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Translational selection on codon usage in Xenopus laevis.

H Musto1, S Cruveiller, G D'Onofrio

  • 1Laboratorio di Evoluzione Molecolare, Stazione Zoologica Anton Dohrn, Naples, Italy.

Molecular Biology and Evolution
|August 16, 2001
PubMed
Summary
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Synonymous codon usage in Xenopus laevis is influenced by translational selection. Highly expressed genes preferentially use specific codons, correlating with base composition at the third codon position.

Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • Synonymous codon usage bias is observed across genomes.
  • Understanding codon usage can reveal evolutionary pressures and gene expression levels.

Purpose of the Study:

  • To investigate the factors influencing synonymous codon usage in Xenopus laevis.
  • To determine if translational selection impacts codon bias in this species.

Main Methods:

  • Correspondence analysis of codon usage patterns.
  • Analysis of third codon position base composition.
  • Validation of gene expression levels using Expressed Sequence Tag (EST) frequencies.

Main Results:

  • The first axis of correspondence analysis correlated with third codon position base composition.

Related Experiment Videos

  • The second axis distinguished highly expressed genes from others.
  • Statistically significant differences in codon frequency were found between highly expressed and other genes.

    • Conclusions:

    • Translational selection appears to be a significant factor shaping synonymous codon usage in Xenopus laevis.
    • Codon usage bias is linked to gene expression levels and base composition.