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The Journal of Neuroscience, March 28, 2007, 27(13):3584-3592; doi:10.1523/JNEUROSCI.0301-07.2007
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Development/Plasticity/Repair
Independent Functions of Slit–Robo Repulsion and Netrin–Frazzled Attraction Regulate Axon Crossing at the Midline in Drosophila
David S. Garbe andGreg J. Bashaw 1Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
Correspondence should be addressed to Greg J. Bashaw, Department of Neuroscience, University of Pennsylvania School of Medicine, 1113 BRB2/3, 421 Curie Boulevard, Philadelphia, PA 19104. Email: gbashaw{at}mail.med.upenn.edu
Slit and Netrin and their respective neuronal receptors play critical roles in patterning axonal connections in the developing nervous system by regulating the decision of whether or not to cross the midline. Studies of both invertebrate and vertebrate systems support the idea that Netrin, secreted by midline cells, signals through DCC (Deleted in Colorectal Carcinoma)/UNC40/Frazzled receptors to attract commissural axons toward and across the midline, whereas Slit signals through Robo family receptors to prevent commissural axons from recrossing the midline, as well as to prevent ipsilateral axons from ever crossing. Recent evidence from both Xenopus neuronal cell culture and Drosophila genetics have suggested that these signals may interact more directly in a hierarchical relationship, such that one response extinguishes the other. Here we present loss- and gain-of-function genetic evidence showing that the influence of Slit and Netrin on midline axon crossing is dictated by both independent and interdependent signaling functions of the Robo and Frazzled (Fra) receptors. Our results are not consistent with the proposal based on genetic analysis in Drosophila that the sole function of Slit and Robo during midline guidance is to repress Netrin attraction.
Key words: axon guidance; midline; repulsion; attraction; Slit; Robo; Netrin; DCC/Frazzled
Received Dec. 15, 2006; revised Feb. 27, 2007; accepted Feb. 27, 2007.
Correspondence should be addressed to Greg J. Bashaw, Department of Neuroscience, University of Pennsylvania School of Medicine, 1113 BRB2/3, 421 Curie Boulevard, Philadelphia, PA 19104. Email: gbashaw{at}mail.med.upenn.edu
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