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Updated: May 17, 2025
Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Cryptosporidium modifies intestinal microvilli through an exported virulence factor
Elena Rodrigues1, Mitchell A Pallett1, Lorian C Straker2
1Cryptosporidiosis Laboratory, The Francis Crick Institute, London NW1 1AT, UK.
Abstract:
Cryptosporidium is a common intestinal infection of vertebrates and a significant threat to public health. Within the epithelial layer of the intestine, the parasite invades and replicates. Infected cells are readily detected under a microscope by the presence of elongated microvilli, particularly around the vacuole where the parasite resides. Here, we identify a family of Cryptosporidium virulence factors that are exported into the host cell during infection and localize to the microvilli. We examine the trafficking and function of the most highly expressed family member, Microvilli protein 1 (MVP1), which appears to control the elongation of microvilli through engagement of host EBP50 and CDC42. Remarkably, this mechanism closely mirrors that of an enteropathogenic Escherichia coli virulence factor, MAP, which is also known to drive host microvilli elongation during infection. This highlights a unique instance where eukaryotic and prokaryotic virulence factors have convergently evolved to modulate host actin structures through a similar mechanism.
Insights
Cryptosporidium virulence factors, like MVP1, are exported to host microvilli, driving elongation. This convergent evolution mirrors bacterial mechanisms, revealing a shared strategy for modulating host cell actin structures.
Area of Science:
- Molecular parasitology
- Host-pathogen interactions
- Cell biology
Background:
- Cryptosporidium is a significant enteric pathogen affecting vertebrates, posing a public health threat.
- Parasite invasion and replication occur within the intestinal epithelial layer.
- Infected cells exhibit characteristic elongated microvilli around the parasite's vacuole.
Purpose of the Study:
- To identify Cryptosporidium virulence factors exported into host cells.
- To investigate the function and mechanism of Microvilli protein 1 (MVP1) in modulating host microvilli.
- To explore the convergent evolution of virulence mechanisms between eukaryotic and prokaryotic pathogens.
Main Methods:
- Identification and characterization of Cryptosporidium virulence factors.
- Analysis of MVP1 trafficking and localization to host microvilli.
- Functional assays examining MVP1's interaction with host factors EBP50 and CDC42.
- Comparative analysis with enteropathogenic Escherichia coli virulence factor MAP.
Main Results:
- A family of Cryptosporidium virulence factors exported to host microvilli was identified.
- MVP1, a highly expressed member, was shown to control microvilli elongation via EBP50 and CDC42.
- The MVP1 mechanism closely parallels that of the E. coli virulence factor MAP.
Conclusions:
- Cryptosporidium utilizes exported virulence factors to manipulate host cell structures.
- MVP1 drives microvilli elongation by engaging host proteins EBP50 and CDC42.
- Eukaryotic (Cryptosporidium) and prokaryotic (E. coli) pathogens have convergently evolved similar mechanisms to modulate host actin dynamics.
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