Preparation of miRNA libraries and sequencing was performed as described by Koppers-Lalic et al. [28 (link),29 (link)]. After RNA isolation, samples were adjusted to have the same amount of total RNA concentration (500 pg in 7 μL). Libraries were prepared using the standard small-RNA Library Prep Kit for Illumina. To assess samples’ quality before sequencing, the concentration of the samples was determined using the Fragment Analyzer and all samples met the quality requirements. Sequencing was performed using the HiSeq 4000 instrument (Illumina, San Diego, CA, USA) with 150 bp paired-ends.
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