In christineyyeh/opipes: What the Package Does (One Line, Title Case)

knitr::opts_chunk$set(echo = TRUE)

Set-up: Loading/Installing Packages

First, let's get some practice installing and loading packages:

# from CRAN 
install.packages(c("ggplot2", "tibble", "devtools"))

# from Bioconductor 
if (!require("BiocManager", quietly = TRUE))
    install.packages("BiocManager")
BiocManager::install(version = "3.14")
BiocManager::install("EBImage")

# from Github 
devtools::install_github("https://github.com/livnatje/DIALOGUE")
devtools::install_github("https://github.com/Jerby-Lab/opipes")

To load packages, call library(YOURPACKAGENAME)

# from CRAN
library(ggplot2) 
library(tibble) 
library(pbapply)

# from Bioconductor
library(EBImage)

# from Github 
library(opipes) 
library(DIALOGUE)

Let's work with some real data:

For the purposes of this tutorial, we will load one sample from the ovarian cancer project: TMA-13, FOV-1

PATH <- "/Volumes/ljerby/HGSC_Profiling/Data/SMI/5 Raw data/SMI-0028_TMA_13/CellComposite/CellComposite_F001.jpg"
comp <- readImage(PATH)
display(comp, method = "raster")

Wait, what did you just do?

We just ran two functions from EBImage. A neat trick for helping you fetch the documentation on any function, is by putting a ? in front of the function name

?readImage

What's in an Image object in R?

comp

Reading in IF layers for processing

One of the things I'm working on whilst pre-processing the data, is to extract a quantitative measure of the IF intensity. These images are LARGE. Even loading them will take a bit.

From the documentation we obtained from Nanostring, we know that each of the frames in the raw images corresponds to a particular immunofluorescent stain.

PATH <- "/Volumes/ljerby/HGSC_Profiling/Data/SMI/5 Raw data/SMI-0028_TMA_13/RawMorphologyImages/20220222_094630_S2_C902_P99_N99_F001_Z005.TIF"
img <- readImage(PATH)
display(img, all = T)

Exploring some outputs of Cell-Segmentation

In order to extract IF intensities, you want to be able to assign each pixel to a cell. Lucky for me, Livnat has run cell-segmentation on our data. The DAPI (frame 5) and Membrane (CD298/B2M) was used to do the cell-segmentation.

# Reading and cleaning matrix names 
cellseg <- read.csv("/Volumes/ljerby/HGSC_Profiling/Results/Segmentation/SMI/Seg/SMI_T13_F001_whole-cell.csv")
colnames(cellseg) <- unlist(lapply(colnames(cellseg), function(x) {strsplit(x , split = "X0.")[[1]][2]}))
colnames(cellseg)[1] <- "0"
cellseg_raw <- cellseg
cellseg_raw[1000:1020, 1000:1009]

Plotting the cell segmentation map

# Plot the cell segmentation map
cellseg[cellseg == 1001] <- 0.9 # if a pixel is part of the cell, set the image intensity to 0.9
display(1- Image(t(as.matrix(cellseg))),  method = "raster")

Reading and plotting the nuclear-segmentation only map:

# Reading and cleaning matrix names 
nuclearseg <- read.csv("/Volumes/ljerby/HGSC_Profiling/Results/Segmentation/SMI/Seg/SMI_T13_F001_nuclear.csv")
colnames(nuclearseg) <- unlist(lapply(colnames(nuclearseg), function(x) {strsplit(x , split = "X0.")[[1]][2]}))
colnames(nuclearseg)[1] <- "0"
nuclearseg_raw <- nuclearseg

# Plot the nuclear cell segmentation map
nuclearseg[nuclearseg != 0] <- 0.9
display(1- Image(t(as.matrix(nuclearseg))),  method = "raster")

Match cell segmentation with IF intensities

PanCK, CD45 and CD3 immuno-flurescent intensity would be useful for cross-checking with computationally derived cell-type assignments downstream, so we will extract that now!

frameID <- data.frame(stain = c("Membrane", "PanCK", "CD45", "CD3", "DAPI"),
           frame_id = c(1:5))
tibble(frameID)

In the code block below, we loop over the 3 frames that contain PanCK, CD45 and CD3 intensity, and every cell, to extract the IF intensity of the cytoplasm. It is very slow (hours for one FOV), so we will not run it. Instead, I am running this in parallel on the cluster (topic for another time).

if_list <- lapply(2:4, function(fid){
  print(fid)
  intensities <- data.frame(t(pbsapply(c(1:max(cellseg_raw)), simplify = T, function(cid){
    if (sum(t(cellseg_raw) == cid & t(nuclearseg) == 0) == 0) { # this is the case where the cell segmentation is pretty much just the nucleus...
      return(c(NA, NA))
    } else { 
      mean <- mean(img@.Data[,,fid][t(cellseg_raw) == cid & t(nuclearseg) == 0])
      max <- max(img@.Data[,,fid][t(cellseg_raw) == cid & t(nuclearseg) == 0])
      return(c(max, mean)) 
    }
  })))
  colnames(intensities) <- paste0(frameID[fid,]$stain, c("_max", "_mean")) 
  return(intensities)
})
if_frame <- do.call("cbind", if_list)
row.names(if_frame) <- c(1:max(cellseg_raw))
saveRDS(if_frame, file = "/Volumes/ljerby/HGSC_Profiling/Intermediate/20220410_TMA13_FOV1_intensities.rds")

Computational cell-type assignments

There are some cell-types we obviously didn't stain for (e.g endothelial marker, fibroblast marker etc). We will use the RNA quantifications for each cell to assign cell-types.

First, we load the RNA data:

tma13 <- readRDS("/Volumes/ljerby/HGSC_Profiling/Data/R_data/SMI_HGSC_TMA13_mesmer.rds")
r <- tma13$SMI_T13_F001
remove(tma13)
names(r)

First, we process the data by filtering out cells with too few overall counts

tpm <- r$tpm[,unlist(apply(r$cd, 2, sum)) > 50]
coor <- r$coor[unlist(apply(r$cd, 2, sum)) > 50,]

Now we use the wrappers in opipes to cluster the data. By "wrappers" I mean I wrote code that "wraps" around other code. In this case, the other code is Seurat

set.seed(123)
so <- seuratify(tpm, prj = "tma13_fov1")
so <- std_preprocess(so, nfeatures = 350)
so <- run_pca(so, n_pcs = 20, pca.assay = "RNA")
so <- umap_tsne(so, umap.flag = T, n_dims = 20)
so <- opipes::cluster(so, n_dims = 20)

Let's plot our clustering:

plot_df <- data.frame(so@reductions$umap@cell.embeddings,
                      cluster = so$RNA_snn_res.0.4)
p <- ggplot(plot_df, aes(x = UMAP_1, y = UMAP_2, col = cluster)) + 
  geom_point(size = 0.5) +
  theme_bw() + 
  coord_fixed() + 
  guides(colour = guide_legend("cluster", 
                               override.aes = list(size=3, shape = 15)))
print(p)

Here, we call the cell type assignments, using a cell-type assignment code that I've wrapped into opipes

# create a list object 
q <- c()
q$tpm <- tpm 
q$genes <- row.names(tpm)
q$cells <- colnames(tpm)
q$clusters <- paste0("C", so$RNA_snn_res.0.4)

# read in your preferred cell type signatures
cell.sig <- readRDS("/Volumes/ljerby/SharedResources/Data/Signatures/cell.type.sig.rds")
cell.sig <- cell.sig$HGSC[-c(3,4,10)] # removing CD8.T, CD4.T, and cell cycle genes for now

# execute to cell-type assignment code
q <- scRNA_markers_assign(q,
                     cell.clusters = q$clusters,
                     cell.sig = cell.sig,
                     non.immune.cell.types = c('Endothelial','CAF','Malignant'),
                     immune.markers = c("CD3E","PTPRC","CD8A","CD4"))
install.packages("assertthat")

What do the cell-type assignments look like in in space?

plot_df <- data.frame(coor, 
                      so@reductions$umap@cell.embeddings,
                      cluster = q$clusters, 
                      cell_type = q$cell.types, 
                      so@reductions$pca@cell.embeddings)
tibble(plot_df)

And now we use this data.frame to plot our cell-type assignments in physical space

p <- ggplot(plot_df, aes(x = x, y = y, col = cell_type)) + 
  geom_point(size = 0.5) +
  scale_color_manual(values = c("#FF5B18", "#6580f0", "#c4a360", "#bc31cc", 
                                "#3ec25f", "#fce728", "#b5b5b5")) +
  theme(plot.title = element_text(hjust = 0.5, size = 16, face = "bold"), 
        panel.background = element_rect(fill = "black",
                                        colour = "black",
                                        size = 0.5, linetype = "solid"),
        panel.grid.major = element_line(size = 0.25, linetype = 'dotted'), 
        panel.grid.minor = element_line(size = 0.1, linetype = 'dotted')) +
    guides(colour = guide_legend("cluster", 
                               override.aes = list(size=3, shape = 15))) +
  coord_fixed()
print(p)

Isn't the comparison to the composite image uncanny?

display(comp, method = "raster")

Running DIALOGUE for Discovering Multicellular Programs

We will now run a tool developed by Livnat, for identifying "multi-cellular programs". Let's do an analysis to see if there are multi-cullular programs between malignant, fibroblasts, and macrophages

The first step is to make a DIALOGUE "cell type" object for each cell type of interest and store it in a list.

celltypes_of_interest <-c("Malignant", "Macrophage", "CAF")
cell.types <- c()
for (celltype in celltypes_of_interest) {
  cat(paste0("\nProcessing ", celltype, "...\n"))
  idx <- which(plot_df$cell_type == celltype)

  cat(paste0("\tSubsetting ", celltype, " Data...\n"))
  cell_tpm <- q$tpm[,idx]
  cell_meta <- so@meta.data[idx,]
  samples <- unlist(apply(coor[idx,], 1, function(row){
                             if(row[1] < 2000  & row [2] <2000) {
                               return("niche1") 
                              } else if (row[1] >= 2000 & row[2] < 2000) {
                                return("niche2")
                              } else  if (row[1] >= 2000 & row[2] >= 2000) {
                                return("niche3") 
                              } else {
                                return("niche4")
                              }}))
  cell_q <- r$comp.reads[cell_meta$cellid]

  cat(paste0("\tComputing PCA for ", celltype, " Data...\n"))
  sub <- seuratify(cell_tpm)
  sub <- std_preprocess(sub, nfeatures = 350)
  sub <- run_pca(sub, n_pcs = 20, pca.assay = "RNA", verbose = F)

  cat(paste0("\tCompute cell type object for ", celltype,  "...\n"))
  cell.types[[celltype]] <- DIALOGUE::make.cell.type(
    name = celltype, # the cell types
    tpm = cell_tpm, # tpm 
    samples = samples, #sample 
    X = sub@reductions$pca@cell.embeddings, # pcs 
    metadata = cell_meta, #metadata 
    cellQ = cell_q # cell quality
  )
}

Now we can run DIALOGUE!

library(DIALOGUE)
R<-DIALOGUE.run(rA =cell.types, 
                main = "20220412_Tutorial",
                k = 3, 
                results.dir = "~/Desktop/tutorial", 
                n.genes = 20)
                # conf = "cellQ",covar = c("cellQ"))