Cited by 263Gene expression and cancer classificationBioinformatics and Genomic NetworksGenomics and Phylogenetic Studies

The DOI matches its Crossref record; 62 of the 62 references it cites were found in a registry or an index.

Intensity-based hierarchical Bayes method improves testing for differentially expressed genes in microarray experiments

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Abstract

BACKGROUND: The small sample sizes often used for microarray experiments result in poor estimates of variance if each gene is considered independently. Yet accurately estimating variability of gene expression measurements in microarray experiments is essential for correctly identifying differentially expressed genes. Several recently developed methods for testing differential expression of genes utilize hierarchical Bayesian models to "pool" information from multiple genes. We have developed a statistical testing procedure that further improves upon current methods by incorporating the well-documented relationship between the absolute gene expression level and the variance of gene expression measurements into the general empirical Bayes framework. RESULTS: We present a novel Bayesian moderated-T, which we show to perform favorably in simulations, with two real, dual-channel microarray experiments and in two controlled single-channel experiments. In simulations, the new method achieved greater power while correctly estimating the true proportion of false positives, and in the analysis of two publicly-available "spike-in" experiments, the new method performed favorably compared to all tested alternatives. We also applied our method to two experimental datasets and discuss the additional biological insights as revealed by our method in contrast to the others. The R-source code for implementing our algorithm is freely available at http://eh3.uc.edu/ibmt. CONCLUSION: We use a Bayesian hierarchical normal model to define a novel Intensity-Based Moderated T-statistic (IBMT). The method is completely data-dependent using empirical Bayes philosophy to estimate hyperparameters, and thus does not require specification of any free parameters. IBMT has the strength of balancing two important factors in the analysis of microarray data: the degree of independence of variances relative to the degree of identity (i.e. t-tests vs. equal variance assumption), and the relationship between variance and signal intensity. When this variance-intensity relationship is weak or does not exist, IBMT reduces to a previously described moderated t-statistic. Furthermore, our method may be directly applied to any array platform and experimental design. Together, these properties show IBMT to be a valuable option in the analysis of virtually any microarray experiment.

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Metadata

Authors
Sartor, M. A., Tomlinson, C. R., Wesselkamper, S. C., Sivaganesan, S., Leikauf, G. D., & Medvedovic, M.
Affiliations
  • University of Cincinnati (US)
  • Dartmouth College (US)
  • Cincinnati Children's Hospital Medical Center (US)
Corresponding author
Medvedovic, Mario
Venue
BMC Bioinformatics
Published
2006-12
Volume
7
Issue
1
Pages
538-538
ISSN
1471-2105 (ISSN-L)
OpenAlex
W1570746489
Cited by
263
References
62
Citations by year
2026: 1 · 2024: 1 · 2023: 10 · 2022: 8 · 2021: 14 · 2020: 17 · 2019: 19 · 2018: 21 · 2017: 20 · 2016: 18 · 2015: 14 · 2014: 11 · 2013: 19 · 2012: 16
FWCI
4.57
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Bioinformatics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
National Institute of Environmental Health Sciences (P30ES006096, U01ES015675)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene expression and cancer classification
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bioinformatics and Genomic Networks
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
differentially expressed genes, microarray data analysis, Bayesian hierarchical model, empirical Bayes, false discovery rate, spike-in experiments, statistical power
MeSH terms
Animals, Bayes Theorem, Cells, Cultured, Computer Simulation, Female, Models, Genetic, Nickel, Signal Transduction, Transforming Growth Factor beta, Fibroblast Growth Factor 2, Receptors, Aryl Hydrocarbon, Mice, Knockout, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Mice, Aquaporin 5, Basic Helix-Loop-Helix Proteins

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