开发一种表观遗传时钟,抵抗免疫细胞组成的变化
Alan Tomusiak1,2, Ariel Floro1,2, Ritesh Tiwari1
1Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, 94945, CA, USA.
Communications biology
|August 2, 2024
概括
由于免疫细胞组成的变化,表观遗传钟可能不准确地预测年龄. 一个新的时钟,IntrinClock,从细胞类型中分离了内在衰老,揭示了真正的与年龄相关的变化和逆转年龄的潜力.
科学领域:
- 表观遗传学和衰老研究.
- 免疫学 免疫学 免疫学
- 计算生物学是一种计算生物学.
背景情况:
- 表观遗传钟使用DNA甲基化预测生物或时间年龄.
- 在大量组织上训练的现有时钟将衰老与细胞组成的变化混为一谈.
- 免疫细胞群,如CD8+T细胞,随着年龄的增长而变化,影响大量组织甲基化.
研究的目的:
- 研究免疫细胞组成的变化如何影响表观遗传年龄预测.
- 开发一种新的表观遗传时钟,可以测量细胞内在的衰老.
- 为了验证新时钟追踪衰老和衰老逆转的能力.
主要方法:
- 分析了来自不同年龄段的个体的天真和效应记忆CD8+T细胞中的DNA甲基化.
- 开发了IntrinClock,一种在细胞类型匹配的样本上训练的表观遗传时钟.
- 在体外使用复制性衰老模型和体内使用OSKM重编程测试了IntrinClock.
主要成果:
- 纯粹的CD8+ T细胞显示表观遗传年龄明显比效能记忆细胞年轻.
- 同质的天真T细胞表现出依赖年龄的表观遗传年龄增加,独立于细胞组成.
- 在重新编程过程中,IntrinClock准确地反映了衰老的年龄进展和年龄逆转.
结论:
- 当前的表观遗传钟被免疫细胞群体与年龄相关的变化所混.
- IntrinClock成功地隔离了细胞内在的衰老,提供了更准确的生物年龄测量.
- 这种方法可以精确追踪衰老和干预措施,如重编程以逆转年龄.
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