Journal of International Reproductive Health/Family Planning ›› 2021, Vol. 40 ›› Issue (5): 391-396.doi: 10.12280/gjszjk.20210121

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DNA Damage and Repair during Ovarian Reserve Formation

ZHOU Zhi-xian, ZHU Fang, YIN Huan, SU Ye, CAI Hai-yi, FU Chun()   

  1. Department of Obstetrics and Gynecology, Second Xiangya Hospital, Central South University, Changsha 410011, China(ZHOU Zhi-xian, ZHU Fang, YIN Huan, SU Ye, FU Chun); Department of Clinical Medicine, Harbin Medical University, Harbin 150081, China(CAI Hai-yi)
  • Received:2021-03-17 Published:2021-09-15 Online:2021-09-29
  • Contact: FU Chun E-mail:fuchun0814@csu.edu.cn

Abstract:

In the process of the formation of ovarian reserve, the mammalian germ cells are in the active stage of DNA replication, exchange and recombination. DNA of this stage is sensitive to various internal and external damage factors, so it is predisposed to DNA damage. There are multiple pathways of DNA repair during this period. Homologous recombination (HR) pathway repairs DNA double-strand breaks, protects and restarts the stalled replication forks. Fanconi anemia (FA) pathway repairs interstrand crosslinks and promotes the replication forks to restart. Base excision repair (BER) pathway is an important mechanism of genome-wide epigenetic programming. Mismatch repair (MMR) pathway maintains the meiosis process and promotes the crossover formation and stabilization of the recombination process. Nucleotide excision repair (NER) pathway facilitates the repair of interstrand crosslinks. These pathways are essential for maintaining genomic stability of germ cell, reducing germ cell apoptosis, promoting germ cell proliferation and pluripotency expression to regulate the development of primordial germ cells so as to form ovarian reserve. To understand well the DNA damage and repair during ovarian reserve formation provides a theoretical basis for the etiological analysis of primary ovarian insufficiency (POI).

Key words: Ovarian reserve, DNA damage, DNA repair, Ovarian follicle, Germ cells