Dna Mutation Assays
Dna Mutation Assays - Related Videos
04:00
Evaluating Mutation Frequency in Bacteria Using the Beta-Glucosidase Assay
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2025
Source: Stefan, A., et al. The Multifaceted Benefits of Protein Co-expression in Escherichia coli. J. Vis. Exp. (96), (2015).This video demonstrates the evaluation of mutation frequency in bacteria using a beta-glucosidase assay. Bacterial cultures expressing a proofreading-deficient DNA polymerase are collected over successive generations. Replication errors caused by reduced proofreading may activate a suppressed beta-glucosidase gene. After centrifugation and permeabilization, a substrate is...
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.
00:36
Viral Mutations
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2019
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
11:15
Next Generation Sequencing for the Detection of Actionable Mutations in Solid and Liquid Tumors
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Cited by 8 •
2016
This manuscript describes clinical protocols for two next-generation sequencing panels. One panel interrogates hematologic malignancies while the other panel targets genes commonly mutated in solid tumors. Molecular classification of driver mutations in human malignancies offers valuable prognostic and predictive information.
03:12
Mosquito Embryo Microinjection: A Technique to Deliver Exogenous DNA into Embryo Yolk of Anopheles Gambiae to Generate Germline Mutations
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2025
In this video, we demonstrate the delivery of gene drive construct into the embryo of Anopheles gambiae mosquito through embryo microinjection technique. This procedure allows for integration of delivered DNA construct, through homologous recombination, into the germline cells to generate transformed mosquito population.
FAQs
The assay first focuses analytical attention on a defined target region or on a mutation-dependent signal. It then compares the resulting readout with a reference sequence or reference pattern. This comparison can reveal whether a nucleotide change is present and, depending on the assay design, support detection of rare variants or estimation of how frequently a mutation occurs.
These approaches provide different ways to recognize sequence alterations. Allele-specific detection targets a particular variant, whereas hybridization distinguishes sequences through their interaction with a complementary reference. Restriction analysis supplies another mutation-sensitive readout, while sequencing identifies the nucleotide sequence itself. Selecting among them depends on whether the study requires targeted detection, comparative analysis, or sequence-level characterization.
Assay design determines which genetic change produces a measurable signal and how that signal is compared with a reference. A design centered on a defined target can support mutation-frequency measurements, while a design intended to capture mutation-dependent signals can help identify rare variants. These choices affect the type of genetic-stability information the experiment can provide.
A typical workflow begins by selecting the genomic region or mutation-dependent feature relevant to the biological question. The assay then amplifies the target or captures a signal associated with the mutation. Finally, allele-specific detection, hybridization, restriction analysis, or sequencing distinguishes altered DNA from the reference. The resulting pattern can be interpreted for variant identity, frequency, or genomic damage.
Researchers apply these assays when they need evidence about genetic variation or genomic damage rather than only a general measure of biological response. The methods can examine effects associated with environmental exposures, disease processes, or experimental treatments. They are therefore useful for evaluating whether a condition or intervention is associated with altered genetic stability in the studied system.
In cancer research, the assays help characterize genetic changes linked to disease processes. In inherited disease studies, they support investigation of sequence variation, while microbial surveillance uses them to monitor genetic differences in microbial populations. After genome editing, the same approaches can validate whether the intended sequence outcome occurred and help identify altered DNA in the examined material.