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Updated: Jun 25, 2026

Combining Analysis of DNA in a Crude Virion Extraction with the Analysis of RNA from Infected Leaves to Discover New Virus Genomes
Published on: July 27, 2018
Ten reasons to exclude viruses from the tree of life
David Moreira1, Purificación López-García
1Unité d'Ecologie, Systématique et Evolution, UMR CNRS 8,079, Université Paris-Sud, bâtiment 360, 91405 Orsay Cedex, France. david.moreira@u-psud.fr
Abstract:
When viruses were discovered, they were accepted as missing links between the inert world and living organisms. However, this idea was soon abandoned as information about their molecular parasitic nature accumulated. Recently, the notion that viruses are living organisms that have had a role in the evolution of some essential features of cells has experienced a renaissance owing to the discovery of unusually large and complex viruses that possess typical cellular genes. Here, we contend that there is strong evidence against the notion that viruses are alive and represent ancient lineages of the tree of life.
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