通过YY1介导的多组功能保护了造血干细胞免受过早衰老的影响
bioRxiv : the preprint server for biology
|February 9, 2026
概括
衰老的造血干细胞 (HSC) 表现出髓状偏差和功能丧失. 阴阳1 (YY1) 聚合组 (PcG) 活动对于维持高细胞静止和自我更新至关重要,延缓衰老.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 干细胞生物学 干细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 造血干细胞 (HSC) 随着年龄的增长而功能性下降,表现为髓状偏差和静止性丧失.
- 人们还没有完全理解高细胞衰老的分子驱动因素.
- 阴阳1 (YY1) 是一种转录因子,通过多组 (PcG) 复合体参与表观遗传调节.
研究的目的:
- 为了研究YY1的多组 (PcG) 功能在成年HSC衰老中的作用.
- 定义导致HSC功能衰退的表观遗传机制.
主要方法:
- 生成了一个有条件的YY1 REPO域淘汰赛小鼠模型 (Yy1-/ΔREPO).
- 分析了HSC免疫类型,自我更新能力,分化输出和细胞衰老标志物.
- 利用RNA测序 (RNA-seq) 来评估基因网络失调.
主要成果:
- 删除YY1 REPO域导致HSC过早老化和长期自我更新的丧失.
- Yy1-/ΔREPO HSCs表现出髓质偏差分化,静止减少,氧化应激增加.
- RNA-seq揭示了老年HSCs中失调的代谢基因网络.
结论:
- YY1 PcG活动对于维持高细胞代谢静止和自我更新能力至关重要.
- YY1 PcG 功能作为一个关键的表观遗传调节器,延迟 HSC 的衰老.
- 这项研究揭示了一个基本的PCG依赖的表观遗传机制,控制了HSC在衰老过程中的命运和功能.
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