Establishment process of a magic trait allele subject to both divergent selection and assortative mating
Establishment process of a magic trait allele subject to both divergent selection and assortative mating
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DOI：
10.1016/j.tpb.2020.07.001
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发表时间：
2020-10-01
影响因子：
1.4
通讯作者：
Innan, H.
中科院分区：
文献类型：
--
作者：
Sakamoto, T.;Innan, H.
性选择和趋异选择是生殖隔离的主要驱动力，最终可能导致物种形成。一个神奇的特征被定义为一个单一的特点是受到两个分歧的选择和配偶选择通过表型为基础的替代交配。我们在这里感兴趣的是在一个有限的群体中，负责一个神奇性状的遗传位点上的等位基因的进化行为。我们假设在一对同质亚群中，一个突变的等位基因出现在神奇性状位点上，并从理论上得到新等位基因在群体中建立的概率，即建立概率。我们还示出了等位基因频率沿着建立的轨迹的解析表达式，从该解析表达式中获得建立所需的时间或建立时间。在这种模式下，趋异选择只是倾向于新的等位基因，以固定在它是有益的，而排斥交配的工作对罕见的等位基因。从理论上证明，新等位基因的命运是由两种选择力的相对贡献决定的，即趋异选择和选择性交配，当等位基因稀少时，两种选择力相互抵消。我们的理论结果的建立概率和时间，使我们能够了解随机遗传漂变的建立过程中的一个神奇的性状等位基因在有限的人口中的相对作用。(C)2020爱思唯尔公司All rights reserved.
Sexual selection and divergent selection are among the major driving forces of reproductive isolation, which could eventually result in speciation. A magic trait is defined such that a single trait is subject to both divergent selection and mate choice through phenotype-based assortative mating. We are here interested in the evolutionary behavior of alleles at a genetic locus responsible for a magic trait in a finite population. We assume that, in a pair of homogeneous subpopulations, a mutant allele arises at the magic trait locus, and theoretically obtain the probability that the new allele establishes in the population, or the establishment probability. We also show an analytical expression for the trajectory of allele frequency along the establishment, from which the time required for the establishment is obtained, or the establishment time. Under this model, divergent selection simply favors the new allele to fix where it is beneficial, whereas assortative mating works against rare alleles. It is theoretically demonstrated that the fate of the new allele is determined by the relative contributions of the two selective forces, divergent selection and assortative mating, when the allele is rare so that the two selective forces counteract. Our theoretical results for the establishment probability and time allow us to understand the relative role of random genetic drift in the establishment process of a magic trait allele in a finite population. (C) 2020 Elsevier Inc. All rights reserved.