transposase

A transposase is an enzyme that facilitates the movement of transposons, also known as "jumping genes," within a genome. These genetic elements can relocate to different positions in the DNA.1

Class II transposons, which encode transposase, use a "cut and paste" mechanism. The transposase enzyme cleaves the transposon from its original site and then inserts it into a new location. This process involves cutting both the transposon's ends and the target site in the DNA, followed by the filling in of any gaps by nucleotides.1

While some transposons are considered "selfish" or "junk" DNA due to their parasitic nature and lack of obvious benefit to the host, they can also play roles in genetic regulation and are sometimes associated with diseases like cancer when they disrupt gene activity. Additionally, transposons can carry genes for traits like antibiotic resistance, contributing to their spread among bacteria.1