An experimental test of the mutation-selection balance model for the maintenance of genetic variance in fitness components

An experimental test of the mutation-selection balance model for the maintenance of genetic variance in fitness components
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维持适应度成分遗传方差的突变选择平衡模型的实验测试

DOI:
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发表时间:
2017
期刊:
bioRxiv
影响因子:
--
通讯作者:
A. Agrawal
A. Agrawal
中科院分区:
--
文献类型:
--
作者:
Nathaniel P. Sharp;A. Agrawal

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尽管进行了数十年的研究,但维持健康遗传变异的因素仍知之甚少。突变选择平衡总是会影响常备方差,但尚不清楚典型适应度成分中方差的哪一部分可以通过突变选择平衡来解释,以及适应度成分在这方面是否有所不同。理论上,可以利用突变累积下的适应度下降率来预测由于突变选择平衡而导致的适应度的站立方差水平,并且该预测可以直接与观察到的实际站立方差进行比较。这种方法允许对突变选择平衡模型的充分性进行受控统计测试,并且可用于识别由突变选择平衡之外的因素维持遗传方差的性状或群体。例如,某些性状可能会受到性对抗平衡选择的影响,导致超出有害突变产生的长期方差。为了鼓励这种方法的应用,我们描述了基本理论,并用它来测试果蝇三个性状的突变选择平衡模型。我们发现了一些证据,证明雄性交配成功率和雌性繁殖力相对于幼虫活力的非突变差异,这与性适应性成分的平衡选择一致。最后,我们讨论了这种方法的理论和实践局限性,并讨论如何成功应用它。
Despite decades of research, the factors that maintain genetic variation for fitness are poorly understood. Mutation selection balance will always contribute to standing variance, but it is unclear what fraction of the variance in a typical fitness component can be explained by mutation-selection balance and whether fitness components differ in this respect. In theory, the level of standing variance in fitness due to mutation-selection balance can be predicted using the rate of fitness decline under mutation accumulation, and this prediction can be directly compared to the actual standing variance observed. This approach allows for controlled statistical tests of the sufficiency of the mutation-selection balance model, and could be used to identify traits or populations where genetic variance is maintained by factors beyond mutation-selection balance. For example, some traits may be influenced by sexually antagonistic balancing selection, resulting in an excess of standing variance beyond that generated by deleterious mutations. To encourage the application of this approach, we describe the underlying theory and use it to test the mutation selection balance model for three traits in Drosophila melanogaster. We find some evidence for non-mutational variance in male mating success and female fecundity relative to larval viability, which is consistent with balancing selection on sexual fitness components. Finally, we discuss the theoretical and practical limitations to this approach, and discuss how to apply it successfully.
DOI: --
发表时间: 1996-07
期刊: Genetics
影响因子: 3.3
作者:
David Houle;B. Morikawa;Michael Lynch
通讯作者: David Houle;B. Morikawa;Michael Lynch
DOI: --
发表时间: 1992
期刊: Genetics
影响因子: 3.3
作者:
D. Houle
通讯作者: D. Houle
DOI: 10.1093/genetics/138.3.773
发表时间: 1994
期刊: Genetics
影响因子: 3.3
作者:
Houle,D;Hughes,KA;Hoffmaster,DK;Ihara,J;Assimacopoulos,S;Canada,D;Charlesworth,B
通讯作者: Charlesworth,B
进化遗传学的要素
DOI: --
发表时间: 2010
期刊: --
影响因子: --
作者:
Charlesworth B
通讯作者: Charlesworth B