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arXiv 1506.07976q-bio.PE
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基于基因树聚类的多位点系统发育分析

Multi Loci Phylogenetic Analysis with Gene Tree Clustering

Ruriko Yoshida, Kenji Fukumizu, Chrysafis Vogiatzis

摘要:

理论和经验证据都表明,不同基因(基因座)的遗传(树)不会显示精确匹配的拓扑结构。这种系统发育的不一致性归因于大多数物种的网状进化历史,这是由于真核生物中减数分裂的有性重组,或原核生物中遗传物质的水平转移。尽管如此,大多数基因确实显示拓扑相关的同源性;这意味着它们形成内聚子集(簇)。在这项工作中,我们比较流行的聚类方法,并显示如何的性能的规范化切割框架是有效的,统计上准确的基因树的集合上获得集群的基础上,他们之间的测地距离在Billera-Holmes-Vogtmann(BHV)树空间。我们继续提出了一个计算研究的性能不同的聚类方法,在不同的距离度量和使用一系列的降维技术下的预处理。结果如下:首先,我们使用模拟数据表明,Ncut框架确实准确地集群的基因树的集合下的聚结过程中的物种树。然后,我们描述了我们的框架的成功,通过比较其性能与其他聚类技术,包括k-means和层次聚类。主要的计算结果可以概括为恒星性能的Ncut框架,即使没有降维,类似的性能描绘的k-means和Ncut下大多数降维方案,完全失败的层次聚类,以准确地捕捉集群,以及显着更好的性能的NJp方法,相比MLE。

英文摘要:

Summary: Both theory and empirical evidence indicate that phylogenies (trees) of different genes (loci) do not display precisely matched topologies. This phylogenetic incongruence is attributed to the reticulated evolutionary history of most species due to meiotic sexual recombination in eukaryotes, or horizontal transfers of genetic materials in prokaryotes. Nonetheless, most genes do display topologically related phylogenies; this implies they form cohesive subsets (clusters). In this work, we compare popular clustering methods, and show how the performance of the normalized cut framework is efficient and statistically accurate when obtaining clusters on the set of gene trees based on the geodesic distance between them over the Billera-Holmes-Vogtmann (BHV) tree space. We proceed to present a computational study on the performance of different clustering methods with and without preprocessing under different distance metrics and using a series of dimension reduction techniques. Results: First, we show using simulated data that indeed the Ncut framework accurately clusters the set of gene trees given a species tree under the coalescent process. We then depict the success of our framework by comparing its performance to other clustering techniques, including k-means and hierarchical clustering. The main computational results can be summarized to the stellar performance of the Ncut framework even without dimension reduction, the similar performance portrayed by k-means and Ncut under most dimension reduction schemes, the utter failure of hierarchical clustering to accurately capture clusters, as well as the significantly better performance of the NJp method, as compared to MLE.

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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