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Why do adaptive immune responses cross-react?

Karen J Fairlie-Clarke1, David M Shuker1, Andrea L Graham1

  • 1Institutes of Evolution, Immunology & Infection Research, School of Biological Sciences, University of Edinburgh, Ashworth Laboratories King's Buildings, Edinburgh, UK.

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Summary
This summary is machine-generated.

Immune system cross-reactivity, where antibodies target multiple pathogens, can offer broad protection. This study explores if this imprecision is a constraint or an evolutionary advantage, suggesting further interdisciplinary research.

Keywords:
heterologous immunityinformation processingoptimal discriminationoptimal immunology

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Area of Science:

  • Immunology
  • Evolutionary Biology
  • Vaccinology

Background:

  • Adaptive immune responses typically exhibit antigen specificity for host benefit.
  • Exceptions include cross-reactive antibodies providing protection against multiple pathogen species (e.g., flaviviruses, malaria).
  • Vaccinology seeks to leverage this cross-reactivity for broad-spectrum protection against evolving pathogens.

Purpose of the Study:

  • To investigate the proximate and evolutionary causes of immune response cross-reactivity.
  • To determine if cross-reactivity results from immune system information processing constraints.
  • To explore if intermediate cross-reactivity represents an evolutionary optimum.

Main Methods:

  • Exploration of theoretical explanations for immune cross-reactivity.
  • Consideration of information processing constraints within the immune system.
  • Analysis of evolutionary perspectives on immune system imprecision.

Main Results:

  • Cross-reactivity can arise from limitations in the immune system's ability to distinguish between diverse antigens.
  • An intermediate level of cross-reactivity may be evolutionarily advantageous, balancing specificity with breadth.
  • The study highlights the need for further research into the evolutionary ecology of information processing in immunology.

Conclusions:

  • Immune cross-reactivity presents a complex phenomenon with both potential drawbacks and significant benefits.
  • Understanding the evolutionary drivers of cross-reactivity is crucial for developing effective vaccines and therapies.
  • Interdisciplinary approaches, particularly integrating evolutionary ecology and immunology, are recommended for future research.