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Myelin inhibitors of axonal regeneration, like Nogo and MAG, block regrowth after injury to the adult CNS. While a GPI-linked receptor for Nogo (NgR) has been identified, MAG's receptor is unknown. We show that MAG inhibits regeneration by interaction with NgR. Binding of and inhibition by MAG are lost if neuronal GPI-linked proteins are cleaved. Binding of MAG to NgR-expressing cells is GPI dependent...
Here we report the identification of Dfz3, a novel member of the Frizzled family of seven-pass transmembrane receptors. Like Dfz2, Dfz3 is a target gene of Wingless (Wg) signalling, but in contrast to Dfz2, it is activated rather than repressed by Wg signalling in imaginal discs. We show that Dfz3 is not required for viability but is necessary for optimal Wg signalling at the wing margin.
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