ChIP assay was conducted as described previously50 (link), with SABiosciences Corporation’s ChampionChIP One-Day kit (Qiagen, Frederick, MD) following the manufacturer’s protocol. Chromatin from THP-1 cells were cross-linked, sonicated into an average size of ~500 bp, and then immunoprecipitated with antibodies against the N’-terminal of MLL (MLL-N), the C’-terminal of MLL (MLL-C), EZH2, SIN3A, H3K27Me3 or IgG (Abcam, Cambridge, MA). Purified DNA was amplified by real-time qPCR using primers targeting the promoter of ALOX5 as described before32 (link).
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