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Gene expression differences underlying genotype-by-genotype specificity in a host-parasite system.

Seth M Barribeau1, Ben M Sadd, Louis du Plessis

  • 1Experimental Ecology, Institute of Integrative Biology, Eidgenössiche Technische Hochschule (ETH) Zürich, CH-8092 Zürich, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|February 20, 2014
PubMed
Summary

Host-parasite interactions involve more than just genetic differences. Gene expression variation also shapes host-parasite specificity, influencing immune responses and evolutionary dynamics in species like bumblebees.

Keywords:
Red Queencoevolutionmanipulation

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Area of Science:

  • Evolutionary biology
  • Immunology
  • Genomics

Background:

  • Host-parasite interactions drive evolutionary dynamics and population diversity.
  • Genotype-by-genotype (GH × GP) interactions are crucial, influenced by host susceptibility and parasite infectivity.
  • Previous research focused on genetic variation, overlooking gene expression's role.

Purpose of the Study:

  • To investigate the role of variable gene expression as a source of GH × GP interactions.
  • To analyze host-parasite matching in the bumblebee (Bombus terrestris) and trypanosome (Crithidia bombi) system.
  • To determine if gene expression patterns contribute to host-parasite specificity.

Main Methods:

  • Full-transcriptome sequencing of Bombus terrestris hosts.
  • Analysis of host gene expression in response to different Crithidia bombi genotypes.
  • Targeted expression assays to confirm transcriptome findings.

Main Results:

  • Different parasite genotypes induced distinct host expression responses.
  • Host genotypes varied in their response to specific parasite genotypes.
  • Successful parasite genotypes reduced host immune gene expression but increased expression of gene-controlling elements.
  • Poorly infecting parasite genotypes upregulated immunologically important genes, including antimicrobial peptides.
  • Gene expression was dependent on host genotype, parasite genotype, and their interaction.

Conclusions:

  • Variable gene expression, alongside genetic variation, generates GH × GP interactions.
  • Gene expression patterns contribute significantly to host-parasite specificity.
  • This finding expands our understanding of the molecular basis of host-parasite coevolution.