Cited by 870Gene expression and cancer classificationGenomics and Phylogenetic StudiesBioinformatics and Genomic Networks

Moderated statistical tests for assessing differences in tag abundance

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Robinson, Mark D., Smyth, Gordon K.·2007·Bioinformatics

Abstract

Motivation: Digital gene expression (DGE) technologies measure gene expression by counting sequence tags. They are sensitive technologies for measuring gene expression on a genomic scale, without the need for prior knowledge of the genome sequence. As the cost of sequencing DNA decreases, the number of DGE datasets is expected to grow dramatically. Various tests of differential expression have been proposed for replicated DGE data using binomial, Poisson, negative binomial or pseudo-likelihood (PL) models for the counts, but none of the these are usable when the number of replicates is very small. Results: We develop tests using the negative binomial distribution to model overdispersion relative to the Poisson, and use conditional weighted likelihood to moderate the level of overdispersion across genes. Not only is our strategy applicable even with the smallest number of libraries, but it also proves to be more powerful than previous strategies when more libraries are available. The methodology is equally applicable to other counting technologies, such as proteomic spectral counts. Availability: An R package can be accessed from http://bioinf.wehi.edu.au/resources/ Contact: smyth@wehi.edu.au Supplementary information: http://bioinf.wehi.edu.au/resources/

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  • The quasi-likelihood framework in edgeR was used to handle the pronounced variability of single-cell expression states.

    “and the quasi-likelihood framework within edgeR to handle the pronounced variability of the single cell expression states.”
  • A negative binomial model in edgeR was used to account for the sparse single-cell count matrix.

    “We used the negative binomial (NB) model implemented in edgeR (3.10.0)79–83 for our single cell differential expression analysis to explicitly account for the sparse count matrix”

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Authors
Robinson, M. D., & Smyth, G. K.
Affiliations
The University of Melbourne (AU)
Corresponding author
Smyth, Gordon K.
Venue
Bioinformatics
Published
2007-09-19
Volume
23
Issue
21
Pages
2881-2887
ISSN
  • 1367-4803 (ISSN-L)
  • 1367-4811
OpenAlex
W2145416275
Cited by
856
References
28
Citations by year
2026: 9 · 2025: 25 · 2024: 43 · 2023: 44 · 2022: 44 · 2021: 56 · 2020: 62 · 2019: 61 · 2018: 63 · 2017: 63 · 2016: 82 · 2015: 58 · 2014: 70 · 2013: 66 · 2012: 39
FWCI
5.01
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • Bioinformatics (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Funders
National Health and Medical Research Council (406657)
Topics
  • 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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
Keywords
differential gene expression, digital gene expression, negative binomial distribution, overdispersion, gene expression counts, spectral counts, R package
MeSH terms
Algorithms, Computer Simulation, Data Interpretation, Statistical, Models, Genetic, Signal Processing, Computer-Assisted, Models, Statistical, Poisson Distribution, Likelihood Functions, Sequence Analysis, DNA, Expressed Sequence Tags, Gene Expression Profiling

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