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Cell cycle remodeling requires cell-cell interactions in developing Xenopus embryos

D L Frederick1, M T Andrews

  • 1Department of Genetics, North Carolina State University, Raleigh 27695-7614.

The Journal of Experimental Zoology
|November 15, 1994
PubMed
Summary
This summary is machine-generated.

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Cell cycle remodeling in developing Xenopus embryos shifts from S phase to G1. This developmental shift requires cell community interactions, not an intact embryo structure.

Area of Science:

  • Developmental Biology
  • Cell Cycle Regulation
  • Xenopus laevis embryogenesis

Background:

  • The cell cycle undergoes significant changes during embryonic development.
  • Understanding cell cycle regulation is crucial for comprehending developmental processes.

Purpose of the Study:

  • To investigate the remodeling of the cell cycle during Xenopus embryogenesis.
  • To determine the role of cell-cell interactions in cell cycle progression.

Main Methods:

  • Flow cytometric analysis of cell cycle phases (G1, S, G2/M).
  • Observation of Xenopus embryos at various developmental stages (gastrulation to tailbud).
  • Comparison of cell cycle profiles in intact, loosely associated, and widely dispersed cells.

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Main Results:

  • Early Xenopus embryos exhibit an S phase-dominated cell cycle (82% in S phase).
  • Cell cycle shifts towards G1 dominance (85% in G1) by the late tailbud stage.
  • Dissociated cells in close proximity remodel their cell cycle, while widely dispersed cells do not.
  • Dispersed cells maintain blastula/gastrula gene expression patterns beyond normal developmental timing.

Conclusions:

  • Cell cycle remodeling in Xenopus development is dependent on community-based inductive signals.
  • Cell-cell proximity, not necessarily an intact embryo, is essential for normal cell cycle progression.
  • Disruption of cell community leads to a sustained, undifferentiated cell cycle state.