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 L6 from Merged Object


# Assuming All_samples_Merged is already loaded
L6 <- subset(All_samples_Merged, subset = cell_line == "L6")

L6
An object of class Seurat 
62900 features across 5148 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  14139797  755.2   20819294 1111.9   20819294  1111.9
Vcells 157751026 1203.6 1247820143 9520.2 1412200213 10774.3

3. QC

# Set identity classes to an existing column in meta data
Idents(object = L6) <- "cell_line"

L6[["percent.rb"]] <- PercentageFeatureSet(L6, pattern = "^RP[SL]")
VlnPlot(L6, 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(L6, feature1 = "nCount_RNA", feature2 = "percent.mt") + geom_smooth(method = "lm")

FeatureScatter(L6, 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 18079 by 5148
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 71 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 18079 genes
Computing corrected count matrix for 18079 genes
Calculating gene attributes
Wall clock passed: Time difference of 46.96784 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
L6 <- SCTransform(L6, 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 18079 by 5148
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 71 outliers - those will be ignored in fitting/regularization step

Second step: Get residuals using fitted parameters for 18079 genes
Computing corrected count matrix for 18079 genes
Calculating gene attributes
Wall clock passed: Time difference of 43.33022 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 <- L6@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
L6 <- RunPCA(L6,
             features = Variables_genes_after_exclusion,
             do.print = TRUE, 
             pcs.print = 1:5, 
             genes.print = 15,
             npcs = 50)
PC_ 1 
Positive:  LRBA, RABGAP1L, DENND4A, MBNL1, GRAMD1B, TIAM2, ATXN1, SIK3, NCALD, RYR2 
       NFAT5, ELMO1, PICALM, ANKRD28, NCOA3, VPS13B, LYST, TSHZ2, MAGI1, MED12L 
       PAM, ATP2C1, PTPRJ, PVT1, LDLRAD4, RFX3, NCOA1, ANKRD33B, ZEB2, RUNX1 
Negative:  TUBA1B, ACTB, HMGB2, PFN1, CORO1A, STMN1, TMSB4X, IL32, H2AFZ, TUBB 
       HMGB1, TUBA4A, ARHGDIB, SLC9A3R1, H2AFV, TYMS, RAC2, S100A4, FTH1, CD74 
       MYL12A, B2M, HMGN2, IFITM1, LIMD2, CLIC1, MYL6, PSMB9, TK1, DUT 
PC_ 2 
Positive:  DUT, RRM2, PSAT1, HIST1H4C, PCLAF, H2AFZ, TYMS, SMC4, TUBB, TUBA1B 
       NEIL3, RPS2, DHFR, NSD2, HIST1H1E, MKI67, SOS1, TOP2A, CCNA2, IARS 
       H2AFX, HMGB2, DIAPH3, MCM3, MTHFD2, LMNB1, BRCA1, SLFN12L, GARS, ENOSF1 
Negative:  LGALS3, IL2RG, SH3BGRL3, RGCC, CCL1, CD82, LGALS1, DUSP4, CD52, SRGN 
       IL4I1, LMNA, SQSTM1, SERPINE1, GZMB, IQCG, TNFSF9, S100A11, CD2, CFLAR 
       MFSD10, CCL3, S100A6, CAVIN3, CCL4, JUND, IGFLR1, TNFAIP8, TAGLN2, MT2A 
PC_ 3 
Positive:  NPM1, CCR7, HSP90AB1, RPL22L1, RPL35A, SEC11C, NME1, MIR155HG, EEF1A1, HSPD1 
       WARS, RPL7A, TUBA3C, PRDX1, RPL5, ENO1, RPS18, STAT1, CFAP57, HMGA1 
       MT1E, HMGN5, RPL23, HSPE1, RPS6, BATF3, LTA, RPS2, NME2, RRP1B 
Negative:  S100A4, IL32, EVL, LCK, CD3E, ALOX5AP, PTPRC, CTSW, ITM2B, TUBA4A 
       ARHGDIB, COTL1, MAL, CORO1A, LAPTM5, STK17B, CD52, CXCR3, SH3BGRL3, IFITM2 
       CD99, NCR3, H3F3A, ENTPD1, S100A6, TMSB4X, LTB, FXYD5, ANXA5, HCST 
PC_ 4 
Positive:  HIST1H4C, RRM2, HIST1H1E, HIST1H1C, PKMYT1, TYMS, TUBB, TK1, STMN1, NUSAP1 
       MTHFD2, EIF1, CENPM, DUT, H2AFX, MKI67, HIST2H2AC, PCLAF, ESCO2, TOP2A 
       PCNA, ATAD2, KIFC1, NDC80, MALAT1, CDCA5, HIST1H1D, SMC4, UBE2T, EZH2 
Negative:  PTTG1, JPT1, PPIB, HSPA8, HSP90AB1, CDC20, HNRNPA2B1, HSPE1, PSME2, CCT5 
       CCNB1, HSP90B1, PPP1R14B, LDHA, DANCR, ANXA2, CYP51A1, ABCE1, BST2, SNHG3 
       YWHAZ, FASN, SFPQ, HNRNPH3, NOP16, HPDL, GPR15, TROAP, FUT7, IFITM1 
PC_ 5 
Positive:  IFIT3, OASL, HERC5, IFIT2, ISG15, ZC3HAV1, PMAIP1, IFIT1, IFIH1, PARP14 
       CCL5, PLCG2, RSAD2, CXCL10, ZBTB32, NCF2, SAR1A, CSAG3, PLAAT4, PELI1 
       SPAG9, TTC28, B2M, KDM6A, RHEBL1, CMPK2, RPS6KC1, GBP4, DDX58, RNF149 
Negative:  RPL6, CCL1, GZMB, RPL5, RPL23, CAVIN3, RPS7, PABPC1, PTPN7, RGCC 
       ZBED2, CTIF, RPL17, LINC02341, GJB6, PTPN6, UCP3, AL117329.1, NPM1, SMARCA2 
       FABP5, TNIP3, LYST, SKAP1, GNLY, RPL7, XCL1, BCAT1, LDLRAD4, CCL4 
# determine dimensionality of the data
ElbowPlot(L6, 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 L6$cell_line is a factor or character vector containing cell line names
data <- as.data.frame(table(L6$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 <- L6[["pca"]]@stdev / sum(L6[["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] 12
# TEST-2
# get significant PCs
stdv <- L6[["pca"]]@stdev
sum.stdv <- sum(L6[["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] 12
# 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

L6 <- FindNeighbors(L6, 
                    dims = 1:min.pc, 
                    verbose = FALSE)

# understanding resolution
L6 <- FindClusters(L6, 
                  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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.9033
Number of communities: 2
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8383
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.8021
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7813
Number of communities: 6
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7611
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7459
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7329
Number of communities: 9
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7191
Number of communities: 9
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.7053
Number of communities: 9
Elapsed time: 0 seconds
Modularity Optimizer version 1.3.0 by Ludo Waltman and Nees Jan van Eck

Number of nodes: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.6936
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.6830
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: 5148
Number of edges: 162887

Running Louvain algorithm...
0%   10   20   30   40   50   60   70   80   90   100%
[----|----|----|----|----|----|----|----|----|----|
**************************************************|
Maximum modularity in 10 random starts: 0.6736
Number of communities: 14
Elapsed time: 0 seconds

# non-linear dimensionality reduction --------------
L6 <- RunUMAP(L6, 
              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(L6,group.by = "cell_line", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)



DimPlot(L6,
        group.by = "SCT_snn_res.0.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.3", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.4", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)



DimPlot(L6,
        group.by = "SCT_snn_res.0.5", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.6", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.7", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.8", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.9", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.1.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.1.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

7. clusTree

library(clustree)
Le chargement a nécessité le package : ggraph

Attachement du package : 'ggraph'

L'objet suivant est masqué depuis 'package:sp':

    geometry
clustree(L6, prefix = "SCT_snn_res.")

8. Save the Seurat object as an RDS-L6


saveRDS(L6, file = "../0-RDS_Cell_lines/L6_clustered.rds")
---
title: "Cell Line L6 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 L6 from Merged Object
```{r}

# Assuming All_samples_Merged is already loaded
L6 <- subset(All_samples_Merged, subset = cell_line == "L6")

L6

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 = L6) <- "cell_line"

L6[["percent.rb"]] <- PercentageFeatureSet(L6, pattern = "^RP[SL]")
VlnPlot(L6, features = c("nFeature_RNA", "nCount_RNA", "percent.mt", "percent.rb"),
        pt.size = 0.1, ncol = 4) & theme(plot.title = element_text(size = 10))

FeatureScatter(L6, feature1 = "nCount_RNA", feature2 = "percent.mt") + geom_smooth(method = "lm")
FeatureScatter(L6, 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)
L6 <- SCTransform(L6, 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


L6 <- CellCycleScoring(L6, s.features = s.genes, 
                           g2m.features = g2m.genes, 
                           set.ident = TRUE)

DefaultAssay(L6) <- "RNA"

L6$CC.Difference <- L6$S.Score - L6$G2M.Score

```

# 4. Normalize data
```{r}


# Apply SCTransform
L6 <- SCTransform(L6, 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 <- L6@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
L6 <- RunPCA(L6,
             features = Variables_genes_after_exclusion,
             do.print = TRUE, 
             pcs.print = 1:5, 
             genes.print = 15,
             npcs = 50)

# determine dimensionality of the data
ElbowPlot(L6, 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 L6$cell_line is a factor or character vector containing cell line names
data <- as.data.frame(table(L6$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 <- L6[["pca"]]@stdev / sum(L6[["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 <- L6[["pca"]]@stdev
sum.stdv <- sum(L6[["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}
L6 <- FindNeighbors(L6, 
                    dims = 1:min.pc, 
                    verbose = FALSE)

# understanding resolution
L6 <- FindClusters(L6, 
                  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 --------------
L6 <- RunUMAP(L6, 
              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(L6,group.by = "cell_line", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.2", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.3", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.4", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)


DimPlot(L6,
        group.by = "SCT_snn_res.0.5", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.6", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.7", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)

DimPlot(L6,
        group.by = "SCT_snn_res.0.8", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L6,
        group.by = "SCT_snn_res.0.9", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L6,
        group.by = "SCT_snn_res.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L6,
        group.by = "SCT_snn_res.1.1", 
        reduction = "umap",
        label.size = 3,
        repel = T,
        label = T, label.box = T)
DimPlot(L6,
        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(L6, prefix = "SCT_snn_res.")

```

# 8. Save the Seurat object as an RDS-L6
```{r saveROBJ, echo=TRUE}

saveRDS(L6, file = "../0-RDS_Cell_lines/L6_clustered.rds")


```










