Modified Dna Analysis
Modified Dna 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...
08:42
Determination of Zeta Potential via Nanoparticle Translocation Velocities through a Tunable Nanopore: Using DNA-modified Particles as an Example
0 Views •
Cited by 7 •
2016
Here we use a polyurethane tunable nanopore integrated into a resistive pulse sensing technique to characterize nanoparticles surface chemistry via the measurement of particle translocation velocities, which can be used to determine the zeta potential of individual nanoparticles.
10:47
A Modified Yeast-one Hybrid System for Heteromeric Protein Complex-DNA Interaction Studies
0 Views •
Cited by 2 •
2017
The modified yeast one-hybrid assay described here is an extension of the classical yeast one-hybrid (Y1H) assay to study and validate the heteromeric protein complex-DNA interaction in a heterologous system for any functional genomics study.
04:12
Modified Yeast-One Hybrid Assay to Detect Heteromeric Protein Complex-DNA Interactions
0 Views •
2025
In this video, we demonstrate the modified yeast one-hybrid assay, which detects multiple proteins interacting with target DNA. The transformed yeast cells contain the target DNA sequence upstream of the reporter gene. Additionally, they express transcription factor proteins. When the proteins form complexes and bind to the target DNA, the reporter gene is expressed and can be detected enzymatically.
12:34
DNA Methylation: Bisulphite Modification and Analysis
0 Views •
Cited by 75 •
2011
The gold standard for DNA methylation analysis is genomic sequencing of bisulphite converted DNA. This method takes advantage of the increased sensitivity of cytosine compared with 5-methylcytosine (5-MeC) to bisulphite deamination under acidic conditions. Unmethylated cytosines can be distinguished from methylated cytosines after PCR amplification of the target genomic DNA.
FAQs
These strategies create measurable differences between modified and unmodified DNA. Selective conversion changes the chemical form of a target base, whereas selective cleavage produces fragments at informative sites; enrichment or labeling concentrates or marks the relevant molecules. Researchers then analyze those products to infer where modifications occur and relate their distribution to biochemical regulation or genome stability.
Each readout emphasizes a different level of evidence. Sequencing can locate modification-associated changes along DNA, mass spectrometry can characterize chemical species, and electrophoresis can resolve the resulting fragments by their migration behavior. Choosing among them depends on whether the investigation prioritizes genomic position, molecular composition, or fragment-based comparison.
The analytical choice determines which molecular feature becomes visible. Conversion and cleavage generate altered fragment patterns, enrichment increases representation of selected DNA, and labeling provides a detectable tag. Because these strategies emphasize different properties, the resulting data support different interpretations, from modification location to chemical characterization or comparative fragment analysis.
A typical workflow begins by selecting a modification-sensitive treatment, such as conversion, enrichment, labeling, or cleavage. The treated DNA is then examined through sequencing, mass spectrometry, or electrophoresis. Researchers interpret the measured fragments or chemical signals as patterns of modification, then connect those patterns with gene regulation, genome stability, or cellular responses.
It supports investigations of epigenetic patterns, gene regulation, genome stability, and disease-associated molecular changes. Researchers can also use it to assess cellular responses to environmental or developmental signals. These findings provide context for diagnostics, therapeutics, and biotechnology, while preserving a connection between molecular measurements and biological outcomes.
Biochemical interpretation depends on connecting a modification’s chemical signature with its location and measured effect. Mapping patterns across DNA helps researchers examine how molecular changes relate to gene regulation, genome stability, or cellular responses. This structure-to-function perspective treats the analytical result not merely as a fragment pattern, but as evidence about biological control.