Genomic Dna Extraction
Genomic Dna Extraction - Related Videos
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.
02:44
Single Worm PCR: A Method to Extract and Amplify Genomic DNA
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2023
This video describes a technique to rapidly screen a single nematode for a genetic marker by PCR screening. In the example protocol, we screen for CRISPR-based genome editing.
02:14
Thermal Lysis-Based Genomic DNA Extraction from a Pathogenic Bacterium
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2025
Source: Gulla, S., et al. Multi-locus Variable-number Tandem-repeat Analysis of the Fish-pathogenic Bacterium Yersinia ruckeri by Multiplex PCR and Capillary Electrophoresis. J. Vis. Exp. (2019).This protocol extracts genomic DNA from Yersinia ruckeri by suspending isolated colonies in ultrapure water and applying heat to lyse the cells. Centrifugation separates the DNA-containing supernatant from cell debris, yielding template DNA suitable for PCR-based genotyping and epidemiological analysis.
10:43
A Practical and Novel Method to Extract Genomic DNA from Blood Collection Kits for Plasma Protein Preservation
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Cited by 4 •
2013
We are describing a new method of isolating genomic DNA from whole blood collected for plasma/serology. After plasma collection, the compacted blood is usually discarded. Our novel method represents a significant improvement over existing methods and makes DNA and plasma available from a single collection, without requesting additional blood.
08:56
Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
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2018
Here we present a new approach to identify plant viruses with double-strand DNA genomes. We use standard methods to extract DNA and RNA from infected leaves and carry out next-generation sequencing. Bioinformatic tools assemble sequences into contigs, identify contigs representing virus genomes and assign genomes to taxonomic groups.
FAQs
Lysis must disrupt both cell and nuclear membranes so chromosomal DNA becomes accessible for recovery. Chemical or mechanical disruption can initiate this step, but handling must remain controlled because the goal is to release high-molecular-weight DNA without compromising its integrity. Effective lysis therefore influences how much usable genomic material is available for later molecular analysis.
Protein and other cellular contaminants can remain associated with the recovered material if purification is incomplete. Removing them improves DNA purity and makes the preparation more suitable for downstream procedures such as PCR, restriction analysis, genotyping, and sequencing. Careful purification is therefore not merely a cleanup step; it directly affects the reliability of subsequent biological measurements.
These approaches recover DNA through different mechanisms. Alcohol precipitation concentrates DNA from the extraction mixture, whereas silica-membrane workflows bind DNA to a membrane, wash away unwanted material, and then elute the DNA. Both can produce material for molecular analysis, but the selected recovery route determines how purification and collection are organized within the workflow.
A typical workflow begins by disrupting cellular and nuclear membranes, followed by removal of proteins and other contaminants. The DNA is then recovered either through alcohol precipitation or by binding it to a silica membrane, washing the bound material, and eluting it. Preserving DNA integrity throughout these stages helps produce a preparation suitable for later analysis.
The same purified genomic material can serve several analytical purposes. PCR can support targeted amplification, restriction analysis can examine cleavage patterns, genotyping can assess genetic differences, and sequencing can provide sequence information. These applications require DNA that is sufficiently pure and intact, so extraction quality influences which downstream analyses can be performed reliably.
This preparation is useful whenever investigators need to examine chromosomal genetic material from cells or tissues. It supports studies of genomes, genetic variation, disease-associated changes, and biological relationships. By providing purified DNA for molecular assays, the procedure connects biological samples with analyses that can reveal inherited or acquired differences at the genetic level.