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Codon context.

R H Buckingham1

  • 1URA 1139 du CNRS, Institut de Biologie Physico-Chimique, Paris, France.

Experientia
|December 1, 1990
PubMed
Summary

Coding sequences show nonrandom patterns in codon context, influenced by nucleotide doublets and wobble nucleotides. These patterns affect crucial protein synthesis processes, but their evolutionary impact remains unclear.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Nonrandomness in DNA sequences can arise from mutational biases and selection pressures.
  • Codon context, the surrounding nucleotide sequence of a codon, is known to influence gene expression.
  • Previous studies have identified nucleotide doublet preferences in both coding and non-coding DNA.

Purpose of the Study:

  • To investigate nonrandomness in the context of sense and stop codons within coding sequences.
  • To identify the factors contributing to this nonrandomness, including nucleotide doublet preference and relationships between successive codons.
  • To explore the potential impact of codon context on protein synthesis and its evolutionary implications.

Main Methods:

  • Analysis of coding sequences to identify patterns of nonrandomness.
  • Statistical examination of nucleotide doublet frequencies.
  • Assessment of relationships between wobble nucleotides of successive codons, controlling for other factors like codon usage.

Main Results:

  • Nonrandomness was observed in the context of both sense and stop codons.
  • Nucleotide doublet preference contributes to this nonrandomness, consistent with mutational dependencies.
  • A novel nonrandom context element involving wobble nucleotides of successive codons was identified, independent of doublet preference and codon usage bias.

Conclusions:

  • Codon context exhibits nonrandomness beyond simple nucleotide doublet preferences.
  • This nonrandom codon context influences key aspects of protein synthesis, including tRNA selection and termination.
  • The evolutionary drivers and consequences of nonrandom codon context in natural sequences require further investigation.

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