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Related Experiment Videos

Localized calcium signals in early zebrafish development

E Reinhard1, H Yokoe, K R Niebling

  • 1Department of Neurobiology, Duke University Medical Center, Durham, North Carolina 27710, USA.

Developmental Biology
|July 1, 1995
PubMed
Summary

Calcium (Ca2+) spikes in zebrafish embryos originate in the enveloping layer (EVL) cells after the 32-cell stage. These Ca2+ signals are synchronized within EVL cell groups but do not predict embryonic polarity.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Zebrafish Embryogenesis

Background:

  • The phosphoinositide (PI) pathway is implicated in early embryonic development, including blastomere compaction and axis formation in various species.
  • Inositol 1,4,5-trisphosphate (IP3) levels rise after the 32-cell stage in zebrafish, suggesting a role for IP3-mediated calcium (Ca2+) signaling during the blastula stage.

Purpose of the Study:

  • To investigate the role and characteristics of Ca2+ signals in individual blastomeres of zebrafish embryos.
  • To understand the contribution of PI and Ca2+ signaling to early vertebrate embryogenesis.

Main Methods:

  • Utilized confocal imaging with a nuclear-localized Ca2+ indicator to measure Ca2+ concentration changes in individual zebrafish blastomeres over time.
  • Analyzed Ca2+ signals in serial sections of developing embryos to track their occurrence and distribution.

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Main Results:

  • Transient Ca2+ spikes (20-50 seconds) were first observed between the 32- and 128-cell stages in the outer embryonic cell layer, which differentiates into the enveloping layer (EVL).
  • No Ca2+ activity was detected in earlier cleavage cycles or in deep blastomeres; spikes were confined to the EVL throughout the blastula stage.
  • Neighboring EVL cells often exhibited synchronized Ca2+ spikes, indicating coordinated activity in small cell groups. Average Ca2+ activity was evenly distributed and did not correlate with future embryonic polarity.

Conclusions:

  • Ca2+ signaling, specifically in the form of synchronized spikes, is a feature of the developing enveloping layer in zebrafish embryos.
  • These Ca2+ dynamics in the EVL are established after the 32-cell stage and appear to be involved in cell specialization rather than polarity determination at this early stage.