title: GSM2526511: siRNA_cid16Δcid12Δ; Schizosaccharomyces pombe; ncRNA-Seq
library_construction_protocol: Endogenous 3xFLAG-tagged Ago1-bound siRNA were purified by protein affinity purification and subsequent size selection on an 18% acrylamide gel. 2 pmol of a preadenylated 3' adaptor oligonucleotide (miRNA Cloning Linker-1 from IDT, 5'-App CTG TAG GCA CCA TCA AT/ddC/-3') were ligated in a 10 µl reaction with 5 U T4 RNA ligase (TaKaRa), ligation buffer without ATP and 5 U RNasin (Promega) at 20°C for 2 hours. The 3' ligated products were purified on an 18% acrylamide urea gel with subsequent phenol-chloroform purification and ethanol purification. The 5' adaptor ligation was performed in a 10 µl reaction with 2 pmol 5' adaptor oligonucleotide (5'-GUU CAG AGU UCU ACA GUC CGA CGA UC-3'), 5 U RNasin (Promega), 0.06 µg BSA, 5 U T4 RNA ligase (Thermo Scientific) and 1x ligation buffer with ATP (Thermo Scientific) for 2 h at 20°C. The ligated products were gel purified and reverse transcribed with 10 pmol primer (RT primer: 5'- GTG ACT GGA GTT CAG ACG TGT GCT CTT CCG ATC GAT TGA TGG TGC CTA CAG-3') and the SuperScript III First Strand Synthesis System (Thermo Scientific). The cDNA was PCR-amplified with Q5 High-Fidelity 2x Master Mix (NEB) for 14-20 cycles using the Illumina P5 5' primer (5' -AAT GAT ACG GCG ACC ACC GAG ATC TAC ACT CTT TCC CTA CAC GAC G -3') and the Illumina P7 3' primer with inserted barcode (5'-CAA GCA GAA GAC GGC ATA CGA GAT XXXXXX GTG ACT GGA GTT CAG ACG TG -3'). RNA libraries were prepared with NEBnext Ultra Directional RNA Library Prep Kit for Illumina (NEB); DNA library construction with NEBNext Ultra II DNA Library Prep Kit for Illumina kit (NEB). siRNA library: ligation of 3' adapter (5'-App CTG TAG GCA CCA TCA AT/ddC/-3') and 5' adapter (5'-GUU CAG AGU UCU ACA GUC CGA CGA UC-3'), reverse transcription, PCR of cDNA with Illumina P5 5' primer and barcoded llumina P7 3' primer.