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Johnson, K.G., Ghose, A., Epstein, E., Lincecum, J., O'Connor, M.B., Van Vactor, D. (2004). Axonal heparan sulfate proteoglycans regulate the distribution and efficiency of the repellent slit during midline axon guidance.  Curr. Biol. 14(6): 499--504.
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FBrf0174485
Publication Type
Research paper
Abstract

The presentation of secreted axon guidance factors plays a major role in shaping central nervous system (CNS) connectivity. Recent work suggests that heparan sulfate (HS) regulates guidance factor activity; however, the in vivo axon guidance roles of its carrier proteins (heparan sulfate proteoglycans, or HSPGs) are largely unknown. Here we demonstrate through genetic analysis in vivo that the HSPG Syndecan (Sdc) is critical for the fidelity of Slit repellent signaling at the midline of the Drosophila CNS, consistent with the localization of Sdc to CNS axons. sdc mutants exhibit consistent defects in midline axon guidance, plus potent and specific genetic interactions supporting a model in which HSPGs improve the efficiency of Slit localization and/or signaling. To test this hypothesis, we show that Slit distribution is altered in sdc mutants and that Slit and its receptor bind to Sdc. However, when we compare the function of the transmembrane Sdc to a different class of HSPG that localizes to CNS axons (Dallylike), we find functional redundancy, suggesting that these proteoglycans act as spatially specific carriers of common HS structures that enable growth cones to interact with and perceive Slit as it diffuses away from its source at the CNS midline.

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    Language of Publication
    English
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    Parent Publication
    Publication Type
    Journal
    Abbreviation
    Curr. Biol.
    Title
    Current Biology
    Publication Year
    1991-
    ISBN/ISSN
    0960-9822
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