Reverse Genetic Screen
Reverse Genetic Screen - Related Videos
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...
02:46
Genetic Screens
0 Views •
2021
Genetic screens are tools used to identify genes and mutations responsible for phenotypes of interest. Genetic screens help identify individuals or a group of people at risk of developing genetic diseases and help them with early intervention, targeted therapy, and reproductive options. Forward genetic screens Forward or “classical” genetic screens involve creating random mutations in an organism’s DNA using radiation, mutagens, or insertion of additional bases, which result in visible changes...
13:48
Reverse Genetics Mediated Recovery of Infectious Murine Norovirus
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Cited by 24 •
2012
Noroviruses are a major cause of gastroenteritis yet molecular techniques for their characterisation are still relatively new. Here we report two different reverse genetics approaches for the efficient recovery of murine norovirus (MNV), the only member of this genus which can be propagated in cell culture.
06:59
A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis
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Cited by 6 •
2010
Gene function can be obscured in loss-of-function experiments if there is compensation by another gene. The zebrafish model provides a relatively high-throughput means to reveal such functional redundancy in living embryos.
08:10
Multi-enzyme Screening Using a High-throughput Genetic Enzyme Screening System
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Cited by 7 •
2016
This work presents a method of high-throughput screening using a universal genetic enzyme screening system that can be theoretically applied to over 200 enzymes. Here, the single screening system identifies three different enzymes (lipase, cellulase, and alkaline phosphatase) by simply changing the substrate used (p-nitrophenyl acetate, p-nitrophenyl-β-D-cellobioside, and phenyl phosphate).
FAQs
The connection comes from comparing a deliberately altered gene with an appropriate biological control under the same defined conditions. Researchers then measure a trait or process and determine whether the alteration produces a detectable change. A consistent phenotype after modifying the candidate gene provides evidence that the gene contributes to the observed biological function.
These interventions change gene activity in different ways. Disruption or suppression reduces or prevents the gene’s effect, whereas overexpression increases its activity; targeted editing can alter the sequence more precisely. Comparing the resulting phenotypes helps researchers distinguish effects associated with reduced gene function from those associated with increased activity.
Defined conditions make phenotype comparisons more interpretable because researchers can relate differences to the genetic alteration rather than uncontrolled changes in the environment. This is especially important when examining processes such as development, signaling, disease-related biology, or stress responses, where the observed effect may depend strongly on the conditions used for measurement.
Researchers first choose candidate genes linked to the biological question, select an intervention, and apply it in cells, tissues, or a model organism. They then maintain defined experimental conditions, measure the relevant phenotype, and compare altered samples with suitable controls. The resulting pattern helps prioritize genes for functional interpretation or further validation.
RNA interference, targeted mutagenesis, and CRISPR-based genome editing can provide ways to alter selected genes. The screen may be performed in cells, model organisms, or tissues, depending on the biological process being studied. Matching the intervention and experimental system to the research question allows phenotypes to be examined in an appropriate biological context.
These screens can test whether selected genes contribute to development, signaling, disease, or responses to stress. By linking a gene alteration with a measured phenotype, researchers can identify genes involved in a process and assess whether they merit additional study. The findings may also help validate potential targets for further biological or therapeutic research.