Key Points
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Apicomplexa are eukaryotic parasites that cause important human and veterinary diseases, such as malaria, toxoplasmosis and cryptosporidiosis.
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Apicomplexa replicate within the cells of their hosts by highly flexible and adaptable mechanisms, which can generate thousands of progeny to spread the infection.
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The cell division of Apicomplexa occurs by closed mitosis of the nucleus and budding of daughter cells.
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The regulation of apicomplexan cell cycle progression occurs at a global level throughout the cytoplasm and at a local level for each individual nucleus. Control is exerted by the activity of regulatory kinases, by modulating transcription, translation and protein stability and by the presence of physical tethers.
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The apicomplexan nucleus is highly structured into defined nuclear territories. Centromeres and telomeres occupy defined positions, which are closely connected to the position of the centrosome to ensure genome and epigenome integrity during division.
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Daughter cells are assembled in a stepwise and highly ordered process that is temporally and spatially guided by cytoskeletal self-organization and that is physically linked to the centrosome.
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The centrosome emerges as a central regulatory location for the progression and completion of cell division in Apicomplexa.
Abstract
Toxoplasma gondii and Plasmodium falciparum are important human pathogens. These parasites and many of their apicomplexan relatives undergo a complex developmental process in the cells of their hosts, which includes genome replication, cell division and the assembly of new invasive stages. Apicomplexan cell cycle progression is both globally and locally regulated. Global regulation is carried out throughout the cytoplasm by diffusible factors that include cell cycle-specific kinases, cyclins and transcription factors. Local regulation acts on individual nuclei and daughter cells that are developing inside the mother cell. We propose that the centrosome is a master regulator that physically tethers cellular components and that provides spatial and temporal control of apicomplexan cell division.
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Acknowledgements
The authors thank M. White and J.-F. Dubremetz for many discussions. This work is supported by grants from the US National Institutes of Health to B.S. and M. White, M.E.F was supported by an EMBO short-term fellowship, and B.S. is a Georgia Research Alliance distinguished investigator.
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Glossary
- Apicomplexa
-
A phylum of single-celled eukaryotic pathogens that are related to dinoflagellates and ciliates.
- Centrosome
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The microtubule organizing centre of the mitotic spindle. It can contain a pair of centrioles as well as pericentriolar material.
- Centromeres
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The typically single locations on chromosomes where the kinetochore assembles. The kinetochore is the point of attachment for microtubules during mitosis. Centromeres are marked by the presence of a variant histone H3, known as CenH3 or CenPA.
- Telomeres
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The ends of linear chromosomes. They commonly consist of repetitive DNA and show chromatin modification that is associated with silencing.
- Endodyogeny
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The mode of replication that is used by Toxoplasma gondii. DNA replication is immediately followed by nuclear division and budding.
- Schizogony
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The mode of replication of Plasmodium falciparum. Multiple rounds of mitosis yield a multinucleated syncytium, which is followed by synchronous budding.
- Endopolygeny
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The mode of replication that is used by Sarcocystis neurona. Multiple rounds of mitosis without nuclear division, leading to a polyploid nucleus. Nuclear division coincides with budding.
- Syncytium
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A multinucleated cell that results from multiple rounds of mitosis in the absence of cytokinesis.
- Striated fibre
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A fibre that is formed by the polymerization of striated fibre assemblin (SFA) proteins. It organizes the flagellar rootlet in single-celled algae and budding in apicomplexan parasites.
- Inner membrane complex
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(IMC). A system of flattened membrane cisternae that underlie the plasma membrane of alveolates (ciliates, dinoflagellates and apicomplexans).
- Acylation
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A post-translational addition of a palmytoyl or myristoyl moiety. This is catalysed by an acyl-transferase, which controls the affinity of a protein for lipid membranes.
- Dense granules
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Secretory organelles of Apicomplexa that function in host cell modification.
- Rhoptries and micronemes
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Secretory organelles of apicomplexan parasites that function in motility and invasion.
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Francia, M., Striepen, B. Cell division in apicomplexan parasites. Nat Rev Microbiol 12, 125–136 (2014). https://doi.org/10.1038/nrmicro3184
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DOI: https://doi.org/10.1038/nrmicro3184
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