Genetic Mutants
Genetic 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.
08:50
Genetic Screens
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2023
Genetic screens are critical tools for defining gene function and understanding gene interactions. Screens typically involve mutating genes and then assessing the affected organisms for phenotypes of interest. The process can be “forward”, where mutations are generated randomly to identify unknown genes responsible for the phenotypes, or it can be “reverse”, where specific genes are targeted for mutation to observe what phenotypes are produced.Here, JoVE reviews various types of genetic...
09:03
Forward Genetic Approaches in Chlamydia trachomatis
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Cited by 21 •
2013
We describe a methodology to perform genetic analysis in Chlamydia based on chemical mutagenesis and whole genome sequencing. In addition, a system for DNA exchange within infected cells is described that can be used for genetic mapping. This method may be broadly applicable to microbial systems lacking transformation systems and molecular genetic tools.
10:04
An Overview of Genetic Analysis
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2023
An organism’s physical traits, or phenotype, are a product of its genotype, which is the combination of alleles (gene variants) inherited from its parents. To varying degrees, genes interact with each other and environmental factors to generate traits. The distribution of alleles and traits within a population is influenced by a number of factors, including natural selection, migration, and random genetic drift.In this video, JoVE introduces some of the foundational discoveries in genetics,...
02:52
Expansion of Mutant Vaccinia Virus in Mammalian Cells
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2026
Source: Yuan, M., et al. A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors. J. Vis. Exp. (2016)This video demonstrates the expansion of plaque-derived recombinant virus in adherent mammalian cells. The virus carries a fluorescent reporter in place of a virulent gene, enabling infection tracking. Infected cells are harvested for PCR verification of the genetic modification.
FAQs
The outcome depends on what the genetic change alters: the DNA sequence itself, the level at which a gene is expressed, or the protein produced from that gene. A resulting phenotype may therefore reflect a change in cellular function rather than a general loss of viability. Examining the altered trait helps connect a specific genetic change with its biological role.
A genetically similar nonmutant control provides a reference for identifying effects associated with the mutation. Researchers can compare traits, cellular functions, or developmental outcomes between the two groups and then relate observed differences to the altered gene. This comparison supports more precise studies of gene function and helps distinguish mutation-associated phenotypes from features shared by both organisms or cells.
Mutants can expose how genes contribute to cellular functions, development, disease mechanisms, and adaptation. An altered phenotype may indicate that the affected gene participates in a particular biological process or pathway. By studying the relationship between the genetic change and the resulting outcome, researchers use mutants to investigate mechanisms that may be difficult to identify from normal organisms or cells alone.
They may arise spontaneously, after environmental exposure, or through experimental manipulation. The selected approach determines how researchers obtain organisms or cells carrying a change suitable for study. Afterward, investigators compare the mutants with genetically similar nonmutant controls and examine whether a detectable phenotype appears, allowing the genetic alteration to be evaluated in relation to the biological process of interest.
Researchers can look for detectable changes in traits, cellular functions, development, or other biological processes represented in the study. These outcomes provide evidence about how a gene influences the system being examined. In model-organism or cell-based experiments, the observed phenotype can guide analysis of gene function and help connect a genetic alteration with a broader biological pathway.
They are useful when researchers need to investigate gene function, model biological processes, or examine mechanisms related to disease and adaptation. Mutant organisms and cells can support model-organism research and help develop experimental strategies for studying pathways. Their value comes from linking an altered genetic state with measurable biological outcomes in a defined research context.