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Related Experiment Videos

Codon bias and mutability in HIV sequences.

C R Stephens1, H Waelbroeck

  • 1Instituto de Ciencias Nucleares, UNAM, Circuito Exterior, Apartado Postal 70-543, México D.F. 04510, México.

Journal of Molecular Evolution
|March 18, 1999
PubMed
Summary
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HIV env gene codon bias correlates with protein region mutability. This strategy balances immune response demands for amino acid changes with structural constraints, particularly in gp120 hypervariable regions.

Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • The human immunodeficiency virus (HIV) env gene encodes surface glycoproteins essential for viral entry.
  • Synonymous codon usage patterns can influence protein expression and evolution.
  • Understanding codon bias in HIV is crucial for comprehending viral adaptation and immune evasion.

Purpose of the Study:

  • To investigate the relationship between synonymous codon preference and regional mutability within the HIV env gene.
  • To explore how codon bias in specific protein regions, like gp120, relates to functional and structural constraints.

Main Methods:

  • Analysis of synonymous codon usage patterns across the HIV env gene.
  • Correlation of codon bias with predicted mutability requirements for different protein regions.

Related Experiment Videos

  • Examination of amino acid properties (hydrophobicity, volume) targeted by mutations in hypervariable regions.

    • Main Results:

    • A significant correlation was observed between codon bias and regional mutability requirements in the HIV env gene.
    • Hypervariable regions of gp120 exhibit a higher proportion of codons favoring nonsynonymous mutations.
    • These mutations often result in amino acid targets with similar hydrophobicity and volume, preserving protein structure.

    Conclusions:

    • The observed codon bias represents a viral strategy to balance immune pressure with structural integrity.
    • Selective pressures from the immune response favor amino acid substitutions in complementarity determining regions.
    • Negative selection against mutations disrupting env protein structure guides codon usage patterns.