Evolution of the PRD1-adenovirus lineage: a viral tree of life incongruent with the cellular universal tree of life
Woo, A. C.; Gaia, M.; Guglielmini, J.; Da Cunha, V.; Forterre, P.
Show abstract
Double-stranded DNA viruses of the PRD1-adenovirus lineage are characterized by homologous major capsid proteins containing one or two {beta}-barrel domains known as the jelly roll folds. Most of them also share homologous packaging ATPases of the FtsK/HerA superfamily P-loop ATPases. Remarkably, members of this lineage infect hosts from the three domains of life, suggesting that viruses from this lineage could be very ancient and share a common ancestor. Here we analyzed the evolutionary history of these cosmopolitan viruses by inferring phylogenies based on single or concatenated genes. These viruses can be divided into two supergroups infecting either eukaryotes or prokaryotes. The latter can be further divided into two groups of bacterioviruses and one group of archaeoviruses. This viral tree is thus incongruent with the cellular tree of life in which Archaea are closer to Eukarya and more divergent from Bacteria. We discuss various evolutionary scenarios that could explain this paradox.
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