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Strain-dependent host transcriptional responses to toxoplasma infection are largely conserved in mammalian and avian hosts

Ong, YC and Boyle, JP and Boothroyd, JC (2011) Strain-dependent host transcriptional responses to toxoplasma infection are largely conserved in mammalian and avian hosts. PLoS ONE, 6 (10).

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Toxoplasma gondii has a remarkable ability to infect an enormous variety of mammalian and avian species. Given this, it is surprising that three strains (Types I/II/III) account for the majority of isolates from Europe/North America. The selective pressures that have driven the emergence of these particular strains, however, remain enigmatic. We hypothesized that strain selection might be partially driven by adaptation of strains for mammalian versus avian hosts. To test this, we examine in vitro, strain-dependent host responses in fibroblasts of a representative avian host, the chicken (Gallus gallus). Using gene expression profiling of infected chicken embryonic fibroblasts and pathway analysis to assess host response, we show here that chicken cells respond with distinct transcriptional profiles upon infection with Type II versus III strains that are reminiscent of profiles observed in mammalian cells. To identify the parasite drivers of these differences, chicken fibroblasts were infected with individual F1 progeny of a Type II x III cross and host gene expression was assessed for each by microarray. QTL mapping of transcriptional differences suggested, and deletion strains confirmed, that, as in mammalian cells, the polymorphic rhoptry kinase ROP16 is the major driver of strain-specific responses. We originally hypothesized that comparing avian versus mammalian host response might reveal an inversion in parasite strain-dependent phenotypes; specifically, for polymorphic effectors like ROP16, we hypothesized that the allele with most activity in mammalian cells might be less active in avian cells. Instead, we found that activity of ROP16 alleles appears to be conserved across host species; moreover, additional parasite loci that were previously mapped for strain-specific effects on mammalian response showed similar strain-specific effects in chicken cells. These results indicate that if different hosts select for different parasite genotypes, the selection operates downstream of the signaling occurring during the beginning of the host's immune response. © 2011 Ong et al.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Ong, YC
Boyle, JPboylej@pitt.eduBOYLEJ0000-0003-0000-9243
Boothroyd, JC
ContributionContributors NameEmailPitt UsernameORCID
Date: 13 October 2011
Date Type: Publication
Journal or Publication Title: PLoS ONE
Volume: 6
Number: 10
DOI or Unique Handle: 10.1371/journal.pone.0026369
Refereed: Yes
MeSH Headings: Animals; Birds--genetics; Birds--parasitology; Chick Embryo--parasitology; Chromosomes--genetics; Databases, Genetic; Fibroblasts--metabolism; Fibroblasts--parasitology; Gene Expression Profiling; Gene Expression Regulation; Genome--genetics; Host-Pathogen Interactions--genetics; Humans; Male; Mammals--genetics; Mammals--parasitology; Quantitative Trait Loci--genetics; Software; Species Specificity; Toxoplasma--physiology; Toxoplasmosis--genetics; Toxoplasmosis--parasitology; Transcription, Genetic
Other ID: NLM PMC3192797
PubMed Central ID: PMC3192797
PubMed ID: 22022607
Date Deposited: 07 Sep 2012 21:12
Last Modified: 15 May 2019 03:55


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