The sensitivity of the DNA damage checkpoint prevents oocyte maturation in endometriosis.

The sensitivity of the DNA damage checkpoint prevents oocyte maturation in endometriosis.
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DNA损伤检查点的敏感性可防止子宫内膜异位症中的卵母细胞成熟。

DOI:
10.1038/srep36994
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发表时间:
2016-11-14
期刊:
影响因子:
4.6
通讯作者:
Lane SI
Lane SI
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hamdan M;Jones KT;Cheong Y;Lane SI

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小鼠卵母细胞通过纺锤体组装检查点(SAC)和DNA损伤反应(DDR)途径的活性阻止减数分裂I来对DNA损伤做出反应。目前尚不清楚DNA损伤是否是逮捕的主要触发因素,或者该途径是否对生理上经历的DNA损伤水平敏感。在这里,使用患有子宫内膜异位症的患者的卵泡液,这影响了10%的女性,并与生育能力降低有关,我们发现活性氧(ROS)水平升高,这会产生DNA损伤并打开DDR-SAC通路。只有子宫内膜异位症患者的卵泡液,而不是对照组,在卵母细胞中产生ROS和受损的DNA。这激活ATM激酶,导致SAC介导的中期I停滞。ROS清除剂可以恢复减数分裂I的完成,表明这是阻滞的主要触发因素,并提供了一种新的临床治疗方法。本研究建立了DDR诱导的卵母细胞SAC的临床相关性。它有助于解释卵母细胞如何对一种高度流行的人类疾病做出反应,以及与子宫内膜异位症相关的生育能力降低。
Mouse oocytes respond to DNA damage by arresting in meiosis I through activity of the Spindle Assembly Checkpoint (SAC) and DNA Damage Response (DDR) pathways. It is currently not known if DNA damage is the primary trigger for arrest, or if the pathway is sensitive to levels of DNA damage experienced physiologically. Here, using follicular fluid from patients with the disease endometriosis, which affects 10% of women and is associated with reduced fertility, we find raised levels of Reactive Oxygen Species (ROS), which generate DNA damage and turn on the DDR-SAC pathway. Only follicular fluid from patients with endometriosis, and not controls, produced ROS and damaged DNA in the oocyte. This activated ATM kinase, leading to SAC mediated metaphase I arrest. Completion of meiosis I could be restored by ROS scavengers, showing this is the primary trigger for arrest and offering a novel clinical therapeutic treatment. This study establishes a clinical relevance to the DDR induced SAC in oocytes. It helps explain how oocytes respond to a highly prevalent human disease and the reduced fertility associated with endometriosis.
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