GSM2753035: input DNA; Homo sapiens; ChIP-Seq
Cells were fixed with 1% formaldehyde for 15 min and quenched with 0.125 M glycine.  Lysates were sonicated with a microtip sonicator to shear the DNA. Genomic DNA (Input) was prepared by treating aliquots of chromatin with RNase, proteinase K and heat for de-crosslinking, followed by ethanol precipitation. For each ChIP reaction, 30 ug of chromatin was precleared with protein G Dynabeads (Invitrogen). ChIP reaction was set up using precleared chromatin and antibody and incubated overnight at 4 C. Dynabeads were added and incubation at 4 C was continued for another 3 hr. Immune complexes were washed, eluted from the beads with SDS buffer, and subjected to RNase and proteinase K treatment. Crosslinks were reversed by incubation overnight at 65 C, and ChIP DNA was purified by DNA purification kit (Qiagen). Illumina sequencing libraries were prepared from the ChIP and Input DNAs by the standard consecutive enzymatic steps of end-polishing, dA-addition, and adaptor ligation. After a final PCR amplification step, the resulting DNA libraries were quantified and sequenced on NextSeq 500.