How does allele specific PCR work?

ASPCR works because an oligonucleotide primer that forms a 3′ mismatch with the DNA template will be refractory to primer extension by Thermus aquaticus DNA polymerase. Therefore, oligonucleotide primers specific for all known alleles can be synthesized and used to detect the alleles in DNAs of unknown genotype.

What is allele specificity?

An allele-specific oligonucleotide (ASO) is a short piece of synthetic DNA complementary to the sequence of a variable target DNA. It is designed (and used) in a way that makes it specific for only one version, or allele, of the DNA being tested.

What determines the specificity of PCR?

Many factors will affect the specificity of PCR, such as the primer purity and sequence, purity of the template DNA, Mg2+ concentration, annealing temperature and other additives such as dimethyl sulfoxide (DMSO), which are frequently included in the PCR mixture.

What is allele specific primer?

Allele Specific Primer Extension (ASPE) is a solution based, sequence specific enzymatic reaction technology that can be used to assay multiple SNPs in a single tube. This is done with the help of an appropriate capture sequence attached to the allele specific oligonucleotide.

What is allele-specific expression?

Allele-specific expression (ASE) refers to the characteristic of preferentially expressing a parental allele in the hybrid due to variations in regulatory sequences from the parental genomes (11). The expression difference caused by ASE may lead to phenotypic variation depending on the function of the genes.

What is allele-specific analysis?

Allele-specific expression (ASE) analysis, which quantifies the relative expression of two alleles in a diploid individual, is a powerful tool for identifying cis-regulated gene expression variations that underlie phenotypic differences among individuals.

How do you increase PCR specificity?

Another way to increase PCR specificity is to increase as much as pos- sible the annealing temperature and/or add formamide to the reaction mix- ture. (z~ Usually, this procedure improves the specificity of the reaction but is not effective when the two primers have dif- ferent annealing temperatures.

What are the steps in polymerase chain reaction?

PCR is based on three simple steps required for any DNA synthesis reaction: (1) denaturation of the template into single strands; (2) annealing of primers to each original strand for new strand synthesis; and (3) extension of the new DNA strands from the primers.

What is anchored PCR?

A variation of the PCR technique, similar to ligation-mediated PCR, that is applied to double-stranded DNA fragments for which the sequence at only one end of the gene is known. The technique allows amplification of a complete sequence of a gene when only the N-terminal sequence of a protein is known.

Can PCR detect DNA methylation?

Methylation-specific PCR (MS-PCR or MSP) is one of the most commonly used methods for gene/sequence-specific detection of DNA methylation. The DNA undergoes bisulfite conversion of cytosine to uracil and then the methylated sequences are selectively amplified with primers specific for methylation.

What is allele-specific PCR (as-PCR)?

Allele-specific polymerase chain reaction (AS-PCR), also known as amplification refractory mutation system (ARMS) or PCR amplification of specific alleles (PASA) is a PCR-based method which can be employed to detect the known SNPs [ 7 ]. The concept of AS-PCR was initiated by Newton et al. [ 8 ], approximately six years after PCR was invented.

What is polymerase chain reaction?

Polymerase Chain Reaction (PCR) Fact Sheet Polymerase chain reaction (PCR) is a technique used to “amplify” small segments of DNA.

What is PCR amplification of DNA?

Sometimes called “molecular photocopying,” the polymerase chain reaction (PCR) is a fast and inexpensive technique used to “amplify” – copy – small segments of DNA. Because significant amounts of a sample of DNA are necessary for molecular and genetic analyses, studies of isolated pieces of DNA are nearly impossible without PCR amplification.

What is the starting point for DNA polymerase?

DNA polymerase also requires a small section of double-stranded DNA to initiate (“prime”) synthesis (Fig. 22.1). Therefore the starting point for DNA synthesis can be specified by supplying an oligonucleotide primer that anneals to the template at that point.