smell Wnt Proteins medicine.anatomical_structure Mutation Neuroglia Drosophila Antennal lobe Signal transduction Neuroscience psychological phenomena and processes Drosophila Protein Signal Transduction |
| Zdroj: | The Journal of Neuroscience. 29:4972-4980 |
| ISSN: | 1529-2401 0270-6474 |
| Popis: | InDrosophila, odor information received by olfactory receptor neurons (ORNs) is processed by glomeruli, which are organized in a stereotypic manner in the antennal lobe (AL). This glomerular organization is regulated by Wnt5 signaling. In the embryonic CNS, Wnt5 signaling is transduced by the Drl receptor, a member of the Ryk family. During development of the olfactory system, however, it is antagonized by Drl. Here, we identify Drl-2 as a receptor mediating Wnt5 signaling. Drl is found in the neurites of brain cells in the AL and specific glia, whereas Drl-2 is predominantly found in subsets of growing ORN axons. Adrl-2mutation produces only mild deficits in glomerular patterning, but when it is combined with adrlmutation, the phenotype is exacerbated and more closely resembles theWnt5phenotype. Wnt5 overexpression in ORNs induces aberrant glomeruli positioning. This phenotype is ameliorated in thedrl-2mutant background, indicating that Drl-2 mediates Wnt5 signaling. In contrast, forced expression of Drl-2 in the glia ofdrlmutants rescues the glomerular phenotype caused by the loss of antagonistic Drl function. Therefore, Drl-2 can also antagonize Wnt5 signaling. Additionally, our genetic data suggest that Drl localized to developing glomeruli mediates Wnt5 signaling. Thus, these two members of the Ryk family are capable of carrying out a similar molecular function, but they can play opposing roles in Wnt5 signaling, depending on the type of cells in which they are expressed. These molecules work cooperatively to establish the olfactory circuitry inDrosophila. |
| Databáze: | OpenAIRE |
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