Journal
CELL
Volume 125, Issue 1, Pages 33-45Publisher
CELL PRESS
DOI: 10.1016/j.cell.2006.03.002
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The establishment of left-right asymmetry in mammals is a good example of 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 cilia that are tilted toward the posterior on cells of the ventral node. These cilia are built by transport via the KIF3 motor complex. How nodal flow is interpreted to create left-right asymmetry has been a matter of debate. Recent evidence suggests that the leftward movement of membrane-sheathed particles, called nodal vesicular parcels (NVPs), may result in the activation of the noncanonical Hedgehog signaling pathway, an asymmetric elevation in intracellular Ca2+ and changes in gene expression.
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