The abstract is read at the publisher; the summary is JClub's.
A GCC-rich NAT1 upstream extension strongly enhances near-cognate non-AUG initiation in mammals, with key activity determined by -6 and -7 positions within the GCC repeat.
- Why it matters: Non-AUG translation expands proteome diversity, but how mammals regulate it under initiation fidelity constraints is unclear, limiting understanding of disease-linked translational programs.
- What they did: Using cell-free and reporter assays, the study tested how eIF1 and 5MP inhibit non-AUG initiation across mammals and plants, then mapped NAT1 motif determinants at -6 and -7 within GCC repeats.
- The result: Genome-wide human 5'UTR analyses show evolutionary depletion of NAT1-type non-AUG codons, yet over a hundred retained sites associate with genes in cell proliferation and migration, implying regulated non-AUG initiation under fidelity control.
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.