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Invertrons are genetic elements composed of DNA with inverted terminal repeats at both ends, covalently bonded to terminal proteins involved in the initiation of DNA replication at both their 5' termini when they exist in the cytoplasm of their host in free form. They function as viruses, linear DNA plasmids, transposable elements, and sometimes combinations of two of these properties. They differ from retroviruses and related retro-type transposons which have direct repeats on both their genomic ends and exploit RNA intermediates for replication of their DNA. A model for replication and integration of invertrons is presented, as well as a model for transposition of transposable elements.

microbiological reviews

Invertrons, a class of structurally and functionally related genetic elements that includes linear DNA plasmids, transposable elements, and genomes of adeno-type viruses