Additional file 1: Figure S1a. Hi-C million read counts (left) and read percentage (right) per cell line. Figure S2a. Venn diagram showing overlap of differentially expressed genes (abs(L2FC) > 0.32, p-value < 0.05) between three B-ALL cell lines upon knockdown, decreased and increased genes (left and right respectively). b. Volcano plots demonstrating differentially expressed genes (abs(L2FC) > 0.32, p-value < 0.05) highlighted by compartment switch or shift (A to more A, B to A, B to less B, or stable). c. Scatterplot demonstrating compartments colored by concordance score (percentage of genes with that compartment switch or shift that change in the same direction). Figure S3a. Rate of concordance calculations represent the amount of upregulated and downregulated genes (abs(L2FC) > 0.32, p-value < 0.05) that can be explained by compartment switches and shifts. Figure S4a. Barplot showing number of subcompartment calls with SNIPER for each cell line at NSD2 Low and NSD2 High. b. Barplots presenting fraction of Cscore compartment calls (A or B) overlapping SNIPER subcompartment calls (A1, A2, B1, B2, and B3) c. Barplot showing number of subcompartment calls with SNIPER for each cell line at NSD2 Low and NSD2 High excluding B1 subcompartment calls. d. Barplot presenting number of subcompartment switches from A to B and from B to A from NS2D Low to NSD2 High in each of the cell lines. e. Barplots presenting fraction of SNIPER subcompartment calls overlapping cscore compartment switches and shifts. Figure S5a. Correlation boxplots of SNIPER subcompartments and gene expression changes (abs(L2FC) > 0.32, p-value 0.05) for each cell line from NSD2 Low to NSD2 High. b. Volcano plots demonstrate differentially expressed genes (abs(L2FC) > 0.32, p-value < 0.05) highlighted by subcompartment switches and shifts. Figure S6a. PCA of ATAC-seq peaks for each cell line identifies three distinct clusters which are cell line-specific. b. Heat map representation of ATAC-seq results generated with DiffBind. c. Venn Diagram showing overlap of differentially accessible regions between three B-ALL cell lines decreased and increased accessibility (left and right respectively; (FDR < 0.01, abs(log2(fold change)) > 1). d. Example of B to A compartment shift shared by all three cell lines at the NEO1 locus showing concordance with gene expression and chromatin accessibility. e. Example of B to A compartment shift specific to RS4;11 cell line at t...