Cited by 560Bioinformatics and Genomic NetworksGene expression and cancer classificationGenomics and Phylogenetic Studies

ROAST: rotation gene set tests for complex microarray experiments

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Wu, Di, Lim, Elgene, Vaillant, François, Asselin-Labat, Marie-Liesse, Visvader, Jane E., Smyth, Gordon K.·2010·Bioinformatics

Abstract

MOTIVATION: A gene set test is a differential expression analysis in which a P-value is assigned to a set of genes as a unit. Gene set tests are valuable for increasing statistical power, organizing and interpreting results and for relating expression patterns across different experiments. Existing methods are based on permutation. Methods that rely on permutation of probes unrealistically assume independence of genes, while those that rely on permutation of sample are suitable only for two-group comparisons with a good number of replicates in each group. RESULTS: We present ROAST, a statistically rigorous gene set test that allows for gene-wise correlation while being applicable to almost any experimental design. Instead of permutation, ROAST uses rotation, a Monte Carlo technology for multivariate regression. Since the number of rotations does not depend on sample size, ROAST gives useful results even for experiments with minimal replication. ROAST allows for any experimental design that can be expressed as a linear model, and can also incorporate array weights and correlated samples. ROAST can be tuned for situations in which only a subset of the genes in the set are actively involved in the molecular pathway. ROAST can test for uni- or bi-direction regulation. Probes can also be weighted to allow for prior importance. The power and size of the ROAST procedure is demonstrated in a simulation study, and compared to that of a representative permutation method. Finally, ROAST is used to test the degree of transcriptional conservation between human and mouse mammary stems. AVAILABILITY: ROAST is implemented as a function in the Bioconductor package limma available from www.bioconductor.org.

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  • Rotation technology permits statistical significance to be tested for sets of genes for any linear model contrast.

    “One way that this is done is by rotation technology, which permits statistical significance to be tested for sets of genes for any linear model contrast (55).”
  • The roast and mroast functions implement a self-contained test of whether any worthwhile subset of the specified set of genes is differentially expressed.

    “The roast and mroast functions implement a self-contained test of whether any worthwhile subset of the specified set of genes is differentially expressed (55).”

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Authors
Wu, D., Lim, E., Vaillant, F., Asselin-Labat, M.-L., Visvader, J. E., & Smyth, G. K.
Affiliations
The University of Melbourne (AU)
Corresponding author
Smyth, Gordon K.
Venue
Bioinformatics
Published
2010-07-07
Volume
26
Issue
17
Pages
2176-2182
ISSN
  • 1367-4803 (ISSN-L)
  • 1367-4811
OpenAlex
W2095900642
Cited by
560
References
31
Citations by year
2026: 25 · 2025: 29 · 2024: 52 · 2023: 45 · 2022: 39 · 2021: 68 · 2020: 57 · 2019: 40 · 2018: 30 · 2017: 42 · 2016: 30 · 2015: 42 · 2014: 19 · 2013: 16 · 2012: 20
FWCI
5.34
Type
journal article
Language
en
Open access
Locations
  • Bioinformatics (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc)
Funders
  • Medical Research Council
  • National Health and Medical Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene expression and cancer classification
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
differential gene expression, microarray data, rotation, pathway analysis, mammary stem cells, human-mouse comparison, limma
MeSH terms
Algorithms, Animals, Humans, Linear Models, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Mice

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