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Updated: Feb 13, 2026

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Functional analysis of human tRNA isodecoders.

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  • 1Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA.

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Transfer RNA (tRNA) isodecoders, despite sharing anticodons, show significant functional differences in stop-codon suppression. This study reveals that subtle sequence variations can dramatically alter tRNA efficiency, suggesting roles beyond standard translation.

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Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays
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Genome-wide Analysis of Aminoacylation Charging Levels of tRNA Using Microarrays

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Mammalian genomes contain numerous tRNA isodecoder genes, with over 270 identified in the human genome.
  • These isodecoders share anticodons but possess distinct body sequences, raising questions about functional divergence.
  • The functional variability of tRNA isodecoders remains largely unexplored.

Purpose of the Study:

  • To quantify the stop-codon suppression efficiency of human tRNA isodecoders.
  • To investigate the impact of sequence variations on tRNA functional efficiency.
  • To explore potential non-canonical roles of tRNA isodecoders.

Main Methods:

  • Developed a quantitative assay using a modified Green Fluorescent Protein (GFP) reporter gene with a UAG stop codon.
  • Co-transfected GFP constructs with various tRNA isodecoder genes (31 tested, including tRNASer, tRNALeu, and tRNAAla families) in human cell lines.
  • Measured GFP expression to determine tRNA suppression efficiency and assessed tRNA stability and aminoacylation in vivo.

Main Results:

  • Significant functional variation was observed among tRNA isodecoders, with suppression efficiencies differing up to 20-fold.
  • Subtle sequence modifications were sufficient to tune tRNA suppression efficiency, converting poor suppressors to potent ones.
  • Varying suppression efficiencies did not correlate with differences in tRNA stability or in vivo aminoacylation levels.

Conclusions:

  • Naturally occurring tRNA isodecoders exhibit substantial functional diversity in stop-codon suppression.
  • Sequence variations within tRNA isodecoders are critical determinants of their functional efficiency.
  • The observed functional heterogeneity suggests that some tRNA isodecoders may have roles beyond canonical protein translation.