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arXiv 0901.0663q-bio.PEcond-mat.stat-mech
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突变选择模型的鲁棒性和上位性

Robustness and epistasis in mutation-selection models

Andrea Wolff, Joachim Krug

摘要:

我们调查的健身优势与表型对有害突变的鲁棒性使用确定性突变选择模型的准种类型配备了一个台面形的适应度景观。我们得到的鲁棒性效果,成为精确的无限序列长度的限制,解析结果。因此,我们能够澄清最近严格的工作和早期的启发式处理的基础上映射到薛定谔方程之间的矛盾。我们利用量子力学类比计算有限序列长度的校正项,并通过数值研究验证我们的分析结果。此外,我们调查的错误阈值的一般类上位景观的发生,并表明,减少上位性是一个必要的,但不是充分条件的错误阈值的行为。

英文摘要:

We investigate the fitness advantage associated with the robustness of a phenotype against deleterious mutations using deterministic mutation-selection models of quasispecies type equipped with a mesa shaped fitness landscape. We obtain analytic results for the robustness effect which become exact in the limit of infinite sequence length. Thereby, we are able to clarify a seeming contradiction between recent rigorous work and an earlier heuristic treatment based on a mapping to a Schrödinger equation. We exploit the quantum mechanical analogy to calculate a correction term for finite sequence lengths and verify our analytic results by numerical studies. In addition, we investigate the occurrence of an error threshold for a general class of epistatic landscape and show that diminishing epistasis is a necessary but not sufficient condition for error threshold behavior.

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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