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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

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G1/S phase cyclin-dependent kinase overexpression perturbs early development and delays tissue-specific

Laurent Richard-Parpaillon1, Ruth A Cosgrove, Christine Devine

  • 1Department of Oncology, Cambridge University, Hutchison/MRC Research Centre, Addenbrookes Hospital, Hills Road, Cambridge CB2 2XZ, UK. ap113@cam.ac.uk

Development (Cambridge, England)
|April 30, 2004
PubMed

Insights

Overexpressing specific cell cycle proteins like cyclin E or cyclin A2 in Xenopus embryos disrupts normal development. Cyclin A2/cdk2 specifically impacts skin and neuron differentiation, showing tissue-specific effects on cell division and differentiation balance.

Area of Science:

  • Developmental Biology
  • Cell Cycle Regulation
  • Molecular Biology

Background:

  • Cell division and differentiation are critical for development but are generally considered incompatible processes.
  • The molecular mechanisms linking cell division and differentiation remain poorly understood.
  • Understanding these links is crucial for comprehending early vertebrate development.

Purpose of the Study:

  • To investigate the effects of overexpressing G1/S phase cyclins and cyclin-dependent kinases (cdks) on early Xenopus embryo development and differentiation.
  • To determine the specific roles of cyclin E and cyclin A2 in the context of cell cycle control and developmental processes.

Main Methods:

  • Overexpression of G1/S phase cyclins (cyclin E, cyclin A2) and associated cyclin-dependent kinases (cdk2) in Xenopus embryos.
  • Observation of developmental outcomes, including nuclear DNA content, apoptosis, proliferation, and differentiation.
  • Analysis of tissue-specific responses to cyclin/cdk overexpression at various developmental stages.

Main Results:

  • Overexpression of cyclin E before the midblastula transition (MBT) led to DNA loss and apoptosis at early gastrula stages.
  • Overexpressed cyclin A2, especially when stabilized with cdk2, persisted to later stages without affecting early development.
  • Post-MBT overexpression of cyclin A2/cdk2 induced epidermal proliferation, disrupted skin architecture, and delayed differentiation.
  • Ectopic cyclin A2/cdk2 inhibited primary neuron differentiation but not muscle differentiation.

Conclusions:

  • Overexpression of G1/S phase cyclin/cdk pairs can disrupt the balance between cell division and differentiation in early vertebrate embryos.
  • The effects of cyclin/cdk overexpression are tissue-specific, impacting processes like skin and neuronal differentiation.
  • This study highlights the complex interplay between cell cycle regulation and developmental patterning.

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