Dna Extraction
Dna Extraction - Related Videos
09:59
Community DNA Extraction from Bacterial Colonies
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner Traditional methods of analysis for microbial communities within soils have usually involved either cultural assays utilizing dilution and plating methodology on selective and differential media or direct count assays. Direct counts offer information about the total number of bacteria present, but give no information about the number or diversity of populations present...
09:30
Extraction of High Molecular Weight DNA from Microbial Mats
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Cited by 4 •
2011
We provide an improved protocol for extracting high molecular weight DNA from hypersaline microbial mats. Microbial cells are separated from the mat matrix prior to DNA extraction and purification. This enhances the concentrations, quality, and size of the DNA. The protocol may be used for other refractory samples.
06:58
Collection and Extraction of Saliva DNA for Next Generation Sequencing
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Cited by 45 •
2014
DNA extraction from saliva can provide a readily available source of high molecular weight DNA, with little to no degradation/fragmentation. This protocol provides optimized parameters for saliva collection/storage and DNA extraction to be of sufficient quality and quantity for downstream DNA assays with high quality requirements.
10:55
Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
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Cited by 35 •
2012
Xenopus egg extract is a useful model system to investigate the DNA damage checkpoint. This protocol is for the preparation of Xenopus egg extracts and DNA damage checkpoint inducing reagents. These techniques are adaptable to a variety of DNA damaging approaches in the study of the DNA damage checkpoint signaling.
11:24
Extraction of High Molecular Weight Genomic DNA from Soils and Sediments
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Cited by 21 •
2009
A methodology to isolate high molecular weight and high quality genomic DNA from soil microbial community is described.
FAQs
DNA is enclosed within cellular structures, so extraction must open both cell and nuclear membranes before purification can proceed. Mechanical disruption and lysis perform this release step. If membrane disruption is incomplete, less genetic material becomes available for subsequent cleanup, reducing the amount of DNA recovered for analysis.
Detergents, salts, and enzymes are used during cleanup to remove proteins and other contaminants that accompany released DNA. Their inclusion helps separate the desired genetic material from unwanted cellular components. Effective removal matters because downstream PCR, sequencing, genotyping, cloning, and diagnostic studies require DNA with sufficient purity.
Both methods concentrate DNA after cell disruption and contaminant removal, but they use different purification strategies. Alcohol precipitation collects DNA from the prepared sample, whereas column-based purification uses a purification column during recovery. The selected approach affects how the isolated material is recovered and prepared for downstream molecular biology experiments.
A typical workflow begins by disrupting the sample and lysing cell and nuclear membranes. Detergents, salts, or enzymes then help remove proteins and other contaminants. Finally, alcohol precipitation or column-based purification concentrates the DNA. The resulting preparation can be carried forward to PCR, sequencing, genotyping, cloning, or diagnostic analysis.
A reliable preparation provides DNA that is sufficiently pure and intact for downstream experiments. This quality supports its use in PCR, sequencing, genotyping, cloning, and diagnostic studies. Less suitable preparations may compromise these analyses, making contaminant removal and DNA concentration important endpoints when evaluating the extraction.
Researchers use extracted DNA in molecular biology and genetics to support analyses such as PCR, sequencing, genotyping, and cloning. The material also enables diagnostic studies and contributes to applications in medicine, forensics, and biotechnology. Its value extends across these fields because each requires accessible genetic material for analysis or investigation.