Rescue Plasmid Expression
Rescue Plasmid Expression - Related Videos
02:30
F Plasmid Transfer and Dual Antibiotic Selection in E. coli
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2025
Source: Erdogan, F.,et al., Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation. J. Vis. Exp. (2017)This video demonstrates the procedure for transferring an F plasmid from donor to recipient E. coli cells using a rescue plasmid and selecting transconjugants through dual antibiotic resistance. The process includes mixing bacterial cultures, incubation without shaking, disrupting mating pairs, and plating on selective media to confirm...
11:31
Generation of Recombinant Influenza Virus from Plasmid DNA
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Cited by 129 •
2010
Rescue of influenza A viruses from plasmid DNA is a basic and essential experimental technique that allows influenza researchers to generate recombinant viruses to study multiple aspects in the biology of influenza virus, and to be used as potential vectors or vaccines.
04:46
A Novel Rescue Technique for Difficult Intubation and Difficult Ventilation
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2011
We describe a technique to maintain oxygenation and ventilation using an endotracheal tube inserted nasally to the level of the naso-pharynx while sealing the mouth and nares for successful positive pressure ventilation.
04:38
A Novel Technique of Rescuing Capsulorhexis Radial Tear-out using a Cystotome
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Cited by 4 •
2011
Capsulorhexis is an important step in phacoemulsification surgery. A surgeon creates a continous curvilinear tear on the anterior lens capsule by controlling the tearing vector forces. A peripherally extended tear is a serious complication. This video demonstrates a novel technique of rescuing capsular radial tear out using a cystotome.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
FAQs
The promoter drives production of the introduced gene’s RNA, which supports synthesis of the encoded protein. Rescue therefore depends not only on delivering the plasmid but also on expression conditions that permit the relevant gene product to accumulate and function. If expression is unsuitable, failure to restore the phenotype may not demonstrate that the gene is unimportant.
Phenotype restoration provides a functional test of the candidate gene. If cells with a defective or absent gene recover the relevant biological trait after receiving a functional copy, the result supports a causal connection between gene activity and that trait. This logic helps separate a direct genetic effect from secondary changes that arise elsewhere in the cell.
Introducing a functional gene can test whether a mutation accounts for a cellular defect, while the same strategy can examine a regulatory pathway by asking whether restored gene activity reverses the associated phenotype. These experiments connect genotype to function and can support interpretation of engineered cellular or organismal models.
Researchers begin with cells that lack, silence, or carry a defective version of the gene, then introduce the plasmid through transfection or transformation. The plasmid promoter drives production of the encoded RNA and protein, after which investigators assess whether the biological phenotype is restored under suitable expression conditions. The outcome is interpreted against the original defect.
A convincing result requires expression conditions that allow the plasmid-encoded product to function in the relevant cells. The starting defect also matters: absence, silencing, or a defective gene may create different contexts for complementation. Interpreting phenotype recovery alongside that context helps researchers judge whether the observed change reflects restored gene activity rather than an unrelated secondary effect.
It is used in cell biology, genetics, disease modeling, and functional studies of engineered organisms. In these settings, researchers can use phenotype recovery to investigate gene function, evaluate mutations, or examine regulatory pathways. Its value is especially clear when a biological change must be connected to activity of a particular gene rather than described only as an association.