Dna Fragment Purification
Dna Fragment Purification - Related Videos
06:13
Electroeluting DNA Fragments
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Cited by 8 •
2010
This procedure allows the purification of DNA fragments with high yield.
07:10
Agarose Gel Electrophoresis for the Separation of DNA Fragments
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Cited by 599 •
2012
A basic protocol for the separation of DNA fragments using agarose gel electrophoresis is described.
06:58
Real-time Tracking of DNA Fragment Separation by Smartphone
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Cited by 2 •
2017
Traditional slab gel electrophoresis (SGE) experiments require a complicated apparatus and high chemical consumption. This work presents a protocol that describes a low-cost method to separate DNA fragments within a short timeframe.
11:00
Genotyping of Plant and Animal Samples without Prior DNA Purification
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Cited by 14 •
2012
The Direct PCR approach presented here facilitates PCR amplification directly from small amounts of unpurified plant and animal tissue.
09:14
DamID-seq: Genome-wide Mapping of Protein-DNA Interactions by High Throughput Sequencing of Adenine-methylated DNA Fragments
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Cited by 21 •
2016
We describe herein an assay by coupling DNA adenine methyltransferase identification (DamID) to high throughput sequencing (DamID-seq). This improved method provides a higher resolution and a wider dynamic range, and allows analyzing DamID-seq data in conjunction with other high throughput sequencing data such as ChIP-seq, RNA-seq, etc.
FAQs
Chaotropic salts create conditions that promote DNA binding to silica surfaces or magnetic beads. This selective binding helps retain the desired fragment while proteins, enzymes, primers, and other unwanted molecules remain available for removal. The binding step is therefore central to separating nucleic acid from the biochemical mixture before recovery for subsequent analysis.
Washing removes residual contaminants that may interfere with later biochemical reactions, including salts, proteins, enzymes, primers, or agarose. Elution then reverses the binding conditions by using a low-salt buffer, releasing the DNA fragment from the membrane or beads. Together, these steps determine whether the recovered material is sufficiently clean and usable.
Size selection separates DNA fragments according to length rather than only removing unwanted chemical components. This distinction allows a workflow to retain fragments within a desired size range while excluding others. It is particularly useful when the identity or suitability of a fragment depends on its length, complementing the contaminant-removal function of membrane or bead-based purification.
A common workflow uses a DNA-containing sample, chaotropic salts, and either a silica membrane or magnetic beads for binding. Washing removes retained contaminants, and a low-salt buffer elutes the fragment. When length discrimination is needed, a size-selection step is added. The resulting material is assessed by its suitability for the intended downstream biochemical procedure.
Purification is useful whenever unwanted proteins, enzymes, salts, primers, or agarose could compromise a downstream workflow. Removing these substances and recovering the desired fragment improves sample quality and concentration for cloning, sequencing, amplification, labeling, and related analyses. The method therefore serves as a preparation step between fragment generation or separation and the next biochemical reaction.
Purified DNA provides a cleaner input for reactions that depend on a suitable fragment concentration and composition. By reducing contaminants and, when necessary, restricting the sample to a selected size range, purification can improve reaction performance. This makes the recovered material more appropriate for biochemical workflows such as amplification, sequencing, cloning, and labeling.