YTHDF2 and obstructive sleep apnea syndrome: The severe OSA-related m6A regulators were obtained by the results of two algorithms overlapped (Figure 3D), and finally seven m6A regulators remained, including HNRNPA2B1, METTL3, KIAA1429, YTHDF2, FMR1, IGF2BP1 and IGF2BP3.