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arXiv 1303.5889q-bio.GN
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利用蛋白质结构识别非随机体细胞突变的图论方法

A Graph Theoretic Approach to Utilizing Protein Structure to Identify Non-Random Somatic Mutations

Gregory Ryslik, Yuwei Cheng, Kei-Hoi Cheung, Yorgo Modis, Hongyu Zhao

摘要:

背景:众所周知,癌症的发生是由基因组中体细胞突变的积累引起的。对于癌基因,目前的研究表明,有一小部分“驱动”突变主要负责肿瘤发生。此外,由于最近在治疗这些驱动突变及其产生的肿瘤方面的一些药理学成功,已经开发了多种方法来使用诸如机器学习和突变聚类的方法来鉴定潜在的驱动突变。我们提出了一种新的方法,通过考虑蛋白质的三级结构,通过图论方法,增加我们的能力,以确定突变簇。结果如下:我们设计并实现了GraphPAC(Graph Protein氨基酸聚类),以识别突变聚类,同时考虑蛋白质的空间结构。使用GraphPAC,我们能够检测已知表现出突变聚类的蛋白质中的新簇,以及基于当前方法在没有先前聚类证据的情况下识别蛋白质中的簇。具体而言,通过利用蛋白质数据库(PDB)中可用的空间信息以及癌症体细胞突变目录(COSMIC)中的突变数据,GraphPAC识别了众所周知的癌基因(如EGFR和KRAS)中的新突变簇。此外,通过利用图论来解释三级结构,GraphPAC识别了DPP4,NRP1和其他未被现有方法识别的蛋白质中的簇。R包可在以下网址获得:http://bioconductor.org/packages/release/bioc/html/GraphPAC.html GraphPAC提供了iPAC的替代方案,并在考虑蛋白质三级结构时利用图论方法识别潜在的激活驱动突变时扩展了当前方法。

英文摘要:

Background: It is well known that the development of cancer is caused by the accumulation of somatic mutations within the genome. For oncogenes specifically, current research suggests that there is a small set of "driver" mutations that are primarily responsible for tumorigenesis. Further, due to some recent pharmacological successes in treating these driver mutations and their resulting tumors, a variety of methods have been developed to identify potential driver mutations using methods such as machine learning and mutational clustering. We propose a novel methodology that increases our power to identify mutational clusters by taking into account protein tertiary structure via a graph theoretical approach. Results: We have designed and implemented GraphPAC (Graph Protein Amino Acid Clustering) to identify mutational clustering while considering protein spatial structure. Using GraphPAC, we are able to detect novel clusters in proteins that are known to exhibit mutation clustering as well as identify clusters in proteins without evidence of prior clustering based on current methods. Specifically, by utilizing the spatial information available in the Protein Data Bank (PDB) along with the mutational data in the Catalogue of Somatic Mutations in Cancer (COSMIC), GraphPAC identifies new mutational clusters in well known oncogenes such as EGFR and KRAS. Further, by utilizing graph theory to account for the tertiary structure, GraphPAC identifies clusters in DPP4, NRP1 and other proteins not identified by existing methods. The R package is available at: http://bioconductor.org/packages/release/bioc/html/GraphPAC.html Conclusion: GraphPAC provides an alternative to iPAC and an extension to current methodology when identifying potential activating driver mutations by utilizing a graph theoretic approach when considering protein tertiary structure.

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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