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Genotype-specific vs. cross-reactive host immunity against a macroparasite.

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Rainbow trout adaptive immunity shows cross-reactivity against diverse parasite genotypes. This finding suggests broader host defense mechanisms against multiple infections, impacting host-parasite evolution.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Immunology

Background:

  • Vertebrate hosts face simultaneous infections from multiple parasite genotypes.
  • Host immune responses can be genotype-specific or cross-reactive, influencing host defense and parasite evolution.
  • Evidence for these interactions outside mammalian systems is limited.

Purpose of the Study:

  • To investigate whether genotype-specific or cross-reactive immune responses dominate in rainbow trout against the eye fluke Diplostomum pseudospathaceum.
  • To determine if parasite genotype infection success is influenced by prior immunization genotype.

Main Methods:

  • Reciprocal immunization and re-exposure of rainbow trout (Oncorhynchus mykiss) with different genotypes of Diplostomum pseudospathaceum.
  • Measurement of parasite infection success post-re-exposure.

Main Results:

  • Parasite genotype infection success was independent of the immunization genotype.
  • Overall immunization reduced average parasite infection success by 31%.
  • The reduction in infection success was not greater for the initial immunization genotype, indicating cross-reactivity.

Conclusions:

  • The adaptive immune system of rainbow trout exhibits significant cross-reactivity against genetically diverse macroparasites.
  • Cross-reactivity may offer an advantage against varied parasite exposures.
  • Findings have implications for understanding host-parasite evolutionary dynamics and parasite strategies.