Positive feedback between PU.1 and the cell cycle controls myeloid differentiation.

Positive feedback between PU.1 and the cell cycle controls myeloid differentiation.
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DOI:
10.1126/science.1240831
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发表时间:
2013-08-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Rothenberg EV
Rothenberg EV
中科院分区:
其他
文献类型:
--
作者:
Kueh HY;Champhekar A;Nutt SL;Elowitz MB;Rothenberg EV

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具有正反馈环的调控基因回路控制干细胞分化,但有几种机制可以促进正反馈。在这里,我们剖析反馈机制,通过该转录因子PU.1控制淋巴和骨髓分化。定量活细胞成像显示,发育中的B细胞通过减少PU.1转录来降低PU.1水平,而发育中的巨噬细胞通过延长其细胞周期来增加PU.1水平,这导致稳定的PU.1积累。在祖细胞中的外源性PU.1表达通过诱导细胞周期延长来增加内源性PU.1水平,这意味着调节因子和细胞周期之间的正反馈。数学建模表明,这种细胞周期耦合反馈结构有效地稳定了缓慢分裂的分化状态。这些结果表明,细胞周期持续时间的功能作为一个积极的自动调节电路的一个组成部分,以控制细胞的命运。
Regulatory gene circuits with positive feedback loops control stem cell differentiation, but several mechanisms can contribute to positive feedback. Here, we dissect feedback mechanisms through which the transcription factor PU.1 controls lymphoid and myeloid differentiation. Quantitative live-cell imaging revealed that developing B-cells decrease PU.1 levels by reducing PU.1 transcription, whereas developing macrophages increase PU.1 levels by lengthening their cell cycles, which causes stable PU.1 accumulation. Exogenous PU.1 expression in progenitors increases endogenous PU.1 levels by inducing cell-cycle lengthening, implying positive feedback between a regulatory factor and the cell cycle. Mathematical modeling showed that this cell-cycle coupled feedback architecture effectively stabilizes a slow-dividing differentiated state. These results show that cell cycle duration functions as an integral part of a positive auto-regulatory circuit to control cell fate.
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