ChIP was performed as we have previously described 33 (link). The following antibodies were used to perform ChIP: anti-H3K27Me3 (Cell Signaling, Cat. No: 9733), anti-ARID1A (Santa Cruz, Cat. No: sc-32761), anti-BRG1 (Santa Cruz, Cat. No: sc-10768), anti-RNA polymerase II (Santa Cruz, Cat. No: sc-899) or anti-EZH2 (Cell Signaling, Cat. No: 5246). An isotype matched IgG was used as a negative control. ChIP DNA was analyzed by quantitative PCR against the promoter of the human PIK3IP1 gene using the following primers: Forward: 5’-CACATTGA-GCTGGTGTTTGTT-3’ and Reverse: 5’-CCATTGCCACTTCAAAGAGTTT-3’.