title: GSM3067532: 3aKO H3K4me3_SpikeIn_ChIPSeq; Mus musculus; ChIP-Seq
library_construction_protocol: 2×10^6 cells were fixed for 10 minutes with 1% formaldehyde, followed by chromatin extraction and sonication to generate 200-500bp fragments. The sheared chromatin was incubated overnight at 4°C with H3K4me3 or H3K27me3 antibody. After incubation, 10 µl of Dynabeads Protein A magnetic beads previously washed in RIPA buffer was added, and samples were incubated for an additional 2 hours at 4°C. Bead-protein complexes were washed three times with RIPA buffer and twice with TE buffer. Genomic DNA was eluted for 2 hours at 68°C in 100 µl of Complete Elution Buffer (20 mM Tris, pH7.5, 5 mM EDTA, 50 mM NaCl, 1% SDS, 50 µg/ml proteinase K) and purified with MinElute PCR purification kit (Qiagen, 28004). For ChIP-Seq, sequencing libraries were prepared using ThruPLEX DNA-seq 48D kit (Rubicon Genomics, R400406) following standard protocols.