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In vertebrates, commissural axons extend ventrally toward the floor plate in the spinal cord and hindbrain. Netrin-1, secreted by floor plate cells, was proposed to attract commissural axons at a distance. However, recent genetic studies in mice have shown that netrin-1 is also produced by ventricular zone (VZ) progenitors and that in the hindbrain, it represents the main source of netrin-1 for commissural axons. Here, we show that genetically deleting netrin-1 either from the VZ or the floor plate does not prevent midline crossing in the spinal cord, although axon pathfinding and fasciculation are perturbed. Strikingly, the VZ and floor plate act synergistically, as the simultaneous ablation of netrin-1 from these two sources severely impedes crossing. These results suggest that floor-plate-derived netrin-1 has a distinct impact on commissural axons in the spinal cord and hindbrain.
Pubmed ID: 30661739 RIS Download
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