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Establishment of left/right asymmetry in neuroblast migration by UNC-40/DCC, UNC-73/Trio and DPY-19 proteins in C. elegans.

Development. 2000 Nov;127(21):4655-68
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摘要


The bilateral C. elegans neuroblasts QL and QR are born in the same anterior/posterior (A/P) position, but polarize and migrate left/right asymmetrically: QL migrates toward the posterior and QR migrates toward the anterior. After their migrations, QL but not QR switches on the Hox gene mab-5. We find that the UNC-40/netrin receptor and a novel transmembrane protein DPY-19 are required to orient these cells correctly. In unc-40 or dpy-19 mutants, the Q cells polarize randomly; in fact, an individual Q cell polarizes in multiple directions over time. In addition, either cell can express MAB-5. Both UNC-40 and DPY-19, as well as the Trio/GTPase exchange factor homolog UNC-73, are required for full polarization and migration. Thus, these proteins appear to participate in a signaling system that orients and polarizes these migrating cells in a left/right asymmetrical fashion during development. The C. elegans netrin UNC-6, which guides many cells and axons along the dorsoventral axis, is not involved in Q cell polarization, suggesting that a different netrin-like ligand serves to polarize these cells along the anteroposterior axis.

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