Last updated: 2020-06-02
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Knit directory: Proteomics/analysis/
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library(SummarizedExperiment)
library(tidygraph)
library(DGCA)
library(proDA)
library(DESeq2)
library(cowplot)
library(igraph)
library(ggraph)
library(tidyverse)
Using datasets
load("../output/proteomic_LUMOS_20200430.RData")
load("../../var/patmeta_200522.RData")
load("../../var/ddsrna_180717.RData")
Using the protein complex information from database CORUM
int_pairs = read.table ("../data/proteins_in_complexes", sep = "\t", stringsAsFactors = FALSE, header = T)
I use the comparison of whether the patients have trisomy12 (a gain of extra copy of chromosome 12). The patients without trisomy12 are defined the as the reference.
The analysis goal is to see whether the gene dosage effect from the extra copy of trisomy12 affect protein complexes landscape in patient samples with trisomy12
Detect protein abundance changes related to trisomy12
exprMat <- assays(protCLL)[["count"]]
designMat <- data.frame(row.names = colnames(protCLL), IGHV = protCLL$IGHV.status, trisomy12 = protCLL$trisomy12)
fit <- proDA(exprMat, design = ~ .,
col_data = designMat)
corRes <- test_diff(fit, "trisomy121") %>%
dplyr::rename(id = name, logFC = diff, t=t_statistic,
P.Value = pval, adj.P.Val = adj_pval) %>%
mutate(name = rowData(protCLL[id,])$hgnc_symbol) %>%
select(name, id, logFC, t, P.Value, adj.P.Val) %>%
arrange(P.Value) %>% as_tibble()
corRes.sig <- filter(corRes, adj.P.Val <0.05) %>%
mutate(direction = ifelse(t>0, "Up","Down"))
The hypothesis of the algorithm is that the ratio (stoichiometry) of two proteins in a complex in the reference set follows a certain distribution. If the distribution of the ratios in the test set deviates from the distribution of the reference set, this indicates a change of stoichiometry in the test set and therefore a potential change of the complex formations.
One of the caveats of this algorithm is that it relies on outlier detection and therefore need hard cut-off values to define outliers and the fraction of outliers in the test set. Another caveat is that a simple up-regulation or down-regulation in the pair will also change the ratio. But this change of ratio may not really result from complex changes.
source ("../code/AlteredPQR.R")
quant_data_all = assays(protCLL)[["QRILC"]]
cols_with_reference_data = seq(ncol(protCLL))[protCLL$trisomy12 %in% 0]
RepresentativePairs = Altered_PQR(modif_z_score_threshold = 3.0, fraction_of_samples_threshold = 0.3)
[1] "Running"
[1] "..."
[1] "..."
[1] "Top 0.1, 1 and 5% upper and lower z-score values are: 8.26742846535531 3.93569392733038 2.19885719576535 and -6.27632295669363 -3.42621202641534 -1.92712652454253."
[1] "Top 1% of the absolute values for the modified z-scores is 4.55241553106446."
Re-format output
protRes.pqr <- lapply(RepresentativePairs, function(x) x) %>% bind_cols() %>%
separate(Protein_pair, into = c("idA","idB"),"-") %>%
mutate(protA = rowData(protCLL[idA,])$hgnc_symbol,
protB = rowData(protCLL[idB,])$hgnc_symbol,
chrA = rowData(protCLL[idA,])$chromosome_name,
chrB = rowData(protCLL[idB,])$chromosome_name) %>%
mutate(withChr12 = ifelse(chrA %in% "12" | chrB%in% "12", "yes", "no"))%>% mutate(idx = seq(nrow(.))) %>%
mutate(pair=map2_chr(idA, idB, ~paste0(sort(c(.x,.y)), collapse = "-")))
dds$trisomy12 <- patMeta[match(dds$PatID,patMeta$Patient.ID),]$trisomy12
rowData(dds)$uniprotID <- rownames(protCLL)[match(rownames(dds), rowData(protCLL)$ensembl_gene_id)]
ddsSub <- dds[!is.na(rowData(dds)$uniprotID), dds$PatID %in% colnames(protCLL)]
rownames(ddsSub) <- rowData(ddsSub)$uniprotID
ddsSub.vst <- varianceStabilizingTransformation(ddsSub)
source ("../code/AlteredPQR.R")
quant_data_all = assay(ddsSub.vst)
cols_with_reference_data = seq(ncol(ddsSub.vst))[ddsSub.vst$trisomy12 %in% 0]
RepresentativePairs = Altered_PQR(modif_z_score_threshold = 3.0, fraction_of_samples_threshold = 0.3)
[1] "Running"
[1] "..."
[1] "..."
[1] "Top 0.1, 1 and 5% upper and lower z-score values are: 9.02665546130853 3.95530891659894 2.44967137434484 and -6.48456606482675 -3.77874942568752 -2.3012824895991."
[1] "Top 1% of the absolute values for the modified z-scores is 4.61537110973003."
rnaRes.pqr <- lapply(RepresentativePairs, function(x) x) %>% bind_cols() %>%
separate(Protein_pair, into = c("idA","idB"),"-") %>%
dplyr::rename(rnaChange = Change, rnaScore= Score) %>%
mutate(pair=map2_chr(idA, idB, ~paste0(sort(c(.x,.y)), collapse = "-"))) %>%
select(pair, rnaScore, rnaChange)
Combine protein and RNA result
comRes.pqr <- left_join(protRes.pqr, rnaRes.pqr, by ="pair") %>%
mutate(explainedByRNA = ifelse(is.na(rnaChange), "no",
ifelse(Change == rnaChange, "yes", "no")))
Whether protein pairs involve genes on Chr12 have higher score?
ggplot(comRes.pqr, aes(x=Score, fill = withChr12, col = withChr12)) + geom_histogram(alpha=0.5, position = "identity") + theme_bw()
Not really, but there are some chr12 pairs have extremely high score.
How many of those changes can be explained at RNA level
table(comRes.pqr$explainedByRNA)
no yes
183 2
Only 2
List of detected pairs
comRes.pqr %>% select(protA, protB, Score, Change, chrA, chrB, withChr12, explainedByRNA) %>%
mutate(Score = format(Score, digits = 1)) %>%
DT::datatable()
Only pairs involving genes on chr12 are used for now Build network
comRes.filt <- filter(comRes.pqr, Score > 0, withChr12 == "yes")
#get node list
allNodes <- union(comRes.filt$protA, comRes.filt$protB)
nodeList <- data.frame(id = seq(length(allNodes))-1, name = allNodes, stringsAsFactors = FALSE) %>%
mutate(onChr12 = ifelse(rowData(protCLL[match(name, rowData(protCLL)$hgnc_symbol),])$chromosome_name %in% "12",
"chr12","otherChr")) %>%
mutate(group = corRes.sig[match(name, corRes.sig$name),]$direction) %>%
mutate(group = ifelse(is.na(group),"ns",group))
#get edge list
edgeList <- select(comRes.filt, protA, protB, Change, explainedByRNA) %>%
dplyr::rename(Source = protA, Target = protB) %>%
mutate(Source = nodeList[match(Source,nodeList$name),]$id,
Target = nodeList[match(Target, nodeList$name),]$id) %>%
data.frame(stringsAsFactors = FALSE)
net <- graph_from_data_frame(vertices = nodeList, d=edgeList, directed = FALSE)
Visualize using ggraph
tidyNet <- as_tbl_graph(net)
ggraph(tidyNet) + geom_edge_link(aes(color = Change, edge_linetype = explainedByRNA), width=1) +
geom_node_point(aes(color =group, shape = onChr12), size=4) +
geom_node_text(aes(label = name), repel = TRUE) +
scale_color_manual(values = c(Up = "pink",Down = "lightblue", ns="grey"))+
theme_graph()
In this plot, proteins on Chr12 are shown as solid circles and others are shown as triangles. The proteins up-regulated in trisomy12 samples are colored by red, down-regulated proteins are colored by cyan and the proteins with no significant changes are colored by grey. The color of the edges indication the whether the ratio of two proteins in pairs are increased or decreased in the reference group. But I don’t think this value has real biological meaning. It depends which protein is placed as the first one when calculating the ratio.
plotPair <- function(comRes, protList, protCLL, gene) {
pairList <- filter(comRes, protA %in% protList | protB %in% protList)
plotList <- lapply(seq(nrow(pairList)), function(i) {
idA <- pairList[i,]$idA
idB <- pairList[i,]$idB
protA <- pairList[i,]$protA
protB <- pairList[i,]$protB
idPair <- c(idA, idB)
protPair <- c(protA, protB)
ord <- order(protPair)
idPair <- idPair[ord]
protPair <- protPair[ord]
plotTab <- assays(protCLL)[["count"]][idPair,] %>%
t() %>% data.frame()
colnames(plotTab) <- protPair
plotTab$logRatio <- log2(plotTab[,1]) - log2(plotTab[,2])
plotTab <- rownames_to_column(plotTab,"patID") %>%
mutate(status = factor(protCLL[,patID][[gene]])) %>%
filter(!is.na(logRatio))
histP <- ggplot(plotTab, aes(x=logRatio, fill = status, col = status)) +
geom_histogram(position = "identity", alpha=0.5) +
ggtitle(sprintf("Stoichiometry: %s ~ %s",protPair[1], protPair[2]))
corP <- ggplot(plotTab, aes_string(x=protPair[1], y=protPair[2], col="status")) +
geom_point() + geom_smooth(formula = y~x, method = "lm") +
scale_color_discrete(name = gene)
plot_grid(histP, corP)
})
return(plotList)
}
plotPair.rna <- function(comRes, protList, ddsSub.vst, gene) {
pairList <- filter(comRes, protA %in% protList | protB %in% protList)
plotList <- lapply(seq(nrow(pairList)), function(i) {
idA <- pairList[i,]$idA
idB <- pairList[i,]$idB
protA <- pairList[i,]$protA
protB <- pairList[i,]$protB
idPair <- c(idA, idB)
protPair <- c(protA, protB)
ord <- order(protPair)
idPair <- idPair[ord]
protPair <- protPair[ord]
plotTab <- assay(ddsSub.vst)[idPair,] %>%
t() %>% data.frame()
colnames(plotTab) <- protPair
plotTab$logRatio <- log2(plotTab[,1]) - log2(plotTab[,2])
plotTab <- rownames_to_column(plotTab,"patID") %>%
mutate(status = factor(ddsSub.vst[,patID][[gene]])) %>%
filter(!is.na(logRatio))
histP <- ggplot(plotTab, aes(x=logRatio, fill = status, col = status)) +
geom_histogram(position = "identity", alpha=0.5) +
ggtitle(sprintf("Stoichiometry: %s ~ %s",protPair[1], protPair[2]))
corP <- ggplot(plotTab, aes_string(x=protPair[1], y=protPair[2], col="status")) +
geom_point() + geom_smooth(formula = y~x, method = "lm") +
scale_color_discrete(name = gene)
plot_grid(histP, corP)
})
return(plotList)
}
protList <- c("PTPN6","PTPN11")
plotPair(comRes.pqr, protList, protCLL, "trisomy12")
[[1]]
[[2]]
[[3]]
[[4]]
[[5]]
protList <- c("STAT2")
plotPair(comRes.pqr, protList, protCLL, "trisomy12")
[[1]]
[[2]]
protList <- c("PTPN6","PTPN11")
plotPair.rna(comRes.pqr, protList, ddsSub.vst, "trisomy12")
[[1]]
[[2]]
[[3]]
[[4]]
[[5]]
protList <- c("STAT2")
plotPair.rna(comRes.pqr, protList, ddsSub.vst, "trisomy12")
[[1]]
[[2]]
This approach is based on the hypothesis that if two proteins are in complexes, there abundance should be correlated among samples. The correlation changes are not affected by simple up-regulation or down-regulation. But the problem of this approach is that one needs a relatively larger sample size to detect real change of correlations. And therefore, this method seems to be two stringent in our dataset. In addition, the change of correlations in protein abundance can also be due to the change of gene expression changes, not necessarily only due to complex changes.
quant_data_all = assays(protCLL)[["QRILC"]]
quant_data_all <- quant_data_all[order(rownames(quant_data_all)),]
tri12 <- protCLL$trisomy12
designMat <- model.matrix(~tri12+0 )
colnames(designMat) <- c("WT","Tri12")
ddcor_res = ddcorAll(inputMat = quant_data_all, design = designMat,
compare = c("WT", "Tri12"),
adjust = "BH", heatmapPlot = FALSE, nPerm = 0, nPairs = "all")
Reformat output
comTab <- int_pairs %>%
mutate(pair = map2_chr(ProtA, ProtB, ~paste0(sort(c(.x, .y)),collapse = "-"))) %>%
separate(pair, c("Gene1","Gene2"), "-",remove = FALSE) %>%
select(Gene1, Gene2) %>% mutate(inComplex= TRUE)
allRes <- left_join(ddcor_res, comTab, by = c("Gene1","Gene2")) %>%
mutate(inComplex = ifelse(is.na(inComplex),FALSE,TRUE))
Distribution of p-values for protein in complexes and not in complexes
ggplot(allRes, aes(x=pValDiff, fill = inComplex)) + geom_histogram() + facet_wrap(~inComplex, scale="free") +
xlim(0,1)
Not much difference.
quant_data_all = assay(ddsSub.vst)
quant_data_all <- quant_data_all[order(rownames(quant_data_all)),]
tri12 <- ddsSub.vst$trisomy12
designMat <- model.matrix(~tri12+0 )
colnames(designMat) <- c("WT","Tri12")
ddcor_res = ddcorAll(inputMat = quant_data_all, design = designMat,
compare = c("WT", "Tri12"),
adjust = "BH", heatmapPlot = FALSE, nPerm = 0, nPairs = "all")
rnaRes.cor <- ddcor_res %>%
select(Gene1, Gene2, pValDiff, pValDiff_adj, Classes) %>%
dplyr::rename(p.rna = pValDiff, padj.rna = pValDiff_adj, Classes.rna = Classes)
Only for proteins involved in known complexes
comRes.cor <- filter(allRes, inComplex) %>%
mutate(protA = rowData(protCLL[Gene1,])$hgnc_symbol,
protB = rowData(protCLL[Gene2,])$hgnc_symbol,
chrA = rowData(protCLL[Gene1,])$chromosome_name,
chrB = rowData(protCLL[Gene2,])$chromosome_name) %>%
mutate(withChr12 = ifelse(chrA %in% "12" | chrB%in% "12", "yes", "no")) %>% mutate(idx = seq(nrow(.))) %>%
mutate(p=pValDiff,padj = pValDiff_adj)
Add test results from RNA
comRes.cor <- left_join(comRes.cor, rnaRes.cor, by =c("Gene1","Gene2")) %>%
mutate(explainedByRNA = ifelse(is.na(p.rna),"no",
ifelse(padj.rna < 0.25 & Classes == Classes.rna,"yes","no")))
P values for pair involving or not involving complex
ggplot(comRes.cor, aes(x=p, fill = withChr12, col = withChr12)) +
geom_histogram(alpha=0.5, position = "identity", col = NA) + facet_wrap(~withChr12, scale = "free") +
xlim(0,1)
List of significant pairs (25% FDR) As this test is very stringent, I use the looser FDR cut-off here.
comRes.sig <- filter(comRes.cor, withChr12 %in% c("yes")) %>%
mutate(padj = p.adjust(p, method = "BH"),
ifSig = padj <0.25) %>%
filter(ifSig)
comRes.sig %>% select(protA, protB, p, padj, chrA, chrB, withChr12, Classes, explainedByRNA) %>%
mutate_if(is.numeric, formatC, digits=2, format="e") %>%
DT::datatable()
“Classes” is the direction of changes. “+” means positive correlation, “-” means negative correlation, “0” means no correlation. “0/+” means no correlation in WT samples but positive correlation in tri12 samples; “+/0” means positive correlations in WT samples but no correlation in trisomy12 samples. Any types of correlation changes may suggest a change of complex formation behavior.
Visualize in network plot
comRes.filt <- filter(comRes.sig)
#comRes.filt <- comRes
#get node list
allNodes <- union(comRes.filt$protA, comRes.filt$protB)
nodeList <- data.frame(id = seq(length(allNodes))-1, name = allNodes, stringsAsFactors = FALSE) %>%
mutate(onChr12 = ifelse(rowData(protCLL[match(name, rowData(protCLL)$hgnc_symbol),])$chromosome_name %in% "12", "chr12","otherChr")) %>%
mutate(group = corRes.sig[match(name, corRes.sig$name),]$direction) %>%
mutate(group = ifelse(is.na(group),"ns",group)) %>%
mutate(nnSize = ifelse(onChr12 == "chr12",100, 1))
#get edge list
edgeList <- select(comRes.filt, protA, protB, p, Classes) %>%
dplyr::rename(Source = protA, Target = protB) %>%
mutate(Source = nodeList[match(Source,nodeList$name),]$id,
Target = nodeList[match(Target, nodeList$name),]$id,
Classes = as.character(Classes)) %>%
data.frame(stringsAsFactors = FALSE)
net <- graph_from_data_frame(vertices = nodeList, d=edgeList, directed = FALSE)
Visualize using ggraph
tidyNet <- as_tbl_graph(net)
ggraph(tidyNet) + geom_edge_link(aes(color = Classes), width=1) +
geom_node_point(aes(color =group, shape = onChr12), size=4) +
geom_node_text(aes(label = name), repel = TRUE) +
scale_color_manual(values = c(Up = "pink",Down = "lightblue", ns="grey"))+
theme_graph()
sessionInfo()
R version 3.6.0 (2019-04-26)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS 10.15.4
Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.6/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] parallel stats4 stats graphics grDevices utils datasets
[8] methods base
other attached packages:
[1] forcats_0.4.0 stringr_1.4.0
[3] dplyr_0.8.5 purrr_0.3.3
[5] readr_1.3.1 tidyr_1.0.0
[7] tibble_3.0.0 tidyverse_1.3.0
[9] ggraph_1.0.2 igraph_1.2.4.1
[11] cowplot_0.9.4 ggplot2_3.3.0
[13] DESeq2_1.24.0 proDA_1.1.2
[15] DGCA_1.0.2 tidygraph_1.1.2
[17] SummarizedExperiment_1.14.0 DelayedArray_0.10.0
[19] BiocParallel_1.18.0 matrixStats_0.54.0
[21] Biobase_2.44.0 GenomicRanges_1.36.0
[23] GenomeInfoDb_1.20.0 IRanges_2.18.1
[25] S4Vectors_0.22.0 BiocGenerics_0.30.0
loaded via a namespace (and not attached):
[1] readxl_1.3.1 backports_1.1.4 Hmisc_4.2-0
[4] workflowr_1.6.0 plyr_1.8.4 splines_3.6.0
[7] crosstalk_1.0.0 robust_0.4-18.1 digest_0.6.19
[10] foreach_1.4.4 htmltools_0.4.0 viridis_0.5.1
[13] GO.db_3.8.2 magrittr_1.5 checkmate_2.0.0
[16] memoise_1.1.0 fit.models_0.5-14 cluster_2.1.0
[19] doParallel_1.0.14 fastcluster_1.1.25 annotate_1.62.0
[22] modelr_0.1.5 colorspace_1.4-1 rvest_0.3.5
[25] blob_1.1.1 rrcov_1.4-9 ggrepel_0.8.1
[28] haven_2.2.0 xfun_0.8 crayon_1.3.4
[31] RCurl_1.95-4.12 jsonlite_1.6 genefilter_1.66.0
[34] impute_1.58.0 survival_2.44-1.1 iterators_1.0.10
[37] glue_1.3.2 polyclip_1.10-0 gtable_0.3.0
[40] zlibbioc_1.30.0 XVector_0.24.0 DEoptimR_1.0-8
[43] scales_1.1.0 mvtnorm_1.0-11 DBI_1.0.0
[46] Rcpp_1.0.1 viridisLite_0.3.0 xtable_1.8-4
[49] htmlTable_1.13.1 foreign_0.8-71 bit_1.1-14
[52] preprocessCore_1.46.0 Formula_1.2-3 DT_0.7
[55] htmlwidgets_1.3 httr_1.4.1 RColorBrewer_1.1-2
[58] acepack_1.4.1 ellipsis_0.2.0 pkgconfig_2.0.2
[61] XML_3.98-1.20 farver_2.0.3 nnet_7.3-12
[64] dbplyr_1.4.2 locfit_1.5-9.1 dynamicTreeCut_1.63-1
[67] labeling_0.3 tidyselect_1.0.0 rlang_0.4.5
[70] later_0.8.0 AnnotationDbi_1.46.0 cellranger_1.1.0
[73] munsell_0.5.0 tools_3.6.0 cli_1.1.0
[76] generics_0.0.2 RSQLite_2.1.1 broom_0.5.2
[79] evaluate_0.14 yaml_2.2.0 knitr_1.23
[82] bit64_0.9-7 fs_1.4.0 robustbase_0.93-5
[85] nlme_3.1-140 mime_0.7 xml2_1.2.2
[88] compiler_3.6.0 rstudioapi_0.10 reprex_0.3.0
[91] tweenr_1.0.1 geneplotter_1.62.0 pcaPP_1.9-73
[94] stringi_1.4.3 lattice_0.20-38 Matrix_1.2-17
[97] vctrs_0.2.4 pillar_1.4.3 lifecycle_0.2.0
[100] data.table_1.12.2 bitops_1.0-6 httpuv_1.5.1
[103] R6_2.4.0 latticeExtra_0.6-28 promises_1.0.1
[106] gridExtra_2.3 codetools_0.2-16 MASS_7.3-51.4
[109] assertthat_0.2.1 rprojroot_1.3-2 withr_2.1.2
[112] GenomeInfoDbData_1.2.1 mgcv_1.8-28 hms_0.5.2
[115] grid_3.6.0 rpart_4.1-15 rmarkdown_1.13
[118] git2r_0.26.1 ggforce_0.2.2 shiny_1.3.2
[121] lubridate_1.7.4 WGCNA_1.68 base64enc_0.1-3