Nested Pcr
Nested Pcr - Related Videos
03:20
Nested-PCR to Detect a Specific Viral Genomic Sequence
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2025
This video describes nested polymerase chain reaction, a technique that consists of two sequential PCR amplification processes using two primer sets. The first set of primers is intended to anneal to sequences upstream of the second set, resulting in selective amplification of specific gene sequences. This PCR is more sensitive and specific than a normal PCR and is widely used as a detection technique for various diseases.
07:20
Detecting the Lyme Disease Spirochete, Borrelia Burgdorferi, in Ticks Using Nested PCR
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Cited by 21 •
2018
Nested PCR is a sensitive, specific, and straightforward technique that can be applied to tick DNA extracts to probe for Borrelia burgdorferi, the causative agent of Lyme disease. The initial PCR experiment uses gene-specific primers to generate long amplicons, which then become templates for a subsequent reaction using internal primers.
06:12
Nest Building as an Indicator of Health and Welfare in Laboratory Mice
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Cited by 192 •
2013
We demonstrate the utility of nest building behavior in laboratory mice as an indicator of welfare. Nest scoring is a sensitive technique that is altered by temperature, illness, and aggression. The time to integrate into nest test (TINT) is a simple cage-side assessment that can detect postoperative pain.
08:23
Assessing Burrowing, Nest Construction, and Hoarding in Mice
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Cited by 210 •
2012
Burrowing, nesting, and hoarding are species-typical activities that mice readily perform in the laboratory. This article describes how they can be easily and cheaply assessed. These protocols are extremely sensitive to mouse strain, brain lesions and diseases. Moreover they constitute “environmental enrichment” for the mice, and embody the “Refinement” aspect of the “3 Rs”18.
06:03
A Push-pull Protocol to Reduce Colonization of Bird Nest Boxes by Honey Bees
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Cited by 1 •
2016
Preventing colonization of bird nest boxes by invasive Africanized honey bees is important for conservation efforts of nest-site limited birds. We provide an integrated pest management approach to "push" bees away from nest boxes with a repellant insecticide, permethrin, and "pull" them toward pheromone baited swarm traps.
FAQs
The first primer pair defines a broader candidate region, whereas the second pair recognizes a sequence located inside the initial amplification product. A product must therefore contain both the outer target region and the correct internal sequence to amplify efficiently in the second round. This nested recognition helps distinguish the intended DNA from unrelated amplification products.
Specificity improves because nonspecific products generated during the first round generally lack the correctly positioned binding sites required by the internal primers. Only products containing the appropriate internal sequence are efficiently carried forward. This additional sequence check is particularly valuable when complex samples contain DNA that could otherwise produce weak or ambiguous amplification signals.
The added amplification capacity is most useful when the target DNA is present at low abundance. In infection research, this may support detection of pathogen genomes that are difficult to identify in complex clinical or environmental samples. Greater sensitivity can make otherwise weak molecular evidence more suitable for downstream pathogen identification or infection studies.
Conventional PCR uses one primer pair to generate and identify an amplified region, while Nested PCR adds a second internal amplification step. That extra targeting can improve discrimination when the initial reaction is weak or contains nonspecific products. Consequently, the nested approach may clarify whether a detected signal corresponds to the intended pathogen or genetic target.
The workflow begins by amplifying the broader target region with the first primer pair. A portion of that initial amplification product then serves as the template for a second reaction using primers directed at an internal sequence. The resulting product reflects both rounds of target selection, increasing confidence in detection when the initial result is uncertain.
Researchers may select this approach when they need to detect a low-abundance pathogen genome or resolve an ambiguous result from conventional PCR. Its two-stage targeting is relevant to pathogen identification, infection-focused molecular studies, and analysis of clinical or environmental samples in which complex DNA backgrounds can make target detection difficult.
A successful nested amplification can provide evidence that a specific pathogen genome or immune-related genetic target is present in the tested sample. The improved target discrimination supports molecular investigation of infection and pathogen identity, especially when conventional amplification produces weak or unclear findings. The method therefore strengthens target detection rather than replacing biological interpretation of the sample.