title: GSM5287981: ATAC-seq_MCF7-DR_1; Homo sapiens; ATAC-seq
library_construction_protocol: Total RNA was isolated from samples using TRIzol Reagent (Invitrogen, USA) and purified using RNeasy Mini Kit (QIAGEN, Germany). Agilent Bioanalyzer 2100 was used to assess RNA integrity. The RNA‐seq library preparation from 1 μg of total RNA was performed with TruSeq RNA Sample Prep Kit (Illumina, USA) according to the manufacturer's instructions. PE150 sequencing was performed on the Illumina HiSeq X Ten platform (Novogene Biotech, China). The ATAC-seq libraries were prepared using a total of 50,000 fresh cells were washed twice with 100 μl of cold PBS (KEL Biotech, China) and resuspended in 100 μl of lysis buffer [10 mM Tris-HCl (pH 7.4), 10 mM NaCl, 0.1% IGEPAL CA-630 (Sigma-Aldrich) and 3 mM MgCl2] for 10 min on ice to prepare the nuclei. Immediately after lysis, the suspension of nuclei was spun at 500 g at 4°C for 5 min to remove the supernatant. Nuclei were then incubated with the 50 μl of Tn5 transposition reaction mix (DIATRE Biotech, China) at 37 °C for 30 min. The stop buffer was then added directly into the reaction to end the tagmentation. DNA was purified using the QIAquick PCR Purification Kit (QIAGEN, Germany). PCR was performed to amplify the library for 12 cycles. Libraries were purified with Agencourt Ampure XP beads (Beckman, USA) to remove contaminating primer dimmers.