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GCN2 activation and eIF2alpha phosphorylation in the maturation of mouse oocytes

Viviane S Alves1, Fabiana L Motta, Martín Roffé

  • 1Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, 862 04023-062 São Paulo, SP, Brazil.

Biochemical and Biophysical Research Communications
|November 11, 2008
PubMed

Insights

The GCN2 kinase is highly active in unfertilized mouse eggs, phosphorylating eIF2alpha. This activity significantly decreases after fertilization, suggesting a role in oocyte maturation.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Developmental Biology

Background:

  • GCN2 is a mammalian kinase that regulates protein synthesis under stress.
  • It phosphorylates the alpha subunit of the translation initiation factor 2 (eIF2alpha).
  • GCN2 plays roles in metabolism, feeding behavior, and memory in rodents.

Purpose of the Study:

  • To investigate the role and activity of GCN2 in unfertilized mouse eggs.
  • To determine the changes in GCN2 activity and eIF2alpha phosphorylation upon fertilization.

Main Methods:

  • Quantitative analysis of GCN2 transcript and protein levels.
  • Assessment of GCN2 kinase activity.
  • Measurement of phosphorylated eIF2alpha levels in oocytes before and after fertilization.

Main Results:

  • The beta isoform of the GCN2 transcript and protein are highly abundant in unfertilized mouse eggs compared to other cells.
  • GCN2 is active in unfertilized eggs, leading to elevated phosphorylated eIF2alpha levels.
  • Fertilization causes a drastic decrease in eIF2alpha phosphorylation.

Conclusions:

  • GCN2-mediated translational control is highly active in unfertilized mouse eggs.
  • This activity is significantly reduced post-fertilization.
  • GCN2 likely plays a crucial role in the regulatory mechanisms of oocyte maturation.

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