Left-right determination: involvement of molecular motor KIF3, cilia, and nodal flow
- PMID: 20066075
- PMCID: PMC2742083
- DOI: 10.1101/cshperspect.a000802
Left-right determination: involvement of molecular motor KIF3, cilia, and nodal flow
Abstract
Mammalian left-right determination is a good example for how multiple cell biological processes coordinate in the formation of a basic body plan. The leftward movement of fluid at the ventral node, called nodal flow, is the central process in symmetry breaking on the left-right axis. Nodal flow is autonomously generated by the rotation of posteriorly tilted cilia that are built by transport via KIF3 motor on cells of the ventral node. How nodal flow is interpreted to create left-right asymmetry has been a matter of debate. Recent evidence suggests that the leftward movement of sheathed lipidic particles, called nodal vesicular parcels (NVPs), may result in the activation of the noncanonical hedgehog signaling pathway, an asymmetric elevation in intracellular Ca(2+) and changes in gene expression.
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