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Related Experiment Videos

The relationship between palindrome avoidance and intragenic codon usage variations: a Monte Carlo study.

Anders Fuglsang1

  • 1Danish University of Pharmaceutical Sciences, Institute of Pharmacology, Copenhagen. anfu@dfh.dk

Biochemical and Biophysical Research Communications
|March 23, 2004
PubMed
Summary

Gene codon usage influences palindrome formation, with specific codon arrangements decreasing palindrome numbers. However, codon usage does not appear to control palindrome positions within genes. This impacts genome stability and evolution.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Codon usage, the selection of synonymous codons, varies within genes and is influenced by codon context and position.
  • Genomes often avoid palindromic sequences, which can pose stability risks.
  • The relationship between codon usage and the regulation of intragenic palindromes is not well understood.

Purpose of the Study:

  • To investigate whether intragenic variations in codon usage serve as a mechanism to control the quantity and location of palindromes within genes.
  • To determine if codon usage patterns actively reduce or manage palindromic sequences in genomes.

Main Methods:

  • A Monte Carlo algorithm was developed to resample codons within genes while preserving the original amino acid sequence.
  • Palindromes were quantified and their intragenic positions mapped in both native and resampled gene sequences.

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  • Analyses were conducted on Escherichia coli K12, bacteriophages, and endosymbionts (Buchnera sp. APS, Wigglesworthia sp.).

    • Main Results:

    • The number of palindromes in native genes was significantly lower than in resampled sequences, indicating codon usage decreases palindrome abundance.
    • The intragenic positions of palindromes in resampled sequences were similar to those in native genes, suggesting codon usage does not control palindrome location.
    • Similar results were observed in bacteriophages, while endosymbionts showed weaker evidence for codon usage controlling palindrome numbers.

    Conclusions:

    • Codon usage is a significant factor in reducing the overall number of palindromes within genes.
    • Codon usage does not appear to be a mechanism for controlling the intragenic positioning of palindromes.
    • The findings suggest a role for codon usage in genome stability, particularly in organisms with restriction-modification systems.