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arXiv 1602.02841q-bio.PEcs.DSmath.CO
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系统发生网络的组合评分

Combinatorial Scoring of Phylogenetic Networks

Nikita Alexeev, Max A. Alekseyev

摘要:

根据物种的特征构建其系统发育树和网络是植物基因组学研究的关键问题之一。虽然这个问题的解决方案并不总是唯一定义的,并且存在多种树/网络构建方法,但重要的是要衡量构建的网络如何捕获跨物种的给定字符关系。在目前的研究中,我们提出了一种新的方法来衡量一个给定的系统发育网络的特异性方面的字符状态分布在叶子的网络可能会施加的总数。而对于二叉系统发育树,这个数有一个精确的公式,只取决于叶子和字符状态的数量,而不是对树的拓扑结构,情况要复杂得多的非二叉树或网络。尽管如此,我们开发了一个算法的组合枚举这样的分布,这是适用于任意树和网络在一些合理的假设。

英文摘要:

Construction of phylogenetic trees and networks for extant species from their characters represents one of the key problems in phylogenomics. While solution to this problem is not always uniquely defined and there exist multiple methods for tree/network construction, it becomes important to measure how well the constructed networks capture the given character relationship across the species. In the current study, we propose a novel method for measuring the specificity of a given phylogenetic network in terms of the total number of distributions of character states at the leaves that the network may impose. While for binary phylogenetic trees, this number has an exact formula and depends only on the number of leaves and character states but not on the tree topology, the situation is much more complicated for non-binary trees or networks. Nevertheless, we develop an algorithm for combinatorial enumeration of such distributions, which is applicable for arbitrary trees and networks under some reasonable assumptions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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