Preprint shows TRMT6/61A-mediated RNA methylation is required for human pre-tRNA processing

Researchers have posted a preprint to bioRxiv describing new mechanistic detail about how transfer RNAs (tRNAs) — the molecular adaptors that decode messenger RNA during protein synthesis — are protected from premature degradation in human cells. The study focuses on the enzyme complex TRMT6/61A, which deposits an N1-methyladenosine (m1A) modification at position 58 of tRNA molecules.

Using a dTAG rapid protein-depletion system that removes TRMT6/61A acutely rather than through conventional genetic knockout — avoiding long-term compensatory effects — the team show that loss of the enzyme rapidly reprogrammes the cellular complement of tRNAs. Their data indicate that TRMT6/61A acts on precursor tRNAs prior to their maturation, and that hypomethylated precursors are recognised and degraded by the exonuclease XRN2, a known RNA surveillance factor.

The findings add to understanding of how tRNA quality control operates in human cells. TRMT6/61A dysregulation has been linked to human diseases, making the mechanistic clarification of its role in pre-tRNA surveillance relevant to researchers studying RNA biology, epitranscriptomics, and the molecular basis of disease. The work has not been peer-reviewed. Educators and students covering RNA modification pathways and post-transcriptional regulation will also find the study relevant.