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Selection, mutations and codon usage in a bacterial model

F Bagnoli1, P Liò

  • 1Dipartimento di Matematica Applicata, Università di Firenze, Italy.

Journal of Theoretical Biology
|April 7, 1995
PubMed
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Bacterial evolution is modeled using codon usage and tRNA levels. Natural selection optimizes translation for highly expressed genes, balancing mutation effects.

Area of Science:

  • Evolutionary biology
  • Molecular biology
  • Statistical modeling

Background:

  • Codon usage bias is influenced by mutation and selection.
  • Transfer RNA (tRNA) abundance plays a role in translation efficiency.
  • Understanding these factors is key to bacterial evolution.

Purpose of the Study:

  • To develop a statistical model of bacterial evolution.
  • To investigate the interplay between codon usage and tRNA abundance.
  • To describe the evolutionary balance between mutation and selection.

Main Methods:

  • Statistical modeling of bacterial evolution.
  • Thermodynamical description of the model's asymptotic state.
  • Analysis of naturally occurring DNA sequences.

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Main Results:

  • A model coupling codon usage and tRNA abundance was developed.
  • The model shows a balance between mutation-driven homogenization and selection-driven translation improvement.
  • Natural selection significantly impacts codon bias in genes crucial for rapid growth.

Conclusions:

  • Codon bias is shaped by both mutational forces and natural selection.
  • Selection favors optimized codon usage in highly expressed genes.
  • The model provides insights into the evolutionary dynamics of bacterial genomes.