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A codon-based model designed to describe lentiviral evolution

A K Pedersen1, C Wiuf, F B Christiansen

  • 1Institute of Biological Sciences, University of Aarhus, Denmark. annemet@pop.bio.aau.dk

Molecular Biology and Evolution
|August 27, 1998
PubMed
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A new codon model explains lentiviral evolution by accounting for base composition and CpG dinucleotide selection. This model improves understanding of HIV1 gene patterns and evolution, highlighting CpG

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Virology

Background:

  • Lentiviral genes exhibit a deficit of CpG dinucleotides.
  • Understanding the evolutionary pressures shaping viral genomes is crucial.

Purpose of the Study:

  • To develop a codon-based model for lentiviral evolution.
  • To investigate the role of CpG dinucleotide selection in viral evolution.
  • To assess the impact of CpG depression on HIV1 sequence evolution.

Main Methods:

  • Developed a codon-based model incorporating base composition and CpG selection.
  • Extended the model to a pentet-based model to include neighboring bases.
  • Assessed model fit using pairwise alignments of HIV1 sequences.

Related Experiment Videos

Main Results:

  • The codon model largely explains codon usage patterns in HIV1 genes (gag, pol, env).
  • The pentet model highlights the importance of CpG depression across codon boundaries.
  • CpG depression significantly improves the model's description of observed HIV1 evolution.

Conclusions:

  • Selection against CpG dinucleotides contributes to nucleotide frequency biases in HIV1 genes.
  • CpG depression influences the ratio of CpG-generating to other substitutions.
  • Key evolutionary parameters like substitution rates are robust to CpG depression.