Statistical Applications in Genetics and Molecular Biology
Editor-in-Chief: Stumpf, Michael P.H.
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Detecting Differential Expression in RNA-sequence Data Using Quasi-likelihood with Shrunken Dispersion Estimates
1Statistical Engineering Division, National Institute of Standards and Technology
2Department of Statistics, Iowa State University
3University of Oxford
4Walter and Eliza Hall Institute of Medical Research
Citation Information: Statistical Applications in Genetics and Molecular Biology. Volume 11, Issue 5, ISSN (Online) 1544-6115, DOI: 10.1515/1544-6115.1826, October 2012
- Published Online:
Next generation sequencing technology provides a powerful tool for measuring gene expression (mRNA) levels in the form of RNA-sequence data. Method development for identifying differentially expressed (DE) genes from RNA-seq data, which frequently includes many low-count integers and can exhibit severe overdispersion relative to Poisson or binomial distributions, is a popular area of ongoing research. Here we present quasi-likelihood methods with shrunken dispersion estimates based on an adaptation of Smyth's (2004) approach to estimating gene-specific error variances for microarray data. Our suggested methods are computationally simple, analogous to ANOVA and compare favorably versus competing methods in detecting DE genes and estimating false discovery rates across a variety of simulations based on real data.
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