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Ca2+ signalling and early embryonic patterning during zebrafish development.

Sarah E Webb1, Andrew L Miller

  • 1Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Clinical and Experimental Pharmacology & Physiology
|July 25, 2007
PubMed
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Calcium (Ca2+) signaling, as waves and gradients, is vital for early vertebrate development. This review highlights Ca2+ transients in zebrafish embryos, crucial for cell movements, axis formation, and tissue patterning.

Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Embryogenesis

Background:

  • Calcium (Ca2+) signaling in pulses, waves, and gradients is hypothesized to be crucial for pattern formation in early vertebrate development.
  • Early development transforms a single-cell zygote into a complex embryo with defined germ layers and body axes.

Purpose of the Study:

  • To review Ca2+ transients during zebrafish (Danio rerio) embryonic development from cleavage to segmentation.
  • To propose the role of intracellular and intercellular Ca2+ waves in key developmental processes.

Main Methods:

  • Review of existing literature on Ca2+ transients in zebrafish embryos.
  • Analysis of Ca2+ wave propagation (intracellular and intercellular) during early development.

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Main Results:

  • Intracellular Ca2+ waves are essential for embryonic cytokinesis.
  • Intercellular Ca2+ waves are critical for establishing the embryonic periderm, coordinating cell movements (epiboly, convergence, extension), forming embryonic axes and germ layers, and defining tissue boundaries.

Conclusions:

  • Ca2+ waves play a fundamental role in pattern formation during early zebrafish development.
  • Downstream targets of Ca2+ transients and their integration with other signaling pathways warrant further investigation.