Cis-TERN: a graph-based method to integrate single-cell chromatin accessibility with gene expression data to infer the pseudotime ordering of cells

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ID: 332435
2026
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Abstract
Abstract Motivation Pseudotime ordering methods computationally arrange individually sequenced cells along a continuous trajectory to infer their progression through biological processes. Chromatin accessibility at regulatory elements is pivotal for orchestrating the timing of gene expression during cellular differentiation. However, data sparsity and discrete grouping imposed by clustering-based approaches, often obscures subtle cell-state transitions and intermediate populations. Results Here, we introduce Cis-TERN (Cis-Temporally Encoded Regulation Network), a graph-based method that integrates scRNA-seq and scATAC-seq to infer a pseudotime ordering of cells. Exploiting the fact that distal cis chromatin accessibility often precedes gene activation, Cis-TERN builds a directed bipartite graph between scRNA-seq and scATAC-seq cells with edge weights determined by either proximal or distal accessibility. Through network diffusion, Cis-TERN assigns continuous pseudotime scores to all cells. Cis-TERN infers cellular pseudotime without the need for prior biological knowledge, such as specifying a root cell type, thereby enabling unbiased reconstruction of differentiation from data alone. We show that our scores align with known lineages in healthy and tumor-derived hematopoietic cells. Additionally, Cis-TERN is able to trace individual cancer cells back to progenitor cell types. Our approach establishes a framework for leveraging chromatin accessibility and gene expression jointly to learn the timing of cell state progression. Availability and implementation Cis-TERN is available at https://github.com/pawelab/Cis-TERN.
Reference Key
openalex_W7222104053 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Ameya Gokhale, Pawel F. Przytycki
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Journal Bioinformatics advances
Year 2026
DOI
10.1093/bioadv/vbag313
URL
https://doi.org/10.1093/bioadv/vbag313
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