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arXiv 1806.09896stat.AP
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高通量生物数据的贝叶斯多研究因子分析

Bayesian Multi-study Factor Analysis for High-throughput Biological Data

Roberta De Vito, Ruggero Bellio, Lorenzo Trippa, Giovanni Parmigiani

摘要:

本文提出了一种新的建模策略,用于多个高通量生物研究的联合无监督分析。与多研究因素分析一样,我们的目标是确定研究之间共享的共同因素和研究特定因素。我们的方法是由生物医学研究中越来越多的高通量研究所激发的,我们的案例研究中考虑的乳腺肿瘤表达数据的综合集就是例证。为了处理高维研究,我们使用贝叶斯方法扩展了多研究因子分析,该方法具有稀疏性。具体来说,我们推广稀疏贝叶斯无限因子模型多个研究。我们还设计了新的解决方案,用于识别的加载矩阵:我们恢复感兴趣的加载矩阵事后,通过适应正交Procrustes方法。在计算上,我们提出了一个有效的和快速的吉布斯抽样的方法。通过广泛的模拟分析,我们表明,所提出的方法在一系列不同的情况下表现得非常好,并优于标准的因子分析在所有的情况下识别可复制的信号在无监督的基因组应用。我们对七项研究中乳腺癌基因表达的分析结果确定了可复制的基因模式,这些基因模式与众所周知的乳腺癌途径明显相关。一个R包在GitHub上实现并可用。

英文摘要:

This paper presents a new modeling strategy for joint unsupervised analysis of multiple high-throughput biological studies. As in Multi-study Factor Analysis, our goals are to identify both common factors shared across studies and study-specific factors. Our approach is motivated by the growing body of high-throughput studies in biomedical research, as exemplified by the comprehensive set of expression data on breast tumors considered in our case study. To handle high-dimensional studies, we extend Multi-study Factor Analysis using a Bayesian approach that imposes sparsity. Specifically, we generalize the sparse Bayesian infinite factor model to multiple studies. We also devise novel solutions for the identification of the loading matrices: we recover the loading matrices of interest ex-post, by adapting the orthogonal Procrustes approach. Computationally, we propose an efficient and fast Gibbs sampling approach. Through an extensive simulation analysis, we show that the proposed approach performs very well in a range of different scenarios, and outperforms standard Factor analysis in all the scenarios identifying replicable signal in unsupervised genomic applications. The results of our analysis of breast cancer gene expression across seven studies identified replicable gene patterns, clearly related to well-known breast cancer pathways. An R package is implemented and available on GitHub.

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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