Random Primer Pcr
Random Primer Pcr - Related Videos
11:14
Primer-Free Aptamer Selection Using A Random DNA Library
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Cited by 20 •
2010
SELEX protocols comprise multiple rounds of selection, each of which require regeneration of bound ligands, which in turn require fixed primer sequences flanking the random library regions. These fixed primer sequences can interfere with the selection process (false positives and negatives). Here we present a primer-free protocol.
13:27
PCR: The Polymerase Chain Reaction
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2023
The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling – cyles of temperature changes at fixed time intervals. Using a thermostable DNA polymerase, PCR can create numerous copies of DNA from DNA building blocks called dNTPs. There are three steps in PCR: denaturation, annealing, and elongation. Denaturation is the first step in the cycle and causes the DNA to melt by disrupting hydrogen bonds between the bases resulting in single-stranded DNA. Annealing...
15:28
Primer Extension Capture: Targeted Sequence Retrieval from Heavily Degraded DNA Sources
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Cited by 41 •
2009
We present a method of targeted ancient DNA sequence retrieval, which we used to reconstruct the complete mitochondrial genomes of five Neandertal individuals. Comparison of these sequences with present day humans suggests that Neandertals had a long term low effective population size.
10:17
Laboratory Protocol for Genetic Gut Content Analyses of Aquatic Macroinvertebrates Using Group-specific rDNA Primers
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Cited by 7 •
2017
Most common gut content analyses of macroinvertebrates are visual. Requiring intense knowledge about morphological diversity of prey organisms, they miss soft bodied prey and, due to strong comminution of prey, are nearly impossible for some organisms, including amphipods. We provide detailed, novel genetic approaches for macroinvertebrate prey identification in the diet of amphipods.
14:07
Genome-wide Gene Deletions in Streptococcus sanguinis by High Throughput PCR
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Cited by 9 •
2012
An efficient genome-wide single gene mutation method has been established using Streptococcus sanguinis as a model organism. This method has achieved via high throughput recombinant PCRs and transformations.
FAQs
Low-stringency annealing allows short primers to bind at partially matching sites across the DNA template rather than only at exact target sequences. DNA polymerase then extends from these bound primers during each cycle, generating fragments from multiple distributed regions. This broad sampling makes the technique useful when relevant genomic sequences are unknown or highly variable.
The banding pattern reflects the locations where primers can partially match and be extended on the template. Sequence differences may change which regions are amplified, allowing related microbial genomes to produce similar but distinguishable profiles. Interpretation therefore focuses on the overall distribution of amplified fragments as an indicator of genetic variation.
PCR based on a known target sequence is directed toward a specific region, whereas Random Primer PCR samples multiple regions without requiring prior sequence information. This makes the random-primer approach valuable for preliminary analysis of unknown or variable genomes. Its broader profile, however, does not by itself provide the precise identification that additional molecular methods can support.
A basic workflow combines the DNA template with short, nonspecific primers and DNA polymerase, followed by repeated cycles of denaturation, low-stringency annealing, and extension. The resulting amplified profile can then be examined for differences among samples. Because the method samples multiple template regions, consistent handling of the reaction is important when profiles are compared.
The technique is useful when investigators need to compare microbial genomes without complete information about their target sequences. Amplified profiles can support preliminary assessment of genetic variation, pathogen diversity, and relationships among related strains. These comparisons may help organize samples for further study, although additional molecular analysis is needed for precise identification.
Differences in profiles can indicate that related pathogens contain variation at genomic regions sampled by the primers, while shared patterns can support broader similarity. In immunology and infection research, this provides a comparative view of microbial diversity and strain differences. The profiles are best treated as screening or comparison results, not as definitive identifications.