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The DNA damage response in mammalian oocytes
John Carroll1, Petros Marangos
1School of Biomedical Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University Melbourne, VIC, Australia.
Abstract:
DNA damage is one of the most common insults that challenge all cells. To cope, an elaborate molecular and cellular response has evolved to sense, respond to and correct the damage. This allows the maintenance of DNA fidelity essential for normal cell viability and the prevention of genomic instability that can lead to tumor formation. In the context of oocytes, the impact of DNA damage is not one of tumor formation but of the maintenance of fertility. Mammalian oocytes are particularly vulnerable to DNA damage because physiologically they may lie dormant in the ovary for many years (>40 in humans) until they receive the stimulus to grow and acquire the competence to become fertilized. The implication of this is that in some organisms, such as humans, oocytes face the danger of cumulative genetic damage for decades. Thus, the ability to detect and repair DNA damage is essential to maintain the supply of oocytes necessary for reproduction. Therefore, failure to confront DNA damage in oocytes could cause serious anomalies in the embryo that may be propagated in the form of mutations to the next generation allowing the appearance of hereditary disease. Despite the potential impact of DNA damage on reproductive capacity and genetic fidelity of embryos, the mechanisms available to the oocyte for monitoring and repairing such insults have remained largely unexplored until recently. Here, we review the different aspects of the response to DNA damage in mammalian oocytes. Specifically, we address the oocyte DNA damage response from embryonic life to adulthood and throughout oocyte development.
Insights
Oocytes face unique DNA damage risks due to long dormancy, threatening fertility and future generations. Understanding oocyte DNA repair is crucial for reproductive health and preventing hereditary diseases.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Genetics
Background:
- DNA damage is a constant cellular challenge, necessitating robust repair mechanisms for genomic stability.
- Mammalian oocytes are uniquely susceptible to DNA damage due to prolonged dormancy, risking cumulative genetic insults over decades.
- Failure in oocyte DNA repair can lead to embryonic anomalies and hereditary diseases.
Purpose of the Study:
- To review the largely unexplored mechanisms of DNA damage monitoring and repair in mammalian oocytes.
- To elucidate the oocyte's response to DNA damage from embryonic development through adulthood.
- To highlight the critical role of DNA repair in maintaining oocyte quality and reproductive potential.
Main Methods:
- Literature review focusing on DNA damage response pathways in oocytes.
- Analysis of studies examining oocyte vulnerability and repair mechanisms across developmental stages.
- Synthesis of current knowledge on the implications of DNA damage for oocyte function and fertility.
Main Results:
- Oocytes possess specialized pathways to detect and repair DNA damage, essential for maintaining fertility.
- The oocyte's DNA damage response (DDR) is active throughout its lifespan, from embryonic development to reproductive maturity.
- Cumulative DNA damage in oocytes poses a significant risk to embryonic development and the potential for hereditary mutations.
Conclusions:
- The DNA damage response in oocytes is vital for preserving genomic integrity and ensuring successful reproduction.
- Further research into oocyte-specific DNA repair mechanisms is essential for understanding and mitigating fertility decline and genetic disorders.
- Protecting oocytes from DNA damage is critical for maintaining the health of future generations.
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