在基因毒性压力后,DAF-16/FOXO保持了基因组完整性
Umanshi Rautela1, Oviya Devendran1, Gautam Chandra Sarkar1
1Molecular Ageing Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110067, India.
bioRxiv : the preprint server for biology
|November 24, 2025
概括
福克斯转录因子DAF-16通过激活C. elegans的DNA损伤反应 (DDR) 基因来保护基因组的完整性. 这一途径对于预防衰老和确保跨世代遗传稳定性至关重要.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 衰老研究研究 衰老研究
背景情况:
- 基因组完整性对于遗传和预防过早衰老至关重要.
- DNA损伤反应 (DDR) 保护基因组免受损伤.
- 营养感应通路,如胰岛素/IGF信号传递 (IIS),影响衰老,但它们在DDR中的作用不太清楚.
研究的目的:
- 研究DAF-16/FOXO在调节DDR和维护基因组完整性的作用.
- 阐明DAF-16影响DNA修复途径的机制.
主要方法:
- 利用C. elegans作为一个模型生物体.
- 研究了DAF-16与DDR基因的基因表达和蛋白质结合.
- 研究了不同DAF-16异型 (DAF-16a和DAF-16d/f) 在保持基因组完整性方面的功能.
主要成果:
- 在低IIS条件下,DAF-16/FOXO直接激活DDR修复基因的表达.
- DAF-16与DDR基因促进体结合,保持更高的表达水平,以有效修复DNA.
- DAF-16既具有细胞自主性,也具有非自主性的作用,以维护DNA完整性.
- DAF-16 (d/f) 异型,而不是DAF-16 (a),对于生殖基因组完整性至关重要.
- DAF-16通过正规途径和细胞亡中介细胞清除来增强DDR.
结论:
- 通过调节DDR,DAF-16/FOXO在保护基因组完整性方面发挥着重要作用.
- DAF-16将营养感应与DNA修复机制联系在一起,影响衰老和遗传稳定性.
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