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Selection intensity for codon bias

D L Hartl1, E N Moriyama, S A Sawyer

  • 1Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138.

Genetics
|September 1, 1994
PubMed
Summary
This summary is machine-generated.

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Scientists analyzed codon bias in enteric bacteria using Poisson random field (PRF) theory. They found selection against disfavored codons is weaker than against disfavored amino acids, with unique constraints in early gene regions.

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • Synonymous codon usage bias (codon bias) is a nonrandom pattern observed in gene sequences.
  • Understanding the evolutionary forces driving codon bias is crucial for deciphering gene regulation and expression.

Purpose of the Study:

  • To analyze codon bias patterns in enteric bacteria.
  • To estimate the intensity of selection acting on synonymous codons.
  • To investigate selective constraints in different gene regions.

Main Methods:

  • Application of Poisson random field (PRF) theory to DNA sequence data.
  • Analysis of synonymous nucleotide and amino acid polymorphisms in Escherichia coli genes (gnd and putP).
  • Estimation of selection coefficients across 118 genes in E. coli and Salmonella typhimurium.

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Main Results:

  • The intensity of selection against disfavored synonymous codons is approximately 7.3 x 10(-9) in the gnd gene.
  • Selection against disfavored amino acids (2.0 x 10(-8)) is stronger than against synonymous codons but of a similar order of magnitude.
  • No significant difference in codon bias between conserved and replacement positions, suggesting translational misincorporation is not a major factor.
  • Greater codon bias in the first 100 codons, particularly for conserved amino acids with identical codons, indicating unique selective constraints like mRNA secondary structures.

Conclusions:

  • Selection acts on synonymous codon usage in enteric bacteria, albeit with lower intensity than on amino acid changes.
  • Translational misincorporation is unlikely to be a primary driver of codon bias in these bacteria.
  • Early coding regions of genes exhibit distinct selective pressures that influence codon bias, potentially involving mRNA secondary structures.