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Related Experiment Videos

Context effects on misreading and suppression at UAG codons in human cells

M K Phillips-Jones1, L S Hill, J Atkinson

  • 1Krebs Institute for Biomolecular Science, University of Sheffield, United Kingdom.

Molecular and Cellular Biology
|December 1, 1995
PubMed
Summary

The 3' codon context significantly impacts nonsense suppression efficiency in mammalian cells. A cytosine (C) at the 3' position supports efficient suppression, while adenine (A) hinders it, differing from E. coli rules.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Nonsense suppression is a biological process where translation continues despite a premature stop codon.
  • The surrounding nucleotide sequence, or codon context, can influence the efficiency of this suppression.
  • Previous studies in bacteria suggested specific sequence preferences, but mammalian cell data was less clear.

Purpose of the Study:

  • To investigate the effect of the base 3' to the nonsense codon (UAG) on suppression efficiency in mammalian cells.
  • To compare the codon context rules for nonsense suppression between mammalian cells and Escherichia coli.

Main Methods:

  • Utilized a pRSVgal reporter vector with a UAG nonsense mutation (YA559) in the lacZ gene.
  • Employed site-directed mutagenesis to alter the base 3' to the UAG codon (A, C, G, or U).

Related Experiment Videos

  • Assessed suppression efficiency via cotransfection with suppressor tRNAs or treatment with the drug G418 in human (293, MRC5V1) and simian (COS-7) cell lines.

    • Main Results:

    • The rank order of efficiency for the 3' base was C < G = U < A.
    • A cytosine (C) at the 3' position strongly supported nonsense suppression.
    • An adenine (A) at the 3' position significantly hindered read-through of the nonsense codon.

    Conclusions:

    • Mammalian cells exhibit distinct codon context rules for nonsense suppression compared to E. coli.
    • The base immediately downstream of a nonsense codon plays a critical role in modulating suppression efficiency.
    • Findings provide insights into translational control mechanisms and potential therapeutic strategies involving nonsense suppression.