Observation weights to unlock bulk RNA-seq tools for zero inflation and single-cell applications
Koen Van den Berge,
Michael I. Love,
Mark D. Robinson,
Posted 18 Jan 2018
bioRxiv DOI: 10.1101/250126 (published DOI: 10.1186/s13059-018-1406-4)
Posted 18 Jan 2018
Dropout events in single-cell transcriptome sequencing (scRNA-seq) cause many transcripts to go undetected and induce an excess of zero read counts, leading to power issues in differential expression (DE) analysis. This has triggered the development of bespoke scRNA-seq DE methods to cope with zero inflation. Recent evaluations, however, have shown that dedicated scRNA-seq tools provide no advantage compared to traditional bulk RNA-seq tools. We introduce a weighting strategy, based on a zero-inflated negative binomial (ZINB) model, that identifies excess zero counts and generates gene and cell-specific weights to unlock bulk RNA-seq DE pipelines for zero-inflated data, boosting performance for scRNA-seq.
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