Differential gene expression analysis with DEseq

Description

This is our main pipeline for comparing gene expression between two conditions. If replicates are provided, the pipeline will use DEseq2, for monoplicates the pipeline will use DEseq1. Of course, for monoplicates the p-value will be technical and will not reflect biological variability. The pipeline also produces PCA plots based DEseq normalized read count data.

Both DEseq 1 and 2 analyses are based on the negative binomial distribution.

How to perform differential gene expression analysis in SciDAP

DESeq

DESeq1

High-throughput sequencing assays such as RNA-Seq, ChIP-Seq or barcode counting provide quantitative readouts in the form of count data. To infer differential signal in such data correctly and with good statistical power, estimation of data variability throughout the dynamic range and a suitable error model are required. Simon Anders and Wolfgang Huber propose a method based on the negative binomial distribution, with variance and mean linked by local regression and present an implementation, DESeq, as an R/Bioconductor package

DESeq2

In comparative high-throughput sequencing assays, a fundamental task is the analysis of count data, such as read counts per gene in RNA-seq, for evidence of systematic changes across experimental conditions. Small replicate numbers, discreteness, large dynamic range and the presence of outliers require a suitable statistical approach. DESeq2, a method for differential analysis of count data, using shrinkage estimation for dispersions and fold changes to improve stability and interpretability of estimates. This enables a more quantitative analysis focused on the strength rather than the mere presence of differential expression.