Recombination, reassortment, and many-to-one genotypes in natural arenavirus infections

In this study, we documented a surprising degree of genetic diversity in arenavirus-infected snakes. Instead of one or two viral species or quasispecies, individual animals harbored complex populations of viral genotypes composed of up to 5S and 11L genotypes, which replicated as stable ensembles in culture. S and L segment genotype accumulation was not balanced and a particular S segment genotype dominated, both in individual animals and at a population level. Numerous instances of recombination and reassortment were detected. Some recombinant segments had unusual organizations with 2 intergenic regions. This genetic fluidity is closer to that observed in influenza viruses than to the relatively placid genetics of mammalian arenavirus. However, the observed imbalance between the S and L segments and the intrahost accumulation and persistence of multiple genotypes is previously undocumented. Overall, this provides an opportunity to study basic mechanisms of viral adaptation and stretches the idea of what it means to be infected by “a virus”.
Source: New Horizons in Translational Medicine - Category: Research Source Type: research