[HTML][HTML] Roundabout controls axon crossing of the CNS midline and defines a novel subfamily of evolutionarily conserved guidance receptors

T Kidd, K Brose, KJ Mitchell, RD Fetter… - Cell, 1998 - cell.com
T Kidd, K Brose, KJ Mitchell, RD Fetter, M Tessier-Lavigne, CS Goodman, G Tear
Cell, 1998cell.com
The robo gene in Drosophila was identified in a large-scale mutant screen for genes that
control the decision by axons to cross the CNS midline. In robo mutants, too many axons
cross and recross the midline. Here we show that robo encodes an axon guidance receptor
that defines a novel subfamily of immunoglobulin superfamily proteins that is highly
conserved from fruit flies to mammals. For those axons that never cross the midline, Robo is
expressed on their growth cones from the outset; for the majority of axons that do cross the …
Abstract
The robo gene in Drosophila was identified in a large-scale mutant screen for genes that control the decision by axons to cross the CNS midline. In robo mutants, too many axons cross and recross the midline. Here we show that robo encodes an axon guidance receptor that defines a novel subfamily of immunoglobulin superfamily proteins that is highly conserved from fruit flies to mammals. For those axons that never cross the midline, Robo is expressed on their growth cones from the outset; for the majority of axons that do cross the midline, Robo is expressed at high levels on their growth cones only after they cross the midline. Transgenic rescue experiments reveal that Robo can function in a cell-autonomous fashion. Robo appears to function as the gatekeeper controlling midline crossing.
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