Overview
Nested Polymerase Chain Reaction (PCR) is a technique that is used to detect and amplify target DNA sequences with high accuracy and specificity. It is a modification of the conventional PCR, where two rounds of amplification are performed instead of one. It is commonly used in molecular biology research, medical diagnosis, and forensic science. The nested PCR method involves the use of two sets of primers, the outer or first set of primers amplifies the target DNA in the first round, and the inner or second set of primers amplifies a smaller region of the target sequence in the second round of amplification. The nested primer design prevents the amplification of non-specific DNA products that may interfere with the diagnosis. Nested PCR is a powerful tool for analyzing small amounts of DNA since the second round of amplification increases the sensitivity and specificity of the PCR method, by reducing non-specific amplification products. This technique is useful in detecting low-level infections, where the presence of the target DNA sequence is too low to be detected by the conventional PCR method. Nested PCR has a wide range of applications in forensic science, where it can be used to detect and amplify small amounts of DNA samples from crime scenes. It is also valuable in medical diagnosis, where it is used to detect viral infections, genetic disorders, and cancer diagnoses. In conclusion, nested PCR is a valuable tool for detecting and amplifying target DNA sequences with high accuracy and specificity. The use of two sets of primers reduces the chances of false-positive results and improves the sensitivity and specificity of the PCR method. The nested PCR has revolutionized the field of molecular biology and medical diagnosis.