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We focus on differential expression (DE) analysis using RNA-seq data in the presence of multiple treatment conditions.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>We propose a novel method, multiDE, for facilitating DE analysis using RNA-seq read count data with multiple treatment conditions. The read count is assumed to follow a log-linear model incorporating two factors (i.e., condition and gene), where an interaction term is used to quantify the association between gene and condition. The number of the degrees of freedom is reduced to one through the first order decomposition of the interaction, leading to a dramatically power improvement in testing DE genes when the number of conditions is greater than two. In our simulation situations, multiDE outperformed the benchmark methods (i.e. edgeR and DESeq2) even if the underlying model was severely misspecified, and the power gain was increasing in the number of conditions. In the application to two real datasets, multiDE identified more biologically meaningful DE genes than the benchmark methods. An R package implementing multiDE is available publicly at <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"http:\/\/homepage.fudan.edu.cn\/zhangh\/softwares\/multiDE\">http:\/\/homepage.fudan.edu.cn\/zhangh\/softwares\/multiDE<\/jats:ext-link>.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>When the number of conditions is two, multiDE performs comparably with the benchmark methods. When the number of conditions is greater than two, multiDE outperforms the benchmark methods.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12859-016-1111-9","type":"journal-article","created":{"date-parts":[[2016,6,23]],"date-time":"2016-06-23T06:28:27Z","timestamp":1466663307000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["multiDE: a dimension reduced model based statistical method for differential expression analysis using RNA-sequencing data with multiple treatment conditions"],"prefix":"10.1186","volume":"17","author":[{"given":"Guangliang","family":"Kang","sequence":"first","affiliation":[]},{"given":"Li","family":"Du","sequence":"additional","affiliation":[]},{"given":"Hong","family":"Zhang","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2016,6,22]]},"reference":[{"issue":"7","key":"1111_CR1","doi-asserted-by":"publisher","first-page":"621","DOI":"10.1038\/nmeth.1226","volume":"5","author":"A Mortazavi","year":"2008","unstructured":"Mortazavi A, Williams BA, McCue K, Schaeffer L, Wold B. 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