1887

Abstract

The species ) consists of two conventional clusters and one unconventional cluster. At present, sequence analysis shows no evidence of recombination between conventional and unconventional types. However, the factors underlying this genetic barrier are unclear. Here, we systematically dissected the genome components linked to these peculiar phenomena, using the viral reverse genetic tools. We reported that viral capsids of the unconventional types expressed poorly in human cells. The -encapsidation outputs across conventional and unconventional types were also with low efficiency. However, replicons of conventional types bearing exchanged 5′-untranslated region (UTR) or non-structural regions from the unconventional types were replication-competent. Furthermore, we created a viable recombinant EVA71 (conventional type) with its P3 region replaced by that from EVA89 (unconventional type). Thus, our data for the first time reveal the potential for fertile genetic exchanges between conventional and unconventional types. It also discloses that the mysterious recombination barriers may lie in uncoordinated capsid expression and particle assembly by different clusters.

  • This is an open-access article distributed under the terms of the Creative Commons Attribution NonCommercial License.
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2020-08-07
2024-04-26
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