ExoFILT: Transfer learning for robust and accelerated analysis of exocytosis single-particle tracking data

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ID: 324268
2026
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Abstract
MOTIVATION: Understanding constitutive exocytosis at the molecular level requires quantitative characterization of protein dynamics during the process. Single-particle tracking allows the measurement of protein dynamics in living cells. However, identifying bona fide exocytic events requires extensive manual annotation, limiting throughput and introducing personal biases that affect reproducibility. RESULTS: We present ExoFILT, a deep learning-based classifier designed to identify exocytic events in single-particle tracking data, using the exocyst complex as a reference. Trained via transfer learning on simulated and experimental data, ExoFILT reduces the time required for manual annotation by ten-fold while improving measurement consistency across researchers. When applied to simultaneous dual-color time-lapse movies, ExoFILT enabled the systematic quantification of temporal relationships between exocytic proteins. The increased throughput uncovered distinct subpopulations of exocytic events with differential molecular composition (e.g., events with and without detectable levels of Sec1), underscoring the potential of ExoFILT to reveal mechanistic insights into exocytosis. AVAILABILITY: All raw data and code used for this manuscript is available in GitHub (https://github.com/GallegoLab/ExoFILT) and Zenodo (https://zenodo.org/records/18962705). SUPPLEMENTARY INFORMATION: Supplementary data are available at Bioinformatics online.
Reference Key
openalex_W7196932495 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Eric Kramer, Laura I Betancur, Sasha Meek, Sébastien Tosi, Carlo Manzo, Baldo Oliva, Oriol Gallego
Journal BMC Bioinformatics
Year 2026
DOI
10.1093/bioinformatics/btag589
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