Report

Polymorphic Secreted Kinases Are Key Virulence Factors in Toxoplasmosis

Science  15 Dec 2006:
Vol. 314, Issue 5806, pp. 1780-1783
DOI: 10.1126/science.1133690

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Abstract

The majority of known Toxoplasma gondii isolates from Europe and North America belong to three clonal lines that differ dramatically in their virulence, depending on the host. To identify the responsible genes, we mapped virulence in F1 progeny derived from crosses between type II and type III strains, which we introduced into mice. Five virulence (VIR) loci were thus identified, and for two of these, genetic complementation showed that a predicted protein kinase (ROP18 and ROP16, respectively) is the key molecule. Both are hypervariable rhoptry proteins that are secreted into the host cell upon invasion. These results suggest that secreted kinases unique to the Apicomplexa are crucial in the host-pathogen interaction.

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