Dna Base Quantification
Dna Base Quantification - Related Videos
02:27
DNA Base Pairing
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2020
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule, the amount of adenine (A) is equal to the amount of thymine (T); the amount of guanine (G) is equal to the amount of cytosine (C); and the sum of purines, A and G, is equal to the sum of pyrimidines, C and T (i.e., A+G = C+T). Later work by Watson and Crick revealed that in double-stranded DNA, A always forms two hydrogen bonds...
10:47
High-Throughput Image-Based Quantification of Mitochondrial DNA Synthesis and Distribution
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2023
A procedure for studying the dynamics of mitochondrial DNA (mtDNA) metabolism in cells using a multi-well plate format and automated immunofluorescence imaging to detect and quantify mtDNA synthesis and distribution is described. This can be further used to investigate the effects of various inhibitors, cellular stresses, and gene silencing on mtDNA metabolism.
13:16
Assessment of DNA Contamination in RNA Samples Based on Ribosomal DNA
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Cited by 26 •
2018
Here, we present a protocol for tracing genomic DNA (gDNA) contamination in RNA samples. The presented method utilizes primers specific for the internal transcribed spacer region (ITS) of ribosomal DNA (rDNA) genes. The method is suited for reliable and sensitive detection of DNA contamination in most eukaryotes and prokaryotes.
04:11
Real-Time Polymerase Chain Reaction-Based Detection and Quantification of Hepatitis B Virus DNA
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Cited by 3 •
2023
Real-time polymerase chain reaction (PCR)-based detection and quantification of hepatitis B virus (HBV) DNA is a sensitive and accurate method for diagnosing and monitoring HBV infection. Here, we present a protocol for HBV DNA detection and the viral load measurement of a sample.
09:15
DNA-based Fish Species Identification Protocol
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Cited by 9 •
2010
This publication describes how to use the Agilent Fish Species Identification System to identify the species of a fish by extracting DNA and performing PCR and RFLP analysis.
FAQs
Hydrolysis converts the DNA sample into individual bases or nucleosides that can be analyzed separately. This breakdown makes it possible to distinguish adenine, thymine, guanine, and cytosine during chromatographic separation and subsequent measurement. Without converting the larger DNA molecule into these measurable components, the analysis would not directly resolve the amounts of the individual bases.
Chromatography separates the hydrolyzed DNA components before detection, allowing signals associated with different bases or nucleosides to be distinguished. This separation supports more specific measurement than analyzing the combined sample response. The resulting chromatographic data can then be compared with calibrated standards to determine the amounts present in the DNA preparation.
Calibrated standards provide reference responses for known amounts of the analytes. Comparing sample signals with those standards allows detector output, such as absorbance or mass spectrometric response, to be translated into concentrations. This calibration is essential for calculating relative base proportions and for making meaningful comparisons between DNA samples or preparations.
The relative amounts of adenine, thymine, guanine, and cytosine provide a compositional profile for each sample. Comparing these profiles can reveal differences among DNA preparations or genomes, while the measured amounts also contribute to evaluating sample quality. Interpretation therefore connects chromatographic measurements with molecular composition rather than treating detector signals as isolated values.
A typical workflow begins by hydrolyzing the DNA, followed by chromatographic separation of the resulting bases or nucleosides. The separated components are measured with a detector, such as an absorbance or mass spectrometric system, and the signals are evaluated against calibrated standards. Concentrations and relative proportions are then calculated from the measured responses.
Researchers can apply the analysis when they need to compare DNA preparations or examine differences in genome composition. The measurements provide quantitative information about individual base amounts and their relative proportions, while the same results can help assess sample quality. This makes the method useful when molecular composition must be compared across samples rather than inferred from a single signal.
In biochemistry, the measurements connect DNA composition with studies of nucleic-acid structure, enzymatic modification, and molecular composition. Quantifying the bases provides an analytical readout that can be compared across DNA samples or preparations. It therefore helps researchers examine how composition relates to the biochemical material under investigation and supports characterization beyond simple sample identification.