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Ppan is essential for preimplantation development in mice†.

Qing Tian1, Yu Tian1, Ximiao He2

  • 1Institute of Reproductive Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.

Biology of Reproduction
|May 13, 2022
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Summary

Peter Pan (PPAN) is crucial for mouse embryonic development. Its absence halts embryo growth at the morula stage, highlighting its essential role in early embryogenesis.

Keywords:
Ppanoocyte maturationpreimplantation developmentrRNAs

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Area of Science:

  • Molecular and Cellular Biology
  • Developmental Biology
  • Genetics

Background:

  • Peter Pan (PPAN), a Brix domain protein, localizes to nucleoli and mitochondria.
  • PPAN is implicated in rRNA processing and mitochondrial apoptosis regulation.
  • Previous studies in Drosophila show PPAN's importance for proliferation and viability, but its role in mammalian reproduction is unknown.

Purpose of the Study:

  • To investigate the function of PPAN in mouse oocyte maturation and early embryogenesis.
  • To elucidate the necessity of PPAN for successful embryonic development in mammals.

Main Methods:

  • Utilized a conditional knockout mouse model to study PPAN's function.
  • Assessed the impact of maternal and zygotic PPAN depletion on oocyte maturation and preimplantation embryo development.
  • Analyzed rRNA expression levels and transcriptome changes following PPAN depletion.
  • Investigated PPAN's DNA binding activity in mouse embryonic stem cells.

Main Results:

  • Maternal PPAN deficiency downregulated key rRNA components (5.8S, 18S, 28S) but did not affect oocyte maturation or preimplantation development.
  • Depletion of both maternal and zygotic PPAN, or only zygotic PPAN, arrested embryonic development at the morula stage.
  • PPAN lacks DNA binding activity and its depletion minimally impacts the overall transcriptome, despite reducing rRNA levels.

Conclusions:

  • PPAN is essential for successful early embryogenesis in mice, with its absence leading to developmental arrest.
  • The function of PPAN in mammalian reproduction is critical for embryonic progression beyond the morula stage.
  • PPAN's role appears linked to rRNA processing rather than direct DNA binding or broad transcriptional regulation.