Primer Design
Primer Design - 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.
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.
02:01
Group Design
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2020
The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between the two are due to...
06:42
From Theory to Design: The Role of Creativity in Designing Experiments
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2023
Source: Laboratories of Gary Lewandowski, Dave Strohmetz, and Natalie Ciarocco—Monmouth University Research studies come into being when a researcher speculates about human thought, emotions, or behavior, and has a theory that offers a potential explanation. Often the researcher’s theory is firmly situated in everyday common experiences that may not naturally lend themselves to direct empirical study. For example, researchers speculated that perception of a person on Facebook is influenced by...
FAQs
Primer placement defines the boundaries of the genetic region being copied. Each primer anneals to a complementary sequence flanking the target and presents a free 3′ end for DNA polymerase extension. Because amplification depends on both primers acting in compatible positions, incorrect placement can prevent efficient copying or produce a region different from the one intended.
Compatible melting temperatures help both primers anneal under the same cycling conditions. If one primer binds effectively while the other does not, amplification can become inefficient or less specific. Balancing this property therefore supports coordinated primer behavior during the annealing stage and improves the likelihood that repeated PCR cycles enrich the selected target rather than unintended sequences.
Self-complementary sequences can allow a primer to pair with itself or with its partner instead of binding the intended target. These interactions may create primer-dimers or other competing structures, reducing the primers available for target amplification. Evaluating self-complementarity is therefore important when designing pairs intended to produce a specific, interpretable assay result.
Begin by selecting the genetic region to amplify or analyze, then identify complementary sequences that flank the target. Next, assess whether the proposed primers have suitable melting temperatures, work compatibly as a pair, and show minimal self-complementarity. This sequence-focused review helps refine a design before it is applied to PCR or another molecular assay.
Primer design supports several distinct molecular tasks, including conventional PCR, quantitative PCR, DNA sequencing, cloning, genotyping, and detection of genes or pathogens. In each case, the selected oligonucleotides direct attention to a chosen genetic region. The resulting design influences whether the assay can selectively amplify or analyze the sequence relevant to the biological question.
Reliable assays depend on primers that direct amplification or analysis toward the intended genetic region while limiting competing interactions. Specific target placement, compatible melting temperatures, and low self-complementarity collectively help reduce nonspecific products and primer-dimers. In biology, these design choices support clearer results when researchers investigate genes, compare genotypes, analyze sequences, or detect pathogens.