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Dissection and Lateral Mounting of Zebrafish Embryos: Analysis of Spinal Cord Development

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Na,K-ATPase alpha2 and Ncx4a regulate zebrafish left-right patterning.

Xiaodong Shu¹, Jie Huang, Yuan Dong

¹Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA 90095, USA.

Development (Cambridge, England)

|April 20, 2007

Summary

Sodium-potassium ATPase alpha2 and Ncx4a are crucial for breaking left-right symmetry in zebrafish. These proteins regulate ion transport in Kupffer

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Area of Science:

Developmental Biology
Cellular Physiology

Background:

Left-right (LR) asymmetry patterning in vertebrates is conserved but the initial symmetry breaking mechanisms remain poorly understood.
Nodal signaling is a known pathway for laterality patterning, but upstream regulators are under investigation.

Purpose of the Study:

To investigate the roles of Na,K-ATPase alpha2 and Ncx4a in the early stages of left-right (LR) symmetry breaking in zebrafish.
To elucidate the molecular mechanisms by which these proteins influence LR patterning.

Main Methods:

Knockdown of Na,K-ATPase alpha2 and Ncx4a in zebrafish dorsal forerunner cells (DFCs).
High-speed videomicroscopy and bead implantation to assess Kupffer's vesicle (KV) ciliary function and fluid flow.
Measurement of intracellular calcium levels.

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Analysis of Gene Function and Visualization of Cilia-Generated Fluid Flow in Kupffer's Vesicle

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Inhibition of Ca(2+)/calmodulin-dependent protein kinase II.

Main Results:

Na,K-ATPase alpha2 and Ncx4a knockdown in DFCs disrupts asymmetric gene expression and randomizes organ placement.
KV cilia immobility and abolished directional fluid flow were observed in morphants.
Elevated intracellular calcium levels were detected, and these defects were partially rescued by inhibiting Ca(2+)/calmodulin-dependent protein kinase II.

Conclusions:

Na,K-ATPase alpha2 and Ncx4a are essential for LR patterning in zebrafish, acting upstream of Nodal signaling.
These proteins regulate KV ciliary function and fluid flow by modulating intracellular calcium levels.
Calcium signaling plays a critical, previously unrecognized role in the initial break of LR symmetry.