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Synonymous codon usage bias dependent on local nucleotide context in the class Deinococci.

Robert W Cutler1, Panuwan Chantawannakul

  • 1Bard College, Annandale-on-Hudson, New York, NY 12504, USA. cutler121@gmail.com

Journal of Molecular Evolution
|August 13, 2008
PubMed
Summary

Nucleotide context, not codon bias, drives mutation patterns in Deinococcus and Thermus genomes. This local nucleotide replacement influences synonymous codon usage, particularly in Deinococcus species.

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Area of Science:

  • Genomics
  • Molecular Evolution
  • Bioinformatics

Background:

  • Synonymous codon usage bias is a known evolutionary force.
  • Nucleotide context can influence mutation rates and patterns.
  • Understanding these patterns is crucial for deciphering genome evolution.

Purpose of the Study:

  • To investigate the role of local nucleotide context in shaping mutation patterns.
  • To differentiate between mutation bias and codon usage bias in specific bacterial genomes.
  • To analyze nucleotide co-occurrence patterns in Deinococcus and Thermus species.

Main Methods:

  • Examined nucleotide co-occurrence patterns in Deinococcus radiodurans, D. geothermalis, and Thermus thermophilus genomes.
  • Analyzed nucleotide replacement dependence on surrounding nucleotide context.
  • Investigated correlations between third codon sites and nucleotides up to six positions away.

Main Results:

  • Strong correlations found between third codon site nucleotides and nucleotides up to six positions away, dependent on purine/pyrimidine status.
  • Specific codon pair over-/under-abundance patterns observed in Deinococcus and Thermus, with deviations related to local nucleotide context.
  • Purine/pyrimidine symmetry in these patterns suggests nucleotide replacement, not codon bias, is the primary driver.

Conclusions:

  • A pervasive pattern of nucleotide replacement, dependent on local nucleotide context, has occurred in these species.
  • This process, rather than traditional codon bias, significantly influences synonymous codon usage.
  • Local nucleotide context shapes codon positioning and usage, particularly within the Deinococcus class.