水平基因转移对种群进化平衡的影响
Impact of the horizontal gene transfer on the evolutionary equilibria of a population
摘要：
选择、突变和水平基因转移之间的相互作用如何改变细菌或细胞群体的表型分布？横向基因转移相当于个体之间的遗传物质交换，在许多生物体的适应中发挥着重要作用，但其对种群表型密度的影响尚未得到充分了解。研究了一类描述无性种群表型密度演化平衡的椭圆型积分微分方程。在一个政权的小突变的方差，我们的特点的解决方案，从竞争资源，突变和水平基因转移之间的平衡。我们发现，在一定的参数范围内，多态平衡存在，这意味着表型密度可能集中在几个显性性状。这种多态性平衡的结果从水平基因转移和选择之间的拮抗剂相互作用，而类似的模型，忽略了转移只导致单态平衡。
英文摘要：
How does the interplay between selection, mutation and horizontal gene transfer modify the phenotypic distribution of a bacterial or cell population? While horizontal gene transfer, which corresponds to the exchange of genetic material between individuals, has a major role in the adaptation of many organisms, its impact on the phenotypic density of populations is not yet fully understood. We study an elliptic integro-differential equation describing the evolutionary equilibrium of the phenotypic density of an asexual population. In a regime of small mutational variance, we characterize the solution which results from the balance between competition for a resource, mutation and horizontal gene transfer. We show that in a certain range of parameters polymorphic equilibria exist, which means that the phenotypic density may concentrate around several dominant traits. Such polymorphic equilibria result from an antagonist interplay between horizontal gene transfer and selection, while similar models which neglect the transfer lead only to monomorphic equilibria.
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