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Autoregulation of YB-1 Synthesis in Cells.

Valeria S Kachan1, Irina A Eliseeva2, Andrey I Buyan2

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Biochemistry. Biokhimiia
|August 31, 2025
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Summary

Y-box binding protein 1 (YB-1) represses its own synthesis in human cells. Both 5' and 3' untranslated regions of YB-1 mRNA are involved in this autoregulation, resolving prior scientific debate.

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YB-1mRNAtranslation regulation

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Gene Regulation

Background:

  • Y-box binding protein 1 (YB-1) is vital for cell functions like transcription, translation, and DNA repair.
  • Controlling YB-1 levels is crucial for cellular homeostasis and stress adaptation.
  • YB-1 synthesis is regulated by transcription, mRNA translation, and protein stability.

Purpose of the Study:

  • To investigate the autoregulation of YB-1 mRNA translation in living human cells.
  • To resolve conflicting previous findings on the role of YB-1's untranslated regions (UTRs) in translation control.

Main Methods:

  • Metabolic protein labeling and immunoprecipitation to track YB-1 synthesis.
  • Reporter construct experiments to analyze UTR functions in translation.
  • Cultured human cell models.

Main Results:

  • Direct evidence confirming YB-1 represses its own translation in human cells.
  • Demonstrated that both the 5' UTR and 3' UTR of YB-1 mRNA contribute to autoregulation.
  • Resolved the contradiction in previous studies regarding UTR involvement.

Conclusions:

  • YB-1 autoregulation is a sophisticated mechanism involving both 5' and 3' UTRs of its mRNA.
  • This dual UTR involvement fine-tunes YB-1 synthesis, ensuring cellular homeostasis.
  • Provides the first direct evidence of YB-1 autorepression in a cellular context.