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Related Experiment Video

Updated: Dec 29, 2025

Digital PCR-based Competitive Index for High-throughput Analysis of Fitness in Salmonella

Digital PCR-based Competitive Index for High-throughput Analysis of Fitness in Salmonella

Published on: May 13, 2019

Host heterogeneity mitigates virulence evolution.

P Signe White^1,2, Angela Choi¹, Rishika Pandey³

¹Department of Biology, College of Arts and Sciences, Emory University, Atlanta, GA 30322, USA.

Biology Letters

|January 30, 2020

Summary

Host genetic diversity hinders parasite adaptation. In experiments, the bacterial parasite Serratia marcescens showed reduced virulence evolution when exposed to heterogeneous host populations of Caenorhabditis elegans, unlike those in homogeneous environments.

Keywords:

Caenorhabditis elegans Serratia marcescens host heterogeneity monoculture parasite evolution virulence

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Last Updated: Dec 29, 2025

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Using Single-Worm Data to Quantify Heterogeneity in Caenorhabditis elegans-Bacterial Interactions

Using Single-Worm Data to Quantify Heterogeneity in Caenorhabditis elegans-Bacterial Interactions

Published on: July 22, 2022

Area of Science:

Evolutionary biology
Microbiology
Host-parasite interactions

Background:

Parasite evolution is influenced by host genetic diversity.
Host heterogeneity can reduce parasite prevalence and adaptation rates.
Trade-offs in parasite adaptation to specific host genotypes are known.

Purpose of the Study:

To investigate how host genetic heterogeneity affects parasite adaptation.
To measure the evolution of virulence in Serratia marcescens under different host population structures.
To understand the role of trade-offs in parasite evolution within diverse host environments.

Main Methods:

Experimental evolution of Serratia marcescens.
Exposure of parasites to either heterogeneous or homogeneous Caenorhabditis elegans populations.
Selection for increased parasite virulence over several hundred bacterial generations.

Main Results:

Parasites evolved significantly less virulence when exposed to heterogeneous host populations compared to homogeneous ones.
Host heterogeneity impeded the overall adaptation of parasite virulence.
Trade-offs were observed, with adaptation to one host genotype showing modest virulence increases against others.

Conclusions:

Host genetic heterogeneity acts as a barrier to parasite adaptation.
Reduced efficacy of selection and trade-offs contribute to impeded parasite evolution in diverse host populations.
Understanding host-parasite dynamics in heterogeneous environments is crucial for predicting parasite evolution.