CITE-seq data with MultiAssayExperiment and MuData
2022-04-26
0.1 Introduction
CITE-seq data provide RNA and surface protein counts for the same cells. This tutorial shows how MuData can be integrated into with Bioconductor workflows to analyse CITE-seq data.
0.2 Installation
The most recent dev build can be installed from GitHub:
library(remotes)
remotes::install_github("ilia-kats/MuData")Stable version of MuData will be available in future bioconductor versions.
0.3 Loading libraries
library(MuData)
library(SingleCellExperiment)
library(MultiAssayExperiment)
library(SingleCellMultiModal)
library(scater)
library(rhdf5)0.4 Loading data
We will use CITE-seq data accessible with the
SingleCellMultiModal Bioconductor package,
which was originally described in
Stoeckius et al., 2017.
mae <- CITEseq(
DataType="cord_blood", modes="*", dry.run=FALSE, version="1.0.0"
)
#> Dataset: cord_blood
#> snapshotDate(): 2022-04-19
#> Working on: scADT_Counts
#> Working on: scRNAseq_Counts
#> see ?SingleCellMultiModal and browseVignettes('SingleCellMultiModal') for documentation
#> loading from cache
#> see ?SingleCellMultiModal and browseVignettes('SingleCellMultiModal') for documentation
#> loading from cache
mae
#> A MultiAssayExperiment object of 2 listed
#> experiments with user-defined names and respective classes.
#> Containing an ExperimentList class object of length 2:
#> [1] scADT: matrix with 13 rows and 8617 columns
#> [2] scRNAseq: matrix with 36280 rows and 8617 columns
#> Functionality:
#> experiments() - obtain the ExperimentList instance
#> colData() - the primary/phenotype DataFrame
#> sampleMap() - the sample coordination DataFrame
#> `$`, `[`, `[[` - extract colData columns, subset, or experiment
#> *Format() - convert into a long or wide DataFrame
#> assays() - convert ExperimentList to a SimpleList of matrices
#> exportClass() - save data to flat filesWe see two modalities in the object — scRNAseq and scADT, the latter
providing counts for antibody-derived tags. Notably, each experiment is a matrix.
0.5 Processing ADT data
While CITE-seq analysis workflows such as CiteFuse should be consulted for more details, below we exemplify simple data transformation in order to demonstrate how their output can be saved to an H5MU file later on.
For ADT counts, we will apply CLR transformation following Hao et al., 2020:
# Define CLR transformation as in the Seurat workflow
clr <- function(data) t(
apply(data, 1, function(x) log1p(
x / (exp(sum(log1p(x[x > 0]), na.rm = TRUE) / length(x)))
))
)We will make the ADT modality a SingleCellExperiment object and add an assay
with CLR-transformed counts:
adt_counts <- mae[["scADT"]]
mae[["scADT"]] <- SingleCellExperiment(adt_counts)
assay(mae[["scADT"]], "clr") <- clr(adt_counts)We will also generate reduced dimensions taking advantage of the functionality
in the scater package:
mae[["scADT"]] <- runPCA(
mae[["scADT"]], exprs_values = "clr", ncomponents = 20
)
#> Warning in check_numbers(k = k, nu = nu, nv = nv, limit = min(dim(x)) - : more
#> singular values/vectors requested than available
#> Warning in (function (A, nv = 5, nu = nv, maxit = 1000, work = nv + 7, reorth =
#> TRUE, : You're computing too large a percentage of total singular values, use a
#> standard svd instead.plotReducedDim(mae[["scADT"]], dimred = "PCA",
by_exprs_values = "clr", colour_by = "CD3")
plotReducedDim(mae[["scADT"]], dimred = "PCA",
by_exprs_values = "clr", colour_by = "CD14")
0.6 Writing H5MU files
We can write the contents of the MultiAssayExperiment object into an H5MU file:
writeH5MU(mae, "cord_blood_citeseq.h5mu")We can check that both modalities were written to the file, whether it was a
matrix for RNA or SingleCellExperiment for ADT:
h5 <- rhdf5::H5Fopen("cord_blood_citeseq.h5mu")
h5ls(H5Gopen(h5, "mod"), recursive = FALSE)
#> group name otype dclass dim
#> 0 / scADT H5I_GROUP
#> 1 / scRNAseq H5I_GROUP… both assays for ADT — raw counts are stored in X and CLR-transformed
counts are in the corresponding layer:
h5ls(H5Gopen(h5, "mod/scADT"), recursive = FALSE)
#> group name otype dclass dim
#> 0 / X H5I_DATASET INTEGER 13 x 8617
#> 1 / layers H5I_GROUP
#> 2 / obs H5I_GROUP
#> 3 / obsm H5I_GROUP
#> 4 / var H5I_GROUP
h5ls(H5Gopen(h5, "mod/scADT/layers"), recursive = FALSE)
#> group name otype dclass dim
#> 0 / clr H5I_DATASET FLOAT 13 x 8617… as well as reduced dimensions (PCA):
h5ls(H5Gopen(h5, "mod/scADT/obsm"), recursive = FALSE)
#> group name otype dclass dim
#> 0 / PCA H5I_DATASET FLOAT 12 x 8617
# There is an alternative way to access groups:
# h5&'mod'&'scADT'&'obsm'
rhdf5::H5close()0.7 References
mudata (Python) documentation
muon documentation and web page
Stoeckius, M., Hafemeister, C., Stephenson, W., Houck-Loomis, B., Chattopadhyay, P.K., Swerdlow, H., Satija, R. and Smibert, P., 2017. Simultaneous epitope and transcriptome measurement in single cells. Nature methods, 14(9), pp.865-868.
Hao, Y., Hao, S., Andersen-Nissen, E., Mauck III, W.M., Zheng, S., Butler, A., Lee, M.J., Wilk, A.J., Darby, C., Zager, M. and Hoffman, P., 2021. Integrated analysis of multimodal single-cell data. Cell.
0.8 Session Info
sessionInfo()
#> R version 4.2.0 RC (2022-04-19 r82224)
#> Platform: x86_64-pc-linux-gnu (64-bit)
#> Running under: Ubuntu 20.04.4 LTS
#>
#> Matrix products: default
#> BLAS: /home/biocbuild/bbs-3.15-bioc/R/lib/libRblas.so
#> LAPACK: /home/biocbuild/bbs-3.15-bioc/R/lib/libRlapack.so
#>
#> locale:
#> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
#> [3] LC_TIME=en_GB LC_COLLATE=C
#> [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
#> [7] LC_PAPER=en_US.UTF-8 LC_NAME=C
#> [9] LC_ADDRESS=C LC_TELEPHONE=C
#> [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
#>
#> attached base packages:
#> [1] stats4 stats graphics grDevices utils datasets methods
#> [8] base
#>
#> other attached packages:
#> [1] SingleCellMultiModal_1.7.1 scater_1.24.0
#> [3] ggplot2_3.3.5 scuttle_1.6.0
#> [5] CiteFuse_1.8.0 MultiAssayExperiment_1.22.0
#> [7] SingleCellExperiment_1.18.0 SummarizedExperiment_1.26.0
#> [9] Biobase_2.56.0 GenomicRanges_1.48.0
#> [11] GenomeInfoDb_1.32.0 IRanges_2.30.0
#> [13] MatrixGenerics_1.8.0 matrixStats_0.62.0
#> [15] MuData_1.0.0 rhdf5_2.40.0
#> [17] S4Vectors_0.34.0 BiocGenerics_0.42.0
#> [19] Matrix_1.4-1 BiocStyle_2.24.0
#>
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