Abstract
Site-directed mutagenesis (SDM) is an invaluable technique that enables the manipulation of DNA and therefore the primary structure and function of any encoded gene products. Commercial protocols for SDM have been optimized for Escherichia coli and mean A/T content but may hinder generation of desired products using other templates. Mutagenesis of A/T-rich DNA is often hindered by low oligodeoxynucleotide (oligo)-annealing temperatures, requiring oligos longer than manufacturer protocol recommendations. However, longer oligos can result in primer dimer formation and decreased SDM efficiencies. Commercially available kits proved inefficient at generating AT-rich mutants. We sought to generate a modified protocol that generated SDM products detectable using gel electrophoresis and that did not require an apparent limit on oligo length.
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