Allele-specific Pcr
Allele-specific Pcr - Related Videos
10:17
An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Cited by 2 •
2010
Genetic associations often remain unexplained at a functional level. This method aims to assess the effect of phenotype-associated genetic markers on gene expression by analyzing cells heterozygous for transcribed SNPs. The technology allows accurate measurement by MALDI-TOF mass spectrometry to quantify allele-specific primer extension products.
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.
02:19
Multiple Allele Traits
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2021
For the same gene multiple alleles can interact to influence phenotypes like the shape and protein composition of an individual cells.By studying allele interactions on the molecular and cellular levels researchers can understand the resulting phenotypes and complications of human conditions like sickle cell trait, improving treatment.The ABO blood group system is a common example of multiple alleles in humans. This system includes three alleles called IA, IB, and i alleles, which combine in...
02:41
Lethal Alleles
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2021
Agouti: A Lethal Allele Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
04:32
Chip-in-a-Tube-Based Digital PCR for Quantification of Single Nucleotide Variants
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2025
This video demonstrates the utility of digital PCR in a chip-in-a-tube format for the detection of single nucleotide variations in DNA samples. A single PCR reaction is partitioned into chambers that act as independent PCR reactions, and the detection of fluorescence signals from the amplified targets in the chambers is used to compute the frequency of the variant allele in the sample.
FAQs
The decisive step in Allele-specific PCR is discrimination at the primer’s 3′ end. DNA polymerase can extend efficiently when that terminal nucleotide matches the template allele, whereas a mismatch prevents or reduces productive amplification under suitable annealing conditions. This converts a single-base sequence difference into a detectable difference in PCR amplification, enabling allele assignment from reaction patterns.
Annealing conditions determine how selectively the primer’s 3′ terminal base is recognized. If conditions are not sufficiently optimized, a primer may fail to amplify its matching allele efficiently or may discriminate less clearly between matching and mismatching templates. Optimization therefore improves the contrast between allele-specific reactions, which is essential for reliable genotyping and mutation detection.
Comparing amplification across allele-specific reactions reveals which allele is supported by the sample’s DNA. A reaction that amplifies with one primer design but not the alternative indicates compatibility with the corresponding sequence at the targeted nucleotide. This comparison turns reaction-specific amplification patterns into genotype information, allowing researchers to distinguish variant and nonvariant alleles in genetic analyses.
An assay begins by selecting primers whose 3′ terminal base corresponds to the allele being tested, then applying the allele-specific reactions to the sample DNA. The reactions are run under annealing conditions that preserve discrimination, and their amplification patterns are compared. Because the approach uses routine PCR equipment, researchers can incorporate it into standard molecular genetics workflows.
Researchers apply Allele-specific PCR when they need to test a defined single-nucleotide variant or mutation. Its speed and sensitivity support clinical genetics, population studies, and molecular research. The technique provides a targeted way to assign samples to alleles, making it useful for investigations focused on known sequence differences rather than general DNA amplification.
In genetics, the resulting allele calls can help identify disease-associated variants and investigate inherited traits. The same amplification-based readout supports genotype comparisons among samples in population studies. These uses connect a single-nucleotide distinction at the DNA level with broader questions about inheritance, variant distribution, and the presence of mutations in research or clinical contexts.