Abstract
Site-specific DNA recombinases can "cut and paste" DNA. For example, they can promote excision of specific DNA segments or insertion of new DNA segments in specific places. However, natural recombinases act only at their cognate recombination sites, so current applications are limited to genetically modified organisms in which these sites have been introduced into the genome. Transposases also catalyze DNA rearrangements; they promote insertion of specific DNA sequences but at nonspecific locations. Applicability of site-specific recombinases and transposases in experimental genetics, biotechnology, and gene therapy would be much wider if they could be re-engineered so as to act specifically at chosen sequences within an organism's natural genome. This review will discuss progress towards the creation of such "designer" recombinases.
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