Viral Dna Quantification
Viral Dna Quantification - Related Videos
12:45
Preparation of Viral DNA from Nucleocapsids
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Cited by 40 •
2011
We describe the process of isolating high purity herpesvirus nucleocapsid DNA from infected cells. The final DNA captured from solution is of high concentration and purity, making it ideally suited for high-throughput sequencing, high fidelity PCR reactions, and transfections to produce new viral recombinants.
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
13:46
Separation of Single-stranded DNA, Double-stranded DNA and RNA from an Environmental Viral Community Using Hydroxyapatite Chromatography
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Cited by 5 •
2011
We describe an efficient method to separate single-stranded DNA, double-stranded DNA and RNA molecules from environmental viral communities. Nucleic acids are fractionated using hydroxyapatite chromatography with increasing concentrations of phosphate-containing buffers. This method permits the isolation of all viral nucleic acid types from environmental samples.
02:31
Sample Preparation for Luciferase-Based Viral Quantification
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2026
Source: Garcia, V., et al. High-throughput Titration of Luciferase-expressing Recombinant Viruses. J. Vis. Exp. (91), e51890, doi:10.3791/51890 (2014).This video demonstrates the preparation of cell culture samples to assess viral load using a luciferase-based assay. It outlines the process of infecting epithelial cells with a genetically modified virus, transferring viral supernatants and standards into assay wells, and promoting viral entry through centrifugation and incubation. The...
06:00
HCR-DNA FISH: A Fluorescence In Situ Hybridization Technique to Detect Viral DNA in Infected Cells
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2023
In this video, the cells infected with MCPyV virions were subjected to in situ hybridization chain reaction to detect MCPyV specific genomes. Further, the DNA-HCR technique was combined with FISH to visualize the MCPyV DNA in infected human skin cells.
FAQs
The sequence is essential because each stage prepares the DNA for the next one. During denaturation, the DNA strands separate; primer annealing then positions primers on the target; extension allows new DNA to be synthesized. Repeating this sequence creates progressively more target product, while fluorescence monitoring links amplification progress to the quantitative measurement.
Fluorescence acts as a real-time indicator of product accumulation. As amplification cycles generate more target DNA, the monitored signal changes accordingly, allowing the measurement to follow the reaction rather than relying only on an endpoint observation. This provides the basis for relating amplification behavior to the amount of viral genetic material present in the original sample.
A standard curve provides the reference needed to interpret fluorescence quantitatively. The signal from an unknown sample is compared with signals produced by standards containing known amounts of viral DNA. That comparison converts the measured amplification result into an estimated copy number, allowing viral concentrations or loads to be expressed numerically and compared across samples.
The workflow begins with a biological or environmental sample containing viral genetic material. The target DNA then undergoes repeated quantitative PCR cycles, with fluorescence monitored as product accumulates. Finally, the observed signal is compared with a standard curve to estimate copy number. This sequence produces a numerical result suitable for comparing samples or tracking changes over time.
It is useful when researchers need to assess viral infection, measure replication, or evaluate the effect of an antiviral treatment. Quantifying viral genetic material provides a numerical basis for examining whether viral levels differ among samples or change during an experiment. These measurements can therefore support both infection analysis and treatment-related comparisons.
In virus production studies, quantification helps determine how much viral genetic material is present in a preparation. In broader biological techniques, repeated measurements can characterize viral dynamics over time by showing how viral levels change during an experiment. The same approach also supports diagnostic workflows and analysis of environmental samples when numerical viral estimates are required.