Toxoplasma gondii Strains Defective in Oral Transmission Are Also Defective in Developmental Stage Differentiation

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Toxoplasma gondii strains defective in oral transmission are also defective in developmental stage differentiation.

Toxoplasma gondii undergoes differentiation from rapidly growing tachyzoites to slowly growing bradyzoites during its life cycle in the intermediate host, and conversion can be induced in vitro by stress. Representative strains of the three clonal lineages showed equal capacity to differentiate into bradyzoites in vitro, as evidenced by induction of bradyzoite antigen 1, staining with Dolichos ...

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Distinct Strains of Toxoplasma gondii Feature Divergent Transcriptomes Regardless of Developmental Stage

Using high through-put RNA sequencing, we assayed the transcriptomes of three different strains of Toxoplasma gondii representing three common genotypes under both in vitro tachyzoite and in vitro bradyzoite-inducing alkaline stress culture conditions. Strikingly, the differences in transcriptional profiles between the strains, RH, PLK, and CTG, is much greater than differences between tachyzoi...

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A Toxoplasma gondii mutant defective in responding to calcium fluxes shows reduced in vivo pathogenicity.

Toxoplasma gondii is an important opportunistic pathogen in immunocompromised individuals. Successful propagation in an infected host by this obligate intracellular parasite depends on its ability to enter and exit host cells. Egress from the cell can be artificially induced by causing fluxes of calcium within the parasite with the use of calcium ionophores. While this ionophore-induced egress ...

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Dynamics of Toxoplasma gondii differentiation.

Parasite differentiation is commonly associated with transitions between complex life cycle stages and with long-term persistence in the host, and it is therefore critical for pathogenesis. In the protozoan parasite Toxoplasma gondii, interconversion between rapidly growing tachyzoites and latent encysted bradyzoites is accompanied by numerous morphological and metabolic adaptations. In order t...

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ژورنال

عنوان ژورنال: Infection and Immunity

سال: 2007

ISSN: 0019-9567,1098-5522

DOI: 10.1128/iai.00085-07