A 1–3 μg total RNA and m6A spike-in control mixture was added to 300 μL 1IP buffer (50 mM Tris-HCl, pH 7.4, 150 mM NaCl, 0.1% NP40, 40 U/μL RNase Inhibitor) containing 2 μg anti-m6A rabbit polyclonal antibody (Synaptic Systems). A 20 L Dynabeads™ M-280 Sheep Anti-Rabbit IgG suspension per sample was blocked with freshly prepared 0.5% BSA at 4 °C for 2 h, washed three times with 300 μL 1IP buffer, and re-suspended in the total RNA-antibody mixture prepared above. The RNA binding to the m6A-antibody beads was carried out with head-over-tail rotation at 4 °C for 2 h. The enriched RNA was eluted with 200 μL Elution buffer at 50 °C for 1 h, after which the co-precipitated RNA was isolated and qRT-PCR detection was performed on the RNA as the previously described. Sequences of the primers are listed in Additional file 1: Table S1.
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