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Toxoplasmosis

Toxoplasmosis

Toxoplasmosis, a zoonotic disease caused by the protozoan Toxoplasma gondii, poses significant public health challenges globally due to its high seroprevalence and varied clinical manifestations. As an obligate intracellular parasite, T. gondii can infect all warm-blooded vertebrates, but felids are its only definitive hosts, shedding unsporulated oocysts into the environment. Humans typically acquire the infection through ingestion of tissue cysts in undercooked meat or oocysts from...

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Toxoplasma gondii Cyst Wall Formation in Activated Bone Marrow-derived Macrophages and Bradyzoite Conditions

Toxoplasma gondii Cyst Wall Formation in Activated Bone Marrow-derived Macrophages and Bradyzoite Conditions

Published on: August 12, 2010

Restriction Checkpoint Controls Bradyzoite Development in Toxoplasma gondii.

Anatoli V Naumov¹, Chengqi Wang², Dale Chaput³

¹Department of Internal Medicine, Division of Infectious Diseases and International Medicine, Morsani College of Medicine, University of South Floridagrid.170693.a, Tampa, Florida, USA.

Microbiology Spectrum

|June 2, 2022

Summary

Researchers discovered a cell cycle switch in Toxoplasma gondii, controlled by atypical cyclins, that regulates the transition between rapid growth and chronic infection stages. This finding offers new drug targets against this human pathogen.

Keywords:

Toxoplasma gondii apicomplexan bradyzoite cyclin cyclin-dependent kinase development

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Published on: March 12, 2015

Area of Science:

Parasitology
Cell Biology
Molecular Biology

Background:

Toxoplasma gondii causes human toxoplasmosis, with tachyzoites driving acute disease and bradyzoites causing chronic infections.
Understanding the parasite's cell cycle control is crucial for developing new therapies against chronic and drug-resistant stages.

Purpose of the Study:

To identify the cell cycle mechanism regulating the switch between Toxoplasma gondii growth and differentiation.
To characterize the roles of specific cyclins in parasite development and replication.

Main Methods:

Investigated the G1 restriction checkpoint (R-point) in T. gondii.
Utilized conditional knockdown models and gene expression analyses.
Examined cyclin-TgCycP1, TgCycP2, and TgCyc5 interactions with TgCrk2 kinase.

Main Results:

Identified a T. gondii R-point network involving TgCrk2 kinase and atypical cyclins (TgCycP1, TgCycP2, TgCyc5).
TgCycP1 promotes rapid RH tachyzoite growth and inhibits differentiation.
TgCycP2 regulates G1 duration in ME49 tachyzoites and bradyzoite replication; TgCyc5 is vital for tissue cyst maturation.

Conclusions:

The T. gondii R-point network, composed of TgCrk2 and atypical cyclins, controls parasite growth and differentiation.
TgCycP1, TgCycP2, and TgCyc5 have distinct roles in parasite development.
This parasite-specific network presents potential drug targets for treating toxoplasmosis.