GSM5390940: ATAC-seq_Control_6h_Donor4; Homo sapiens; ATAC-seq
After stimulation, cells were harvested and washed twice with ice cold 1x PBS + 0.1% BSA and cell viability and concentration were measured with trypan blue on the TC20 Automated Cell Counter. For a detailed description of tagmentation protocols and buffer formulations refer to the SureCell ATAC-Seq Library Prep Kit User Guide (17004620, Bio-Rad). Harvested cells and tagmentation related buffers were chilled on ice. Lysis was performed simultaneously with tagmentation. Washed and pelleted cells were resuspended in Whole Cell Tagmentation Mix containing 0.1% Tween-20, 0.01% Digitonin, 1x PBS supplemented with 0.1% BSA, ATAC Tagmentation Buffer and ATAC Tagmentation Enzyme (ATAC Tagmentation Buffer and Enzyme are both included in the SureCell ATAC-Seq Library Prep Kit (17004620, Bio-Rad)). Cells were mixed and agitated on a ThermoMixer for 30 min at 37°C. Tagmented cells were kept on ice prior to encapsulation. Tagmented cells were loaded onto a ddSEQ Single-Cell Isolator. Single-cell ATAC-seq libraries were prepared using the SureCell ATAC-Seq Library Prep Kit (17004620, Bio-Rad) and SureCell ddSEQ Index Kit (12009360, Bio-Rad). Bead barcoding and sample indexing were performed in a C1000 Touch™ Thermal cycler with a 96-Deep Well Reaction Module: 37°C for 30 min, 85°C for 10 min, 72°C for 5 min, 98°C for 30 sec, 8 cycles of 98°C for 10 sec, 55°C for 30 sec, and 72°C for 60 sec, and a single 72°C extension for 5 min to finish. Emulsions were broken and products cleaned up using Ampure XP beads. Barcoded amplicons were further amplified using a C1000 Touch™ Thermal cycler with a 96-Deep Well Reaction Module: 98°C for 30 sec, 6-9 cycles (cycle number depending on the cell input, Section 4 Table 3 of the User Guide) of 98°C for 10 sec, 55°C for 30 sec, and 72°C for 60 sec, and a single 72°C extension for 5 min to finish. PCR products were purified using Ampure XP beads and quantified on an Agilent Bioanalyzer using the High-Sensitivity DNA kit. Libraries were loaded at 1.5 pM on a NextSeq 550 using the NextSeq High Output Kit and sequencing was performed using the following read protocol: Read 1 118 cycles, i7 index read 8 cycles, and Read 2 40 cycles. A custom sequencing primer is required for Read 1 (16005986, Bio-Rad; included in the kit).