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arXiv 1106.0079q-bio.PE
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在时间相关环境中的适应度包括几何贡献

Fitness in time-dependent environments includes a geometric contribution

Sorin Tanase-Nicola, Ilya Nemenman

摘要:

表型进化意味着新基因组序列的连续固定。这些突变固定的速度部分取决于突变体与祖先的相对适合度(选择系数)。使用简单的种群动力学模型,我们证明了动态环境中的相对适应度不等于单个环境的平均适应度。相反,它包括一个明确依赖于环境序列的术语。这个术语本质上是几何的,并且仅取决于由系统在环境状态空间中所采取的轨迹所包围的定向区域。它与经典和量子物理系统中研究得很好的几何相位有关。我们讨论了这些观察结果可能的生物学意义,重点是新的代谢或抗应激功能的进化。

英文摘要:

Phenotypic evolution implies sequential fixations of new genomic sequences. The speed at which these mutations fixate depends, in part, on the relative fitness (selection coefficient) of the mutant vs. the ancestor. Using a simple population dynamics model we show that the relative fitness in dynamical environments is not equal to the fitness averaged over individual environments. Instead it includes a term that explicitly depends on the sequence of the environments. This term is geometric in nature and depends only on the oriented area enclosed by the trajectory taken by the system in the environment state space. It is related to the well-studied geometric phases in classical and quantum physical systems. We discuss possible biological implications of these observations, focusing on evolution of novel metabolic or stress-resistant functions.

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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