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Related Experiment Videos

Correlation between Shine--Dalgarno sequence conservation and codon usage of bacterial genes.

H Sakai1, C Imamura, Y Osada

  • 1Laboratory for Bioinformatics, Keio University, 5322 Endo, Fujisawa, 252-8520, Japan.

Journal of Molecular Evolution
|March 7, 2001
PubMed
Summary

This study reveals a link between codon usage bias and Shine-Dalgarno sequence conservation in prokaryotes. Higher codon adaptation index (CAI) values correlate with more conserved SD sequences, impacting translation efficiency.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • Codon usage bias influences gene expression.
  • Shine-Dalgarno (SD) sequences are crucial for translation initiation in prokaryotes.
  • Understanding the relationship between codon bias and SD sequence conservation can elucidate translation regulation.

Purpose of the Study:

  • To investigate the correlation between codon usage bias and SD sequence conservation across nine prokaryotic genomes.
  • To determine if this correlation varies among different prokaryotic species.

Main Methods:

  • Calculated codon usage bias using the codon adaptation index (CAI).
  • Assessed SD sequence conservation by aligning predicted SD motifs with 5' untranslated region (5'UTR) sequences.
  • Analyzed complete genome sequences of nine prokaryotes.

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Main Results:

  • A clear correlation between CAI values and SD sequence conservation was observed in *Escherichia coli*, *Bacillus subtilis*, *Haemophilus influenzae*, *Archaeoglobus fulgidus*, *Methanobacterium thermoautotrophicum*, and *Methanococcus jannaschii*.
  • Genes with higher CAI values showed more conserved SD sequences in these organisms.
  • No significant relationship was found in *Mycoplasma genitalium*, *Mycoplasma pneumoniae*, and *Synechocystis*.

Conclusions:

  • Codon usage bias and SD sequence conservation are linked in many prokaryotes, suggesting a co-evolutionary relationship.
  • This correlation likely impacts translation initiation and overall translation efficiency.
  • Species-specific variations in this correlation highlight diverse regulatory strategies in prokaryotic gene expression.