tidyFlowCore
29 October 2024
Package
tidyFlowCore 1.0.0
1 Basics
1.1 Installing tidyFlowCore
R is an open-source statistical environment which can be easily modified to enhance its functionality via packages. tidyFlowCore is an R package available via Bioconductor, an open-source repository for R packages related to biostatistics and biocomputing.
R can be installed on any operating system from CRAN, after which you can install tidyFlowCore by using the following commands in your R session:
if (!requireNamespace("BiocManager", quietly = TRUE)) {
install.packages("BiocManager")
}
BiocManager::install("tidyFlowCore")
## Check that you have a valid Bioconductor installation
BiocManager::valid()1.2 Preliminaries
tidyFlowCore adopts the so-called “tidy” functional programming paradigm developed by Wickham et al. in the tidyverse ecosystem of R packages (Wickham, François, Henry, Müller, and Vaughan, 2023). For information about the tidyverse ecosytem broadly, feel free to reference the (free) R for Data Science book, the tidyverse website, or this paper describing the larger tidyomics project.
tidyFlowCore integrates the flowCore Bioconductor package’s data analysis capabilities with those of the tidyverse. If you’re relatively unfamiliar with the Bioconductor project, you might be interested in this blog post.
1.3 Asking for help
Learning to use R and Bioconductor can be challenging, so it’s important to know where to get help. The main place to ask questions about tidyFlowCore is the Bioconductor support site. Use the tidyFlowCore tag there and look at previous posts.
You can also ask questions on GitHub or Twitter. But remember, if you’re asking for help, follow the posting guidelines. Make sure to include a simple example that reproduces your issue (a “reprex”) and your session info to help developers understand and solve your problem.
1.4 Citing tidyFlowCore
If you use tidyFlowCore for your research, please use the following citation.
citation("tidyFlowCore")
#> Warning in person1(given = given[[i]], family = family[[i]], middle =
#> middle[[i]], : It is recommended to use 'given' instead of 'middle'.
#> To cite package 'tidyFlowCore' in publications use:
#>
#> Keyes TJ (2024). _tidyFlowCore: Bringing flowCore to the tidyverse_.
#> doi:10.18129/B9.bioc.tidyFlowCore
#> <https://doi.org/10.18129/B9.bioc.tidyFlowCore>,
#> https://github.com/keyes-timothy/tidyflowCore/tidyFlowCore - R
#> package version 1.0.0,
#> <http://www.bioconductor.org/packages/tidyFlowCore>.
#>
#> A BibTeX entry for LaTeX users is
#>
#> @Manual{,
#> title = {tidyFlowCore: Bringing flowCore to the tidyverse},
#> author = {Timothy J Keyes},
#> year = {2024},
#> url = {http://www.bioconductor.org/packages/tidyFlowCore},
#> note = {https://github.com/keyes-timothy/tidyflowCore/tidyFlowCore - R package version 1.0.0},
#> doi = {10.18129/B9.bioc.tidyFlowCore},
#> }2 tidyFlowCore quick start
tidyFlowCore allows you to treat flowCore data structures like tidy data.frames or tibbles. It does so by implementing dplyr, tidyr, and ggplot2 verbs that can be deployed directly on the flowFrame and flowSet S4 classes.
In this section, we give a brief example of how tidyFlowCore can enable a data analysis pipeline to use all the useful functions of the flowCore package and many of the functions of the dplyr, tidyr, and ggplot2 packages.
2.1 Load required packages
library(tidyFlowCore)
library(flowCore)2.2 Read data
For our example here, we download some publicly available mass cytometry (CyTOF) data downloadable through the (Weber, M, Soneson, and Charlotte, 2019) package. These data are made available as a flowCore::flowSet S4 object, Bioconductor’s standard data structure for cytometry data.
# read data from the HDCytoData package
bcr_flowset <- HDCytoData::Bodenmiller_BCR_XL_flowSet()
#> see ?HDCytoData and browseVignettes('HDCytoData') for documentation
#> loading from cache
#> Warning in updateObjectFromSlots(object, ..., verbose = verbose): dropping
#> slot(s) 'colnames' from object = 'flowSet'To read more about this dataset, run the following command:
?HDCytoData::Bodenmiller_BCR_XL_flowSet2.3 Data transformation
The flowCore package natively supports multiple types of data preprocessing and transformations for cytometry data through the use of its tranform class.
For example, if we want to apply the standard arcsinh transformation often used for CyTOF data to our current dataset, we could use the following code:
asinh_transformation <- flowCore::arcsinhTransform(a = 0, b = 1/5, c = 0)
transformation_list <-
flowCore::transformList(
colnames(bcr_flowset),
asinh_transformation
)
transformed_bcr_flowset <- flowCore::transform(bcr_flowset, transformation_list)Alternatively, we can also use the tidyverse’s functional programming paradigm to perform the same transformation. For this, we use the mutate-across framework via tidyFlowCore:
transformed_bcr_flowset <-
bcr_flowset |>
dplyr::mutate(across(-ends_with("_id"), \(.x) asinh(.x / 5)))2.4 Cell type counting
Suppose we’re interested in counting the number of cells that belong to each cell type (encoded in the population_id column of bcr_flowset) in our dataset. Using standard flowCore functions, we could perform this calculation in a few steps:
# extract all expression matrices from our flowSet
combined_matrix <- flowCore::fsApply(bcr_flowset, exprs)
# take out the concatenated population_id column
combined_population_id <- combined_matrix[, 'population_id']
# perform the calculation
table(combined_population_id)
#> combined_population_id
#> 1 2 3 4 5 6 7 8
#> 3265 6651 62890 51150 1980 18436 24518 3901tidyFlowCore allows us to perform the same operation simply using the dplyr package’s count function, with output provided in the convenient form of a tibble:
bcr_flowset |>
dplyr::count(population_id)
#> # A tibble: 8 × 2
#> population_id n
#> <dbl> <int>
#> 1 1 3265
#> 2 2 6651
#> 3 3 62890
#> 4 4 51150
#> 5 5 1980
#> 6 6 18436
#> 7 7 24518
#> 8 8 3901tidyFlowCore also makes it easy to perform the counting after grouping by other variables in our metadata. For example, we can see that bcr_flowset contains data from multiple .FCS files, each of which is associated with a file name.
flowCore::pData(object = bcr_flowset)
#> name
#> PBMC8_30min_patient1_BCR-XL.fcs PBMC8_30min_patient1_BCR-XL.fcs
#> PBMC8_30min_patient1_Reference.fcs PBMC8_30min_patient1_Reference.fcs
#> PBMC8_30min_patient2_BCR-XL.fcs PBMC8_30min_patient2_BCR-XL.fcs
#> PBMC8_30min_patient2_Reference.fcs PBMC8_30min_patient2_Reference.fcs
#> PBMC8_30min_patient3_BCR-XL.fcs PBMC8_30min_patient3_BCR-XL.fcs
#> PBMC8_30min_patient3_Reference.fcs PBMC8_30min_patient3_Reference.fcs
#> PBMC8_30min_patient4_BCR-XL.fcs PBMC8_30min_patient4_BCR-XL.fcs
#> PBMC8_30min_patient4_Reference.fcs PBMC8_30min_patient4_Reference.fcs
#> PBMC8_30min_patient5_BCR-XL.fcs PBMC8_30min_patient5_BCR-XL.fcs
#> PBMC8_30min_patient5_Reference.fcs PBMC8_30min_patient5_Reference.fcs
#> PBMC8_30min_patient6_BCR-XL.fcs PBMC8_30min_patient6_BCR-XL.fcs
#> PBMC8_30min_patient6_Reference.fcs PBMC8_30min_patient6_Reference.fcs
#> PBMC8_30min_patient7_BCR-XL.fcs PBMC8_30min_patient7_BCR-XL.fcs
#> PBMC8_30min_patient7_Reference.fcs PBMC8_30min_patient7_Reference.fcs
#> PBMC8_30min_patient8_BCR-XL.fcs PBMC8_30min_patient8_BCR-XL.fcs
#> PBMC8_30min_patient8_Reference.fcs PBMC8_30min_patient8_Reference.fcstidyFlowCore makes it easy to perform grouped tidy operations, like counting, using information in our flowSet’s metadata:
bcr_flowset |>
# use the .tidyFlowCore_identifier pronoun to access the name of
# each experiment in the flowSet
dplyr::count(.tidyFlowCore_identifier, population_id)
#> # A tibble: 128 × 3
#> .tidyFlowCore_identifier population_id n
#> <chr> <dbl> <int>
#> 1 PBMC8_30min_patient1_BCR-XL.fcs 1 31
#> 2 PBMC8_30min_patient1_BCR-XL.fcs 2 112
#> 3 PBMC8_30min_patient1_BCR-XL.fcs 3 761
#> 4 PBMC8_30min_patient1_BCR-XL.fcs 4 1307
#> 5 PBMC8_30min_patient1_BCR-XL.fcs 5 5
#> 6 PBMC8_30min_patient1_BCR-XL.fcs 6 127
#> 7 PBMC8_30min_patient1_BCR-XL.fcs 7 444
#> 8 PBMC8_30min_patient1_BCR-XL.fcs 8 51
#> 9 PBMC8_30min_patient1_Reference.fcs 1 52
#> 10 PBMC8_30min_patient1_Reference.fcs 2 132
#> # ℹ 118 more rows2.5 Nesting and unnesting
flowFrame and flowSet data objects have a clear relationship with one another in the flowCore application programming interface (API). Essentially, flowSets are nested flowFrames - or, in other words, flowSets are made up of multiple flowFrames!
tidyFlowCore provides a useful API for converting between flowSet and flowFrame data structures at various degrees of nesting using the group/nest and ungroup/unnest verbs. Note that in the dplyr and tidyr APIs, group/nest and ungroup/unnest are not synonyms (grouped data.frames are different from nested data.frames). However, because of how flowFrames and flowSets are structured, tidyFlowCore’s group/nest and ungroup/unnest functions have identical behavior, respectively.
# unnesting a flowSet results in a flowFrame with an additional column,
# 'tidyFlowCore_name` that identifies cells based on which experiment in the
# original flowSet they come from
bcr_flowset |>
dplyr::ungroup()
#> flowFrame object 'filefa4693e0b6415'
#> with 172791 cells and 40 observables:
#> name desc range minRange maxRange
#> $P1 Time Time 2399633 0.0000 2399632
#> $P2 Cell_length Cell_length 69 0.0000 68
#> $P3 CD3(110:114)Dd CD3(110:114)Dd 9383 -61.6796 9382
#> $P4 CD45(In115)Dd CD45(In115)Dd 5035 0.0000 5034
#> $P5 BC1(La139)Dd BC1(La139)Dd 14306 -100.8797 14305
#> ... ... ... ... ... ...
#> $P36 group_id group_id 3 0 2
#> $P37 patient_id patient_id 9 0 8
#> $P38 sample_id sample_id 17 0 16
#> $P39 population_id population_id 9 0 8
#> $P40 .tidyFlowCore_name .tidyFlowCore_name 17 0 16
#> 297 keywords are stored in the 'description' slot# flowSets can be unnested and re-nested for various analyses
bcr_flowset |>
dplyr::ungroup() |>
# group_by cell type
dplyr::group_by(population_id) |>
# calculate the mean HLA-DR expression of each cell population
dplyr::summarize(mean_hladr_expression = mean(`HLA-DR(Yb174)Dd`)) |>
dplyr::select(population_id, mean_hladr_expression)
#> # A tibble: 8 × 2
#> population_id mean_hladr_expression
#> <dbl> <dbl>
#> 1 3 3.67
#> 2 7 3.33
#> 3 4 4.33
#> 4 2 87.1
#> 5 6 88.2
#> 6 8 3.12
#> 7 1 51.4
#> 8 5 18.02.6 Plotting
tidyFlowCore also provides a direct interface between ggplot2 and flowFrame or flowSet data objects. For example…
# cell population names, from the HDCytoData documentation
population_names <-
c(
"B-cells IgM-",
"B-cells IgM+",
"CD4 T-cells",
"CD8 T-cells",
"DC",
"monocytes",
"NK cells",
"surface-"
)
# calculate mean CD20 expression across all cells
mean_cd20_expression <-
bcr_flowset |>
dplyr::ungroup() |>
dplyr::summarize(mean_expression = mean(asinh(`CD20(Sm147)Dd` / 5))) |>
dplyr::pull(mean_expression)
# calculate mean CD4 expression across all cells
mean_cd4_expression <-
bcr_flowset |>
dplyr::ungroup() |>
dplyr::summarize(mean_expression = mean(asinh(`CD4(Nd145)Dd` / 5))) |>
dplyr::pull(mean_expression)
bcr_flowset |>
# preprocess all columns that represent protein measurements
dplyr::mutate(dplyr::across(-ends_with("_id"), \(.x) asinh(.x / 5))) |>
# plot a CD4 vs. CD45 scatterplot
ggplot2::ggplot(ggplot2::aes(x = `CD20(Sm147)Dd`, y = `CD4(Nd145)Dd`)) +
# add some reference lines
ggplot2::geom_hline(
yintercept = mean_cd4_expression,
color = "red",
linetype = "dashed"
) +
ggplot2::geom_vline(
xintercept = mean_cd20_expression,
color = "red",
linetype = "dashed"
) +
ggplot2::geom_point(size = 0.1, alpha = 0.1) +
# facet by cell population
ggplot2::facet_wrap(
facets = ggplot2::vars(population_id),
labeller =
ggplot2::as_labeller(
\(population_id) population_names[as.numeric(population_id)]
)
) +
# axis labels
ggplot2::labs(
x = "CD20 expression (arcsinh)",
y = "CD4 expression (arcsinh)"
)
Using some standard functions from the ggplot2 library, we can create a scatterplot of CD4 vs. CD20 expression in the different cell populations included in the bcr_flowset flowSet. We can see, unsurprisingly, that both B-cell populations are highest for CD20 expression, whereas CD4+ T-helper cells are highest for CD4 expression.
3 Reproducibility
The tidyFlowCore package (Keyes, 2024) was made possible thanks to the following:
- R (R Core Team, 2024)
- BiocStyle (Oleś, 2024)
- knitr (Xie, 2024)
- RefManageR (McLean, 2017)
- rmarkdown (Allaire, Xie, Dervieux, McPherson, Luraschi, Ushey, Atkins, Wickham, Cheng, Chang, and Iannone, 2024)
- sessioninfo (Wickham, Chang, Flight, Müller, and Hester, 2021)
- testthat (Wickham, 2011)
- tidyverse (Wickham, François, Henry et al., 2023)
This package was developed using biocthis.
Code for creating the vignette
## Create the vignette
library("rmarkdown")
system.time(render("tidyFlowCore.Rmd", "BiocStyle::html_document"))
## Extract the R code
library("knitr")
knit("tidyFlowCore.Rmd", tangle = TRUE)Date the vignette was generated.
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This vignette was generated using BiocStyle (Oleś, 2024) with knitr (Xie, 2024) and rmarkdown (Allaire, Xie, Dervieux et al., 2024) running behind the scenes.
Citations made with RefManageR (McLean, 2017).
[1] J. Allaire, Y. Xie, C. Dervieux, et al. rmarkdown: Dynamic Documents for R. R package version 2.28. 2024. URL: https://github.com/rstudio/rmarkdown.
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