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Codon bias and plasticity in immunoglobulins

T B Kepler1

  • 1Department of Statistics, North Carolina State University, Raleigh 27695-8203, USA. kepler@unity.ncsu.edu

Molecular Biology and Evolution
|June 1, 1997
PubMed
Summary

Immunoglobulin genes evolve through germline changes and somatic hypermutation. This study reveals that codon bias in human immunoglobulin genes correlates with mutation patterns, enhancing immune system adaptability.

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Genetics

Background:

  • Immunoglobulin genes undergo both germline evolution and antigen-induced somatic hypermutation.
  • Somatic hypermutation increases antibody affinity and specificity but has a sequence-specific mechanism.
  • The sequence specificity of hypermutation presents an opportunity to direct mutations to specific gene regions.

Purpose of the Study:

  • To investigate whether site-specific codon bias in human immunoglobulin genes correlates with the sequence specificity of somatic hypermutation.
  • To determine if evolutionary processes have optimized immunoglobulin gene plasticity under somatic hypermutation.

Main Methods:

  • Analyzed a database of immunoglobulin intron sequences to determine the sequence specificity of the somatic mutation mechanism.
  • Analyzed human germline immunoglobulin V gene sequences to determine site-specific codon bias.
  • Performed statistical tests to correlate codon bias with mutation specificity.

Main Results:

  • Both statistical tests indicated a strong correlation between site-specific codon bias and the sequence specificity of somatic hypermutation.
  • Evidence suggests that evolution has acted to enhance the plasticity of immunoglobulin genes.

Conclusions:

  • Evolutionary mechanisms appear to enhance the adaptability of immunoglobulin genes by influencing codon bias in relation to somatic hypermutation.
  • This optimization likely improves the generation of beneficial antibody variants while minimizing detrimental mutations.

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