1. load libraries

2. load seurat object


All_samples_Merged <- readRDS("/home/nabbasi/isilon/PHD_3rd_YEAR_Analysis/0-Seurat_RDS_OBJECT_FINAL/All_samples_Merged_Harmony_integrated_Cell_line_renamed_03-07-2025.rds")

Subset L5 from Merged Object


# Assuming All_samples_Merged is already loaded
L5 <- subset(All_samples_Merged, subset = cell_line == "L5")

L5
An object of class Seurat 
62900 features across 6022 samples within 6 assays 
Active assay: SCT (26176 features, 3000 variable features)
 3 layers present: counts, data, scale.data
 5 other assays present: RNA, ADT, prediction.score.celltype.l1, prediction.score.celltype.l2, prediction.score.celltype.l3
 5 dimensional reductions calculated: integrated_dr, ref.umap, pca, umap, harmony
rm(All_samples_Merged)
gc()
            used   (Mb) gc trigger   (Mb)   max used    (Mb)
Ncells  14141577  755.3   20798778 1110.8   20798778  1110.8
Vcells 188348344 1437.0 1238941224 9452.4 1449986957 11062.6

3. QC

# Set identity classes to an existing column in meta data
Idents(object = L5) <- "cell_line"

L5[["percent.rb"]] <- PercentageFeatureSet(L5, pattern = "^RP[SL]")
VlnPlot(L5, features = c("nFeature_RNA", "nCount_RNA", "percent.mt", "percent.rb"),
        pt.size = 0.1, ncol = 4) & theme(plot.title = element_text(size = 10))
Avis : The `slot` argument of `FetchData()` is deprecated as of SeuratObject 5.0.0.
Please use the `layer` argument instead.Avis : `PackageCheck()` was deprecated in SeuratObject 5.0.0.
Please use `rlang::check_installed()` instead.

FeatureScatter(L5, feature1 = "nCount_RNA", feature2 = "percent.mt") + geom_smooth(method = "lm")

FeatureScatter(L5, feature1 = "nCount_RNA", feature2 = "nFeature_RNA") + geom_smooth(method = "lm")

Assign Cell-Cycle Scores

Running SCTransform on assay: RNA
Avis : The `slot` argument of `GetAssayData()` is deprecated as of SeuratObject 5.0.0.
Please use the `layer` argument instead.vst.flavor='v2' set. Using model with fixed slope and excluding poisson genes.
Calculating cell attributes from input UMI matrix: log_umi
Variance stabilizing transformation of count matrix of size 18690 by 6022
Model formula is y ~ log_umi
Get Negative Binomial regression parameters per gene
Using 2000 genes, 5000 cells
Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Found 118 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 18690 genes
Computing corrected count matrix for 18690 genes
Calculating gene attributes
Wall clock passed: Time difference of 51.03297 secs
Determine variable features

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Place corrected count matrix in counts slot
Avis : The `slot` argument of `SetAssayData()` is deprecated as of SeuratObject 5.0.0.
Please use the `layer` argument instead.Avis : Different cells and/or features from existing assay SCTSet default assay to SCT
Avis : The following features are not present in the object: MLF1IP, not searching for symbol synonymsAvis : The following features are not present in the object: FAM64A, HN1, not searching for symbol synonyms

4. Normalize data



# Apply SCTransform
L5 <- SCTransform(L5, vars.to.regress = c("percent.rb","percent.mt", "CC.Difference"), 
                  do.scale=TRUE, 
                  do.center=TRUE, 
                  verbose = TRUE)
Running SCTransform on assay: RNA
vst.flavor='v2' set. Using model with fixed slope and excluding poisson genes.
Calculating cell attributes from input UMI matrix: log_umi
Variance stabilizing transformation of count matrix of size 18690 by 6022
Model formula is y ~ log_umi
Get Negative Binomial regression parameters per gene
Using 2000 genes, 5000 cells
Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Avis : useNames = NA is deprecated. Instead, specify either useNames = TRUE or useNames = FALSE.Found 118 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 18690 genes
Computing corrected count matrix for 18690 genes
Calculating gene attributes
Wall clock passed: Time difference of 47.92601 secs
Determine variable features
Regressing out percent.rb, percent.mt, CC.Difference

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Centering and scaling data matrix

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Place corrected count matrix in counts slot
Set default assay to SCT
                                      

5. Perform PCA


Variables_genes <- L5@assays$SCT@var.features

# Exclude genes starting with "HLA-" AND "Xist" AND "TRBV, TRAV"
Variables_genes_after_exclusion <- Variables_genes[!grepl("^HLA-|^XIST|^TRBV|^TRAV", Variables_genes)]


# These are now standard steps in the Seurat workflow for visualization and clustering
L5 <- RunPCA(L5,
             features = Variables_genes_after_exclusion,
             do.print = TRUE, 
             pcs.print = 1:5, 
             genes.print = 15,
             npcs = 50)
PC_ 1 
Positive:  MALAT1, LGALS1, RPL35A, S100A6, ANXA5, CRIP1, RPS23, HINT1, TMSB4X, HPGD 
       KLF2, CD70, PIM2, RPS14, AHNAK, ITM2B, LGALS3, NEAT1, TMSB10, S1PR4 
       RACK1, S100A4, ITGA4, VIM, SUB1, SERP1, S100P, TNFSF10, AC097518.2, TNFRSF18 
Negative:  C1QBP, EIF5A, RPL26, EIF4A1, BATF3, GSTP1, CYC1, TPRG1, PFN1, MGST3 
       PDE4DIP, ALOX5AP, LTB, NAA38, C1orf162, HSPD1, YWHAE, PRDX1, HSP90B1, TXNDC17 
       NUDT8, SLC35F3, HMGN5, CCT6A, DNAJC5B, TRAP1, HSP90AB1, EMC6, PPID, PSMB6 
PC_ 2 
Positive:  B2M, S100A11, PFN1, RNASEK, IL32, S100A6, IL2RG, LSP1, GABARAP, FXYD5 
       GSTP1, CYBA, S100A10, LY6E, TMSB10, LGALS1, S1PR4, CD3D, EMP3, C12orf75 
       DDIT4, ACADVL, TAGLN2, S100A4, S100P, RPL26, LIME1, ARPC1B, OSTF1, RHOC 
Negative:  NPM1, RPL35A, HNRNPAB, NME1, RPL37, NME2, RPS23, RPS14, RPL23, HSPA9 
       NCL, CCT5, HSP90AB1, PABPC1, RACK1, DANCR, JPT1, RPL38, NDUFAF8, CANX 
       MBNL1, SLC7A11-AS1, CENPX, EIF4G1, AC097518.2, HSPE1, ODC1, NOP16, PHB, KPNB1 
PC_ 3 
Positive:  PMAIP1, CCR7, HERC5, OASL, IFIT2, ZC3HAV1, IFIT3, SPAG9, ISG15, TRAF1 
       CCL5, TNFAIP3, DENND4A, PARP14, PELI1, UBE2Z, NCF2, TNFSF9, CXCL10, SAR1A 
       GRAMD1B, GAS5, CAMK4, PLCG2, IFIH1, FAM162A, CSAG3, CITED2, ANKRD33B, TP63 
Negative:  H3F3A, KLF2, TUBA1B, TUBA4A, S1PR4, ARHGDIB, IL32, SLC9A3R1, S100A4, HPGD 
       HMGB1, RPL17, H2AFZ, MRPS12, S100P, NQO1, IFITM2, CORO1A, TNFRSF18, GMFG 
       MT-CO3, PSMB8, STMN1, IFITM1, CRIP1, UBE2S, CD320, H2AFX, RASGRP2, CALM1 
PC_ 4 
Positive:  ISG15, PPA1, OASL, CDC20, IFIT3, DNAJA1, ZBTB32, CCL5, DYNLL1, LTA 
       HERC5, IFIT2, HSPA8, SAR1A, CSAG3, PRDX1, PRR13, CCNB1, TNFSF9, NOP16 
       CD70, CXCL10, PMAIP1, CCR7, JPT1, DHX58, HSPA5, IL4I1, ZC3HAV1, TNF 
Negative:  HIST1H1E, HIST1H4C, HIST1H1B, HIST1H1C, MKI67, MTHFD2, HIST1H1A, RRM2, PSAT1, HIST1H1D 
       SMC1A, ATAD2, CEP128, AARS, PRKDC, MYH9, MT-ND6, TOP2A, CTH, GARS 
       NSD2, RDH10, TYMS, NEIL3, HIST1H2AE, PTPRR, SLC7A11, LMNB1, LRMP, HIST1H2AL 
PC_ 5 
Positive:  HIST1H4C, HERC5, IFIT3, IFIT2, OASL, ISG15, HIST1H1E, H2AFZ, RRM2, WARS 
       CTH, RHEBL1, PMAIP1, PSAT1, HIST1H1B, ZC3HAV1, NCF2, UBE2Z, ZBTB32, MTHFD2 
       HIST1H1C, CCL5, CHAC1, PKMYT1, DHX58, CD74, PCK2, H2AFX, CD70, PARP14 
Negative:  SLC2A3, ANKRD37, LDHA, BNIP3, PGK1, HSPA8, PLIN2, GPI, KIF2A, DEGS1 
       MIF, CDC20, UBE2S, GDE1, C4orf3, HILPDA, BNIP3L, PRELID3B, GLUL, PGAM1 
       ENO1, HIF1A-AS3, PRDM1, TPI1, TNFRSF11A, AK4, IRF4, FABP5, CYTIP, CCP110 
# determine dimensionality of the data
ElbowPlot(L5, ndims =50)

NA
NA

Perform PCA TEST



library(ggplot2)
library(RColorBrewer)  

# Assuming you have 10 different cell lines, generating a color palette with 10 colors
cell_line_colors <- brewer.pal(10, "Set3")

# Assuming L5$cell_line is a factor or character vector containing cell line names
data <- as.data.frame(table(L5$cell_line))
colnames(data) <- c("cell_line", "nUMI")  # Change column name to nUMI

ncells <- ggplot(data, aes(x = cell_line, y = nUMI, fill = cell_line)) + 
  geom_col() +
  theme_classic() +
  geom_text(aes(label = nUMI), 
            position = position_dodge(width = 0.9), 
            vjust = -0.25) +
  scale_fill_manual(values = cell_line_colors) + 
  theme(axis.text.x = element_text(angle = 45, hjust = 1),
        plot.title = element_text(hjust = 0.5)) +  # Adjust the title position
  ggtitle("Filtered cells per sample") +
  xlab("Cell lines") +  # Adjust x-axis label
  ylab("Frequency")    # Adjust y-axis label

print(ncells)




# TEST-1
# given that the output of RunPCA is "pca"
# replace "so" by the name of your seurat object

pct <- L5[["pca"]]@stdev / sum(L5[["pca"]]@stdev) * 100
cumu <- cumsum(pct) # Calculate cumulative percents for each PC
# Determine the difference between variation of PC and subsequent PC
co2 <- sort(which((pct[-length(pct)] - pct[-1]) > 0.1), decreasing = T)[1] + 1
# last point where change of % of variation is more than 0.1%. -> co2
co2
[1] 16
# TEST-2
# get significant PCs
stdv <- L5[["pca"]]@stdev
sum.stdv <- sum(L5[["pca"]]@stdev)
percent.stdv <- (stdv / sum.stdv) * 100
cumulative <- cumsum(percent.stdv)
co1 <- which(cumulative > 90 & percent.stdv < 5)[1]
co2 <- sort(which((percent.stdv[1:length(percent.stdv) - 1] - 
                       percent.stdv[2:length(percent.stdv)]) > 0.1), 
              decreasing = T)[1] + 1
min.pc <- min(co1, co2)
min.pc
[1] 16
# Create a dataframe with values
plot_df <- data.frame(pct = percent.stdv, 
           cumu = cumulative, 
           rank = 1:length(percent.stdv))

# Elbow plot to visualize 
  ggplot(plot_df, aes(cumulative, percent.stdv, label = rank, color = rank > min.pc)) + 
  geom_text() + 
  geom_vline(xintercept = 90, color = "grey") + 
  geom_hline(yintercept = min(percent.stdv[percent.stdv > 5]), color = "grey") +
  theme_bw()

NA
NA
NA

6. Clustering

L5 <- FindNeighbors(L5, 
                    dims = 1:min.pc, 
                    verbose = FALSE)

# understanding resolution
L5 <- FindClusters(L5, 
                  resolution = c(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 
                                0.7,0.8, 0.9, 1, 1.1, 1.2))
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.9374
Number of communities: 4
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.9031
Number of communities: 5
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8795
Number of communities: 7
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8603
Number of communities: 8
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8433
Number of communities: 8
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8264
Number of communities: 8
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8111
Number of communities: 10
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7987
Number of communities: 12
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7886
Number of communities: 11
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7786
Number of communities: 12
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7702
Number of communities: 14
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 6022
Number of edges: 209855

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7618
Number of communities: 15
Elapsed time: 0 seconds

# non-linear dimensionality reduction --------------
L5 <- RunUMAP(L5, 
              dims = 1:min.pc,
              verbose = FALSE)
Avis : 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
                                  

# note that you can set `label = TRUE` or use the Label Clusters function to help label
# individual clusters
DimPlot(L5,group.by = "cell_line", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)



DimPlot(L5,
        group.by = "SCT_snn_res.0.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.3", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.4", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)



DimPlot(L5,
        group.by = "SCT_snn_res.0.5", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.6", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.7", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.8", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.9", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.1.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.1.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

7. clusTree

library(clustree)

clustree(L5, prefix = "SCT_snn_res.")

8. Save the Seurat object as an RDS-L5


saveRDS(L5, file = "../0-RDS_Cell_lines/L5_clustered.rds")
---
title: "Cell Line L5 Analysis-Reclustering"
author: Nasir Mahmood Abbasi
date: "`r Sys.Date()`"
output:
  # pdf_document: default
  # word_document: default
  # html_document: default
  #rmdformats::readthedown
  html_notebook:
    toc: true
    toc_float: true
    toc_collapsed: true
---


# 1. load libraries
```{r setup, include=FALSE}

library(Seurat)
library(SeuratObject)
library(SeuratData)
library(patchwork)

library(dplyr)
library(ggplot2)
library(RColorBrewer)
library(magrittr)
library(dbplyr)
library(rmarkdown)
library(knitr)
library(tinytex)
#Azimuth Annotation libraries
library(Azimuth)
#ProjecTils Annotation libraries
library(STACAS)
library(ProjecTILs)
#singleR Annotation libraries
library(SingleR)
library(celldex)
library(SingleCellExperiment)

```
# 2. load seurat object
```{r load_seurat}

All_samples_Merged <- readRDS("/home/nabbasi/isilon/PHD_3rd_YEAR_Analysis/0-Seurat_RDS_OBJECT_FINAL/All_samples_Merged_Harmony_integrated_Cell_line_renamed_03-07-2025.rds")



```

## Subset L5 from Merged Object
```{r}

# Assuming All_samples_Merged is already loaded
L5 <- subset(All_samples_Merged, subset = cell_line == "L5")

L5

rm(All_samples_Merged)
gc()
```


# 3. QC
```{r QC, fig.height=6, fig.width=10}
# Set identity classes to an existing column in meta data
Idents(object = L5) <- "cell_line"

L5[["percent.rb"]] <- PercentageFeatureSet(L5, pattern = "^RP[SL]")
VlnPlot(L5, features = c("nFeature_RNA", "nCount_RNA", "percent.mt", "percent.rb"),
        pt.size = 0.1, ncol = 4) & theme(plot.title = element_text(size = 10))

FeatureScatter(L5, feature1 = "nCount_RNA", feature2 = "percent.mt") + geom_smooth(method = "lm")
FeatureScatter(L5, feature1 = "nCount_RNA", feature2 = "nFeature_RNA") + geom_smooth(method = "lm")

```

## Assign Cell-Cycle Scores
```{r Regress, echo=FALSE, fig.height=6, fig.width=10}

#remotes::install_version("matrixStats", version="1.1.0") (if you are running R server use this first)
L5 <- SCTransform(L5, do.scale=FALSE, do.center=FALSE)


# A list of cell cycle markers, from Tirosh et al, 2015, is loaded with Seurat.  We can
# segregate this list into markers of G2/M phase and markers of S phase
s.genes <- cc.genes$s.genes
g2m.genes <- cc.genes$g2m.genes


L5 <- CellCycleScoring(L5, s.features = s.genes, 
                           g2m.features = g2m.genes, 
                           set.ident = TRUE)

DefaultAssay(L5) <- "RNA"

L5$CC.Difference <- L5$S.Score - L5$G2M.Score

```

# 4. Normalize data
```{r}


# Apply SCTransform
L5 <- SCTransform(L5, vars.to.regress = c("percent.rb","percent.mt", "CC.Difference"), 
                  do.scale=TRUE, 
                  do.center=TRUE, 
                  verbose = TRUE)
                                      
```


# 5. Perform PCA
```{r PCA, fig.height=4, fig.width=6}

Variables_genes <- L5@assays$SCT@var.features

# Exclude genes starting with "HLA-" AND "Xist" AND "TRBV, TRAV"
Variables_genes_after_exclusion <- Variables_genes[!grepl("^HLA-|^XIST|^TRBV|^TRAV", Variables_genes)]


# These are now standard steps in the Seurat workflow for visualization and clustering
L5 <- RunPCA(L5,
             features = Variables_genes_after_exclusion,
             do.print = TRUE, 
             pcs.print = 1:5, 
             genes.print = 15,
             npcs = 50)

# determine dimensionality of the data
ElbowPlot(L5, ndims =50)


```
# Perform PCA TEST
```{r PCA-TEST, fig.height=6, fig.width=10}


library(ggplot2)
library(RColorBrewer)  

# Assuming you have 10 different cell lines, generating a color palette with 10 colors
cell_line_colors <- brewer.pal(10, "Set3")

# Assuming L5$cell_line is a factor or character vector containing cell line names
data <- as.data.frame(table(L5$cell_line))
colnames(data) <- c("cell_line", "nUMI")  # Change column name to nUMI

ncells <- ggplot(data, aes(x = cell_line, y = nUMI, fill = cell_line)) + 
  geom_col() +
  theme_classic() +
  geom_text(aes(label = nUMI), 
            position = position_dodge(width = 0.9), 
            vjust = -0.25) +
  scale_fill_manual(values = cell_line_colors) + 
  theme(axis.text.x = element_text(angle = 45, hjust = 1),
        plot.title = element_text(hjust = 0.5)) +  # Adjust the title position
  ggtitle("Filtered cells per sample") +
  xlab("Cell lines") +  # Adjust x-axis label
  ylab("Frequency")    # Adjust y-axis label

print(ncells)



# TEST-1
# given that the output of RunPCA is "pca"
# replace "so" by the name of your seurat object

pct <- L5[["pca"]]@stdev / sum(L5[["pca"]]@stdev) * 100
cumu <- cumsum(pct) # Calculate cumulative percents for each PC
# Determine the difference between variation of PC and subsequent PC
co2 <- sort(which((pct[-length(pct)] - pct[-1]) > 0.1), decreasing = T)[1] + 1
# last point where change of % of variation is more than 0.1%. -> co2
co2

# TEST-2
# get significant PCs
stdv <- L5[["pca"]]@stdev
sum.stdv <- sum(L5[["pca"]]@stdev)
percent.stdv <- (stdv / sum.stdv) * 100
cumulative <- cumsum(percent.stdv)
co1 <- which(cumulative > 90 & percent.stdv < 5)[1]
co2 <- sort(which((percent.stdv[1:length(percent.stdv) - 1] - 
                       percent.stdv[2:length(percent.stdv)]) > 0.1), 
              decreasing = T)[1] + 1
min.pc <- min(co1, co2)
min.pc

# Create a dataframe with values
plot_df <- data.frame(pct = percent.stdv, 
           cumu = cumulative, 
           rank = 1:length(percent.stdv))

# Elbow plot to visualize 
  ggplot(plot_df, aes(cumulative, percent.stdv, label = rank, color = rank > min.pc)) + 
  geom_text() + 
  geom_vline(xintercept = 90, color = "grey") + 
  geom_hline(yintercept = min(percent.stdv[percent.stdv > 5]), color = "grey") +
  theme_bw()

  

```

# 6. Clustering
```{r C1, fig.height=4, fig.width=6}
L5 <- FindNeighbors(L5, 
                    dims = 1:min.pc, 
                    verbose = FALSE)

# understanding resolution
L5 <- FindClusters(L5, 
                  resolution = c(0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 
                                0.7,0.8, 0.9, 1, 1.1, 1.2))


```


```{r C2, fig.height=4, fig.width=6}

# non-linear dimensionality reduction --------------
L5 <- RunUMAP(L5, 
              dims = 1:min.pc,
              verbose = FALSE)
                                  

# note that you can set `label = TRUE` or use the Label Clusters function to help label
# individual clusters
DimPlot(L5,group.by = "cell_line", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.3", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.4", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L5,
        group.by = "SCT_snn_res.0.5", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.6", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.7", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L5,
        group.by = "SCT_snn_res.0.8", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L5,
        group.by = "SCT_snn_res.0.9", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L5,
        group.by = "SCT_snn_res.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L5,
        group.by = "SCT_snn_res.1.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L5,
        group.by = "SCT_snn_res.1.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

```

# 7. clusTree
```{r clusTree, fig.height=12, fig.width=10}
library(clustree)

clustree(L5, prefix = "SCT_snn_res.")

```

# 8. Save the Seurat object as an RDS-L5
```{r saveROBJ, echo=TRUE}

saveRDS(L5, file = "../0-RDS_Cell_lines/L5_clustered.rds")


```










