Not all tRNAs are equal: how isodecoder diversity shapes cancer.

Loss of the Arg-TCT-1 tRNA isodecoder is linked to lineage plasticity and resistance to androgen receptor pathway inhibitors in prostate cancer, via reduced translation of AGA-rich mRNAs.

• Why it matters: Different tRNAs that decode the same codon can show distinct levels and disease-linked behaviors, leaving unclear how isodecoder sequence differences shape cancer phenotypes.
• What they did: Kim and colleagues report that removing a single Arg-TCT isodecoder alters translation of AGA-rich mRNAs, promoting lineage plasticity and drug resistance in prostate cancer models.
• The result: Prior work links Arg-TCT-4 to neurodegeneration in mice and links increased Arg-TCT expression (especially Arg-TCT-4) to oncogenic transformation, suggesting isodecoder diversity may modulate tRNA processing, charging, elongation-factor interactions, ribosome engagement, or modifications.

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