Fig. 7. H3K9 hypermethylation in Zfp296-KO ESCs and binding of ZFP296 to G9a/GLP.
a Histone H3K9 methylation in the presence or absence of Zfp296 expression. Western blot analysis was performed for H3K9me1/2/3 and H3K27me3 using nuclear extracts from WT, KO #98, and Rescue #22 ESCs. The density of each band relative to that with anti-histone H3 antibody was measured. The level of each histone modification was expressed relative to that in WT ESCs. Data represent means ± SD of five (H3K9me1 and H3K27me3) or six (H3K9me2/3) independent experiments. *P < 0.05 vs. Rescue cells by Student’s t-test. Some of these western blot analyses are shown in the right panel. b Coimmunoprecipitation analysis of the interaction between ZFP296 and G9a (see Methods). Flag-ZFP296, its deletion mutants, or ZFP296-EGFP were coexpressed with Myc-G9a in 293 T cells. Nuclear extracts were immunoprecipitated with anti-Flag-tag antibody, followed by SDS-PAGE and western blotting. The membrane was treated with anti-Myc-tag antibody followed by anti-Flag-tag antibody treatment. c, d Coimmunoprecipitation analysis of the interaction between ZFP296 or its deletion mutant ΔZF4-6 and GLP or G9a. Nuclear extracts were immunoprecipitated with anti-Flag-tag or anti-Myc-tag antibody, followed by SDS-PAGE and western blotting. The membrane was treated with anti-Myc-tag antibody followed by anti-Flag-tag antibody treatment. Immunoprecipitation of Myc-G9a with anti-Myc-tag antibody appeared inefficient compared with that of Myc-GLP.
