Abstract
As a consequence of being diploid, retroviruses have a high recombination rate. Naturally occurring retroviruses contain two repeat sequences (R regions) flanking either end of their RNA genomes, and recombination between these two R regions occurs at a high rate. We deduced that recombination may occur between two sequences within the same RNA molecule (intramolecular) as well as between sequences present within two separate RNA molecules (intermolecular). Intramolecular recombination would usually result in a deletion within the progeny provirus. In this report, we demonstrate that intramolecular recombination between two identical sequences occurred within a chimeric RNA vector. In addition, high rates of recombination between two identical sequences within the same RNA molecule resulted mostly from intramolecular recombination.
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