发育性造血干细胞变异解释了生命后期的克隆性造血
Jesse Kreger1, Jazlyn A Mooney1, Darryl Shibata2
1Department of Quantitative and Computational Biology, University of Southern California, Los Angeles, CA, USA.
Nature communications
|November 26, 2024
概括
克隆性造血,在衰老中很常见,可能源于生命早期的变异. 在双胞胎中使用CpG甲基化追踪干细胞动态,揭示了这些与年龄相关的血液变化的产前起源.
科学领域:
- 血液学 血液学 血液学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 发展生物学 发展生物学
背景情况:
- 克隆性造血,即具有特定突变的血液细胞的扩张,随着年龄的增长而增加,但其起源尚不清楚.
- 现有的理论表明,在生命早期获得的变异上作用的选择很弱,但最初的增长冲击仍然无法解释.
研究的目的:
- 通过使用波动的CpG甲基化作为血统标记物来调查克隆性血液形成的早期起源.
- 为了确定产前干细胞变异是否会导致与年龄相关的克隆造血.
主要方法:
- 利用波动的CpG甲基化模式作为跟踪干细胞在血液形成中的克隆动态的标记.
- 检查了共享产前循环的单胞胎双胞胎,以评估生命早期干细胞变异的影响.
- 将弱选择和种群动态的理论原理应用于人类血液形成.
主要成果:
- 证明弱选择作用于出生前存在的干细胞变异可以导致生命后期的克隆性血液形成.
- 观察到血中波动的CpG甲基化在非相关个体之间的低相关性,与老年单胞胎双胞胎的高相关性形成鲜明对比.
- 表明,在发育过程中干细胞谱系的扩张可以防止弱选择变异的随机损失.
结论:
- 晚年观察到的克隆性血液形成很可能是由对出生前建立的变异起作用的弱选择驱动的.
- 产前干细胞变异和弱选择是与年龄相关的克隆性血液形成的关键因素.
- CpG甲基化模式是血液形成中早期生命克隆起源的可靠指标.
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