Figure 4. Correlation analysis and somatic mutation analysis of the two subtypes of GDRGs. The correlation heatmaps, which were generated to determine whether the observed GBM cell subsets could be identified using bulk RNA-seq data, demonstrated that the type I GDRGs were highly correlated in both scRNA-seq data (A) and bulk RNA-seq data, including the TCGA (B) and CGGA cohorts (C). The same result was observed for the type II GDRGs (A–C). The correlation analysis demonstrated that the expression of type I and type II metagenes was significantly correlated in both scRNA-seq data (D) and bulk RNA-seq data, including the TCGA (E) and CGGA cohorts (F). (G) OncoPlot analysis of the somatic mutation status of the GDRGs in the TCGA cohort revealed the top 9 mutated genes with mutation frequencies ≥ 5%. (H) Mutation frequencies of type I and type II GDRGs. A total of 246 genes (92.8%) were mutated in type I GDRGs, and 262 genes (89.4%) were mutated in type II GDRGs (P=0.183).