Transcriptional response to MYC-ERTAM activation. A) Activation of MYC-ERTAM led to a significant change in expression of a large number of genes within only 4 hours for the pancreas (≥ 2-fold change, p ≤ 0.05). A similar transcriptional response was not detected until 8 hours post-MYC-ERTAM activation for SBK. B) Analysis of 6,633 genes, whose expression was altered within 8 hours upon activation of MYC-ERTAM in either pancreas or skin (green bars), identified enrichment of genes in a wide range of MYC-mediated functions. Analyses of genes whose expression was altered greater than 2-fold within 8 hours for the SBK (red bars) and the pancreatic β-cells (blue bars) showed a similar level of response to MYC-ERTAM activation in both tissues within 8 hours, with a slight increase in the level of response for the pancreas as compared to the skin, in particular for DNA-replication and response to DNA-damage. p-values represent significance of enrichment of GO classes for the 6,633 genes. C) Genes identified as showing significant differential expression due to the joint effects of MYC-ERTAM activation and tissue (with or without an interaction with the time point) were clustered to identify functionally related genes (red, up-regulated; black, no change; green, down-regulated). The blow-up identifies a group of functionally related genes showing increased expression in SBK but not islet β-cells.