Genomic DNA was extracted using the DNeasy Blood & Tissue Kit (Qiagen, 69506) according to the manufacturer’s instructions. For ChIP, transfected cells were subjected to chromatin immunoprecipitation (ChIP) with a commercially available kit ChIP-IT Express Enzymatic (53009-AF, ActivMotif, distributed by Nordic Biolabs) and an anti-HA tag antibody (C29F4, Cell Signaling) according to the manufacturer's instructions. Library Preparation was followed by DNA-end repair, 3'-dA overhang and ligation of sequencing adaptors, PCR amplification and size selection (100-300bp, including adaptor sequence).