Figure 4

Histone signature at the MAGE-A1 promoter as examined by chromatin immunoprecipitation. DNA was derived from unstimulated (basal) MCF-7 cells, 5-aza-CdR- and/or TSA-stimulated MCF-7 cells and MCF-7 cells transfected with the expression plasmid encoding for BORIS. DNA-bound histones were immunoprecipitated by antibodies specific for methylated and acetylated histones, and amplified in a real-time PCR by a primer pair specific for the MAGE-A1 promoter. The background of the non-specific IgG immunoprecipitation was subtracted from the calculated ratio between the data derived from the histone-specific immunoprecipitation and input DNA. H3K9, Lysine 9 of histone H3; H4K8, Lysine 8 of histone H4; H3K4, Lysine 4 of histone H3; H4K20, Lysine 20 of histone H4; ac, acetylated; me, monomethylated; me2, dimethylated; me3, trimethylated. The significant p-values are shown.