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Related Experiment Videos

Optimal defense strategy: storage vs. new production.

Emi Shudo1, Yoh Iwasa

  • 1Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan. shudo@bio-math10.biology.kyushu-u.ac.jp

Journal of Theoretical Biology
|November 7, 2002
PubMed
Summary

Hosts can optimize defense by balancing stored and newly produced proteins against pathogen infection costs. The best strategy depends on infection predictability and costs, shifting from production to storage as infection risk increases.

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Area of Science:

  • Theoretical Biology
  • Evolutionary Ecology
  • Host-Pathogen Dynamics

Background:

  • Host defense activation post-infection can be slow, taking hours to days.
  • Pre-producing and storing defense proteins offers a faster response but incurs energy costs and potential self-harm.
  • Balancing defense costs with pathogen-induced harm is crucial for host survival.

Purpose of the Study:

  • To determine the optimal host strategy for managing defense proteins.
  • To analyze the trade-offs between storing, activating, and producing defense proteins.
  • To identify how infection characteristics and costs influence defense strategy selection.

Main Methods:

  • Mathematical modeling of host-pathogen interactions.
  • Analysis of optimal control strategies for defense protein management.

Related Experiment Videos

  • Investigating the influence of parameters like infection size distribution, defense costs, and pathogen traits.

    • Main Results:

    • Optimal strategy minimizes total harm from pathogens and defense costs.
    • Hosts with predictable infection sizes activate all stored proteins.
    • Small expected infection sizes favor new production; large ones favor storage without new production.
    • The shift to a storage strategy is influenced by storage costs, activation costs, pathogen toxicity/growth, defense effectiveness, and infection likelihood.

    Conclusions:

    • Host defense strategies are dynamic, adapting to infection risk and associated costs.
    • Storage size is optimized based on infection magnitude, pathogen traits, and defense efficacy.
    • The optimal strategy balances immediate defense needs with long-term resource management.