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TET activity safeguards pluripotency throughout embryonic dormancy.

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Cellular dormancy, or diapause, maintains embryo identity via TET-TFE3 axis. This mechanism protects cis-regulatory elements, ensuring pluripotency and survival during developmental arrest, crucial for propagation.

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Mammalian Embryology

Background:

  • Dormancy (diapause) is vital for mammalian embryo survival during stress.
  • Mechanisms preserving cellular identity and pluripotency in dormant embryos are unknown.
  • In vitro diapause can be induced by inhibiting mTOR.

Purpose of the Study:

  • To elucidate cellular strategies safeguarding cell identity during embryonic diapause.
  • To identify key molecular players involved in maintaining pluripotency in dormant embryos.

Main Methods:

  • Investigated the role of cis-regulatory elements in maintaining pluripotency during diapause.
  • Characterized the TET-transcription factor axis, including TET-mediated DNA demethylation and TFE3 recruitment.
  • Assessed the impact of perturbing TET activity on mouse embryo pluripotency and survival in diapause.

Main Results:

  • Protection of cis-regulatory elements from genomic silencing is critical for pluripotency in dormant embryos.
  • A TET-transcription factor axis (TET-TFE3) drives chromatin adaptations for dormancy.
  • TET activity is essential for mouse embryo pluripotency and survival during diapause; enhancing it improves survival.

Conclusions:

  • The TET-TFE3 axis is a key mechanism for maintaining cellular identity in dormant mammalian embryos.
  • This epigenetic regulation ensures the propagation of cell identity through diapause.
  • Findings have implications for understanding regeneration and diseases related to developmental arrest.