Cited by 497Genomics and Phylogenetic StudiesGene expression and cancer classificationBioinformatics and Genomic Networks

Transcript length bias in RNA-seq data confounds systems biology

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Oshlack, Alicia, Wakefield, Matthew J·2009·Biology Direct

Abstract

BACKGROUND: Several recent studies have demonstrated the effectiveness of deep sequencing for transcriptome analysis (RNA-seq) in mammals. As RNA-seq becomes more affordable, whole genome transcriptional profiling is likely to become the platform of choice for species with good genomic sequences. As yet, a rigorous analysis methodology has not been developed and we are still in the stages of exploring the features of the data. RESULTS: We investigated the effect of transcript length bias in RNA-seq data using three different published data sets. For standard analyses using aggregated tag counts for each gene, the ability to call differentially expressed genes between samples is strongly associated with the length of the transcript. CONCLUSION: Transcript length bias for calling differentially expressed genes is a general feature of current protocols for RNA-seq technology. This has implications for the ranking of differentially expressed genes, and in particular may introduce bias in gene set testing for pathway analysis and other multi-gene systems biology analyses. REVIEWERS: This article was reviewed by Rohan Williams (nominated by Gavin Huttley), Nicole Cloonan (nominated by Mark Ragan) and James Bullard (nominated by Sandrine Dudoit).

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  • Power estimates apply to average gene expression, but because RNA-seq dynamic ranges are large, highly expressed genes are more likely to be detected as differentially expressed than low-count genes.

    “It should be noted that these estimates apply to the average gene expression level, but as dynamic ranges in RNA-seq data are large, the probability that highly expressed genes will be detected as differentially expressed is greater than that for low-count genes [192].”

    From A survey of best practices for RNA-seq data analysis (2016) · cites this paper as [192]

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Authors
Oshlack, A., & Wakefield, M. J.
Affiliations
Walter and Eliza Hall Institute of Medical Research (AU)
Corresponding author
Oshlack, Alicia
Venue
Biology Direct
Published
2009
Volume
4
Issue
1
Pages
14
ISSN
1745-6150 (ISSN-L)
OpenAlex
W2114504176
Cited by
497
References
12
Citations by year
2026: 6 · 2025: 8 · 2024: 16 · 2023: 14 · 2022: 24 · 2021: 35 · 2020: 12 · 2019: 29 · 2018: 30 · 2017: 36 · 2016: 33 · 2015: 39 · 2014: 39 · 2013: 37 · 2012: 44
FWCI
18.63
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Biology Direct (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • 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
Keywords
RNA-seq, differentially expressed genes, gene expression profiling, pathway analysis, systems biology
MeSH terms
Base Sequence, Humans, RNA, Messenger, Transcription, Genetic, Bias, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Systems Biology

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