Maintenance of genetic variability under strong stabilizing selection: a two-locus model.

Maintenance of genetic variability under strong stabilizing selection: a two-locus model.
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在强稳定选择下维持遗传变异:双基因座模型。

DOI:
10.1093/genetics/134.1.377
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发表时间:
1993
期刊:
影响因子:
3.3
通讯作者:
Hastings,A
Hastings,A
中科院分区:
生物学2区
文献类型:
--
作者:
Gavrilets,S;Hastings,A

文献摘要

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我们研究了一个两个基因座的模型与加性贡献的表型,以探讨稳定选择和重组之间的关系。我们表明,如果双杂合子具有最佳的表型和贡献的基因座的性状是不同的,那么任何对称稳定的选择适合度函数可以保持遗传变异提供足够强的选择相对于连锁。我们提出的二次适应度函数的详细分析结果表明,选择不需要非常强大的重组多态平衡是稳定的。在这些多态平衡点上,性状的平均值一般不等于最佳表型,存在着大量的负连锁不平衡,“隐藏”了加性遗传方差,不同的平衡点可以同时稳定。我们分析了这些平衡的最佳表型的位置上的不同特征的依赖性,在等位基因效应的差异,和相对于重组的选择强度。我们的总体结果是,稳定选择并不一定消除遗传变异性,这与一些实验结果是一致的,其中经受强稳定选择的品系的遗传变异性并没有显着降低。
We study a two locus model with additive contributions to the phenotype to explore the relationship between stabilizing selection and recombination. We show that if the double heterozygote has the optimum phenotype and the contributions of the loci to the trait are different, then any symmetric stabilizing selection fitness function can maintain genetic variability provided selection is sufficiently strong relative to linkage. We present results of a detailed analysis of the quadratic fitness function which show that selection need not be extremely strong relative to recombination for the polymorphic equilibria to be stable. At these polymorphic equilibria the mean value of the trait, in general, is not equal to the optimum phenotype, there exists a large level of negative linkage disequilibrium which "hides" additive genetic variance, and different equilibria can be stable simultaneously. We analyze dependence of different characteristics of these equilibria on the location of optimum phenotype, on the difference in allelic effect, and on the strength of selection relative to recombination. Our overall result that stabilizing selection does not necessarily eliminate genetic variability is compatible with some experimental results where the lines subject to strong stabilizing selection did not have significant reductions in genetic variability.
DOI: 10.1007/bf00163923
发表时间: 1993-04-01
影响因子: 1.9
作者:
GAVRILETS, S
通讯作者: GAVRILETS, S
DOI: 10.1017/s0016672300003219
发表时间: 1962
期刊: Genetics Research
影响因子: 1.5
作者:
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最佳模型的稳定均衡。
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发表时间: 1959
影响因子: 11.1
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稳定选择的双基因座模型中遗传变异的维持。
DOI: 10.1093/genetics/122.1.235
发表时间: 1989
期刊: Genetics
影响因子: 3.3
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T. Nagylaki
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多效性模型中的多重平衡与加性遗传变异的维持
DOI: 10.1111/j.1558-5646.1990.tb05222.x
发表时间: 1990
期刊: Evolution
影响因子: 3.3
作者:
A. Hastings;C. Hom
通讯作者: C. Hom