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First combine template RNA, primer, dNTP mix, and nuclease-free water in a PCR tube. Then, add an RNase inhibitor and reverse transcriptase to the PCR tube. Next, place the PCR tube into a thermal cycler for one cycle wherein annealing, extending, and inactivating of reverse transcriptase occurs.
Another example of primers being used to enable DNA synthesis is reverse transcription. Reverse transcriptase is an enzyme that uses a template strand of RNA to synthesize a complementary strand of DNA. The DNA polymerase component of reverse transcriptase requires an existing 3' end to begin synthesis. [1]
Example of setup of RT-LAMP in a water bath, requiring inexpensive equipment at the Vienna BioCenter. This method is specifically advantageous because it can all be done quickly in one step. The sample is mixed with the primers, reverse transcriptase and DNA polymerase and the reaction takes place under a constant temperature.
The oligo-dT primer anneals to the poly-adenylated tail of the mRNA to serve as a binding site for the reverse transcriptase to begin reverse transcription. An optimized mixture of oligo-dT and random hexamer primers increases the chance of obtaining full-length cDNA while reducing 5' or 3' bias. [14]
Two-tailed PCR uses a single primer that binds to a microRNA target with both 3' and 5' ends, known as hemiprobes. [11] Both ends must be complementary for binding to occur. The 3'-end is then extended by reverse transcriptase forming a long cDNA. The cDNA is then amplified using two target specific PCR primers.
The protocols for 5' or 3' RACES differ slightly. 5' RACE-PCR begins using mRNA as a template for a first round of cDNA synthesis (or reverse transcription) reaction using an anti-sense (reverse) oligonucleotide primer that recognizes a known sequence in the middle of the gene of interest; the primer is called a gene specific primer (GSP). The ...
The primer is allowed to anneal to the RNA and reverse transcriptase is used to synthesize cDNA from the RNA until it reaches the 5' end of the RNA. By denaturing the hybrid and using the extended primer cDNA as a marker on an electrophoretic gel, it is possible to determine the transcriptional start site .
Template-switching polymerase chain reaction (TS-PCR) is a method of reverse transcription and polymerase chain reaction (PCR) amplification that relies on a natural PCR primer sequence at the polyadenylation site, also known as the poly(A) tail, and adds a second primer through the activity of murine leukemia virus reverse transcriptase. [1]
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