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Updated: Jun 25, 2026

Heuristic Mining of Hierarchical Genotypes and Accessory Genome Loci in Bacterial Populations
Published on: December 7, 2021
Host genetic architecture in single and multiple infections
K M Wegner1, C Berenos, P Schmid-Hempel
1Experimental Ecology, Institute of Integrative Biology, ETH Zürich Universitätstrasse, Zürich, Switzerland. mathias.wegner@env.ethz.ch
Understanding host resistance to parasite infections is crucial. This study reveals that while additive, dominance, and epistatic genetic components are key in single infections, maternal effects become decisive in multiple parasite strain infections.
Area of Science:
- Evolutionary Biology
- Genetics
- Host-Parasite Interactions
Background:
- Hosts frequently face simultaneous infections by diverse parasite strains.
- Interactions among parasite strains and with the host significantly influence parasite trait evolution.
- The genetic architecture of host resistance has been largely overlooked in multi-parasite scenarios.
Purpose of the Study:
- To investigate if the genetic architecture of host resistance differs between single and multiple parasite infections.
- To compare the genetic components of resistance in the red flour beetle (Tribolium castaneum) under different infection regimes.
Main Methods:
- Utilized joint scaling analysis to dissect genetic components of resistance.
- Compared resistance in Tribolium castaneum exposed to single and multiple strains of Nosema whitei.
Main Results:
- Additive, dominance, and epistatic genetic components were more significant in single infections.
- Maternal components played a decisive role in resistance during multiple infections.
- Parameter estimates for additive, dominance, and epistatic components showed positive correlations between single and multiple infections, while maternal components correlated negatively.
Conclusions:
- Host resistance specificity in parasite interactions may be mediated by genetic and epistatic components.
- Maternal effects appear to represent a more general form of host resistance, particularly relevant in multi-parasite infections.
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