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A deadenylation negative feedback mechanism governs meiotic metaphase arrest

Eulàlia Belloc1, Raúl Méndez

  • 1Centre for Genomic Regulation (CRG), Pompeu Fabra University (UPF), C/Dr Aiguader 88, 08003, Barcelona, Spain.

Nature
|April 4, 2008
PubMed

Insights

Meiotic progression in oocytes relies on timed mRNA translation, controlled by polyadenylation and deadenylation. This study identifies C3H-4, a protein that regulates mRNA deadenylation, ensuring proper meiotic phase transitions.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Meiotic progression in vertebrate oocytes depends on the regulated translation of maternal mRNAs.
  • Cytoplasmic polyadenylation, mediated by cytoplasmic polyadenylation elements (CPEs), is crucial for activating mRNA translation during oocyte maturation.
  • This process is essential for activating the maturation-promoting factor and entry into meiotic phases MI and MII.

Purpose of the Study:

  • To identify novel mRNAs that undergo cytoplasmic polyadenylation during meiotic phase transitions.
  • To investigate the role of newly identified regulatory elements and proteins in controlling mRNA translation during meiosis.
  • To elucidate the mechanisms governing precise mRNA activation timing for key meiotic regulators.

Main Methods:

  • Genome-wide functional screening of oocytes to identify cytoplasmically polyadenylated mRNAs.
  • Analysis of mRNA sequences for regulatory elements like cytoplasmic polyadenylation elements (CPEs) and (A+U)-rich elements (AREs).
  • Functional studies involving the C3H-4 protein, including its accumulation during meiosis and the effects of its ablation.

Main Results:

  • A significant number of mRNAs with both CPEs and AREs were identified, suggesting dual regulation.
  • The mRNA for C3H-4, an ARE-binding protein, accumulates during meiosis I, and its absence causes meiotic arrest.
  • C3H-4 recruits the CCR4 deadenylase complex, leading to poly(A) tail shortening, and this mechanism, along with CPEs, fine-tunes the translation of anaphase-promoting complex inhibitors (Emi1 and Emi2).

Conclusions:

  • An early wave of cytoplasmic polyadenylation activates a negative feedback loop involving C3H-4 synthesis.
  • C3H-4 recruits deadenylase complexes to specific mRNAs, regulating poly(A) tail length and translation timing.
  • This feedback loop is critical for exiting metaphase, interkinesis, and overall meiotic progression in oocytes.

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