异质的Sox2转录动态介导mESC中的多能性维护,以应对LIF信号干扰
bioRxiv : the preprint server for biology
|April 1, 2025
概括
破坏LIF信号减少了小鼠胚胎干细胞 (mESCs) 中的Sox2基因活动,通过改变转录爆发. 这种减少,而不是完全的损失,触发了多能性损失,并揭示了Sox2.
科学领域:
- 干细胞生物学 干细胞生物学
- 基因规则 基因规则
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 白血病抑制因子 (LIF) 信号传递对于维持小鼠胚胎干细胞 (mESCs) 的自我更新和多能性至关重要.
- Sox2是调节多能性的关键转录因子,但其在单细胞水平LIF扰动下的动态行为尚未完全理解.
研究的目的:
- 在单细胞分辨率下调查LIF信号对Sox2转录动态的直接影响.
- 了解LIF信号中的扰动如何影响Sox2表达水平和多能性维护.
主要方法:
- 利用PP7/PCP介导的实时成像来实时分析Sox2转录.
- 通过去除LIF连接体或抑制JAK信号来扰乱LIF信号.
- 分析了转录性爆发动力学 (大小,频率,持续时间) 和 Sox2 在细胞周期中的遗传.
主要成果:
- 通过改变的转录突破,LIF路径扰乱异质地减少了Sox2-活性细胞,并减少了每个细胞的mRNA产生.
- 减少的Sox2表达 (降至~50%) 足以触发多能性损失,显示多能性相关特征的二进制切换.
- 索克斯2转录活性在细胞周期中表现出遗传性,独立于LIF信号状态,表明强大的转录记忆.
结论:
- LIF信号调节Sox2的转录动态,通过基因表达的定量变化而不是完全沉默来影响多能性.
- 单细胞分析揭示了Sox2表达的关键值,以维持多能性.
- Sox2表现出强大的转录记忆,确保其在细胞分裂中重新激活,这对于保持干细胞身份至关重要.
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