As an allosteric activator of METTL3 activity, METTL14, as an inactivated methyltransferase and allosteric activator of METTL3 activity, is involved in the development of various tumors. When METTL14 is mutated at cancer-associated sites, this reduces the catalytic activity and substrate specificity of the enzymes involved, leading to the reversal of methylation efficiency of consensus GGACU and non-consensus GGAUU sequences (decreased methylation at consensus sites and increased methylation at non-consensus sites), resulting in the occurrence of cancer [66, 69]. The gene discussed is METTL14; the disease is cancer.