Parasite Mutants
Parasite Mutants - Related Videos
14:56
A Genetic Screen to Isolate Toxoplasma gondii Host-cell Egress Mutants
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Cited by 18 •
2012
Forward genetics is a powerful method to unravel the molecular level of how Toxoplasma egresses from its host cell. Protocols are provided to chemically mutagenize parasites, enrich for mutants with defects in induced egress, and validate the phenotype of cloned mutants.
09:25
CRISPR/Cas9 Gene Editing to Make Conditional Mutants of Human Malaria Parasite P. falciparum
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Cited by 19 •
2018
We describe a method for generating glmS-based conditional knockdown mutants in Plasmodium falciparum using CRISPR/Cas9 genome editing.
13:39
Protocol for Production of a Genetic Cross of the Rodent Malaria Parasites
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Cited by 9 •
2011
Genetic crosses of rodent malaria parasites are performed by feeding two genetically distinct parasites to mosquitoes. Recombinant progeny are cloned from mouse blood after allowing mosquitoes to bite infected mice. This video shows how to produce genetic crosses of Plasmodium yoelii and is applicable to other rodent malaria parasites.
09:13
Understanding the Development of Compensatory Pathways in a Mutant Malaria Parasite Harbouring Hypomorphic Allele of Plant-Like Kinases
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2024
Chemical genetics involves the substitution of a gatekeeper residue with an amino acid containing a different side chain at the target locus. Here, we have generated a mutant parasite containing a hypomorphic allele of cdpk1 and identified compensatory pathways adopted by the parasite in the mutant background.
13:04
An Introduction to Parasitic Wasps of Drosophila and the Antiparasite Immune Response
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Cited by 41 •
2012
Parasitoid (parasitic) wasps constitute a major class of natural enemies of many insects including Drosophila melanogaster. We will introduce the techniques to propagate these parasites in Drosophila spp. and demonstrate how to analyze their effects on immune tissues of Drosophila larvae.
FAQs
Targeted genetic changes help link a parasite gene to a biological function by creating a variant in which that gene is modified, disrupted, or replaced. Researchers then compare the mutant with an unmodified parasite and examine differences in growth, survival, development, or infection. A consistent change supports a functional connection between the altered gene and the observed trait.
Spontaneous and targeted mutants answer different experimental questions. Spontaneous mutation reveals naturally arising genetic variation, whereas targeted manipulation lets researchers focus on a selected gene. The first approach can expose unexpected traits, while the second provides a more direct test of gene function. In both cases, comparing inherited traits and cellular effects with an unmodified parasite is essential.
Changes in growth, survival, development, or infection can indicate which parasite processes depend on the altered gene. Effects on infection help connect cellular function with host interaction, while altered survival or growth may point to roles in parasite maintenance. Examining several outcomes rather than one helps distinguish a broad defect from a trait-specific effect.
Mutants allow these disease-related traits to be examined through altered parasite behavior. If changing a gene modifies virulence, host invasion, response to a drug, or transmission, the gene becomes associated with that process and may represent a possible intervention point. This connects genetic evidence to host-pathogen biology and helps prioritize mechanisms for further study.
Researchers select a genetic change, generate or identify the corresponding parasite variant, and compare it with an unmodified counterpart. They then assess effects on growth, survival, development, or infection. Interpreting the difference requires keeping the genetic alteration in view: the measured phenotype is most informative when it can be linked to the changed gene rather than treated as an isolated observation.
They are useful when researchers need to connect parasite genes with disease-relevant traits or host-pathogen interactions. Studies may use them to investigate virulence, invasion, drug response, and transmission, or to evaluate genes relevant to vaccines and therapeutic targets. The same comparative logic also supports broader parasite biology by showing how inherited changes affect cellular functions and infection-related behavior.
By revealing parasite genes that influence survival, infection, drug response, or transmission, mutant studies can identify biological processes that matter for disease control. These findings may inform vaccine development, therapeutic target selection, and strategies aimed at limiting transmission. Their value comes from connecting a defined genetic change to an observable parasite or host-interaction outcome, rather than relying only on correlation.