Total RNA samples (2 µg) were arrayed into 96-well plates, and polyadenylated mRNA was purified with a MultiMACS mRNA isolation kit as per the manufacturer’s instructions. First-strand cDNA was synthesized using a SuperScript cDNA Synthesis kit with random hexamer primers. The SuperScript cDNA Synthesis protocol was used for second-strand cDNA synthesis. dTTP was replaced with dUTP in the dNTP mix which allowed the second strand to be digested with UNG (Uracil-N-Glycosylase, Life Technologies, USA) in the post-adapter ligation reaction. The cDNA was quantified and checked for quality before fragmentation. Plate-based libraries were created following the BC Cancer Agency’s Michael Smith Genome Sciences Centre (BCGSC) paired-end (PE) protocol36 (link). The libraries were sequenced using Illumina HiSeq 2000 or 2500, 2 × 100 PE lanes, with v3 chemistry and HiSeq Control Software version 2.0.10.
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