DNA Polymerase Selection Chart
Several factors govern which polymerase should be used in a given application, including:
Template/product specificity: Is RNA or DNA involved? Is the 3´ terminus at a gap, nick or at the end of the template?
Removal of existing nucleotides: Will the nucleotide(s) be removed from the existing polynucleotide chain as part of the protocol? If so, will they be removed from the 5´ or the 3´ end?
Thermal stability: Does the polymerase need to survive incubation at high temperature or is heat inactivation desirable?
Fidelity: Will subsequent sequence analysis or expression depend on the fidelity of the synthesized products?