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Author Spotlight: Understanding DNA Damage Response in Mammalian Oocytes and Preimplantation Embryos
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Author Spotlight: Understanding DNA Damage Response in Mammalian Oocytes and Preimplantation Embryos

Published on: June 23, 2023

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DNA damage responses in mammalian oocytes

Josie K Collins1, Keith T Jones1

  • 1Centre for Biological SciencesFaculty of Natural and Environmental Sciences, University of Southampton, Southampton, UK k.t.jones@soton.ac.uk; jkc1g10@soton.ac.uk.

Reproduction (Cambridge, England)
|April 13, 2016
PubMed

Insights

DNA damage during egg cell development can cause infertility. Oocytes utilize the Spindle Assembly Checkpoint to prevent damaged eggs, revealing a new role for this crucial cellular pathway.

Area of Science:

  • Reproductive biology
  • Cellular biology
  • Genetics

Background:

  • DNA damage during meiosis can lead to infertility and miscarriage.
  • Oocytes must detect and respond to DNA damage to ensure healthy egg formation.
  • Previous understanding suggested the Spindle Assembly Checkpoint is weak in oocytes.

Purpose of the Study:

  • To review strategies oocytes use to respond to DNA damaging events.
  • To highlight a novel pathway in oocytes preventing mature eggs with DNA damage.
  • To explore the role of the Spindle Assembly Checkpoint in oocyte DNA damage response.

Main Methods:

  • Review of recent evidence on oocyte DNA damage response pathways.
  • Analysis of oocyte behavior following induced DNA damage.
  • Investigation of Spindle Assembly Checkpoint activation in maturing oocytes.

Main Results:

  • Fully grown oocytes with DNA damage do not arrest but resume meiosis and stall in the first meiotic division.
  • The Spindle Assembly Checkpoint is actively involved in arresting maturing oocytes at metaphase I.
  • This indicates a previously unrecognized function of the Spindle Assembly Checkpoint in oocyte DNA damage response.

Conclusions:

  • Oocytes employ a novel mechanism involving the Spindle Assembly Checkpoint to prevent the formation of eggs with DNA damage.
  • The Spindle Assembly Checkpoint has a second, critical function in oocyte DNA damage response during meiosis I.
  • This finding has implications for understanding infertility and developing reproductive health strategies.

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