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arXiv 1701.03095q-bio.GNstat.APstat.CO
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基于RNA测序数据的差异转录本使用的贝叶斯估计

Bayesian estimation of Differential Transcript Usage from RNA-seq data

Panagiotis Papastamoulis, Magnus Rattray

摘要:

下一代测序允许鉴定由差异表达的转录物组成的基因,该术语通常指总体表达水平的变化。一种特定类型的差异表达是差异转录物使用(DTU),并且靶向转录物的相对基因表达内的变化。本文的贡献是:(a)将cjBitSeq的使用扩展到DTU上下文中,这是一种先前引入的贝叶斯模型,最初设计用于识别整体表达水平的变化,以及(b)提出DRIMSeq的贝叶斯版本,这是一种用于推断DTU的频率论模型。cjBitSeq是基于读取的模型,并且通过MCMC采样对每个基因的每个转录本的潜在状态的空间执行完全贝叶斯推断。BayesDRIMSeq是一个基于计数的模型,它使用拉普拉斯近似来估计DTU模型相对于空模型的贝叶斯因子。使用最近的独立模拟研究以及真实的RNA测序数据集,将所提出的模型与现有模型进行基准测试。我们的研究结果表明,贝叶斯方法在精确度/召回率方面表现出与DRIMSeq相似的性能,但提供了更好的错误发现率校准。

英文摘要:

Next generation sequencing allows the identification of genes consisting of differentially expressed transcripts, a term which usually refers to changes in the overall expression level. A specific type of differential expression is differential transcript usage (DTU) and targets changes in the relative within gene expression of a transcript. The contribution of this paper is to: (a) extend the use of cjBitSeq to the DTU context, a previously introduced Bayesian model which is originally designed for identifying changes in overall expression levels and (b) propose a Bayesian version of DRIMSeq, a frequentist model for inferring DTU. cjBitSeq is a read based model and performs fully Bayesian inference by MCMC sampling on the space of latent state of each transcript per gene. BayesDRIMSeq is a count based model and estimates the Bayes Factor of a DTU model against a null model using Laplace's approximation. The proposed models are benchmarked against the existing ones using a recent independent simulation study as well as a real RNA-seq dataset. Our results suggest that the Bayesian methods exhibit similar performance with DRIMSeq in terms of precision/recall but offer better calibration of False Discovery Rate.

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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