成熟卵细胞中DNA损伤的增加与自细胞激活的减少有关
Fei Sun1, Nourhan Nashat Ali1,2, Daniela Londoño-Vásquez1
1Division of Animal Sciences, University of Missouri, Columbia, MO, USA.
Nature communications
|November 2, 2024
概括
在卵细胞中,由于关闭的染色质状态和缺乏自,DNA损伤的修复是无效的. 老化卵细胞的自减少会使DNA损伤恶化,影响生育能力和辅助生殖.
科学领域:
- 生殖生物学 生殖生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 修复DNA损伤 (DDR) 对于保持基因组完整性至关重要.
- 哺乳动物卵细胞在中度至严重的DNA损伤下表现出低效的DDR,其潜在机制尚不清楚.
- 卵细胞衰老与DNA损伤增加和生殖潜力降低有关.
研究的目的:
- 研究成熟卵细胞中低效的DNA损伤修复背后的机制.
- 探索自在卵细胞DNA损伤反应中的作用及其对衰老的影响.
- 确定在辅助生殖疗法中改善卵细胞质量的潜在治疗点.
主要方法:
- 在小鼠和猪卵细胞中诱导DNA双链断裂.
- 分析染色质状态和DNA损伤修复蛋白质可访问性的分析.
- 在对DNA损伤的反应中对自细胞激活的评估.
- 在年轻人与母亲年龄化的卵细胞中,DDR和自的比较.
主要成果:
- 卵细胞中适度的DNA损伤会导致形积分和改变的,闭合的染色质状态,阻碍DNA修复蛋白的访问.
- 卵细胞与体细胞不同,在对DNA双链断裂的反应中未能激活自,导致低效的DDR.
- 自活动在母体年龄化的卵细胞中进一步减少,其诱导与减少的DNA损伤相关.
结论:
- 减少自细胞激活是导致卵细胞DNA损伤修复减弱的关键因素.
- 这种损伤在老年女性的卵细胞中加剧,影响生育能力.
- 增强自可能为改善卵细胞质量和辅助生殖结果提供一种新的策略.
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