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arXiv 1002.0559q-bio.PEq-bio.QM
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系统发育ReconstructioN(PHYRN)理论

Theories on PHYlogenetic ReconstructioN (PHYRN)

Gaurav Bhardwaj, Zhenhai Zhang, Yoojin Hong, Kyung Dae Ko, Gue Su Chang, Evan J. Smith, Lindsay A. Kline, D. Nicholas Hartranft, Edward C. Holmes, Randen L. Pat… 展开作者

Gaurav Bhardwaj, Zhenhai Zhang, Yoojin Hong, Kyung Dae Ko, Gue Su Chang, Evan J. Smith, Lindsay A. Kline, D. Nicholas Hartranft, Edward C. Holmes, Randen L. Patterson, Damian B. van Rossum

摘要:

无法解决高度分化/快速进化的蛋白质家族的深层节点关系是阻碍进化研究的主要因素。在这篇文章中,我们提出了一个多序列比对(MSA)独立的方法来推断进化关系。我们以前证明,使用位置特异性评分矩阵(PSSMs)建立的系统发育谱能够构建信息丰富的进化历史(1;2)。在这篇文章中,我们从理论上推导出PSSM,特别是来自用于构建系统发育树的查询序列,将改善这种方法的快速进化蛋白质的研究。为了验证这一理论,我们对基准蛋白质超家族(逆转录酶(RT))以及模拟数据集进行了系统发育分析。当我们比较从我们的方法,系统发生重建(PHYRN),与其他MSA依赖的方法,我们观察到,PHYRN提供了一个4- 100倍的增加,在深节点的准确测量的结果。由于系统发育概况被用作信息源,而不是MSA,我们提出PHYRN作为一种范式转变,在研究进化时,MSA方法失败。也许最重要的是,由于我们的计算方法的改进和大量测序数据的可用性,PHYRN可扩展到数千个序列。考虑到PHYRNs对任何蛋白质家族的适应性,该方法可以作为一种工具,用于解决快速进化/高度分化的蛋白质家族的进化研究中的模糊性。

英文摘要:

The inability to resolve deep node relationships of highly divergent/rapidly evolving protein families is a major factor that stymies evolutionary studies. In this manuscript, we propose a Multiple Sequence Alignment (MSA) independent method to infer evolutionary relationships. We previously demonstrated that phylogenetic profiles built using position specific scoring matrices (PSSMs) are capable of constructing informative evolutionary histories(1;2). In this manuscript, we theorize that PSSMs derived specifically from the query sequences used to construct the phylogenetic tree will improve this method for the study of rapidly evolving proteins. To test this theory, we performed phylogenetic analyses of a benchmark protein superfamily (reverse transcriptases (RT)) as well as simulated datasets. When we compare the results obtained from our method, PHYlogenetic ReconstructioN (PHYRN), with other MSA dependent methods, we observe that PHYRN provides a 4- to 100-fold increase in accurate measurements at deep nodes. As phylogenetic profiles are used as the information source, rather than MSA, we propose PHYRN as a paradigm shift in studying evolution when MSA approaches fail. Perhaps most importantly, due to the improvements in our computational approach and the availability of vast amount of sequencing data, PHYRN is scalable to thousands of sequences. Taken together with PHYRNs adaptability to any protein family, this method can serve as a tool for resolving ambiguities in evolutionary studies of rapidly evolving/highly divergent protein families.

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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