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Hiramoto, M., Hiromi, Y. (2006). ROBO directs axon crossing of segmental boundaries by suppressing responsiveness to relocalized Netrin.  Nat. Neurosci. 9(1): 58--66.
FlyBase ID
FBrf0191279
Publication Type
Research paper
Abstract
Networks in the CNS consist of neural modules that are connected in a repetitive array. Whereas individual modules contain guidance information along which axons track within the unit, these guidance cues hinder axon extension across module boundaries. We investigated how axons solve this 'boundary problem' by analyzing the longitudinal connections of neuromeres in Drosophila melanogaster. The initial trajectory of the longitudinal axons is guided by Netrin, which is localized on commissural axons by its receptor, Frazzled. The Netrin cue on the commissure of the next segment can act as a barrier to longitudinal axons, inhibiting their extension and misguiding them contralaterally along the commissure. We show that, before reaching the segmental boundary, the longitudinal axons' responsiveness to Netrin presented on the commissure is suppressed by Roundabout (ROBO), through counteracting Gq signaling. The absence of suppression causes the robo phenotype: longitudinal axons project toward the midline, as if running around a roundabout (rotary).
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    Language of Publication
    English
    Additional Languages of Abstract
    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Nat. Neurosci.
    Title
    Nature Neuroscience
    Publication Year
    1998-
    ISBN/ISSN
    1097-6256
    Data From Reference