在人类和小鼠造血干细胞中比较单细胞谱系偏差
Isaac Shamie1, Meghan Bliss-Moreau2, Jamie Casey Lee3
1Department of Bioengineering, UC San Diego, La Jolla, CA.
Haematologica
|July 17, 2025
概括
造血干细胞 (HSC) 血统承诺显示了最小的内在偏差. 微环境,特别是受体,主要决定了髓状和淋巴状细胞的产生,这表明一种随机的分化过程.
科学领域:
- 血液学 血液学 血液学
- 干细胞生物学 干细胞生物学
- 遗传学 遗传学 是一个
背景情况:
- 造血干细胞 (HSC) 分化成各种血细胞类型.
- 血统承诺受到内在因素和微环境线索的影响.
- 了解HSC的血统偏差对于再生医学和理解血液疾病至关重要.
研究的目的:
- 研究人类造血干细胞 (HSC) 中的内在血统承诺偏差.
- 确定细胞内在因素与微环境在HSC分化中的贡献.
- 通过使用自然存在的遗传条形码来追踪HSC分化潜力.
主要方法:
- 线粒体单细胞ATAC测序 (mtscATAC-Seq) 用于识别线粒体DNA中的体位突变.
- 这些突变作为遗传条形码来追踪人类CD34+细胞及其后代的克隆血统.
- 在体内研究涉及将有限数量的长期HSC (LT-HSC) 移植到小鼠体内,以评估移植模式.
主要成果:
- 人类CD34+细胞的ex vivo分化显示,在血液构造树上,克隆系的分布正常,这表明没有显著的倾斜.
- 在小鼠体内移植实验显示,骨髓细胞和淋巴细胞比率的变化不会因增加LT-HSC数量而改变.
- 植入比率在很大程度上独立于供体LT-HSC数量,这表明细胞内在血统偏差最小.
结论:
- 人类HSC血统的承诺似乎是一个随机的过程,而不是被强大的细胞内在偏差所支配.
- 照射受体在确定髓状细胞和淋巴状细胞的输出比率方面发挥着主导作用.
- 微环境显著影响HSC差异化,内在血统偏差的贡献较小.
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