The role of RNA modifications in cancer translational control.

چکیده اصلی

RNA modifications have emerged as central regulators of cancer translational control. Unlike transcriptional reprogramming, which unfolds over hours, modification-dependent translational rewiring enables rapid proteomic adaptation to the nutrient-deprived, hypoxic, and immunologically hostile tumour microenvironment. Yet most existing reviews organize epitranscriptomic mechanisms by modification type or cancer hallmark, obscuring the mechanistic logic by which chemical marks collectively reshape the translational apparatus. This review adopts a translation-centric framework, examining how the most abundant modifications on mRNAs, tRNAs, and rRNAs regulate each stage of protein synthesis in malignant cells. We survey the epitranscriptomic toolkit, including modification chemistries, enzymatic writers, readers, and erasers, and detection technologies including nanopore direct RNA sequencing. We then trace how modifications control initiation (m6A-driven mRNA circularization, cap-independent translation via eIF3 and eIF4G2, rRNA 2'-O-methylation-directed cap-to-IRES switching), elongation (m6A-induced ribosome stalling coupled to mRNA decay, tRNA mcm5s2U-mediated codon-biased translation, YTHDF1-dependent elongation factor recruitment), and termination (pseudouridine-mediated stop codon readthrough, NMD evasion). Crucially, we show that mRNA, tRNA, and rRNA modifications do not act in isolation but form integrated networks. For example, mRNA m6A and tRNA mcm5s2U operate on opposing arms of the same regulatory axis, with direct implications for therapeutic design. We assess the expanding drug pipeline, from the METTL3 inhibitor STC-15 now in Phase 1b/2 trials and METTL3-targeting PROTACs to FTO and ADAR1 inhibitors, and argue that biology-informed combination strategies targeting multiple modification axes will be essential for durable clinical responses.

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