端粒通过非端粒TRF2控制人类端粒酶 (TERT) 表达
Antara Sengupta1,2,3, Soujanya Vinayagamurthy1,2,3, Dristhi Soni1,2,3
1Integrative and Functional Biology Unit, CSIR-Institute of Genomics and Integrative Biology, Delhi, India.
eLife
|September 30, 2025
概括
端粒长度 (TL) 影响人类端粒酶逆转录酶 (TERT) 基因表达. 较短的端粒通过TRF2结合和PRC2招募增加TERT转录,而较长的端粒减少它,影响衰老和癌症.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 人类端粒酶逆转录酶 (TERT) 在维持端粒的功能已得到充分证实.
- 端粒长度 (TL) 对TERT调节的相互影响仍然不太清楚.
- 研究将TL与TERT基因表达联系在一起的机制对于理解细胞衰老和癌症等疾病至关重要.
研究的目的:
- 阐明端粒长度调节TERT转录的机制.
- 为了确定参与TERT的端粒长度依赖控制的分子参与者.
- 探索这种调节途径对细胞重编程和疾病的影响.
主要方法:
- 利用工程细胞系 (纤维肉瘤,结肠癌,乳腺癌) 与受控的端粒延长或缩短.
- 使用ChIP试验研究了TRF2蛋白与TERT促进体的结合.
- 评估了PRC2复合物的招募和H3K27-三甲基化水平.
- 采用外源性TERT报告员试验来测量促销者活动.
- 在纤维细胞重编程到诱导多能干细胞 (iPSCs) 期间分析了TERT调节.
主要成果:
- 证明了端粒长度和TERT转录水平之间的直接相关性.
- 确定了与TERT促进体结合的TRF2作为关键介质,独立于端粒循环.
- 表明TRF2将PRC2复合物招募到TERT促进体,以TL-依赖的方式诱导H3K27-三甲基化.
- 在各种细胞类型和iPSC重编程过程中观察到与端粒延长相关的TERT上调和与缩短相关的下调.
- 在iPSC生成过程中,TRF2与TERT促进体分离与端粒延长和TERT上调相关.
结论:
- 端粒长度通过TL-依赖的TRF2结合和PRC2招募作为TERT转录的关键调节者.
- 这种新的调节机制为控制端粒恒温提供了洞察力.
- 这些发现对了解衰老,癌症发展和干细胞多能性有重大意义.
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