Plasmid Dna Transformation
Plasmid Dna Transformation - Related Videos
07:46
Transformation of Plasmid DNA into E. coli Using the Heat Shock Method
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Cited by 433 •
2007
Transformation of plasmid DNA into E. coli using the heat shock method is a basic technique of molecular biology. It consists of inserting a foreign ...
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.
09:24
Purifying Plasmid DNA from Bacterial Colonies Using the Qiagen Miniprep Kit
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Cited by 23 •
2007
Plasmid DNA purification from E. coli is a core technique for molecular cloning. Small scale purification (miniprep) from less than 5 ml of bacterial ...
16:42
Generation of RNA/DNA Hybrids in Genomic DNA by Transformation using RNA-containing Oligonucleotides
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Cited by 4 •
2010
This work shows how to form an RNA/DNA hybrid at the chromosomal level and reveal transfer of genetic information from RNA to genomic DNA in yeast cells.
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 plasmid’s circular, extrachromosomal form lets it carry engineered genetic information separately from the cell’s main genetic material. After uptake, that information can be maintained sufficiently for plasmid propagation and used in experiments involving gene cloning, recombinant protein production, or testing how a gene affects cellular behavior.
These cell types provide alternative routes for plasmid uptake. Chemically competent cells receive the DNA through heat shock, whereas electrocompetent cells receive an electrical pulse. The distinction identifies the physical treatment used to promote DNA entry, while both approaches are followed by recovery and growth on selective medium.
The antibiotic-resistance marker provides a way to identify transformants after DNA uptake. Cells are placed on selective medium, where the marker distinguishes cells carrying the introduced plasmid from cells that did not acquire it. This selection step makes it possible to focus subsequent work on the relevant cell population.
A typical workflow combines plasmid DNA with competent bacterial cells, applies either heat shock or an electrical pulse, and then allows the cells to recover. The recovered cells are transferred to selective medium, where the antibiotic-resistance marker helps identify transformants for downstream plasmid propagation or experimentation.
Researchers use the method when they need to amplify engineered DNA or maintain a plasmid in bacterial cells. It supports gene cloning and plasmid propagation by introducing the selected construct into cells, followed by selection of transformants. The resulting cells provide a practical source for continuing molecular biology experiments.
Transformation enables researchers to introduce specific genes or regulatory sequences into cells and then examine how that genetic information affects cellular behavior. This makes the method useful for functional studies, because engineered plasmids provide a practical way to test genetic effects while also supporting recombinant protein production when appropriate.