HeLa Kyoto cells were cultured in Dulbecco's modified Eagle's medium (DMEM) supplemented with 10% fetal bovine serum (FBS) and 1% penicillin/streptomycin. siRNA transfections (for SLIC-CAGE and TIF-seq) were carried out using lipofectamine 2000 (Invitrogen) according to the manufacturer's protocol. Cells were treated with 20 nM siRNA for 4 days, including a re-transfection 2 days after the initial transfection. siRNA sequences: siGFP: GACGUAAACGGCCACAAGUdTdT; siRRP40: CACGCACAGUACUAGGUCAdTdT; siZCCHC8: GGAAUGUACCUCAGGAUAAdTdT; siZFC3H1: GAUUAGAGUCCAUGAUUAAdTdT. RNA was extracted using TRIzol (Invitrogen) and treated with TURBO DNase (Invitrogen) following the manufacturer's instructions.
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