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Inducing Apical Periodontitis in Mice
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Where you start could determine where you end up.

Cecilia A Leber1, Hani S Zaher1

  • 1Department of Biology, Washington University in St Louis, St Louis, MO 63130, USA.

Trends in Cell Biology
|January 9, 2026
PubMed
Summary

Alternative start codon selection generates distinct N-terminal protein isoforms, enabling dual cellular compartment localization. This fundamental mechanism ensures proteins reach multiple destinations within eukaryotic cells.

Keywords:
alternative start-codon selectiondiseasedual localizationleaky scanningmislocalizationtranslational control of protein localization

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Eukaryotic proteins often require localization to various cellular compartments.
  • Producing protein isoforms with specific targeting sequences is essential for this multi-compartment localization.

Purpose of the Study:

  • To investigate the mechanisms underlying the generation of protein isoforms for dual cellular localization.
  • To identify the role of alternative start-codon selection in producing these isoforms.

Main Methods:

  • Analysis of translation initiation processes.
  • Identification and characterization of N-terminal protein isoforms.
  • Investigating the impact of alternative start codons on protein targeting.

Main Results:

  • Alternative start-codon selection is a widespread mechanism in eukaryotes.
  • This process generates distinct N-terminal isoforms of proteins.
  • These isoforms possess different cellular targeting sequences, facilitating dual localization.

Conclusions:

  • Alternative start-codon selection is a key strategy for achieving dual protein localization in eukaryotes.
  • This mechanism contributes significantly to the complexity and functional diversity of the proteome.