Dna Blotting
Dna Blotting - Related Videos
04:11
5-Methylcytosine Dot Blot to Determine the Extent of DNA Methylation
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2025
This video describes the technique of dot-blot to determine the level of DNA methylation in human chondrocytes in vitro via the blotting of DNA samples on a nylon membrane and the subsequent visualization using monoclonal antibodies. This helps to determine the chondrocytes' phenotype at various stages in culture.
10:07
A 5-mC Dot Blot Assay Quantifying the DNA Methylation Level of Chondrocyte Dedifferentiation In Vitro
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Cited by 17 •
2017
We present a method to quantify DNA methylation based on the 5-methylcytosine (5-mC) dot blot. We determined the 5-mC levels during chondrocyte dedifferentiation. This simple technique could be used to quickly determine the chondrocyte phenotype in ACI treatment.
06:57
Dot Blot Assay to Quantify Viral Genome
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2025
In this video, we describe the dot blot assay to quantify a viral genome. The signal intensity is directly related to the amount of viral DNA in the sample.
08:48
The Western Blot
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2023
Western Blotting is used to identify the presence of specific proteins in electrophoretically separated samples. Following separation by a technique known as sodium dodecyl sulfate polyacrylamide gel electrophoresis, or SDS-PAGE, western transfer is used to move proteins from a polyacrylamide gel onto a piece of membrane which traps the proteins in their respective locations. Next, the membranes are probed with antibodies in a process called immunboblotting. Immunoblotting uses...
01:15
Western Blotting
0 Views •
2023
Western blotting is an analytical technique for protein identification. It has various applications in immunology and medicine, including detecting diseases like bovine spongiform encephalopathy, mad cow disease, and human and feline immunodeficiency virus from biological samples. The technique begins with separating proteins from the sample using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), followed by protein transfer, immunoblotting, and finally, protein detection.
FAQs
Restriction enzymes determine where genomic DNA is cut, producing fragments whose lengths depend on the locations of those sites. If a sequence variation alters a cutting site or changes the intervening structure, fragment sizes can differ. These differences become observable after electrophoretic separation and can support analysis of polymorphisms, insertions, deletions, or rearrangements.
Denaturation separates double-stranded DNA into single strands, allowing the labeled probe to pair with its complementary target sequence. This hybridization creates a detectable signal at the relevant location on the membrane. The combination connects a physical fragment pattern with a specific DNA sequence rather than indicating fragment size alone.
Restriction fragment length polymorphisms arise when inherited DNA differences alter fragment lengths. After separation and probe detection, samples can show different positions or patterns for the same genomic region. Comparing these patterns allows researchers to track sequence-linked variation and study inheritance without determining the complete DNA sequence.
DNA blotting can expose gene rearrangements, insertions, deletions, and changes in copy number, not merely whether a target sequence exists. These findings provide information about genomic structure or the relative representation of a gene. The approach therefore helps researchers examine how a region is organized and whether its dosage has changed.
The workflow first creates DNA fragments with restriction enzymes and separates them by size through gel electrophoresis. DNA is then denatured, transferred to a membrane, and exposed to a labeled complementary probe. Fragment separation supplies size information, while probe hybridization identifies which separated fragment contains the target sequence.
DNA blotting remains useful when researchers need to examine genome structure directly through restriction-fragment patterns. Although newer amplification and sequencing methods are often faster, blotting can provide an independent way to evaluate rearrangements, insertions, deletions, or copy-number changes. This makes it valuable for validating structural conclusions in genetic analysis.
Researchers can compare restriction-fragment patterns among samples to follow inherited variation at a particular genomic region. Differences associated with restriction fragment length polymorphisms provide a way to distinguish genetic patterns across individuals or families. This application supports inheritance studies while also linking observed patterns to changes in underlying DNA structure.