REACTOR: REgulon Activity analysis and Comparison Tool for single-cell transcriptOmics Research.

Lindén, Markus; Zúñiga Norman, Sebastian I; Välikangas, Tommi; Junttila, Sini; Suomi, Tomi; Rytkönen, Kalle T; Elo, Laura L · Bioinformatics · 2026

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Abstract

We introduce REACTOR, a computational tool designed to detect differential activity of transcriptional regulators and their target genes (regulons) in single-cell RNA-sequencing data. It expands the currently available framework for regulon analysis by introducing a robust statistical test to detect differential regulon activity between conditions, such as disease versus control, with multiple replicates. By contrasting different conditions, REACTOR enables identification of key condition- and cell type-specific regulons. To demonstrate the use of REACTOR, we illustrate its performance in a publicly available COVID-19 dataset. REACTOR R-package together with an implementation vignette are available at https://www.github.com/elolab/REACTOR.

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