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Conditional Aurora A deficiency differentially affects early mouse embryo patterning.

Yeonsoo Yoon1, Dale O Cowley, Judith Gallant

  • 1Department of Cell and Developmental Biology, University of Massachusetts Medical School, Worcester, MA 01655, USA.

Developmental Biology
|September 4, 2012
PubMed
Summary

Ablating Aurora A kinase in mouse embryos causes developmental defects and lethality. Tissue-specific inactivation reveals distinct roles in gastrulation and axis elongation, impacting embryo patterning.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Aurora A kinase is crucial for cell division and proliferation.
  • Previous studies showed Aurora A ablation causes early embryonic lethality in mice.
  • Limited understanding of Aurora A's role in post-implantation development and tissue patterning.

Purpose of the Study:

  • Investigate the impact of Aurora A ablation on early post-implantation mouse embryo patterning.
  • Determine tissue-specific effects of Aurora A inactivation on embryonic development.
  • Explore the potential of Aurora A mutant embryos for stem cell potency assays.

Main Methods:

  • Conditional inactivation of Aurora A in specific embryonic tissues (epiblast, visceral endoderm).
  • Analysis of embryo patterning, gastrulation, and anteroposterior axis formation.

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  • In vitro studies involving injection of embryonic stem (ES) cells into mutant blastocysts.

    • Main Results:

    • Aurora A inactivation in epiblast or visceral endoderm leads to apoptosis, growth inhibition, and lethality around E9.5.
    • Epiblast-specific ablation disrupts gastrulation but maintains anteroposterior axis establishment.
    • Visceral endoderm-specific ablation results in posteriorization or failure of axis elongation.
    • Extra-embryonic tissues in epiblast mutants support development to organogenesis stages.

    Conclusions:

    • Aurora A plays critical, context-dependent roles in embryonic patterning and gastrulation.
    • Tissue-specific ablation of Aurora A offers insights into developmental processes.
    • Aurora A mutant embryos serve as a model for studying stem cell potency and tissue development.