Cited by 103Genomics and Phylogenetic StudiesSingle-cell and spatial transcriptomicsRNA Research and Splicing

Transcriptome assembly and isoform expression level estimation from biased RNA-Seq reads

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Li, Wei, Jiang, Tao·2012·Bioinformatics

Abstract

Motivation: RNA-Seq uses the high-throughput sequencing technology to identify and quantify transcriptome at an unprecedented high resolution and low cost. However, RNA-Seq reads are usually not uniformly distributed and biases in RNA-Seq data post great challenges in many applications including transcriptome assembly and the expression level estimation of genes or isoforms. Much effort has been made in the literature to calibrate the expression level estimation from biased RNA-Seq data, but the effect of biases on transcriptome assembly remains largely unexplored. Results: Here, we propose a statistical framework for both transcriptome assembly and isoform expression level estimation from biased RNA-Seq data. Using a quasi-multinomial distribution model, our method is able to capture various types of RNA-Seq biases, including positional, sequencing and mappability biases. Our experimental results on simulated and real RNA-Seq datasets exhibit interesting effects of RNA-Seq biases on both transcriptome assembly and isoform expression level estimation. The advantage of our method is clearly shown in the experimental analysis by its high sensitivity and precision in transcriptome assembly and the high concordance of its estimated expression levels with quantitative reverse transcription–polymerase chain reaction data. Availability: CEM is freely available at http://www.cs.ucr.edu/~liw/cem.html. Contact: liw@cs.ucr.edu Supplementary information: Supplementary data are available at Bioinformatics online.

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  • At the transcript level, current methods correct for biases such as fragment length distribution from size selection, positional bias from RNA degradation and mRNA selection, and read-start sequence bias from random hexamer primer binding.

    “At the transcript level, sample-specific biases that current methods correct for include the fragment length distribution induced by size selection, positional bias along the transcript due to RNA degradation and mRNA selection techniques, and sequence-based bias in read start positions arising from the differential binding efficiency of random hexamer primers2,12-16”

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Authors
Li, W., & Jiang, T.
Affiliations
University of California, Riverside (US)
Corresponding author
Li, Wei
Venue
Bioinformatics
Published
2012-10-11
Volume
28
Issue
22
Pages
2914-2921
ISSN
  • 1367-4803 (ISSN-L)
  • 1367-4811
OpenAlex
W2136132915
Cited by
97
References
53
Citations by year
2026: 1 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 5 · 2021: 13 · 2020: 4 · 2019: 3 · 2018: 4 · 2017: 14 · 2016: 15 · 2015: 9 · 2014: 11 · 2013: 9 · 2012: 1
FWCI
3.85
Type
journal article
Language
en
Open access
Locations
  • Bioinformatics (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Allergy and Infectious Diseases (R01AI078885)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
Keywords
transcriptome assembly, position bias, sequencing bias, CEM
MeSH terms
Algorithms, Humans, Transcription, Genetic, Sequence Analysis, RNA, Protein Isoforms, Gene Expression Profiling, High-Throughput Nucleotide Sequencing

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