Insertion

Insertion can be thought of as opposite of deletion mediated by transposase. A transposase will cut the genome at a specific cleveage site creating staggered nicks followed by insertion of transposon or a linear piece of DNA. The gaps in the genome are then reparied and ligated which results in direct repeats bordering the transposon insertion. Note that the insertion in a genome becomes evident by the presence of direct repeats at the edges of inserted genes which are not usually expected to be found in a particular genome or at a particular locus in a genome.

Image taken from: [1]