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Different levels of the Tripartite motif protein, Anomalies in sensory axon patterning (Asap), regulate distinct axonal projections of Drosophila sensory neurons
- Publication Year :
- 2011
- Publisher :
- National Academy of Sciences, 2011.
-
Abstract
- The axonal projection pattern of sensory neurons typically is regulated by environmental signals, but how different sensory afferents can establish distinct projections in the same environment remains largely unknown. Drosophila class IV dendrite arborization (C4da) sensory neurons project subtype-specific axonal branches in the ventral nerve cord, and we show that the Tripartite motif protein, Anomalies in sensory axon patterning (Asap) is a critical determinant of the axonal projection patterns of different C4da neurons. Asap is highly expressed in C4da neurons with both ipsilateral and contralateral axonal projections, but the Asap level is low in neurons that have only ipsilateral projections. Mutations in asap cause a specific loss of contralateral projections, whereas overexpression of Asap induces ectopic contralateral projections in C4da neurons. We also show by biochemical and genetic analysis that Asap regulates Netrin signaling, at least in part by linking the Netrin receptor Frazzled to the downstream effector Pico. In the absence of Asap, the sensory afferent connectivity within the ventral nerve cord is disrupted, resulting in specific larval behavioral deficits. These results indicate that different levels of Asap determine distinct patterns of axonal projections of C4da neurons by modulating Netrin signaling and that the Asap-mediated axonal projection is critical for assembly of a functional sensory circuit.
- Subjects :
- Sensory Receptor Cells
Neurogenesis
Sensory system
Nerve Tissue Proteins
Receptors, Cell Surface
Biology
Tripartite Motif
Two-Hybrid System Techniques
Netrin
medicine
Animals
Drosophila Proteins
Immunoprecipitation
Axon
Multidisciplinary
Effector
fungi
Biological Sciences
Axons
medicine.anatomical_structure
Sensory afferents
nervous system
Ventral nerve cord
Dendrite Arborization
Drosophila
Netrin Receptors
Neuroscience
Signal Transduction
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....6781819a32635209a6e30d6757b44138