GSM6257770
6,000 viable cells were sorted into PBS/2% FCS and were stored in BambankerTM cell freezing media at -80°C. For bulk ATAC-seq, cells were thawed at 37°C. Subsequently, cells were lysed and tagmented in 1X TD Buffer, 0.2l TDE1 (Illumina), 0.01% digitonin, and 0.3X PBS at 37°C for 30 min at 300 rpm, as previously described [86]. DNA purification was performed with the MinElute PCR purification kit (QIAGEN). The complete eluate was pre-amplified with 5 PCR cycles using indexed primers with NEBNext High-Fidelity 2X PCR Master Mix (NEB) and the number of additional cycles was determined by SYBR Green quantitative PCR. After DNA purification, library quantification and quality control were performed with the Kapa Library Quantification Kit (Kapa Biosystems) and a Qubit dsDNA HS Assay kit (Invitrogen). Libraries were sequenced on an Illumina NextSeq 550 system with paired-end reads of 37 base pairs in length.