Haosheng Zhou, Wei Lin, Sergio R Labra, Stuart A Lipton, Jeremy A Elman, Nicholas J Schork, Aaditya V Rangan
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引用次数: 0
摘要
许多分析基因-基因关系的传统方法都侧重于正相关和负相关,这两种关系都是一种 "对称 "关系。双聚类就是这样一种技术,它通常在样本子集中搜索表现出相关表达的基因子集。然而,基因也可以表现出 "非对称 "关系,例如布尔电路中使用的 "如果-那么 "关系。在本文中,我们开发了一种非常通用的方法,可用于检测基因表达数据中的双簇,这些数据涉及富集了这些 "布尔-非对称 "关系(BAR)的基因子集。这些 "布尔-非对称 "关系双集群可能对应于由非对称基因-基因相互作用驱动的异质性,例如,反映一个基因对另一个基因的调控作用,而不是更标准的对称相互作用。与在整个群体中搜索 BAR 的典型方法不同,BAR-双簇可以检测到只发生在部分样本中的非对称相互作用。我们将这一方法应用于单细胞 RNA 序列数据集,结果表明,在统计意义上显著的 BAR 双簇确实包含了更传统的 "布尔-对称 "双簇所不具备的额外信息。例如,BAR 双簇涉及不同的细胞子集,并突出了数据集中不同的基因通路。此外,通过结合布尔-非对称信号和布尔-对称信号,我们可以建立线性分类器,其效果优于仅使用传统布尔-对称信号建立的分类器。
Detecting Boolean Asymmetric Relationships with a Loop Counting Technique and its Implications for Analyzing Heterogeneity within Gene Expression Datasets.
Many traditional methods for analyzing gene-gene relationships focus on positive and negative correlations, both of which are a kind of 'symmetric' relationship. Biclustering is one such technique that typically searches for subsets of genes exhibiting correlated expression among a subset of samples. However, genes can also exhibit 'asymmetric' relationships, such as 'if-then' relationships used in boolean circuits. In this paper we develop a very general method that can be used to detect biclusters within gene-expression data that involve subsets of genes which are enriched for these 'boolean-asymmetric' relationships (BARs). These BAR-biclusters can correspond to heterogeneity that is driven by asymmetric gene-gene interactions, e.g., reflecting regulatory effects of one gene on another, rather than more standard symmetric interactions. Unlike typical approaches that search for BARs across the entire population, BAR-biclusters can detect asymmetric interactions that only occur among a subset of samples. We apply our method to a single-cell RNA-sequencing data-set, demonstrating that the statistically-significant BARbiclusters indeed contain additional information not present within the more traditional 'boolean-symmetric'-biclusters. For example, the BAR-biclusters involve different subsets of cells, and highlight different gene-pathways within the data-set. Moreover, by combining the boolean-asymmetric- and boolean-symmetricsignals, one can build linear classifiers which outperform those built using only traditional boolean-symmetric signals.
期刊介绍:
IEEE/ACM Transactions on Computational Biology and Bioinformatics emphasizes the algorithmic, mathematical, statistical and computational methods that are central in bioinformatics and computational biology; the development and testing of effective computer programs in bioinformatics; the development of biological databases; and important biological results that are obtained from the use of these methods, programs and databases; the emerging field of Systems Biology, where many forms of data are used to create a computer-based model of a complex biological system