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arXiv 1202.6274q-bio.MN
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通过调节蛋白与基因的缓慢结合/解结合的发育和分化的新机制

A new mechanism of development and differentiation through slow binding/unbinding of regulatory proteins to the genes

Haidong Feng, Jin Wang

摘要:

了解分化,从多能干细胞或祖细胞状态到成熟细胞的生物学过程是至关重要的。我们开发了一个理论框架来量化细胞发育和分化的潜在景观和生物学途径。我们提出了一个新的机制,通过结合/解结合的调节蛋白的基因启动子的分化和发展。我们发现分化状态确实可以从缓慢的启动子结合/解结合过程中出现。此外,在慢启动子结合/解结合下,我们发现了多个亚稳态分化状态。这可以解释在最近的实验中观察到的多个状态的起源。此外,通过分化和重编程的平均第一次传代过渡时间量化的动力学时间强烈依赖于启动子结合/解结合过程的时间尺度。我们发现了一个最佳的速度分化为一定的结合/未结合率的调节蛋白启动子。未来更多的实验可能能够判断细胞是否以最佳速度分化。此外,我们量化了分化和重编程的动力学途径。我们发现它们是不可逆转的。这捕获了多能干细胞或祖细胞中的非平衡动力学。这种固有的时间不对称性,由于不可逆的状态转换途径,如图所示,可能提供的起源时间箭头细胞发展。

英文摘要:

Understanding the differentiation, a biological process from a multipotent stem or progenitor state to a mature cell is critically important. We develop a theoretical framework to quantify the underlying potential landscape and biological paths for cell development and differentiation. We propose a new mechanism of differentiation and development through binding/unbinding of regulatory proteins to the gene promoters. We found indeed the differentiated states can emerge from the slow promoter binding/unbinding processes. Furthermore, under slow promoter binding/unbinding, we found multiple meta-stable differentiated states. This can explain the origin of multiple states observed in the recent experiments. In addition, the kinetic time quantified by mean first passage transition time for the differentiation and reprogramming strongly depends on the time scale of the promoter binding/unbinding processes. We discovered an optimal speed for differentiation for certain binding/unbinding rates of regulatory proteins to promoters. More experiments in the future might be able to tell if cells differentiate at at that optimal speed. In addition, we quantify kinetic pathways for the differentiation and reprogramming. We found that they are irreversible. This captures the non-equilibrium dynamics in multipotent stem or progenitor cells. Such inherent time-asymmetry as a result of irreversibility of state transition pathways as shown may provide the origin of time arrow for cell development.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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