SCREE
Last updated: 2023-06-03
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Knit directory: SCREE/
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Enhancer perturbation of scRNA-seq means that the targeted regions of sgRNA design include potential enhancer regions. And after perturbation, scRNA-seq is performed.
Data preparation
Add metadata to the SeuratObject
Add_meta_data is a function to add metadata into the SeuratObject, which will be used in the subsequent analyses, such as perturbations, percent.mt and replicate information.
mtx <- Add_meta_data(sg_lib = "enhancer-perturbation/sg_lib_all.txt",
mtx = "enhancer-perturbation/RNA.rds",
species = "Hs")
Quality control and sgRNA information visualization
SgRNA information visualization
sgRNA_quality_plot is a function to visualize sgRNA information, including cell numbers for each sgRNA and sgRNA numbers in each cell. We only label the top 10 sgRNA with the most cell numbers in the plot of cell numbers for each sgRNA. In addition, for each gene, we also label all sgRNA of it, in the plot of cell numbers for each sgRNA.
sgRNA_quality_plot(sg_lib = "enhancer-perturbation/sg_lib_all.txt",
mtx = mtx,
bar_width = NULL,
prefix = "example/enhancer",
label = "")
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Single-cell RNA-seq quality control and visualziation
scQC is a function to perform single-cell RNA-seq quality control based on "nFeature_RNA" (expressed gene numbers), "nCount_RNA" (total UMI count), "percent.mt" (mitochondrial genes percentage). Since scmageck_lr takes negative control as the baseline for all input cells (assuming all cells have negative control), users can also remove cells without sgRNAs using this function. In addition, this function can visualize the three metrics before and after quality control. Here we only take the violin plot before quality control as an example.
mtx_QC <- scQC(mtx = mtx,
species = "Hs",
prefix = "example/enhancer",
label = "",
gene_frac = 0.01,
nFeature = c(200, 100000),
nCount = 1000,
mt = 10,
blank_NTC = FALSE,
plot.show = FALSE,
plot.save = TRUE)
Perturbation efficiency evaluation and perturbation enrichment calculation
IntegratedMixscape is an integrated function to calculate the enrichment ratio for each perturbation in each cluster, calculate perturb signature, and evaluate perturbation efficiency for each sgRNA. The main functions of IntegratedMixscape are derived from the tutorial of Mixscape. For the example of enhancer-perturbation, we only calculate perturb signature for the reason that it may not be appropriate to evaluate perturbation efficiency for each enhancer. Users can perform clustering and perturbation enrichment via umap and CalculatePerturbEnrichment separately.
# Normalize and scale the data
mtx_QC <- normalize_scale(mtx = mtx_QC)
mixscape <- IntegratedMixscape(sg_lib = "enhancer-perturbation/sg_lib_all.txt",
mtx = mtx_QC,
NTC = "NTC",
prefix = "example/enhancer",
label = "",
perturb.sig.only = TRUE,
top = 20)
# Clustering
mtx_umap <- umap(mtx = mtx_QC,
assays = "RNA",
plot.return = FALSE,
prefix = "example/enhancer")
# Calculate perturbation enrichment
ratio <- CalculatePerturbEnrichment(mtx = mtx_umap,
sg_lib = "enhancer-perturbation/sg_lib_all.txt",
NTC = "NTC",
NTC.cal = TRUE,
range = c(0, 1),
prefix = "example/enhancer",
top = 20)
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As Mixscape calculates perturb signature for each cell labeled with perturbation, SCREE compares the clustering results and perturbation ratio of each cluster to evaluate the perturbation efficiency of each perturbation from another point of view.
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Regulatory score estimation and downstream analysis
Regulatory score estimation
improved_scmageck_lr is a modified function derived from scmageck_lr in the scmageck package, which can estimate the regulatory score of each perturbation to each gene, based on linear regression and estimate the corresponding p-value based on permutation. The output of improved_scmageck_lr is the transposed matrix of scmageck_lr output.
results <- improved_scmageck_lr(BARCODE = "enhancer-perturbation/sg_lib_all.txt",
RDS = mtx_QC,
NEGCTRL = "NTC",
SELECT_GENE = NULL,
LABEL = "improved",
PERMUTATION = 10000,
SAVEPATH = "example/enhancer",
LAMBDA = 0.01
NTC_baseline = TRUE)
score <- results[[1]][, -1]
pval <- results[[2]][, -1]
DE gene plot
DE_gene_plot is a function to visualize the distribution of potential target gene numbers that passed the threshold for each perturbation.
DE_gene_plot(score = score,
pval = pval,
project = "Enhancer-perturbation",
prefix = "example/enhancer",
label = "",
pval_cut = 0.05,
score_cut = 0.2,
sort_by = "number",
y_break = c(0, 1000),
width = 8,
height = 6)
Volcano plot
volcano is a function to visualize the distribution of regulatory score and corresponding p-value via volcano plot. All potential targets that passed the threshold will be colored and some top genes with the highest regulatory score will be labeled.
volcano(score = score,
pval = pval,
selected = NULL,
prefix = "example/enhancer",
label = "",
score_cut = 0.2,
pval_cut = 0.05,
height = 6,
width = 6,
showCategory = 5))
GO enrichment
GOenrichment is a function to perform GO enrichment analysis based on the score and p-value generated from improved_scmageck_lr. Users can only select a subset of perturbations to visualize.
GOenrichment(score = score,
pval = pval,
selected = NULL,
prefix = "example/enhancer",
score_cut = 0.2,
pval_cut = 0.05,
DE_gene_to_use = "all",
database = "org.Hs.eg.db",
gene_type = "Symbol",
showCategory = 10)
Potential target genes of the enhancer
Regulatory relationships
ciceroPlot is a function to visualize the regulatory relationships between perturbed enhancers and potential target genes nearby, based on regulatory score. The effect of the potential enhancers on genes close to it is equal to scores of the selected perturbations calculated by improved_scmageck_lr.
# Draw cicero plot for enhancer perturbation in RNA-seq input
ciceroPlot(score_dir = results[[1]], pval_dir = results[[2]], selected = "chr1.112010456.112010479", species = "Hs", version = "v75", gene_annotations = NULL, p_val_cut = 0.05, score_cut = 0, upstream = 2000000, downstream = 2000000, track_size = c(1,.3,.2,.3), include_axis_track = TRUE)
Expression visualization of genes around each enhancer region
EnhancerGeneExpression is a function to visualize the expression of all genes around each enhancer region. This function can be used to verify whether the regulatory score is agreed with the corresponding gene expression.
en <- EnhancerGeneExpression(sg_lib = sg_lib,
mtx = mtx_QC,
selected = NULL,
prefix = "example/enhancer",
upstream = 2000000,
downstream = 2000000,
gene_annotations = NULL,
species = "Hs",
version = "v75",
NTC = "NTC",
html_config = TRUE)
HTML outputs
SCREE provides functions to generate a summary HTML file based on all the output results of SCREE. config_generation generates a config in string format including the basic information, output figures, and tables. html_output generates the summary HTML file based on a template HTML file and the config from config_generation.
# Generate string of config
config <- config_generation(mtx = mtx,
mtx_QC = mtx_QC,
sg_lib = "enhancer-perturbation/sg_lib_all.txt",
score = score,
pval = pval,
project = "enhancer-perturbation",
prefix = "example/enhancer",
label = "",
species = "Hs",
version = "v75",
type = "enhancer",
NTC = "NTC",
article = "https://pubmed.ncbi.nlm.nih.gov/30849375/",
data = "https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE120861",
article_name = "A Genome-wide Framework for Mapping Gene Regulation via Cellular Genetic Screens",
data_name = "GSE120861",
gene_type = "Symbol",
score_cut = 0.2,
pval_cut = 0.05,
DA = NULL,
cicero = NULL,
enhancer = NULL)
# Generate html file based on the template file and the config.
html_output(html_dir = "enhancer_template.html",
config = config,
prefix = "example/enhancer",
replace = 3,
label = "")
sessionInfo()R version 4.0.2 (2020-06-22)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7
Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRblas.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/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 utils datasets methods base
other attached packages:
[1] workflowr_1.6.2
loaded via a namespace (and not attached):
[1] Rcpp_1.0.7 whisker_0.4 knitr_1.33 magrittr_2.0.1
[5] R6_2.5.0 rlang_0.4.11 fansi_0.5.0 stringr_1.4.0
[9] tools_4.0.2 xfun_0.25 utf8_1.2.2 git2r_0.28.0
[13] jquerylib_0.1.4 htmltools_0.5.1.1 ellipsis_0.3.2 rprojroot_2.0.2
[17] yaml_2.2.1 digest_0.6.27 tibble_3.1.3 lifecycle_1.0.0
[21] crayon_1.4.1 later_1.2.0 sass_0.4.0 vctrs_0.3.8
[25] promises_1.2.0.1 fs_1.5.0 glue_1.4.2 evaluate_0.14
[29] rmarkdown_2.10 stringi_1.7.3 bslib_0.2.5.1 compiler_4.0.2
[33] pillar_1.6.2 jsonlite_1.7.2 httpuv_1.6.1 pkgconfig_2.0.3