Last updated: 2023-08-24

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Introduction

Load data

We reprocessed the data from Calcagno et al, using the original cell-type annotations from the paper and will load this dataset as a seurat object.

## Load reprocessed Calcagno et al seurat object
#calcagno_et_al <- readRDS("./data/140623.calcagno_et_al.seurat_object.rds")
calcagno_et_al <- LoadH5Seurat("./data/Calcagno2022_int_logNorm_annot.h5Seurat")
Validating h5Seurat file
Initializing RNA with data
Adding counts for RNA
Adding miscellaneous information for RNA
Initializing integrated with data
Adding scale.data for integrated
Adding variable feature information for integrated
Adding miscellaneous information for integrated
Adding reduction pca
Adding cell embeddings for pca
Adding feature loadings for pca
Adding miscellaneous information for pca
Adding reduction umap
Adding cell embeddings for umap
Adding miscellaneous information for umap
Adding graph integrated_nn
Adding graph integrated_snn
Adding command information
Adding cell-level metadata
Adding miscellaneous information
Adding tool-specific results
Adding data that was not associated with an assay
Warning: Adding a command log without an assay associated with it
## Get only control cells for marker calculation
calcagno_et_al_d0 <- subset(calcagno_et_al,time == "D0")
calcagno_et_al_d1 <- subset(calcagno_et_al,time == "D1")

Let’s check the UMAP embedding from our reprocessed object.

## UMAP plot
DimPlot(calcagno_et_al,label = TRUE) + theme(legend.position = "none")

Version Author Date
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Next, let’s quickly verify, that Endocardial cells are expressing the proper markers before we compare them to our proteomic data.

plot_density(calcagno_et_al_d0, features = "Npr3")

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VlnPlot(calcagno_et_al_d0, features = "Npr3")

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Expression of the endocardial specific marker Npr3 in this dataset fits with the original authors annotation, suggesting that we can use these endocardial single-cell signature to identify endocardial specific genes in our proteomics data.

Analyze cell-type specific proteins in proteomic data

We will use the snRNAseq data to identify proteins likely differentially expressed in endocardial cells. For this, we will first identify genes specifically expressed in endocardial cells.

Check subclustering of endocard cells at d1

endocard_d1 <- subset(calcagno_et_al, level_2 == "Endocardial" & time == "D1")
endocard_d1 <- SCTransform(endocard_d1)
Running SCTransform on assay: RNA
vst.flavor='v2' set, setting model to use fixed slope and exclude poisson genes.
Calculating cell attributes from input UMI matrix: log_umi
Total Step 1 genes: 11133
Total overdispersed genes: 8857
Excluding 2276 genes from Step 1 because they are not overdispersed.
Variance stabilizing transformation of count matrix of size 11133 by 645
Model formula is y ~ log_umi
Get Negative Binomial regression parameters per gene
Using 2000 genes, 645 cells

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Setting estimate of  80 genes to inf as theta_mm/theta_mle < 1e-3
# of step1 poisson genes (variance < mean): 0
# of low mean genes (mean < 0.001): 0
Total # of Step1 poisson genes (theta=Inf; variance < mean): 80
Total # of poisson genes (theta=Inf; variance < mean): 2276
Calling offset model for all 2276 poisson genes
Found 85 outliers - those will be ignored in fitting/regularization step
Ignoring theta inf genes
Replacing fit params for 2276 poisson genes by theta=Inf
Setting min_variance based on median UMI:  0.04
Second step: Get residuals using fitted parameters for 11133 genes

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Computing corrected count matrix for 11133 genes

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Calculating gene attributes
Wall clock passed: Time difference of 2.467093 secs
Determine variable features
Centering data matrix
Place corrected count matrix in counts slot
Set default assay to SCT
endocard_d1 <- RunPCA(endocard_d1, verbose = FALSE)
endocard_d1 <- RunUMAP(endocard_d1, dims = 1:10, verbose = FALSE)
Warning: The default method for RunUMAP has changed from calling Python UMAP via reticulate to the R-native UWOT using the cosine metric
To use Python UMAP via reticulate, set umap.method to 'umap-learn' and metric to 'correlation'
This message will be shown once per session
Found more than one class "dist" in cache; using the first, from namespace 'spam'
Also defined by 'BiocGenerics'
Found more than one class "dist" in cache; using the first, from namespace 'spam'
Also defined by 'BiocGenerics'
endocard_d1 <- FindNeighbors(endocard_d1, dims = 1:10, verbose = FALSE)
endocard_d1 <- FindClusters(endocard_d1, verbose = FALSE, resolution = 0.2)
DimPlot(endocard_d1, label = TRUE) + NoLegend()

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endo_diff_marker <- FindAllMarkers(endocard_d1, only.pos = TRUE)
Calculating cluster 0
Calculating cluster 1
Calculating cluster 2
Calculating cluster 3
Calculating cluster 4
endo_diff_marker_top <- endo_diff_marker %>%
  subset(p_val_adj < 0.05)
VlnPlot(endocard_d1, features = c("Selp","Taco1","Serpine1","Prkg1","Nrg1"))

Version Author Date
ed31d81 FloWuenne 2023-07-02

Correlate pseudobulk snRNA-seq expression in endocardial cells with proteomic measurements

Let’s load the proteomic data now:

limma_res <- fread("./output/proteomics/proteomics.limma.full_statistics.tsv")

## Extract statistics for different contrasts
miiz_vs_control_signature <- subset(limma_res,analysis == "MI_IZ_vs_control")
miiz_vs_remote_signature <- subset(limma_res,analysis == "MI_IZ_vs_MI_remote")

## Load the normalized protein matrix as well
protein_mat <- fread(file = "./output/proteomics/proteomics.vsn_norm_proteins.tsv")
protein_mat_avg <- protein_mat %>%
  mutate(avg_control=rowMeans(.[ , c("control_r1","control_r2","control_r3")], na.rm=TRUE)) %>%
  mutate(avg_MI_IZ=rowMeans(.[ , c("MI_IZ_r1","MI_IZ_r2","MI_IZ_r3","MI_IZ_r4")], na.rm=TRUE)) %>%
  mutate(avg_MI_remote=rowMeans(.[ , c("MI_remote_r1","MI_remote_r2","MI_remote_r3","MI_remote_r4")], na.rm=TRUE)) %>%
  dplyr::select(gene,avg_control,avg_MI_IZ,avg_MI_remote)
## Calculate pseudobulk expression profiles for endocardial cells
endocard_seurat <- subset(calcagno_et_al, level_2 == "Endocardial")
sn_endo_bulk <- AverageExpression(endocard_seurat, group.by = c("time"),slot= "data")
Warning: `invoke()` is deprecated as of rlang 0.4.0.
Please use `exec()` or `inject()` instead.
This warning is displayed once every 8 hours.
sn_endo_bulk_df <- as.data.frame(sn_endo_bulk$RNA)
sn_endo_bulk_df$gene <- rownames(sn_endo_bulk_df)
## Merge average protein expression values with average RNA expression
rna_protein_avg <- left_join(protein_mat_avg,sn_endo_bulk_df, by = "gene") %>%
  drop_na()

corrplot_rna_protein <- ggplot(rna_protein_avg,aes(avg_control,D0, label = gene)) +
  geom_point() +
  geom_point(data = subset(rna_protein_avg, gene == "Vwf"),color = "red", size =3) 
corrplot_rna_protein

Version Author Date
ed31d81 FloWuenne 2023-07-02

Get endocard specific genes

endo_marker <- FindMarkers(calcagno_et_al,ident.1 = "Clust_Npr3",
                           only.pos = TRUE)
endo_marker$gene <- rownames(endo_marker)
endo_marker <- endo_marker %>%
  mutate("pct_diff" = pct.1 - pct.2) %>% # Only 
  subset(pct.2 < 0.1)                         

Calculate differentially expressed genes in endocardial cells in snRNA-seq

calcagno_et_al$cell_type_time <- paste(calcagno_et_al$level_2, calcagno_et_al$time,
    sep = "_")
Idents(calcagno_et_al) <- "cell_type_time"

endocard_de <- FindMarkers(calcagno_et_al, 
                           ident.1 = "Endocardial_D1", 
                           ident.2 = "Endocardial_D0",
                           min.diff.pct = 0.1,
                           logfc.threshold = 0,
                           verbose = FALSE)

colnames(endocard_de) <- gsub("\\.","_",colnames(endocard_de))
endocard_de <- endocard_de %>% 
  mutate("gene" = rownames(endocard_de)) %>%
  mutate("pct_ratio" = pct_2 /pct_1,
         "pct_diff" = pct_2 -pct_1) %>%
  arrange(desc(avg_log2FC))
merged_protein_rna <- left_join(endo_marker,miiz_vs_remote_signature, by = "gene")
merged_protein_rna <- merged_protein_rna %>%
  mutate("label_gene" = if_else(gene == "Vwf",gene,""))

endo_proteomic_corr <- ggplot(merged_protein_rna,aes(avg_log2FC,logFC,
                              label = label_gene)) +
  geom_point(data =subset(merged_protein_rna,gene != "Vwf"), size =3, fill = "darkgrey", pch = 21) +
  geom_point(data = subset(merged_protein_rna,gene == "Vwf"),size = 4, fill = "red", pch = 21) +
  geom_label_repel() +
  labs(x = "Average expression in Endocardial cells (snRNA-seq)",
       y = "Log-fold change MI_IZ vs control(proteomics)")

endo_proteomic_corr
Warning: Removed 156 rows containing missing values (`geom_point()`).
Warning: Removed 156 rows containing missing values (`geom_label_repel()`).

write.table(merged_protein_rna,
            file = "./output/proteomics/proteomics.snRNAseq_comp.tsv",
            sep = "\t",
            col.names = TRUE,
            row.names = FALSE,
            quote = FALSE)

sessionInfo()
R version 4.2.3 (2023-03-15)
Platform: aarch64-apple-darwin20 (64-bit)
Running under: macOS Ventura 13.5

Matrix products: default
BLAS:   /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices datasets  utils     methods   base     

other attached packages:
 [1] RColorBrewer_1.1-3      ggsci_3.0.0             cowplot_1.1.1          
 [4] SeuratDisk_0.0.0.9020   plotly_4.10.2           ggrepel_0.9.3          
 [7] data.table_1.14.8       Nebulosa_1.8.0          patchwork_1.1.2        
[10] Libra_1.7               nnls_1.4                here_1.0.1             
[13] Seurat_4.9.9.9058       SeuratObject_4.9.9.9091 sp_2.0-0               
[16] lubridate_1.9.2         forcats_1.0.0           stringr_1.5.0          
[19] dplyr_1.1.2             purrr_1.0.1             readr_2.1.4            
[22] tidyr_1.3.0             tibble_3.2.1            ggplot2_3.4.2          
[25] tidyverse_2.0.0         workflowr_1.7.0        

loaded via a namespace (and not attached):
  [1] utf8_1.2.3                  spatstat.explore_3.2-1     
  [3] reticulate_1.30             ks_1.14.0                  
  [5] tidyselect_1.2.0            htmlwidgets_1.6.2          
  [7] grid_4.2.3                  Rtsne_0.16                 
  [9] munsell_0.5.0               codetools_0.2-19           
 [11] ica_1.0-3                   future_1.33.0              
 [13] miniUI_0.1.1.1              withr_2.5.0                
 [15] spatstat.random_3.1-5       colorspace_2.1-0           
 [17] progressr_0.13.0            Biobase_2.58.0             
 [19] highr_0.10                  knitr_1.43                 
 [21] rstudioapi_0.15.0           stats4_4.2.3               
 [23] SingleCellExperiment_1.20.1 ROCR_1.0-11                
 [25] tensor_1.5                  listenv_0.9.0              
 [27] labeling_0.4.2              MatrixGenerics_1.10.0      
 [29] git2r_0.32.0                GenomeInfoDbData_1.2.9     
 [31] polyclip_1.10-4             farver_2.1.1               
 [33] bit64_4.0.5                 rprojroot_2.0.3            
 [35] parallelly_1.36.0           vctrs_0.6.3                
 [37] generics_0.1.3              xfun_0.39                  
 [39] timechange_0.2.0            R6_2.5.1                   
 [41] GenomeInfoDb_1.34.9         hdf5r_1.3.8                
 [43] bitops_1.0-7                spatstat.utils_3.0-3       
 [45] cachem_1.0.8                DelayedArray_0.24.0        
 [47] promises_1.2.0.1            scales_1.2.1               
 [49] gtable_0.3.3                globals_0.16.2             
 [51] processx_3.8.2              goftest_1.2-3              
 [53] spam_2.9-1                  rlang_1.1.1                
 [55] splines_4.2.3               lazyeval_0.2.2             
 [57] spatstat.geom_3.2-4         BiocManager_1.30.21.1      
 [59] yaml_2.3.7                  reshape2_1.4.4             
 [61] abind_1.4-5                 httpuv_1.6.11              
 [63] tools_4.2.3                 ellipsis_0.3.2             
 [65] jquerylib_0.1.4             BiocGenerics_0.44.0        
 [67] ggridges_0.5.4              Rcpp_1.0.11                
 [69] plyr_1.8.8                  sparseMatrixStats_1.10.0   
 [71] zlibbioc_1.44.0             RCurl_1.98-1.12            
 [73] ps_1.7.5                    deldir_1.0-9               
 [75] pbapply_1.7-2               S4Vectors_0.36.2           
 [77] zoo_1.8-12                  SummarizedExperiment_1.28.0
 [79] cluster_2.1.4               fs_1.6.3                   
 [81] magrittr_2.0.3              glmGamPoi_1.10.2           
 [83] RSpectra_0.16-1             scattermore_1.2            
 [85] lmtest_0.9-40               RANN_2.6.1                 
 [87] mvtnorm_1.2-2               whisker_0.4.1              
 [89] fitdistrplus_1.1-11         matrixStats_1.0.0          
 [91] hms_1.1.3                   mime_0.12                  
 [93] evaluate_0.21               xtable_1.8-4               
 [95] mclust_6.0.0                fastDummies_1.7.3          
 [97] IRanges_2.32.0              gridExtra_2.3              
 [99] compiler_4.2.3              KernSmooth_2.23-20         
[101] crayon_1.5.2                htmltools_0.5.5            
[103] later_1.3.1                 tzdb_0.4.0                 
[105] MASS_7.3-58.2               Matrix_1.5-3               
[107] cli_3.6.1                   parallel_4.2.3             
[109] dotCall64_1.0-2             igraph_1.5.0.1             
[111] GenomicRanges_1.50.2        pkgconfig_2.0.3            
[113] getPass_0.2-2               spatstat.sparse_3.0-2      
[115] bslib_0.5.0                 XVector_0.38.0             
[117] callr_3.7.3                 digest_0.6.33              
[119] sctransform_0.3.5           RcppAnnoy_0.0.21           
[121] pracma_2.4.2                spatstat.data_3.0-1        
[123] rmarkdown_2.23              leiden_0.4.3               
[125] uwot_0.1.16                 DelayedMatrixStats_1.20.0  
[127] shiny_1.7.4.1               lifecycle_1.0.3            
[129] nlme_3.1-162                jsonlite_1.8.7             
[131] limma_3.54.2                viridisLite_0.4.2          
[133] fansi_1.0.4                 pillar_1.9.0               
[135] lattice_0.20-45             fastmap_1.1.1              
[137] httr_1.4.6                  survival_3.5-3             
[139] glue_1.6.2                  png_0.1-8                  
[141] bit_4.0.5                   stringi_1.7.12             
[143] sass_0.4.7                  RcppHNSW_0.4.1             
[145] renv_1.0.0                  irlba_2.3.5.1              
[147] future.apply_1.11.0