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E2F4 regulates cell cycle to mediate embryonic development in pigs.

Wen-Jie Jiang1, Ming-Hong Sun1, Xiao-Han Li1

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|November 25, 2022
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Summary

E2F4 (E2F transcription factor 4) is crucial for porcine embryo development, acting as a transcriptional activator. Its depletion impairs cell cycle progression and blastocyst formation, challenging its known repressor function.

Keywords:
Cell cycleE2F transcription Factor 4 (E2F4)Embryonic developmentPig

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • E2F transcription factor 4 (E2F4) is a key cell cycle regulator in mammals.
  • While E2F4's functions are studied in animals, its role in embryonic development remains largely unknown.
  • This study focuses on E2F4's function and mechanism in porcine embryo development.

Purpose of the Study:

  • To investigate the function of E2F4 in porcine embryo development.
  • To elucidate the mechanism of action of E2F4 during early embryonic stages.

Main Methods:

  • E2F4 was knocked down in porcine embryos using double-stranded RNA microinjection at the 1-cell stage.
  • Cell cycle progression, DNA damage, and histone acetylation were analyzed at the 4-cell and blastocyst stages.

Main Results:

  • E2F4 knockdown significantly reduced blastocyst rates and total cell numbers.
  • Reduced E2F4 expression impaired G1/S checkpoints and cell cycle gene expression.
  • E2F4 depletion increased DNA damage markers (phosphorylated H2A.X, ATM activation) and decreased histone acetylation.

Conclusions:

  • E2F4 acts as a critical transcriptional activator in porcine embryo development.
  • This finding contradicts the established role of E2F4 as a transcription repressor.
  • E2F4 is essential for maintaining cell cycle progression and genomic integrity during porcine embryogenesis.