Dna Mutation Analysis
Dna Mutation Analysis - Related Videos
08:47
DNA Methylation Analysis
0 Views •
2023
Methylation at CpG dinucleotides is a chemical modification of DNA hypothesized to play important roles in regulating gene expression. In particular, the methylation of clusters of methylation sites, called “CpG islands”, near promoters and other gene regulatory elements may contribute to the stable silencing of genes, for example, during epigenetic processes such as genomic imprinting and X-chromosome inactivation. At the same time, aberrant CpG methylation has been shown to be associated with...
08:29
Profiling Epidermal Growth Factor Receptor DNA Mutations in Circulating Rare Cells Using a Cell Isolation System and Droplet Digital PCR
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2026
Here we present a protocol to illustrate the isolation of rare cancer cells from a contrived sample containing whole blood and spiked in lung cancer cells. The protocol utilizes a semi-automated, label-free cell isolation platform. Enriched cells are subsequently analyzed for epidermal growth factor receptor mutations using droplet digital PCR.
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...
07:53
Quantification of Colonic Stem Cell Mutations
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Cited by 1 •
2015
We report significant improvements for the reproducible measurement of somatic colonic stem cell mutations after exposure of mice to potential DNA damaging agents.
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
These changes alter DNA sequence in different ways. A substitution replaces one nucleotide, whereas an insertion adds sequence and a deletion removes it. Larger rearrangements affect broader DNA segments. Distinguishing these categories helps researchers describe the variant accurately and assess how the change may relate to inherited conditions, cancer development, microbial evolution, or drug response.
A reference sequence provides a standard for identifying differences in the DNA being studied. Researchers compare the determined sequence with that reference to locate and characterize variants, rather than examining the sequence in isolation. This comparison supports consistent interpretation and helps connect detected changes with biological questions addressed in genetic, cancer, microbial, or drug-response research.
A sequence difference becomes biologically informative when researchers examine its possible relationship to a biological outcome or process. Analysis may help connect variants with inherited conditions, cancer development, microbial evolution, or differences in drug response. The result guides genetic screening, disease research, molecular diagnosis, and targeted experiments, while the sequence finding itself provides the underlying evidence.
The workflow begins with DNA isolation from the material under study. Researchers may then amplify selected regions when additional copies are needed, determine or read the nucleotide sequence, and compare that result with a reference sequence. The comparison identifies variants for further interpretation in relation to the biological question being investigated.
Amplification is used when the analysis focuses on particular DNA regions and additional copies of those regions are needed before sequence determination or reading. It is therefore a conditional step rather than an unavoidable part of every workflow. Selecting relevant regions can direct the analysis toward a genetic, disease-related, microbial, or drug-response question.
This analysis supports several biology applications, including genetic screening, molecular diagnosis, and research on disease mechanisms. It also helps investigate cancer development, microbial evolution, inherited conditions, and differences in drug response. In experimental work, the findings can guide the design of targeted studies by identifying sequence changes that merit closer biological investigation.