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Related Experiment Videos

Essential factors determining codon usage in ubiquitin genes.

K Mita1, S Ichimura, M Nenoi

  • 1Division of Biology, National Institute of Radiological Sciences, Chiba, Japan.

Journal of Molecular Evolution
|September 1, 1991
PubMed
Summary

Ubiquitin gene evolution shows conserved sequences reflect genome composition. Monoubiquitin and polyubiquitin genes exhibit distinct codon usage patterns, influenced by their genomic environment and evolutionary history.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Evolutionary Biology

Background:

  • Ubiquitin is a highly conserved protein found in all eukaryotes.
  • Ubiquitin genes exist as polyubiquitin (tandem repeats) and monoubiquitin forms.
  • Previous studies have noted extreme conservation in ubiquitin's amino acid sequence.

Purpose of the Study:

  • To analyze the nucleotide sequences of ubiquitin genes from multiple species.
  • To investigate the relationship between ubiquitin gene codon usage and overall genome composition.
  • To elucidate the molecular evolution of monoubiquitin and polyubiquitin genes.

Main Methods:

  • Compilation and analysis of nucleotide sequences from 13 ubiquitin genes across 11 species.
  • Correlation analysis of G+C content at the third codon position with genome-wide G+C content.

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  • Comparative analysis of codon usage patterns between monoubiquitin and polyubiquitin genes.

    • Main Results:

    • A positive linear correlation exists between the G+C content of ubiquitin gene codons and the host genome's G+C content.
    • Codon choices in ubiquitin genes reflect the average codon usage pattern of the species.
    • Monoubiquitin genes display a different codon usage pattern compared to polyubiquitin genes.

    Conclusions:

    • The G+C content of ubiquitin genes is influenced by AT/GC substitutions at the third codon position, reflecting genome composition.
    • Evolutionary divergence led to the formation of distinct monoubiquitin and polyubiquitin gene structures and expression patterns.
    • Environmental factors likely played a role in shaping the observed differences in codon choice and gene expression.