A literature review identified DUSP4, HIF-1α, and COL8A2 as being linked to ERK signaling, and analysis of a published dataset of chromatin immunoprecipitation sequencing (ChIP-seq) data for Bmi1 in neural stem cells and glioblastoma cells identified Dusp4 as a direct Bmi1 target gene (Gargiulo et al., 2013). Here, COL8A2 is linked to glioblastoma.