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Measuring immune selection.

D J Conway1, S D Polley

  • 1Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7HT. david.conway@lshtm.ac.uk

Parasitology
|March 8, 2003
PubMed
Summary
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Host immune responses shape pathogen evolution. Signatures of balancing selection in pathogen genes reveal immune evasion strategies and identify targets of protective immunity.

Area of Science:

  • Evolutionary biology
  • Immunology
  • Genetics

Background:

  • Host immune responses are crucial for defense against pathogens.
  • Pathogens that evade immune responses can survive and reproduce, with heritable traits conferring evasion being selected.
  • Vertebrate immune memory can favor pathogens with rare antigen alleles, maintaining genetic diversity.

Purpose of the Study:

  • To review methods for detecting genetic signatures of balancing selection in pathogen genes.
  • To discuss the utility of these methods in identifying pathogen antigens targeted by host immunity.

Main Methods:

  • Review of methodologies for identifying signatures of balancing selection in genetic sequences.
  • Analysis of the relationship between immune response targets and genetic polymorphism.

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Main Results:

  • Balancing selection leaves detectable genetic footprints in genes encoding pathogen antigens.
  • These genetic signatures can indicate which antigens are under pressure from host immune responses.

Conclusions:

  • Detecting balancing selection provides a powerful tool to understand host-pathogen coevolution.
  • This approach can identify specific pathogen antigens that are targets of protective host immunity, aiding in vaccine development.