Related Experiment Video
Updated: Jul 16, 2026
09:00
Polymerase Chain Reaction: Basic Protocol Plus Troubleshooting and Optimization Strategies
Published on: May 22, 2012
Enhancements and modifications of primer design program Primer3.
1Department of Bioinformatics, Institute of Molecular and Cell Biology, University of Tartu, Riia str. 23, Tartu 51010, Estonia.
Bioinformatics (Oxford, England)
|March 24, 2007
Summary
Accurate primer melting temperature (Tm) determination is crucial for PCR success. Enhancements to Primer3 improve Tm calculation by incorporating salt and divalent cation effects, and allowing masked template sequences for better primer design.
Area of Science:
- Molecular Biology
- Bioinformatics
Background:
- Primer3 is a widely used primer design program.
- Accurate determination of annealing temperature is critical for PCR.
- Primer melting temperature (Tm) is a key parameter for annealing temperature calculation.
Purpose of the Study:
- To introduce enhancements to the Primer3 program for more accurate primer design.
- To improve the calculation of primer melting temperature (Tm) for Polymerase Chain Reaction (PCR).
Main Methods:
- Implemented formula for calculating melting temperature.
- Incorporated salt correction formula.
- Accounted for divalent cations and masked template sequences in primer design.
Main Results:
- New formulas enhance the accuracy of Tm determination.
- Consideration of salt and divalent cations improves PCR primer design.
- Masked template sequences enable more flexible primer selection.
Conclusions:
- The enhanced Primer3 program provides more accurate primer design for PCR.
- Improvements facilitate successful PCR experiments by optimizing annealing temperature.
- Modified versions (mPrimer3) are available for independent use.
Related Concept Videos
01:32PCR
Overview
02:35RACE - Rapid Amplification of cDNA Ends
Rapid Amplification of cDNA Ends, or RACE, is one of the most effective methods to obtain a full-length cDNA from an mRNA sequence between a known internal region to the unknown sequence at the 5’ or 3’ end. The unknown region is cloned in the cDNA by a gene-specific primer that binds the known end, and a hybrid primer that attaches a predefined anchor sequence to the unknown end of the cDNA. The sequence in between is amplified by PCR with an anchor primer and a gene-specific primer.
Since the...
Since the...
01:05Maxam-Gilbert Sequencing
In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
Challenges of the Maxam-Gilbert Method
The...
Challenges of the Maxam-Gilbert Method
The...
01:31Proofreading
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Errors During Replication are Corrected by the DNA Polymerase Enzyme