Toxoplasma Uses GRA16 To Upregulate Host c-Myc
Michael W Panas1, John C Boothroyd2
1Department of Microbiology and Immunology, Stanford School of Medicine, Stanford, California, USA.
Msphere
|June 26, 2020
Summary
Toxoplasma gondii manipulates host cells by upregulating c-Myc. Researchers identified the dense granule protein GRA16 as the key effector responsible for this c-Myc upregulation, a crucial step in parasite-host interaction.
Area of Science:
- Cell Biology
- Parasitology
- Molecular Biology
Background:
- Intracellular pathogens manipulate host cells for survival.
- Toxoplasma gondii upregulates the oncogene c-Myc in host cells.
- The specific parasite effector responsible for c-Myc upregulation was unknown.
Purpose of the Study:
- To identify the effector protein responsible for Toxoplasma gondii-mediated c-Myc upregulation.
- To investigate the role of dense granule protein GRA16 in host cell reprogramming.
Main Methods:
- Screening for mutant parasites unable to upregulate host c-Myc.
- Expressing GRA16 in Neospora caninum to assess its function.
- Deleting the GRA16 gene in Toxoplasma gondii to observe the effect on c-Myc levels.
Main Results:
- A screen for c-Myc upregulation mutants identified components of a protein translocation complex but no specific effector.
- Expression of GRA16 in Neospora caninum conferred the ability to upregulate host c-Myc.
- Deletion of GRA16 in Toxoplasma gondii resulted in significantly reduced host c-Myc upregulation.
Conclusions:
- GRA16 is the central effector protein enabling Toxoplasma gondii to upregulate host c-Myc.
- This finding clarifies a key mechanism of host cell manipulation by T. gondii.
- GRA16's role in c-Myc regulation opens avenues for further research into parasite-host interactions.
