Toxoplasma gondii is a ubiquitous pathogen infecting an estimated one-third of the US population and 10-90 percent of individuals worldwide (depending on the country, various sociological and behavioral factors, etc). This parasite replicates intracellularly in a wide range of cell types and can persist for years in latent (tissue) cyst form. In addition to Toxoplasma, the protozoan phylum Apicomplexa includes many other parasites of clinical and/or veterinary importance. Although the diseases caused by these organisms differ greatly in nature (compare malaria, for example, with toxoplasmosis, or coccidiosis), the pathogenic impact of all apicomplexan parasites is ultimately attributable to proliferation, which makes understanding parasite replication an important goal. All Apicomplexana replicate by a distinctive process in which multiple daughters assemble simultaneously within the mother cell (termed 'schizogony'). This application proposes to explore the dynamics of parasite assembly in Toxoplasma, because (1) T. gondii normally forms only two parasites at a time, making studies on the morphology of replication much more tractable than in Plasmodium or Eimeria species, and (2) a wide range of cell biological and molecular genetic tools are now available for T. gondii. In particular, fluorescent protein reporters now permit virtually all known subcellular structures to be visualized in living parasites, and the efficiency of transient transfection permits rapid assessment of recombinant plasmid function (even for lethal transgenes). Imaging techniques permit the analysis of relationships between various subcellular organelles over time, using quantitative time-lapse video microscopy and image deconvolution, laser scanning confocal microscopy, fluorescence photobleaching and recovery, and laser ablation. Molecular genetic approaches permit the mutation of essentially any parasite gene by either random or targeted methods, and identification of the lesions responsible.
We aim to deterrnine the chronological order of critical events in T. gondii replication, the cause and effect relationships associated with these processes, and the molecular mechamsms involved.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI049301-02
Application #
6497397
Study Section
Special Emphasis Panel (ZRG1-VR (01))
Program Officer
Rogers, Martin J
Project Start
2001-02-15
Project End
2004-01-31
Budget Start
2002-02-01
Budget End
2003-01-31
Support Year
2
Fiscal Year
2002
Total Cost
$271,830
Indirect Cost
Name
University of Pennsylvania
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
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