arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1901.01495cond-mat.stat-mech
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考虑高阶近邻效应的DNA复制的模板特异性保真度:首次通过方法

The template-specific fidelity of DNA replication with high-order neighbor effects: a first-passage approach

Qiu-Shi Li, Pei-Dong Zheng, Yao-Gen Shu, Zhong-Can Ou-Yang, Ming Li

摘要:

DNA复制保真度是分子生物学中的一个关键问题。在过去的几十年里,生物化学实验提供了关键的洞察力的机制,保真度控制DNAP,而系统的理论研究,这个问题只是最近才开始。由于数学处理的潜在困难,对模板特异性复制动力学的全面调查仍然很少。在这里,我们提出了一个第一次通过的方法来解决这个问题,特别是位置的保真度,与高阶邻居效应的复杂过程。在生物学相关的条件下,我们推导出位置保真度的近似解析表达式,直观地显示了一些关键的动力学途径是如何协调的,以保证高保真度,以及高速度的复制过程。研究还表明,在任何模板位置的保真度主要由最近邻模板序列决定,这与复制突变随机分布在基因组中的想法一致。

英文摘要:

DNA replication fidelity is a critical issue in molecular biology. Biochemical experiments have provided key insights on the mechanism of fidelity control by DNAP in the past decades, whereas systematic theoretical studies on this issue began only recently. Because of the underlying difficulties of mathematical treatment, comprehensive surveys on the template-specific replication kinetics are still rare. Here we proposed a first-passage approach to address this problem, in particular the positional fidelity, for complicated processes with high-order neighbor effects. Under biologically-relevant conditions, we derived approximate analytical expressions of the positional fidelity which shows intuitively how some key kinetic pathways are coordinated to guarantee the high fidelity, as well as the high velocity, of the replication processes. It was also shown that the fidelity at any template position is dominantly determined by the nearest-neighbor template sequences, which is consistent with the idea that replication mutations are randomly distributed in the genome.

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