Murine Trp53-null tumor datasets. Sequencing and microarray technologies were used to produce four Trp53-null tumor datasets of varying sizes: (i) whole genome sequencing (n=12), (ii) exome sequencing (n=25), (iii) DNA copy-number microarray (n=43) and (iv) gene expression microarray (n=43). The intrinsic class of each sample is displayed on the dendrogram, with colored boxes being previously identified human subtype counterparts (Pfefferle et al., 2013). The hierarchical clustering location of each p53-null tumor within the datasets is displayed as a vertical black strip. *The Trp53-null transplant model produces heterogeneous tumors that primarily develop into one of these three murine expression subtypes. For each dataset, the number of tumors studied from each of the three murine classes highlighted by ‘*’ is displayed on the right-hand side of the figure.

Chromosome structural-variation analysis. Displayed are circos plots of the structural variants (SVs) enriched within (A) p53null-Basal^Ex, (B) p53null-Claudin-low^Ex and (C) p53null-Luminal^Ex tumors as determined by a two-class (class x versus all others) Fisher's exact test. The genes affected by these SVs are listed under each circos plot.

DNA copy-number analysis. Displayed in genomic order are the median class DNA copy-number levels for (A) p53null-Basal^Ex, (B) p53null-Claudin-low^Ex and (C) p53null-Luminal^Ex tumors. DNA copy-number changes enriched within each of the three Trp53-null transplant classes were identified using a two-class (class x versus all others) SAM analysis. Genomic regions of significant gain are labeled in red and regions of significant loss are labeled in green.

Conserved DNA aberrations with human basal-like tumors. Pearson correlations between DNA copy number and gene expression were determined for all genes within the significant regions of gain and loss from Fig. 4. Genes with a correlation greater than or equal to 0.5 are displayed in genomic order. The heatmap corresponds to DNA copy-number abundance. The percentage of human non-basal and human basal-like tumors affected by amplification or deletion of these genes is displayed. Human basal-like enriched events (indicated by ***) were determined using a two-class Fisher's exact test (P<0.05). CL, p53null-Claudin-low^Ex.