ChIP was performed as previously described {Guccione:2007dy}. Chromatin was fragmented using a BRANSON Digital Sonifier (#S540D) to 250-1000bp fragments, precleared and incubated with antibodies overnight. Antibody/chromatin complexes were incubated for 50% Protein-G Sepharose slurry and washed before elution/decrosslinking in 1% SDS and 0.1 M NaHCO3. DNA was column purified with QIAquick PCR purification Kit, Qiagen. ChIP DNA concentrations were measured with the Qubit dsDNA HS Assay kit (Thermo Fisher Scientific). Libraries were prepared with the NEBNext Ultra II DNA Library Preparation Kit for Illumina (NEB), following manufacturer's instructions. PCR conditions were adjusted to starting material concentrations and final elution volumes were reduced. Libraries were quantified by Bioanalyzer (High Sensitivity DNA Kit, Agilent) and PCR (KAPA Library Quantification Kit for Illumina, Roche). ChIP-Seq libraries were pooled and sequenced on the NextSeq500, as a single end (76bp) run