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Related Experiment Videos

Calcium at fertilization and in early development.

Michael Whitaker1

  • 1Institute of Cell & Molecular Biosciences, Faculty of Medical Sciences, University of Newcastle, Newcastle upon Tyne NE2 4HH, UK. michael.whitaker@ncl.ac.uk

Physiological Reviews
|December 24, 2005
PubMed
Summary

Fertilization calcium waves, essential for cell division and embryonic development, are initiated differently in invertebrates and mammals. These calcium signals regulate cell cycle, meiosis, and pattern formation throughout early embryogenesis.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Reproductive Biology

Background:

  • Fertilization triggers calcium waves, crucial for initiating embryonic development.
  • Understanding the mechanisms of these calcium waves is key to comprehending early embryogenesis.

Purpose of the Study:

  • To review and present evidence for general mechanisms of fertilization calcium waves.
  • To investigate the role of calcium signaling in cell cycle control and early embryonic patterning.

Main Methods:

  • Review of existing literature on fertilization calcium waves and their signaling pathways.
  • Analysis of evidence for calcium's role in cell division, meiosis, and morphogenesis.
  • Examination of endoplasmic reticulum dynamics and cytoskeleton interactions.

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Main Results:

  • Fertilization calcium wave initiation differs: invertebrates via sperm-activating substance, mammals via sperm-specific phospholipase C diffusion.
  • Calcium signals are essential for all stages of cell division in early embryos.
  • Calcium signaling is vital for oocyte maturation, pattern formation, and organogenesis.

Conclusions:

  • Calcium waves are fundamental to fertilization, cell cycle regulation, and embryonic development.
  • Phosphoinositide/calcium signaling is necessary for meiotic resumption.
  • Dynamic changes in calcium signaling machinery and endoplasmic reticulum facilitate these crucial developmental processes.