The lack of benchmark data sets with inbuilt ground-truth makes it challenging to compare the performance of existing long-read isoform detection and differential expression analysis workflows. Here, we present a benchmark experiment using two human lung adenocarcinoma cell lines that were each profiled in triplicate together with synthetic, spliced, spike-in RNAs (sequins). Samples were deeply sequenced on both Illumina short-read and Oxford Nanopore Technologies long-read platforms. Alongside the ground-truth available via the sequins, we created in silico mixture samples to allow performance assessment in the absence of true positives or true negatives. Our results show that StringTie2 and bambu outperformed other tools from the six isoform detection tools tested, DESeq2, edgeR and limma-voom were best among the five differential transcript expression tools tested and there was no clear front-runner for performing differential transcript usage analysis between the five tools compared, which suggests further methods development is needed for this application.
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RNA-seq data are available from Gene Expression Omnibus (GEO) under accession numbers GSE172421 (main benchmarking data set) and GSE227000 (laboratory-based mixture of replicate 1). RNA-seq data from the pure and laboratory-based mixture samples (short-read) of Holik et al.17 are available from GEO under accession number GSE64098. The GENCODE Human Release 33 genome, transcriptome and gene annotation files are available from https://www.gencodegenes.org/human/release_33.html. The RNA sequin decoy chromosome, gene annotation file and transcript abundance information are available from https://www.sequinstandards.com/resources/ (registration is required to access).
Code used to perform these analyses and generate the figures are available from https://github.com/XueyiDong/LongReadBenchmark. All analyses for DTE, DTU and comparisons of methods performance were run in R v.4.1.0 (ref. 58). Results were visualized using ggplot2 v.3.3.5 (ref. 59) and UpSetR v.1.4.0 (ref. 60).
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We thank C. Weeden and M.-L. Asselin-Labat (Personalized Oncology Division, The Walter and Eliza Hall Institute of Medical Research) for providing the cell lines used in this study. P.L.B., G.K.S. and C.W.L. were supported by the Chan Zuckerberg Initiative Essential Open Source Software for Science Program (grant nos. 2019-207283 and 2021-237445) and M.E.R. was supported by Australian National Health and Medical Research Council Investigator grant (no. 2017257). The funders had no role in study design, data collection and analysis, decision to publish or preparation of the manuscript.
The authors declare no competing interests.
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Dong, X., Du, M.R.M., Gouil, Q. et al. Benchmarking long-read RNA-sequencing analysis tools using in silico mixtures. Nat Methods 20, 1810–1821 (2023). https://doi.org/10.1038/s41592-023-02026-3