Single-nucleus transcriptomics identifies cell cycle and synaptic pathway dysregulation during OPC-to-glioma progression.
The 4 matches
- [1] § Materials and methods › Single-nucleus RNA sequencing annotation ↔ celltype_analysis.Rmd, lines 265–283 · score 0.93 · L6 CT, Sst Chodl, Glutamatergic Neurons, GABAergic, median, Car3
- [2] § Materials and methods › snRNA-seq raw data processing, integration, clustering analysis ↔ celltype_analysis.Rmd, lines 224–249 · score 0.78 · finding variable, module scoring, log normalization, neighbors, resolution, regression
- [3] § Materials and methods › Inferred CNV analysis ↔ infercnv.Rmd, lines 6–31 · score 0.67 · infer CNV, HMM, denoise, Genomics, cutoff, raw
- [4] § Materials and methods › Cell cycle position analysis with TRICYCLE ↔ tricycle.Rmd, lines 120–184 · score 0.61 · project_cycle_space, cycle position, TRICYCLE, cell, Tumor
Paper
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The authors' code
R Markdown · 321 lines · 13 KB · no license · 2 matches
- ---
- title: "R Notebook"
- output: html_notebook
- editor_options:
- chunk_output_type: console
- ---
- ```{r}
- library(Seurat)
- library(ggplot2)
- library(dplyr)
- library(RColorBrewer)
- ```
- ```{r}
- setwd("C:/Users/denni/OneDrive/Desktop/Frontiers Resubmission/bioinformatics work/")
- nBrain <- Read10X(data.dir = "filtered_cellranger_output//10X_5KadultMouse/5k_mouse_brain_CNIK_3pv3_raw_feature_bc_matrix/")
- nBrain_seurat <- CreateSeuratObject(counts = nBrain, project = "normal Brain", min.features = 150)
- nBrain_seurat[["percent.mt"]] <- PercentageFeatureSet(nBrain_seurat, pattern = "^mt-")
- nBrain_subset <- subset(nBrain_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000 & percent.mt < 10)
- nBrain_subset <- subset(nBrain_subset, cells = sample(names(nBrain_subset$orig.ident), size = 5000))
- Early_L2 <- Read10X(data.dir = "filtered_cellranger_output/Early-stage L2/")
- Early_L2_seurat <- CreateSeuratObject(counts = Early_L2, project = "E1", min.features = 150)
- Early_L2_seurat[["percent.mt"]] <- PercentageFeatureSet(Early_L2_seurat, pattern = "^mt-")
- Early_L2_subset <- subset(Early_L2_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- Early_R2L3 <- Read10X(data.dir = "filtered_cellranger_output/Early-stage R2L3/")
- Early_R2L3_seurat <- CreateSeuratObject(counts = Early_R2L3, project = "E2", min.features = 150)
- Early_R2L3_seurat[["percent.mt"]] <- PercentageFeatureSet(Early_R2L3_seurat, pattern = "^mt-")
- Early_R2L3_subset <- subset(Early_R2L3_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- Early_R2L5 <- Read10X(data.dir = "filtered_cellranger_output/Early-stage R2L5/")
- Early_R2L5_seurat <- CreateSeuratObject(counts = Early_R2L5, project = "E3", min.features = 150)
- Early_R2L5_seurat[["percent.mt"]] <- PercentageFeatureSet(Early_R2L5_seurat, pattern = "^mt-")
- Early_R2L5_subset <- subset(Early_R2L5_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- Late_L3 <- Read10X(data.dir = "filtered_cellranger_output/Late-stage L3/")
- Late_L3_seurat <- CreateSeuratObject(counts = Late_L3, project = "L1", min.features = 150)
- Late_L3_seurat[["percent.mt"]] <- PercentageFeatureSet(Late_L3_seurat, pattern = "^mt-")
- Late_L3_subset <- subset(Late_L3_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- Late_L5 <- Read10X(data.dir = "filtered_cellranger_output/Late-stage L5/")
- Late_L5_seurat <- CreateSeuratObject(counts = Late_L5, project = "L2", min.features = 150)
- Late_L5_seurat[["percent.mt"]] <- PercentageFeatureSet(Late_L5_seurat, pattern = "^mt-")
- Late_L5_subset <- subset(Late_L5_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- Late_R2L2 <- Read10X(data.dir = "filtered_cellranger_output/Late-stage R2L2/")
- Late_R2L2_seurat <- CreateSeuratObject(counts = Late_R2L2, project = "L3", min.features = 150)
- Late_R2L2_seurat[["percent.mt"]] <- PercentageFeatureSet(Late_R2L2_seurat, pattern = "^mt-")
- Late_R2L2_subset <- subset(Late_R2L2_seurat, subset = nFeature_RNA >= 600 & nFeature_RNA <= 6000)
- ```
- ```{r}
- remove(Early_L2)
- remove(Early_L2_seurat)
- remove(Early_R2L3)
- remove(Early_R2L3_seurat)
- remove(Early_R2L5)
- remove(Early_R2L5_seurat)
- remove(nBrain)
- remove(nBrain_seurat)
- remove(Late_L3)
- remove(Late_L3_seurat)
- remove(Late_L5)
- remove(Late_L5_seurat)
- remove(Late_R2L2)
- remove(Late_R2L2_seurat)
- ```
- ```{r}
- Tumors.merged <- merge(x = Early_R2L3_subset,
- y = c(Early_R2L5_subset, Early_L2_subset,
- Late_L3_subset, Late_L5_subset, Late_R2L2_subset),
- add.cell.ids = c("Early_R2L3", "Early_R2L5", "Early_L2",
- "Late_L3", "Late_L5", "Late_R2L2"),
- project = "BBp53n Tumors")
- [email hidden]$tissue <- "NA"
- [email hidden][[email hidden]$orig.ident %in% "E1", ]$tissue <- "Early-Tumors"
- [email hidden][[email hidden]$orig.ident %in% "E2", ]$tissue <- "Early-Tumors"
- [email hidden][[email hidden]$orig.ident %in% "E3", ]$tissue <- "Early-Tumors"
- [email hidden][[email hidden]$orig.ident %in% "L1", ]$tissue <- "Late-Tumors"
- [email hidden][[email hidden]$orig.ident %in% "L2", ]$tissue <- "Late-Tumors"
- [email hidden][[email hidden]$orig.ident %in% "L3", ]$tissue <- "Late-Tumors"
- #[email hidden][[email hidden]$orig.ident %in% "normal Brain", ]$tissue <- "normal-tissue"
- #Late_L2.merged[["RNA"]] <- split(Late_L2.merged[["RNA"]], f = Late_L2.merged$tissue)
- #Late_L2.merged
- table(Tumors.merged$orig.ident)
- ```
- ```{r}
- res <- 1.0
- ndims <- 20
- vars.reg <- c('nCount_RNA')
- Tumors.merged <- NormalizeData(Tumors.merged, normalization.method = "LogNormalize", scale.factor = 1000)
- Tumors.merged <- FindVariableFeatures(Tumors.merged, selection.method = "vst", nfeatures = 3000)
- hvg <- VariableFeatures(Tumors.merged)
- var_regex = 'Rik$|^mt|^Gm' # remove pseudo, predicted, mitochondria genes from clustering analysis
- hvg = grep(var_regex, hvg, invert = T, value=T)
- ```
- ```{r}
- Tumors.merged %<>%
- ScaleData(vars.to.regress = vars.reg) %>%
- RunPCA(features = hvg, npcs = 50) %>%
- FindNeighbors(dims = 1:ndims) %>%
- FindClusters(resolution = res) %>%
- RunUMAP(dims = 1:ndims, reduction = "pca", n.neighbors = 200)
- DimHeatmap(Tumors.merged, dims = 1:9, cells = 500, balanced = T)
- DimPlot(Tumors.merged, reduction = "umap", group.by = "orig.ident", label = TRUE, label.box = FALSE, raster = FALSE) +
- ggtitle("Tumors merged") +
- theme_bw(base_size = 10)
- Tumors.merged <- IntegrateLayers(object = Tumors.merged,
- method = RPCAIntegration,
- orig.reduction = "pca",
- new.reduction = "rpca",
- verbose = TRUE)
- Tumors.merged <- FindNeighbors(Tumors.merged, reduction = "rpca", dims = 1:20)
- Tumors.merged <- FindClusters(Tumors.merged, resolution = 1)
- Tumors.merged <- RunUMAP(Tumors.merged, reduction = "rpca", dims = 1:20, n.neighbors = 100)
- DimPlot(Tumors.merged, reduction = "umap", group.by = "tissue", label = TRUE, label.box = TRUE, raster = FALSE, pt.size = 0.5, alpha = 0.1, cols = c("#F8766D", "#00BF7D")) +
- ggtitle("") +
- theme_bw(base_size = 15)
- ```
- Feature Plots for OPC-like and glioma markers
- ```{r}
- library(viridis)
- FeaturePlot(Tumors.merged, features = c("Top2a"), reduction = "umap", label = FALSE, order = TRUE, pt.size = 0.5) &
- scale_colour_viridis(option = "magma")
- FeaturePlot(Tumors.merged, features = c("Myc"), reduction = "umap", label = FALSE, order = TRUE, pt.size = 0.5) &
- scale_colour_viridis(option = "magma")
- #FeaturePlot(Tumors.merged, features = c("Ppp1r14b"), reduction = "umap", label = FALSE, order = TRUE, pt.size = 1.0) &
- scale_colour_viridis(option = "magma")
- FeaturePlot(Tumors.merged, features = c("Sox2"), reduction = "umap", label = FALSE, order = TRUE, pt.size = 1.0) &
- scale_colour_viridis(option = "magma")
- ```
- Find Markers
- ```{r}
- Tumors.merged[["joined"]] <- JoinLayers(Tumors.merged[["RNA"]])
- DefaultAssay(Tumors.merged) <- "joined"
- markers_df <- FindAllMarkers(Tumors.merged,
- logfc.threshold = 0.1,
- min.pct = 0.01,
- only.pos = FALSE)
- ```
- Cell Annotation by Azimuth
- ```{r}
- library(future)
- library(Azimuth)
- plan("multicore", workers = 4)
- options(future.globals.maxSize = 8000 * 1024^4)
- Tumors.merged <- RunAzimuth(Tumors.merged, reference = "mousecortexref", )
- #Idents(Tumors.Tumors.merged) <- "predicted.subclass"
- DimPlot(Tumors.merged, group.by = "predicted.class", label = TRUE, label.box = TRUE) &
- ggtitle("Tumors.merged Neuron Annotation")
- DimPlot(Tumors.merged, group.by = "predicted.subclass", label = TRUE, label.box = FALSE) &
- ggtitle("Tumors.merged CNS Annotation")
- ```
- Module scoring
- ```{r}
- gene_sets <- read.csv("C:/Users/denni/OneDrive/Desktop/Frontiers Resubmission/bioinformatics work/Genesets/all_genesets.csv", na.strings = "none")
- for (x in 1:length(colnames(gene_sets))) {
- Tumors.merged <- AddModuleScore(Tumors.merged, assay = "joined", features = list(gene_sets[gene_sets[,x] != "", x]),name = colnames(gene_sets)[x])
- }
- FeaturePlot(Tumors.merged, features = c("OPC1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- FeaturePlot(Tumors.merged, features = c("OL1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- FeaturePlot(Tumors.merged, features = c("ASTROCYTE1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- FeaturePlot(Tumors.merged, features = c("MICROGLIA1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- FeaturePlot(Tumors.merged, features = c("ENDOTHELIAL1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- FeaturePlot(Tumors.merged, features = c("NEURON1"), reduction = "umap", split.by = "tissue", label = TRUE, order = TRUE, pt.size = 1.0)&
- scale_colour_gradientn(colours = rev(brewer.pal(n = 11, name = "RdYlBu")))
- ```
- Normal brain dataset
- ```{r}
- res <- 0.5
- ndims <- 20
- vars.reg <- c('nCount_RNA')
- nBrain_subset %<>%
- NormalizeData(normalization.method = "LogNormalize", scale.factor = 1000) %>%
- FindVariableFeatures(selection.method = "vst", nfeatures = 3000) %>%
- ScaleData(vars.to.regress = "nCount_RNA") %>%
- RunPCA(npcs = 50) %>%
- FindNeighbors(dims = 1:ndims) %>%
- FindClusters(resolution = res) %>%
- RunUMAP(dims = 1:ndims, reduction = "pca", n.neighbors = 200)
- gene_sets <- read.csv("C:/Users/denni/OneDrive/Desktop/Frontiers Resubmission/bioinformatics work/Genesets/all_genesets.csv", na.strings = "none")
- for (x in 1:length(colnames(gene_sets))) {
- nBrain_subset <- AddModuleScore(nBrain_subset, assay = "RNA", features = list(gene_sets[gene_sets[,x] != "", x]),name = colnames(gene_sets)[x])
- }
- library(viridis)
- DimPlot(nBrain_subset, reduction = "umap", label = TRUE, label.box = FALSE, raster = FALSE) +
- ggtitle("Normal Brain") +
- theme_bw(base_size = 10)
- ```
- Label metadata
- ```{r}
- [email hidden]$celltype <- "Neuron"
- [email hidden][[email hidden]$seurat_clusters == 1, ]$celltype <- "Oligo"
- [email hidden][[email hidden]$seurat_clusters == 2, ]$celltype <- "Astro"
- [email hidden][[email hidden]$seurat_clusters == 9, ]$celltype <- "Microglia"
- [email hidden][[email hidden]$seurat_clusters == 13, ]$celltype <- "OPC"
- [email hidden][[email hidden]$seurat_clusters == 15, ]$celltype <- "Endo"
- [email hidden][[email hidden]$seurat_clusters == 17, ]$celltype <- "Other"
- ```
- ```{r}
- library(pals)
- Glut_neurons <- rownames([email hidden][[email hidden]$predicted.subclass %in% c("L2/3 IT", "L5 ET", "L5 IT", "L5/6 NP", "L6 CT", "L6 IT", "L6 IT Car3","L6b"), ])
- GABA_neurons <- rownames([email hidden][[email hidden]$predicted.subclass %in% c("Lamp5", "Meis2", "Pvalb", "Sncg", "Sst", "Sst Chodl", "Vip"), ])
- [email hidden]$celltype <- [email hidden]$predicted.subclass
- [email hidden][Glut_neurons, ]$celltype <- "Glutamatergic Neuron"
- [email hidden][GABA_neurons, ]$celltype <- "GABAergic Neuron"
- [email hidden][rownames(filter([email hidden], predicted.subclass.score <= 0.75 & mapping.score <= 0.75 & OPC1 >= median([email hidden]$OPC1))), ]$celltype <- "OPC-like"
- DimPlot(nBrain_subset, reduction = "umap", group.by = "celltype", label = FALSE, label.box = FALSE, raster = FALSE) +
- ggtitle("Normal Brain") +
- theme_bw(base_size = 10) +
- scale_colour_manual(values = glasbey())
- ```
- ```{r}
- gene_sigs <- colnames([email hidden])[17:38]
- Glut_neurons <- rownames([email hidden][[email hidden]$predicted.subclass %in% c("L2/3 IT", "L5 ET", "L5 IT", "L5/6 NP", "L6 CT", "L6 IT", "L6 IT Car3","L6b"), ])
- GABA_neurons <- rownames([email hidden][[email hidden]$predicted.subclass %in% c("Lamp5", "Meis2", "Pvalb", "Sncg", "Sst", "Sst Chodl", "Vip"), ])
- [email hidden]$celltype <- [email hidden]$predicted.subclass
- [email hidden][Glut_neurons, ]$celltype <- "Glutamatergic Neuron"
- [email hidden][GABA_neurons, ]$celltype <- "GABAergic Neuron"
- [email hidden][rownames(filter([email hidden], predicted.subclass.score <= 0.75 & mapping.score <= 0.75 & OPC1 >= quantile([email hidden]$OPC1)[2])), ]$celltype <- "OPC-like"
- DimPlot(Tumors.merged, reduction = "umap", group.by = "celltype", label = TRUE, label.box = FALSE, raster = FALSE, pt.size = 1) +
- ggtitle("Tumors merged") +
- theme_bw(base_size = 10) +
- scale_colour_manual(values = glasbey())
- ```
celltype_analysis.Rmd at commit d8ef78d, no license · at the source
Overview
- Program in Molecular, Cellular and Developmental Biology at The Graduate Center of The City University of New, New York, NY, United States
- Neuroscience Initiative, Advance Science Research Center, Graduate Center of The City University of New York, New York, NY, United States
- Department of Pathology and Cell Biology, Columbia University Irving Medical Center, New York, NY, United States
Abstract
Gliomas are characterized by poor survival rate and limited options for treatment. Based on the transcriptional enrichment for oligodendrocyte progenitor cell (OPC) transcripts, the proneural glioma is thought to arise from transformation of OPCs. Here, we injected mutant BB-p53n OPCs (with Trp53 deletion and PDGF-BB overexpression) into recipient mice and performed single-nucleus RNA sequencing (snRNA-seq) of the injected cells and of brain tissue at early and late time points after injection, coincident with neuroimaging detection of tumoral masses. Analysis of tumor-bearing brain samples, identified a cluster that was not detected in the normal brain, but was enriched for OPC markers (Olig2), cell cycle genes (Myc) and glioma markers (Top2a, Sox2), which we named “OPC-like.” The clusters with “OPC-like” signature, were also the ones with greater genomic distribution of inferred copy number variations (inferCNVs) and high proliferative rate, and were therefore denoted as “tumors.” The inferCNV genomic load was higher in late-stage samples compared to early ones, indicative of progressive genomic instability. Immunohistochemical analysis validated the high proliferative rate and widespread expression of the “OPC-like” markers TOP2A and SOX2. Pseudotime analysis of cycling cells identified a trajectory of decreasing cell cycle checkpoint regulation and increasing synaptic signaling from early to late timepoints. Thus, the early timepoints were characterized by the emergence of highly proliferative cell clusters with a unique “OPC-like” transcriptional signature and inferCNVs, and the late timepoints were characterized by further genomic spreading of inferCNVs, loss of cell cycle checkpoints and transcriptional changes consistent with increased neuron-glioma interactions
Reproduced under the paper's license (CC BY), from the paper cited above.
Repository
Its files are read in the Code ↔ Paper reader above, with 4 matches between paragraphs and lines of code.
dennishuang02/bbp53n_glioma_submission
d8ef78dbc932c254ffc2e88a133b7dcc5d7dc785, 7 May 2026Availability: 1 check, the latest on 27 September 2026: the link answers
- 27 September 2026: the link answers
6 files
- celltype_analysis.Rmd, R, 321 lines, 2 matches
- diffExp.Rmd, R, 113 lines
- gsea.Rmd, R, 208 lines
- infercnv.Rmd, R, 149 lines, 1 match
- tricycle.Rmd, R, 232 lines, 1 match
- README.md, Text, 7 lines
The paper's code and data availability statement is in the Data section.
Tracing map
Proposed by the machine: these links were found in the paper and verified at the source, without human review. The map will receive a Zenodo DOI once one of the paper's authors has validated it with their ORCID.
What the map holds:
- 1 repository of the authors' code, each at its verified commit, with its license and how the link was found in the paper;
- 5 scripts, each with its path and the digest of its content;
- 4 matches between paragraphs of the paper and lines of the code (method lexical-v1);
- neither the text of the paper nor the code itself.
Its JSON (tracing-map.json) is deposited on Zenodo with its DOI once the map is validated.
Data
Datasets cited
- geo:GSE309333, at NCBI GEO; found in “Data availability statement”
Data availability statement
The datasets presented in this study can be found in online repositories. The names of the repository/
Reproduced under the paper's license (CC BY), from the paper cited above.
Versions
The history of this record: each version stored by the harvester or made by a correction of its authors or of the maintainers of its code, and what changed in its facts. The texts of the paper (its abstract, its availability statements) are not part of it; versions that changed only those are not listed.
Version 1, 27 September 2026: the first record
Recorded: type, language, journal, volume, pages, dates, 5 authors, 7 keywords, 2 funders, 52 references.
Cite
This paper
Huang, D., Mela, A., Park, H.-J., Canoll, P., & Casaccia, P. (2026). Single-nucleus transcriptomics identifies cell cycle and synaptic pathway dysregulation during OPC-to-glioma progression. Frontiers in cellular neuroscience, 20, 1713437. https://
BibTeX
@article{huang2026single
author = {Huang, Dennis and Mela, Angeliki and Park, Hye-Jin and Canoll, Peter and Casaccia, Patrizia},
title = {{Single-nucleus transcriptomics identifies cell cycle and synaptic pathway dysregulation during OPC-to-glioma progression}},
journal = {Frontiers in cellular neuroscience},
year = {2026},
month = jun,
volume = {20},
pages = {1713437},
publisher = {Frontiers Media SA},
issn = {1662-5102},
doi = {10.3389/
url = {https://
pmid = {42539873},
pmcid = {PMC13424661}
}
RIS
TY - JOUR
AU - Huang, Dennis
AU - Mela, Angeliki
AU - Park, Hye-Jin
AU - Canoll, Peter
AU - Casaccia, Patrizia
TI - Single-nucleus transcriptomics identifies cell cycle and synaptic pathway dysregulation during OPC-to-glioma progression
T2 - Frontiers in cellular neuroscience
J2 - Front Cell Neurosci
PY - 2026
DA - 2026/
VL - 20
SP - 1713437
SN - 1662-5102
PB - Frontiers Media SA
DO - 10.3389/
UR - https://
LA - en
ER -
CSL-JSON
{
"id": "10.3389/
"type": "article-journal",
"title": "Single-nucleus transcriptomics identifies cell cycle and synaptic pathway dysregulation during OPC-to-glioma progression",
"container-title": "Frontiers in cellular neuroscience",
"author": [
{
"family": "Huang",
"given": "Dennis"
},
{
"family": "Mela",
"given": "Angeliki"
},
{
"family": "Park",
"given": "Hye-Jin"
},
{
"family": "Canoll",
"given": "Peter"
},
{
"family": "Casaccia",
"given": "Patrizia"
}
],
"container-title-short":
"volume": "20",
"page": "1713437",
"DOI": "10.3389/
"PMID": "42539873",
"PMCID": "PMC13424661",
"ISSN": "1662-5102",
"publisher": "Frontiers Media SA",
"URL": "https://
"language": "en",
"issued": {
"date-parts": [
[
2026,
6,
30
]
]
}
}
The tracing map gets a citation of its own once an author has validated it and it has a DOI.
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