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Related Experiment Videos

The ambush hypothesis: hidden stop codons prevent off-frame gene reading.

Hervé Seligmann1, David D Pollock

  • 1Department of Biological Sciences, Biological Computation and Visualization Center, Louisiana State University, Baton Rouge, Louisiana 70803, USA. hselig@lsu.edu

DNA and Cell Biology
|December 9, 2004
PubMed
Summary

Hidden stops, or off-frame stop codons, prevent wasted energy and resources on nonfunctional proteins. These "ambush" stops are sometimes selected for, especially in species with unstable mitochondrial rRNAs.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Bioinformatics

Background:

  • Coding sequences naturally lack stop codons, but off-frame stop codons (hidden stops) exist in shifted reading frames.
  • These hidden stops can terminate nonfunctional, frame-shifted translation, potentially reducing cellular waste and avoiding harmful products.

Purpose of the Study:

  • To investigate the "ambush" hypothesis, proposing that hidden stops are sometimes selected for.
  • To explore the relationship between codon characteristics, mitochondrial genome features, and hidden stop prevalence.
  • To examine the correlation between ribosomal RNA secondary structure stability and hidden stop frequency in primate mitochondrial genomes.

Main Methods:

  • Analysis of codon usage and potential for hidden stop formation across amino acid combinations.

Related Experiment Videos

  • Comparative genomics of primate mitochondrial genomes to assess hidden stop distribution.
  • Correlation analysis between predicted mitochondrial rRNA secondary structure stability and hidden stop density.

    • Main Results:

    • In vertebrate mitochondria, 31.75% of amino acid combinations can form hidden stops.
    • Codons with higher hidden stop potential exhibit increased usage frequency and synonymous bias.
    • Primate mitochondrial genomes with less stable rRNAs show a negative correlation with hidden stop numbers, particularly for +1 frameshifts.

    Conclusions:

    • High hidden stop density appears to be an adaptation in species with slippage-prone ribosomes (unstable rRNAs), potentially compensating for reduced biosynthetic efficiency.
    • The findings support the ambush hypothesis and suggest potential biotechnological applications for controlling gene expression.