铁稳态和细胞克隆性驱动癌症相关的肠道DNA甲基化漂移在衰老中
Anna Krepelova1,2,3, Mahdi Rasa1,4, Francesco Annunziata1,5
1Leibniz Institute on Aging - Fritz Lipmann Institute (FLI), Jena, Germany.
Nature aging
|November 26, 2025
概括
表观遗传漂移,衰老的标志,与癌症有关. 这项研究揭示了其起源于肠道干细胞,由炎症和Wnt信号驱动,为衰老和癌症表观遗传学提供了洞察力.
科学领域:
- 遗传学 遗传学 是一个
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 衰老研究研究 衰老研究
背景情况:
- 表观遗传漂移是衰老的一个重要方面.
- 它与与年龄相关的疾病有关,包括癌症.
- 驱动表观遗传漂移的分子机制尚未完全理解.
研究的目的:
- 识别和描述与衰老和结肠癌相关的DNA甲基化 (DNAm) 漂移.
- 研究这种漂移的细胞起源和调节机制.
- 在衰老和癌症的背景下阐明DNAm漂移的分子驱动因素.
主要方法:
- 来自人类结肠样本 (健康和癌症) 的DNA甲基化和基因表达数据的分析.
- 在小鼠肠道上皮的比较分析.
- 对细胞内在和非线性特征的研究.
- 在漂移扩张中的密码克隆性和裂变的评估.
- 检查分子通路,包括炎症,Wnt信号传递,铁代谢和TET活性.
主要成果:
- 确定了与衰老和结肠癌相关的DNA甲基化漂移.
- 这种漂移被保存在小鼠肠道干细胞中,并表现出细胞内在的非线索性特性.
- 漂移扩张是由密码克隆性和裂变调节的.
- 与年龄相关的炎症和减少的Wnt信号驱动漂移,通过失调铁代谢和损害TET活性.
- 尽管CpG水平的异质性,但DNA甲基化变化在基因水平上显示出一致性.
结论:
- 该研究确定了与衰老和结肠癌相关的特定DNA甲基化漂移.
- 机械洞察力揭示了与年龄相关的炎症和Wnt信号作为关键驱动因素,影响铁代谢和TET活性.
- 这些发现为癌症中观察到的高甲基化提供了机制基础,并阐明了衰老的表观遗传机制.
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