GateLabR

Interactive manual gating for SingleCellExperiment objects in R / Shiny.

Open-source flow cytometry and CyTOF (mass cytometry) gating app for R / Shiny — with FCS import, fluorescence compensation, Boolean population trees, and Gating-ML round-trip, all persisted inside the object.

📖 Documentation & Getting Started

GateLabR is a desktop-style Shiny application for hand-gating flow cytometry and mass cytometry (CyTOF) data directly on SingleCellExperiment objects. It slots into Bioconductor-based analysis pipelines (e.g. CATALYST, diffcyt) where the events already live in R as an SCE and you want a fast, reproducible alternative to round-tripping through FlowJo or Cytobank just to draw a few gates.

Gates are drawn on an interactive D3.js canvas, and gates, populations, scales and illustration settings are persisted inside the SCE itself via metadata(), so loading the SCE again restores the entire workspace.

Features

• Draw and edit gates interactively. Polygon and rectangle gates on any pair of channels, with click-and-drag vertex editing, snap-to-grid, undo / redo, and per-gate colour and label.
• Boolean population trees. Build hierarchies of populations from gate references with AND / OR logic; counts and percentages update live.
• Flow and CyTOF modes. Auto-detects the instrument type from channel names. Flow uses per-channel logicle for fluorescence and arcsinh for FSC / SSC scatter, with editable W and cofactor; CyTOF channels use arcsinh (cofactor 5).
• Compensation. When an .fcs carries an embedded spillover matrix ($SPILLOVER), it can be applied to the raw fluorescence data before gating — toggled on/off from the Scales tab, with a read-only matrix viewer. Scatter and time channels are left untouched. Defaults off; apply it before drawing gates, since it changes the linear space the gates live in. Already-compensated / spectral-unmixed and CyTOF files (no usable matrix) hide the option.
• Cytobank-compatible Gating-ML 2.0 import / export. Round-trip gates through Cytobank, FlowJo and other ISAC-compliant tools.
• Workspace persistence. Gates, populations, scales and illustration settings are saved inside the SCE (metadata(sce)$gating_workspace) and re-loaded automatically.
• FCS export. Export gated populations as FCS files, optionally split by sample_id.
• Sample filter and multi-sample overlay. Filter by any colData column and overlay multiple samples with distinct colours.
• Statistics tab. Per-population, per-channel summary stats (count, % parent / total, median, mean, geometric mean, SD, CV) exportable to CSV.
• UMAP tab. Overlay any populations on a precomputed UMAP and export as SVG / PDF.
• Cell-division profiler. A CFSE / CellTrace dye-dilution tab: draggable per-sample division gates on a 1-D histogram (Div0…DivN), a marker-vs-dye biplot with density contours, and per-cell division calls written back to colData.
• Composition preview. A Proportions tab for quick stacked-bar and boxplot previews of any colData composition (e.g. cluster or division proportions by condition), with per-sample averaging and faceting.
• Figure export. Strategy and Illustration tabs render publication-style multi-panel grids; SVG export uses gridSVG to produce Adobe Illustrator- friendly grouped vector files (rasterised data, vector axes / gates / labels).

How GateLabR compares

GateLabR fills a specific gap: an interactive GUI for gating that lives natively on a SingleCellExperiment, so it slots into a Bioconductor pipeline instead of replacing it — while keeping full R access to the same object.

	GateLabR	FlowJo / Cytobank	CytoExploreR / flowGate
Interface	GUI (Shiny) + full R access	GUI (proprietary)	R, with interactive gating helpers
Data object	SingleCellExperiment (Bioconductor-native)	proprietary workspace	GatingSet (flowWorkspace)
Cost / licence	Free, MIT, open source	Commercial	Free, open source
Flow and CyTOF	Yes (auto-detected)	Flow-focused	Flow-focused
Gates persist in the object	Yes — in metadata(); reload restores everything	Workspace files	GatingSet on disk
Gating-ML round-trip	Yes (Cytobank-compatible)	Yes	Partial
Downstream hand-off	Populations → colData for diffcyt / CATALYST / any SCE tool	Export gated FCS	GatingSet → downstream

If your data already lives in R as an SCE and you want to draw a few gates without round-tripping through FlowJo or Cytobank — but would rather point and click than write gate coordinates by hand — that's what GateLabR is for.

Installation

GateLabR can be used either as an installed R package or straight from a clone.

Option A — install as a package (recommended)

# install.packages("remotes")            # if needed
# Bioconductor dependencies are resolved automatically; if you don't already
# have BiocManager, install it first: install.packages("BiocManager")
remotes::install_github("david-priest/GateLabR")

library(GateLabR)
launchGatingApp()        # or launchGatingApp(my_sce)

Option B — clone and run from source

# 1. git clone https://github.com/david-priest/GateLabR.git
# 2. From an R session, install dependencies once (CRAN + Bioconductor):
source("path/to/GateLabR/install_dependencies.R")
# 3. Source the launcher and run (see Quick start):
source("path/to/GateLabR/launch.R")
launchGatingApp()

Dependencies (installed automatically by Option A, or by install_dependencies.R for Option B):

• CRAN: shiny, DT, jsonlite, base64enc, uuid, sp, gridSVG, png, ggplot2
• Bioconductor: SingleCellExperiment, SummarizedExperiment, S4Vectors, flowCore, xml2

R ≥ 4.2 and Bioconductor ≥ 3.16 are recommended.

Quick start

# Installed package:           Or from a clone:
library(GateLabR)              # source("path/to/GateLabR/launch.R")

# Option A: launch and pass an existing SCE
launchGatingApp(my_sce)

# Option B: launch with no SCE — the app scans the global environment
#           and lets you pick from any SingleCellExperiment objects present
launchGatingApp()

The app opens in your default browser. The three-column layout is:

Panel	Content
Left	Sample filter, scale controls, FCS / GatingML / workspace import-export, UMAP
Centre	Interactive plot (tabs: Gating | Strategy | Illustration | Statistics | Panel)
Right	Gates list, population tree, bulk-rename controls

Typical workflow

1. Get your events into the app, either way:
   • Import .fcs files directly in the app — it builds the SCE and auto-detects flow vs CyTOF (and the per-channel transforms).
   • Or load an existing SingleCellExperiment — e.g. from CATALYST prepData() (CyTOF) or one you've built from flowCore / your own pipeline.
2. launchGatingApp() (then pick a loaded SCE or Import FCS), or launchGatingApp(sce) to start from an object already in your session.
3. Draw gates on the central plot; the gate list and population tree update live.
4. Build populations by referencing gates with AND / OR logic.
5. Export results for downstream work — populations as new colData columns on the SCE (Export Population, e.g. for diffcyt, CATALYST, or any SCE-aware analysis), or gated events back out as .fcs.
6. Save the SCE (e.g. saveRDS(sce, "gated.rds")) — the workspace is embedded in metadata() and reloaded next time.

Data persistence

GateLabR stores its state inside the SCE itself:

metadata(sce)$gating_workspace
#> $gates             — list of gate objects
#> $populations       — list of population objects (hierarchy)
#> $gate_order        — display order
#> $root_population_id
#> $global_scale_ranges, $cytof_axis_range, $illust_settings, ...

You can also export a portable workspace as a standalone .rds (Save Workspace button) and load it into a different SCE — channels are matched by name, missing ones are skipped with a warning.

File formats supported

• Input: FCS 3.0 / 3.1, Cytobank Gating-ML 2.0 XML, workspace .rds.
• Output: FCS, Gating-ML 2.0 (Cytobank-compatible or standard re-importable), workspace .rds, SCE .rds (with embedded workspace), per-population colData columns, CSV statistics, SVG / PDF figures.

Citation

If you use GateLabR in published work, please cite the Zenodo archive:

Priest, D. G. (2026). GateLabR: Interactive manual gating for SingleCellExperiment objects. Version 1.0.0. Zenodo. https://doi.org/10.5281/zenodo.20404387

BibTeX:

@software{priest_gatelabr_2026,
  author    = {Priest, David G.},
  title     = {GateLabR: Interactive manual gating for SingleCellExperiment objects},
  year      = {2026},
  version   = {1.0.0},
  doi       = {10.5281/zenodo.20404387},
  url       = {https://github.com/david-priest/GateLabR},
  publisher = {Zenodo}
}

GitHub's "Cite this repository" button (powered by CITATION.cff) renders formatted citations in several styles.

License

MIT — see LICENSE.

Acknowledgements

GateLabR is developed in the Wing Lab at the Immunology Frontier Research Center (IFReC), Osaka University.

Built on top of the Bioconductor stack (SingleCellExperiment, SummarizedExperiment, flowCore), the Shiny web framework, and D3.js for the interactive plot.

Issues and contributions

If you run into a bug, or there's a feature you'd find useful, please open an issue or get in touch — I'm happy to take a look and would be glad to implement it.

A note on .fcs import: import has been thoroughly tested on files from a BD spectral flow cytometer, but not yet on files from other vendors (Beckman Coulter, Cytek, Sony, Thermo, Miltenyi, …). Channel and instrument detection is designed to be vendor-agnostic, but if a file imports incorrectly — missing markers, wrong channels, or a mis-detected flow/CyTOF mode — please let me know (ideally with the file's channel names) and I'll get it sorted.

A note on compensation: embedded-$SPILLOVER compensation has been validated on conventional fluorescence data from a BD FACSAria III / FACSymphony S6, with compensated values matching flowCore::compensate. It has not yet been exercised on embedded matrices from other vendors' acquisition software; the matrix is read vendor-agnostically (flowCore::spillover), so if compensation looks wrong for a given file please send me its channel names and spillover keyword and I'll take a look.