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vab-8 is a key regulator of posteriorly directed migrations in C. elegans and encodes a novel protein with kinesin motor similarity.

Neuron. 1998 Apr;20(4):655-66
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摘要


Nervous system assembly requires the directed migrations of cells and axon growth cones along the dorsoventral and anteroposterior axes. Although guidance mechanisms for dorsoventral migrations are conserved from nematodes to mammals, mechanisms for anteroposterior migrations are unknown. In C. elegans, the gene vab-8, which specifically functions in posteriorly directed migrations, encodes two isoforms of a novel intracellular protein that act cell-autonomously in different migrations. VAB-8L, which contains a domain similar to kinesin-like motors, functions in all vab-8-dependent axon growth cone migrations. VAB-8S, which lacks this N-terminal domain, functions in a subset of vab-8-dependent cell migrations. Continuous expression of VAB-8L in the ALM mechanosensory neuron, which normally requires vab-8 early in its development for posteriorly directed cell migration, redirects its anteriorly projecting axon posteriorly. We propose that regulation of vab-8 activity is a mechanism for controlling the direction of cell and axon growth cone migrations.

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