Pelleted cells and pulverized tissues were lysed in 100 µl 1% SDS lysis buffer and sonicated to 300-500bp using a Bioruptor (Diagenode). ChIPs were performed using the following antibodies: H3K4me3 (07-473, Millipore); H3K4me1 (ab8895, Abcam); H3K27ac (ab4729, Abcam); H3K36me3 (ab9050, Abcam); H3K27me3 (07-449, Millipore),EZH2 (# 5246, Cell Signaling) using same chromatin preparation.