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Minelute reaction cleanup

Manufactured by Qiagen

The MinElute Reaction Cleanup kit is a DNA purification system designed to efficiently remove unwanted reaction components such as salts, primers, and unincorporated nucleotides from enzymatic reactions. The kit utilizes a silica-based membrane technology to selectively bind and recover DNA fragments of 70 base pairs and larger.

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3 protocols using minelute reaction cleanup

1

Quantitative Analysis of Gene Expression and Chromatin Accessibility

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For RT-qPCR, total RNA was extracted and purified using the Quick-RNA MiniPrep Kit (Zymo Research). The quantity and quality of RNA was determined using a spectrophotometer. RNA was reverse transcribed using the High-Capacity RNA to cDNA Kit (Applied Biosystems) according to the manufacturer’s instructions. For ATAC-qPCR, cells were processed as described above for ATAC-Seq. For qPCR, nuclei were isolated from 50,000 cells and sequencing adapters were transposed for 30 min at 37 °C using 2.5 μl of TDE1 (Nextera Tn5 transposase, Illumina). The reaction was terminated and purified using MinElute reaction cleanup (Qiagen) and used as template. In both cases, qPCR was performed using 1 μl of 5 μM Powerup SYBR green PCR Master Mix (Applied Biosystems), 2 μl of dH2O and 2 μL of cDNA sample in a 10 μl reaction. Each measurement was carried out in a duplicate using a CFX384 Real-Time System (Bio-Rad). The PCR conditions were: 95 °C for 2 min, followed by 40 cycles of 95 °C for 15 s, and 60 °C for 60 s. For ATAC-qPCR, primers were designed to flank the center of the DAR as determined by ATAC-Seq. Primer sequences used are listed in Supplementary Table 2. Gene expression levels were normalized to β-actin, and accessibility changes were normalized to GAPDH.
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2

ATAC-seq protocol for chromatin accessibility

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ATAC-seq was generated according to Corces and colleagues (Corces et al., 2017 (link)) with some variations. In brief, 1,000 to 3,000 cells were sorted according to surface markers and DAPI into PBS 1% BSA in order to ensure viability. Cells were spun down at 500 x g for 10 minutes at 4°C, supernatant was removed and 20μl of complete transposition buffer (1ml Tn5, 10μl 2x TD buffer (Illumina), 0.01% digitonin, 0.3 x PBS) was carefully added to the invisible cell pellet. The transposition reaction was subsequently carried out at 37°C for 30 minutes on a Thermomixer at 700 rpm. DNA was purified using QIAGEN MinElute Reaction Cleanup and eluted in 20μl EB buffer. Libraries were amplified initially for 5 cycles and further amplification was adjusted to input material as assessed by qPCR. Libraries were cleaned up using AMPure XP beads (Beckman Coulter), double-sided size selection was performed by removing large fragments that precipitate with 0.5 x volume and purifying fragments that precipitate with 1.8 x volume ratio. Clean-up was done twice in order to efficiently remove primers and adaptor dimers. ATAC-seq libraries were sequenced at 75 million reads depth per sample, 100bp paired end on an Illumina NovaSeq platform.
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3

Quantitative gene expression and chromatin accessibility

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For RT-qPCR, total RNA was extracted and purified using the Quick-RNA MiniPrep Kit (Zymo Research).
The quantity and quality of RNA was determined using a spectrophotometer. RNA was reverse transcribed using the High Capacity RNA to cDNA Kit (Applied Biosystems) according to the manufacturer's instructions. For ATAC-qPCR, cells were processed as described above for ATAC-Seq. For qPCR, nuclei were isolated from 50,000 cells and sequencing adapters were transposed for 30 min at 37°C using 2.5 µL of TDE1 (Nextera Tn5 transposase, Illumina). The reaction was terminated and purified using MinElute reaction cleanup (Qiagen) and used as template. In both cases, qPCR was performed using 1 µL of 5 µM
Powerup SYBR green PCR Master Mix (Applied Biosystems), 2 µL of dH2O and 2 µL of cDNA sample in a 10 µL reaction. Each measurement was carried out in a duplicate using a CFX384 Real-Time System (Bio-Rad). The PCR conditions were: 95°C for 2 min, followed by 40 cycles of 95°C for 15 s, and 60°C for 60 s. Primer sequences used are listed in Supplementary Table S2. Gene expression levels were normalized to b-actin, and accessibility changes were normalized to GAPDH.
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