The evolution of reversible switches in the presence of irreversible mimics.

The evolution of reversible switches in the presence of irreversible mimics.
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DOI:
10.1111/j.1558-5646.2009.00729.x
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发表时间:
2009-09
期刊:
Evolution; international journal of organic evolution
影响因子:
--
通讯作者:
Masel J
Masel J
中科院分区:
其他
文献类型:
--
作者:
Lancaster AK;Masel J

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可逆的表型转换可以由许多不同的机制引起,包括表观遗传系统和基于DNA的偶然位点。先前的研究表明,可逆开关系统可能受到自然选择的青睐。许多开关可以被表征为“开/关”,其中“关”状态构成功能的暂时且可逆的丧失。与“关闭”状态相对应的功能表型的丧失可以以许多不同的方式产生,所有这些都在短期内产生相同的适应性。然而,从长远来看,开关诱导的功能丧失是可以逆转的,而许多功能丧失突变,特别是缺失,则不能逆转。我们将这些功能丧失突变称为可逆开关的“不可逆模拟物”。在这里,我们开发了一个模型,其中可逆开关的发展中存在的不可逆的模仿和集合种群结构。我们计算出,当不可逆的模仿的出现率超过迁移率,进化的可逆转换率将超过赌对冲率预测的泛混合模型。
Reversible phenotypic switching can be caused by a number of different mechanisms including epigenetic inheritance systems and DNA-based contingency loci. Previous work has shown that reversible switching systems may be favored by natural selection. Many switches can be characterized as “on/off” where the “off” state constitutes a temporary and reversible loss of function. Loss of function phenotypes corresponding to the “off” state can be produced in many different ways, all yielding an identical fitness in the short term. In the long term, however, a switch-induced loss of function can be reversed, while many loss of function mutations, especially deletions, cannot. We refer to these loss of function mutations as “irreversible mimics” of the reversible switch. Here we develop a model where a reversible switch evolves in the presence of both irreversible mimics and metapopulation structure. We calculate that when the rate of appearance of irreversible mimics exceeds the migration rate, the evolved reversible switching rate will exceed the bet-hedging rate predicted by panmictic models.
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