Last updated: 2021-04-07

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Knit directory: neural_scRNAseq/

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These are the previous versions of the repository in which changes were made to the R Markdown (analysis/timepoints-01-organoid-integration.Rmd) and HTML (docs/timepoints-01-organoid-integration.html) files. If you've configured a remote Git repository (see ?wflow_git_remote), click on the hyperlinks in the table below to view the files as they were in that past version.

File Version Author Date Message
Rmd 34d584d khembach 2021-04-07 include cell type and line comp in UMAP
html 313dba7 khembach 2020-10-30 Build site.
Rmd fabdbda khembach 2020-10-29 integrate all time points with the organoid data

Load packages

library(BiocParallel)
library(ggplot2)
library(dplyr)
library(cowplot)
library(ggplot2)
library(Seurat)
library(SingleCellExperiment)
library(future)
# increase future's maximum allowed size of exported globals
# the default is 2GB
options(future.globals.maxSize = 11000 * 1024 ^ 2)
# change the current plan to access parallelization
plan("multiprocess", workers = 20)

Load data

## our 8 samples
so_nc <- readRDS(file.path("output", "so_06-clustering_all_timepoints.rds"))
DefaultAssay(so_nc) <- "RNA"
so_org <- readRDS(file.path("output", "so_organoid-01-clustering.rds"))
DefaultAssay(so_org) <- "RNA"

Integration

We integrate the two datasets using our neural cultures and the two cell lines from Kanton et al.

## make sure column names match between datasets:
## we will use sample_id, group_id, nUMI, fractionMt, nGene
so_nc$Stage <- so_nc$group_id
so_nc$nUMI <- so_nc$sum
so_nc$fractionMt <- so_nc$subsets_Mt_fraction
so_nc$nGene <- so_nc$detected
so_nc$sum <- NULL
so_nc$subsets_Mt_fraction <- NULL
so_nc$detected <- NULL
so_org$sample_id <- so_org$Sample
so_org$group_id <- so_org$Line
so_org$fractionMt <- so_org$PercentMito
so_org$Line <- NULL
so_org$PercentMito <- NULL

so_nc$integration_group <- "NC"
so_org$integration_group <- so_org$group_id

# split organoid cells by integration group
cells_by_sample <- split(colnames(so_org), so_org$integration_group)
so_org <- lapply(cells_by_sample, function(i) subset(so_org, cells = i))
## we combine the two lists
so <- c(so_nc, so_org)

## Identify the top 2000 genes with high cell-to-cell variation
so <- lapply(so, FindVariableFeatures, nfeatures = 2000, 
    selection.method = "vst", verbose = FALSE)
## find anchors & integrate
as <- FindIntegrationAnchors(so, verbose = FALSE)
so <- IntegrateData(anchorset = as, dims = seq_len(30), verbose = FALSE)
DefaultAssay(so) <- "integrated"
## We scale the data
so <- ScaleData(so, verbose = FALSE,
                vars.to.regress = c("nUMI", "fractionMt"))
so <- RunPCA(so, npcs = 30, verbose = FALSE)
so <- RunTSNE(so, reduction = "pca", dims = seq_len(20),
    seed.use = 1, do.fast = TRUE, verbose = FALSE)
so <- RunUMAP(so, reduction = "pca", dims = seq_len(20),
    seed.use = 1, verbose = FALSE)

## PCA plot 
DimPlot(so, reduction = "pca", group.by = "sample_id")

Version Author Date
313dba7 khembach 2020-10-30
# elbow plot with the ranking of PCs based on the % of variance explained
ElbowPlot(so, ndims = 30)

Version Author Date
313dba7 khembach 2020-10-30
so <- FindNeighbors(so, reduction = "pca", dims = seq_len(20), verbose = FALSE)
so <- FindClusters(so, resolution = 0.4, random.seed = 1, verbose = FALSE)
## we use factors for plotting
so$group_id <- factor(so$group_id, 
                       levels = c("P22", "D52", "D96", "D223", "H9", "409b2"))
## order levels according to experiment timeline (Fig. 1a)
so$Stage <- factor(so$Stage, levels = c("P22", "D52", "D96", "D223", "iPSCs", "EB", 
                                          "Neuroectoderm", "Neuroepithelium",
                                          "Organoid-1M", "Organoid-2M", 
                                          "Organoid-4M"))

## merge the lineage labels of identical cell types
so$cl_FullLineage <- as.factor(so$cl_FullLineage)
levels(so$cl_FullLineage) <- c("choroid plexus/mesenchymal-like cells",  
                 "cortical neurons",  "cortical neurons", 
                 "cycling dorsal progenitors", "cycling ventral progenitors", 
                 "ectodermal/neuroectodermal-like cells", 
                 "gliogenic/outer RGCs and astrocytes",
                 "IPs and early cortical neurons", "midbrain/hindbrain cells", 
                 "neuroepithelial-like cells", "retina progenitors", "RGCs", 
                 "RGCs early", "RGCs early", "stem cells", "stem cells", 
                 "stem cells", "ventral progenitors and neurons", 
                 "ventral progenitors and neurons", 
                 "ventral progenitors and neurons")

Dimension reduction plots

We plot the dimension reduction (DR) and color by the groups used for integration, sample/cell line, group/Stage, organoid cluster labels, cluster ID.

# set cluster IDs to resolution 0.4 clustering
so <- SetIdent(so, value = "integrated_snn_res.0.4")
so@meta.data$cluster_id <- Idents(so)

cs <- sample(colnames(so), 10e3)
.plot_dr <- function(so, dr, id)
    DimPlot(so, cells = cs, group.by = id, reduction = dr, pt.size = 0.4) +
        guides(col = guide_legend(nrow = 11, 
            override.aes = list(size = 3, alpha = 1))) +
        theme_void() + theme(aspect.ratio = 1)
ids <- c("integration_group", "sample_id", "group_id", "Stage", 
         "cl_FullLineage", "cl_LineComp", "PredCellType", "ident")
for (id in ids) {
    cat("### ", id, "\n")
    p1 <- .plot_dr(so, "tsne", id)
    lgd <- get_legend(p1)
    p1 <- p1 + theme(legend.position = "none")
    p2 <- .plot_dr(so, "umap", id) + theme(legend.position = "none")
    ps <- plot_grid(plotlist = list(p1, p2), nrow = 1)
    p <- plot_grid(ps, lgd, nrow = 1, rel_widths = c(1, 0.5))
    print(p)
    cat("\n\n")
}

integration_group

Version Author Date
313dba7 khembach 2020-10-30

sample_id

Version Author Date
313dba7 khembach 2020-10-30

group_id

Version Author Date
313dba7 khembach 2020-10-30

Stage

Version Author Date
313dba7 khembach 2020-10-30

cl_FullLineage

Version Author Date
313dba7 khembach 2020-10-30

cl_LineComp

PredCellType

ident

QC on DR plots

.plot_features <- function(so, dr, id) {
    FeaturePlot(so, cells = cs, features = id, reduction = dr, pt.size = 0.4, 
                cols = c("grey", "blue")) +
        guides(col = guide_legend(nrow = 11, 
            override.aes = list(size = 3, alpha = 1))) +
        theme_void() + theme(aspect.ratio = 1)
}
ids <- c("nUMI", "nGene", "fractionMt")
for (id in ids) {
    cat("### ", id, "\n")
    p1 <- .plot_features(so, "tsne", id)
    lgd <- get_legend(p1)
    p1 <- p1 + theme(legend.position = "none") + ggtitle("tSNE")
    p2 <- .plot_features(so, "umap", id) + theme(legend.position = "none") + 
      ggtitle("UMAP")
    ps <- plot_grid(plotlist = list(p1, p2), nrow = 1)
    p <- plot_grid(ps, lgd, nrow = 1, rel_widths = c(1, 0.2))
    print(p)
    cat("\n\n")
}

nUMI

Version Author Date
313dba7 khembach 2020-10-30

nGene

Version Author Date
313dba7 khembach 2020-10-30

fractionMt

Version Author Date
313dba7 khembach 2020-10-30

Save Seurat object to RDS

saveRDS(so, file.path("output", "so_timepoints-01-organoid_integration.rds"))

sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.5 LTS

Matrix products: default
BLAS:   /usr/local/R/R-4.0.0/lib/libRblas.so
LAPACK: /usr/local/R/R-4.0.0/lib/libRlapack.so

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [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] parallel  stats4    stats     graphics  grDevices utils     datasets 
[8] methods   base     

other attached packages:
 [1] future_1.17.0               SingleCellExperiment_1.10.1
 [3] SummarizedExperiment_1.18.1 DelayedArray_0.14.0        
 [5] matrixStats_0.56.0          Biobase_2.48.0             
 [7] GenomicRanges_1.40.0        GenomeInfoDb_1.24.2        
 [9] IRanges_2.22.2              S4Vectors_0.26.1           
[11] BiocGenerics_0.34.0         Seurat_3.1.5               
[13] cowplot_1.0.0               dplyr_1.0.2                
[15] ggplot2_3.3.2               BiocParallel_1.22.0        
[17] workflowr_1.6.2            

loaded via a namespace (and not attached):
 [1] nlme_3.1-148           tsne_0.1-3             bitops_1.0-6          
 [4] fs_1.4.2               RcppAnnoy_0.0.16       RColorBrewer_1.1-2    
 [7] httr_1.4.1             rprojroot_1.3-2        sctransform_0.2.1     
[10] tools_4.0.0            backports_1.1.9        R6_2.4.1              
[13] irlba_2.3.3            KernSmooth_2.23-17     uwot_0.1.8            
[16] lazyeval_0.2.2         colorspace_1.4-1       withr_2.2.0           
[19] tidyselect_1.1.0       gridExtra_2.3          compiler_4.0.0        
[22] git2r_0.27.1           plotly_4.9.2.1         labeling_0.3          
[25] scales_1.1.1           lmtest_0.9-37          ggridges_0.5.2        
[28] pbapply_1.4-2          rappdirs_0.3.1         stringr_1.4.0         
[31] digest_0.6.25          rmarkdown_2.3          XVector_0.28.0        
[34] pkgconfig_2.0.3        htmltools_0.5.0        htmlwidgets_1.5.1     
[37] rlang_0.4.7            farver_2.0.3           generics_0.0.2        
[40] zoo_1.8-8              jsonlite_1.7.0         ica_1.0-2             
[43] RCurl_1.98-1.3         magrittr_1.5           GenomeInfoDbData_1.2.3
[46] patchwork_1.0.1        Matrix_1.2-18          Rcpp_1.0.5            
[49] munsell_0.5.0          ape_5.4                reticulate_1.16       
[52] lifecycle_0.2.0        stringi_1.4.6          whisker_0.4           
[55] yaml_2.2.1             zlibbioc_1.34.0        MASS_7.3-51.6         
[58] Rtsne_0.15             plyr_1.8.6             grid_4.0.0            
[61] listenv_0.8.0          promises_1.1.1         ggrepel_0.8.2         
[64] crayon_1.3.4           lattice_0.20-41        splines_4.0.0         
[67] knitr_1.29             pillar_1.4.6           igraph_1.2.5          
[70] future.apply_1.6.0     reshape2_1.4.4         codetools_0.2-16      
[73] leiden_0.3.3           glue_1.4.2             evaluate_0.14         
[76] data.table_1.12.8      vctrs_0.3.4            png_0.1-7             
[79] httpuv_1.5.4           gtable_0.3.0           RANN_2.6.1            
[82] purrr_0.3.4            tidyr_1.1.0            xfun_0.15             
[85] rsvd_1.0.3             RSpectra_0.16-0        later_1.1.0.1         
[88] survival_3.2-3         viridisLite_0.3.0      tibble_3.0.3          
[91] cluster_2.1.0          globals_0.12.5         fitdistrplus_1.1-1    
[94] ellipsis_0.3.1         ROCR_1.0-11