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Related Experiment Videos

The major 5' determinant in stop codon read-through involves two adjacent adenines.

Sanaa Tork1, Isabelle Hatin, Jean-Pierre Rousset

  • 1CNRS UMR 8621, Institut de Génétique et Microbiologie, Université Paris-Sud, 91405 Orsay Cedex, France.

Nucleic Acids Research
|January 23, 2004
PubMed
Summary

Researchers identified key DNA sequences near stop codons that control translation read-through in yeast. These sequences, particularly the two nucleotides directly before the stop codon, significantly influence the efficiency of this process.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Yeast Research

Background:

  • Translational read-through is a mechanism where ribosomes bypass stop codons.
  • Understanding factors that regulate translational read-through is crucial for gene expression control.

Purpose of the Study:

  • To identify key sequence elements upstream of the stop codon that influence translational read-through efficiency in Saccharomyces cerevisiae.
  • To elucidate the mechanisms by which these elements modulate read-through.

Main Methods:

  • Construction of a degenerate oligonucleotide library targeting the six positions upstream of the stop codon.
  • Cloning the library into an ADE2 reporter gene system in yeast.
  • Quantification of translational read-through efficiency based on reporter gene expression.

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Main Results:

  • Sequence variations at the six positions upstream of the stop codon resulted in an approximate 16-fold modulation of translational read-through.
  • The two nucleotides immediately preceding the stop codon exerted the most significant influence on read-through efficiency.
  • The observed effects were independent of the C-terminal amino acid sequence or the identity of the tRNA in the ribosomal P site.

Conclusions:

  • mRNA structure, influenced by nucleotides in the ribosomal P site, is the primary 5' determinant of translational read-through efficiency.
  • This finding provides insights into the regulation of gene expression at the translational level in yeast.
  • The identified sequence elements could be utilized for engineering translational control in synthetic biology applications.