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arXiv 1303.7002stat.MEstat.AP
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基于距离的成对异质基因组数据关联性检验

A Distance-Based Test of Association Between Paired Heterogeneous Genomic Data

Christopher Minas, Edward Curry, Giovanni Montana

摘要:

由于快速的技术进步,可以从给定的生物样品获得广泛的不同测量,包括单核苷酸多态性、拷贝数变异、基因表达水平、DNA甲基化和蛋白质组学谱。这些不同的测量提供了表征生物多样性的某个方面的手段,并且广泛关注的基本问题涉及发现不同数据类型之间的共享变异模式。这种数据类型是异构的,因为它们代表在非常不同的尺度上进行的测量或由非常不同的数据结构描述。我们提出了一个基于距离的统计检验,广义RV(GRV)的测试,以评估是否有一个共同的和非随机的模式之间的变异性配对生物测量从相同的随机样本。测量通过距离测量进入测试,可以选择距离测量来捕获数据的特定方面。提出了一种近似零分布来计算封闭形式的p值,而不需要执行昂贵的蒙特卡罗置换程序。与经典的距离矩阵之间的关联的Mantel测试相比,GRV测试已被发现在许多模拟设置中更强大。我们还报告了应用GRV测试检测生物学途径,其中遗传变异与卵巢癌样本中基因表达水平的变化相关,并提出了从两个独立队列中获得的结果。

英文摘要:

Due to rapid technological advances, a wide range of different measurements can be obtained from a given biological sample including single nucleotide polymorphisms, copy number variation, gene expression levels, DNA methylation and proteomic profiles. Each of these distinct measurements provides the means to characterize a certain aspect of biological diversity, and a fundamental problem of broad interest concerns the discovery of shared patterns of variation across different data types. Such data types are heterogeneous in the sense that they represent measurements taken at very different scales or described by very different data structures. We propose a distance-based statistical test, the generalized RV (GRV) test, to assess whether there is a common and non-random pattern of variability between paired biological measurements obtained from the same random sample. The measurements enter the test through distance measures which can be chosen to capture particular aspects of the data. An approximate null distribution is proposed to compute p-values in closed-form and without the need to perform costly Monte Carlo permutation procedures. Compared to the classical Mantel test for association between distance matrices, the GRV test has been found to be more powerful in a number of simulation settings. We also report on an application of the GRV test to detect biological pathways in which genetic variability is associated to variation in gene expression levels in ovarian cancer samples, and present results obtained from two independent cohorts.

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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