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arXiv 1002.3837q-bio.PE
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有限种群的拟种理论

Quasispecies theory for finite populations

Jeong-Man Park, Enrique Munoz, Michael W. Deem

摘要:

我们提出了随机的,有限的人口配方的Crow-Kimura和特征模型的准种理论,健身功能,依赖于在一个任意的方式从野生型的突变数量。我们在描述中包括回复突变。结果表明,在这些物理演化模型中,种群数关于平均值的涨落是非常大的。我们进一步表明,水平基因转移减少了数量级的波动,在人口数量和减少有害突变的积累在有限的人口由于穆勒的棘轮。事实上,收敛到无限种群极限所需的种群规模往往大于在没有水平基因转移的情况下自然界中发现的平滑适应度函数。这些分析结果来自稳态的场论表示。数值结果表明,水平基因转移的进化动力学以及加快。

英文摘要:

We present stochastic, finite-population formulations of the Crow-Kimura and Eigen models of quasispecies theory, for fitness functions that depend in an arbitrary way on the number of mutations from the wild type. We include back mutations in our description. We show that the fluctuation of the population numbers about the average values are exceedingly large in these physical models of evolution. We further show that horizontal gene transfer reduces by orders of magnitude the fluctuations in the population numbers and reduces the accumulation of deleterious mutations in the finite population due to Muller's ratchet. Indeed the population sizes needed to converge to the infinite population limit are often larger than those found in nature for smooth fitness functions in the absence of horizontal gene transfer. These analytical results are derived for the steady-state by means of a field-theoretic representation. Numerical results are presented that indicate horizontal gene transfer speeds up the dynamics of evolution as well.

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