Dna Assay
Dna Assay - Related Videos
10:00
Assaying DNA Damage in Hippocampal Neurons Using the Comet Assay
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Cited by 21 •
2012
The comet assay is an efficient way of detecting single- and double-strand breaks, including alkali-labile sites and DNA-DNA/DNA-protein cross-links on the DNA in all cells including hippocampal neurons. The method takes advantage of the differential migration of DNA in an electric field due to differences in amount of DNA damage.
10:38
In Vivo Alkaline Comet Assay and Enzyme-modified Alkaline Comet Assay for Measuring DNA Strand Breaks and Oxidative DNA Damage in Rat Liver
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Cited by 17 •
2016
The alkaline comet assay measures DNA strand breaks in eukaryotic cells. By adding an Endonuclease III or human 8-oxoguanine-DNA-N-glycosylase digestion step, the assay can efficiently detect oxidative DNA damage. We describe methods for using these assays to detect DNA damage in rat liver.
17:03
Direct Observation of Enzymes Replicating DNA Using a Single-molecule DNA Stretching Assay
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Cited by 13 •
2010
We describe a method for observing real time replication of individual DNA molecules mediated by proteins of the bacteriophage replication system.
06:19
Comet Assay for DNA Damage Detection in Cells
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2025
The video demonstrates the comet assay for detecting DNA damage following exposure to harmful agents. Under alkaline conditions, the DNA unwinds and denatures, and upon electrophoresis, the undamaged and damaged DNA migrate differently in the agarose gel, forming a comet-shaped structure. The slowly migrating undamaged DNA forms the circular comet head, while the rapidly migrating damaged DNA fragments form the elongated comet tail.
07:38
DNA Polymerase Activity Assay Using Near-infrared Fluorescent Labeled DNA Visualized by Acrylamide Gel Electrophoresis
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Cited by 2 •
2017
This protocol describes the characterization of DNA polymerase synthesis of modified DNA through observation of changes to near-infrared fluorescently labeled DNA using gel electrophoresis and gel imaging. Acrylamide gels are used for high resolution imaging of the separation of short nucleic acids, which migrate at different rates depending on size.
FAQs
Complementary base pairing allows assay components to recognize a selected target sequence rather than unrelated DNA. This sequence-level matching helps determine whether a signal reflects the intended genetic material. In bioengineering, that specificity is important when verifying an engineered construct or distinguishing a genetic variant from background sequences.
The readout depends on how the assay converts target recognition into evidence, such as amplification, fluorescence, or an enzymatic reaction. These formats can support different goals, including detecting a target, measuring nucleic-acid amounts, or characterizing DNA. Selecting a readout that matches the intended measurement helps connect the observed signal to the biological question.
Controls help reveal whether an observed signal is attributable to the intended target rather than background or an assay-related problem. Because DNA assays may rely on different signal-generating mechanisms, controls support confidence in specificity and measurement. In research and quality assessment, they make results more dependable when constructs, variants, or biological systems are being evaluated.
Amplification can turn recognition of a target sequence into a stronger or more readily measured assay signal. That makes it useful when the goal is to detect or quantify nucleic acids, while the assay design still determines which sequence is being measured. In bioengineering workflows, amplification-based readouts can therefore support construct verification and monitoring of biological systems.
Begin by defining whether the assay must detect, measure, or characterize DNA. Then select a target sequence, use complementary recognition, and choose a signal format such as amplification, fluorescence, or an enzymatic reaction. Incorporating appropriate controls is essential before interpreting results. This design sequence aligns the assay with construct verification, variant identification, or system monitoring.
For an engineered construct, the assay can target DNA sequences whose presence or characteristics are relevant to the design. A matching signal provides evidence that the intended genetic material is present, while characterization can supply additional information about the construct. This application connects molecular measurement with bioengineering tasks such as synthetic biology and quality assessment.
They are useful when researchers need a DNA-based measurement linked to changes in a biological system or to the quality of a bioprocess. Depending on assay design, the output may indicate target presence, nucleic-acid quantity, or genetic characteristics. Such information supports process development and quality assessment by providing a measurable molecular readout rather than relying only on broader observations.