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Old 04-27-2011, 02:00 AM   #1
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Default RNA-Seq: BM-Map: Bayesian Mapping of Multireads for Next-Generation Sequencing Data.

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BM-Map: Bayesian Mapping of Multireads for Next-Generation Sequencing Data.

Biometrics. 2011 Apr 22;

Authors: Ji Y, Xu Y, Zhang Q, Tsui KW, Yuan Y, Norris Jr C, Liang S, Liang H

Summary Next-generation sequencing (NGS) technology generates millions of short reads, which provide valuable information for various aspects of cellular activities and biological functions. A key step in NGS applications (e.g., RNA-Seq) is to map short reads to correct genomic locations within the source genome. While most reads are mapped to a unique location, a significant proportion of reads align to multiple genomic locations with equal or similar numbers of mismatches; these are called multireads. The ambiguity in mapping the multireads may lead to bias in downstream analyses. Currently, most practitioners discard the multireads in their analysis, resulting in a loss of valuable information, especially for the genes with similar sequences. To refine the read mapping, we develop a Bayesian model that computes the posterior probability of mapping a multiread to each competing location. The probabilities are used for downstream analyses, such as the quantification of gene expression. We show through simulation studies and RNA-Seq analysis of real life data that the Bayesian method yields better mapping than the current leading methods. We provide a C++ program for downloading that is being packaged into a user-friendly software.

PMID: 21517792 [PubMed - as supplied by publisher]



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