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Evolutionary rates and expression level in Chlamydomonas.

Cristina E Popescu1, Tudor Borza, Joseph P Bielawski

  • 1Department of Biology, Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada.

Genetics
|December 20, 2005
PubMed
Summary

In Chlamydomonas reinhardtii, gene expression levels strongly correlate with evolutionary rates. Natural selection, rather than mutation, primarily drives this relationship in gene evolution.

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Area of Science:

  • Evolutionary Biology
  • Molecular Biology
  • Genomics

Background:

  • Synonymous and nonsynonymous nucleotide divergence rates are often negatively correlated with gene expression levels in many organisms, attributed to natural selection.
  • This relationship has not been extensively studied in important unicellular eukaryotes like Chlamydomonas reinhardtii.
  • Limited comparative protein-coding sequence data existed for Chlamydomonas reinhardtii and its relative Chlamydomonas incerta.

Purpose of the Study:

  • To investigate the correlation between gene expression levels and nucleotide divergence rates in Chlamydomonas.
  • To analyze comparative protein-coding sequences from Chlamydomonas reinhardtii and Chlamydomonas incerta.
  • To determine the relative contributions of natural selection and mutation to observed evolutionary rate variations.

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Main Methods:

  • Compiled and analyzed protein-coding sequences for 67 nuclear genes from Chlamydomonas reinhardtii and Chlamydomonas incerta.
  • Utilized EST databases from both species for sequence data.
  • Estimated gene expression levels using the codon adaptation index (CAI).

Main Results:

  • Compositional and synonymous codon usage biases were conserved between orthologous genes of the two species.
  • Significant variation in relative rates of synonymous and nonsynonymous substitution was observed across genes.
  • A strong negative correlation was found between gene expression levels (CAI) and substitution rates.
  • Comparative analysis of intron substitution rates indicated a larger role for natural selection than mutation.

Conclusions:

  • Natural selection significantly influences evolutionary rates in Chlamydomonas, particularly in relation to gene expression levels.
  • The study provides evidence for the impact of selection on genome evolution in this model organism.
  • Findings highlight the importance of considering gene expression in evolutionary analyses.