Dna Purification
Dna Purification - Related Videos
11:00
Genotyping of Plant and Animal Samples without Prior DNA Purification
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Cited by 14 •
2012
The Direct PCR approach presented here facilitates PCR amplification directly from small amounts of unpurified plant and animal tissue.
14:26
Genome-wide Purification of Extrachromosomal Circular DNA from Eukaryotic Cells
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Cited by 59 •
2016
This paper presents a sensitive method called Circle-Seq for purifying extrachromosomal circular DNA (eccDNA). The method encompasses column purification, removal of remaining linear chromosomal DNA, rolling-circle amplification and high-throughput sequencing. Circle-Seq is applicable to genome-scale screening of eukaryotic eccDNA and studying genome instability and copy-number variation.
11:25
A G-quadruplex DNA-affinity Approach for Purification of Enzymatically Active G4 Resolvase1
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Cited by 6 •
2017
G4 Resolvase1 binds to G-quadruplex (G4) structures with the tightest reported affinity for a G4-binding protein and represents the majority of the G4-DNA unwinding activity in HeLa cells. We describe a novel protocol that harnesses the affinity and ATP-dependent unwinding activity of G4-Resolvase1 to specifically purify catalytically active recombinant G4R1.
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.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
FAQs
High-salt conditions promote attachment of DNA to either a silica membrane or magnetic beads, allowing unwanted material to remain separate during subsequent washing. The clean-solution elution step then releases the captured DNA for downstream analysis. This binding-and-release behavior is the central chemical principle that makes the purification workflow selective rather than a simple cell extract.
Cell lysis is important because DNA must first be released from the original biological material before purification can separate it from proteins, lipids, salts, and other contaminants. Chemical or enzymatic treatments can contribute to that separation. If unwanted components remain with the recovered DNA, they may interfere with later molecular biology reactions and reduce confidence in the result.
The main outcome is not merely DNA recovery, but a template suitable for a specific analysis. Removing inhibitory contaminants supports polymerase chain reaction, restriction analysis, cloning, sequencing, and genotyping. Consequently, purification quality affects whether downstream measurements are accurate, sensitive, and reproducible, linking an upstream preparation step directly to the reliability of biological conclusions.
They provide two capture formats for the same general purification principle. Both are used under high-salt conditions to retain DNA while the sample is washed, after which DNA is eluted. The shared chemistry explains why protocols using these materials can follow a comparable overall logic, even though one uses a membrane and the other uses beads as the capture surface.
A typical workflow proceeds in a defined order: lyse the cells or sample, separate unwanted proteins, lipids, salts, and related material, capture DNA under high-salt conditions, wash the capture medium, and elute the DNA into a clean solution. Keeping these stages distinct helps produce a preparation ready for analysis.
The appropriate use of the preparation depends on the intended downstream assay. Purified DNA can serve as a template for amplification by polymerase chain reaction, evaluation with restriction analysis, insertion during cloning, sequence determination, or genotyping. In each case, the purification step supplies cleaner starting material so assay results are less vulnerable to contaminant-related interference.
In biology, DNA purification connects a biological sample to molecular measurements. Its value is especially apparent when the same type of analysis must be compared across samples, because consistent purification supports reproducibility. Reliable preparations can therefore strengthen interpretation of PCR, restriction, cloning, sequencing, or genotyping results without changing the biological question being tested.