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The Origin of Virions and Virocells: The Escape Hypothesis Revisited

  • Patrick Forterre
  • Mart Krupovic
Chapter

Abstract

Three types of hypotheses have been proposed to explain the origin of viruses: the “virus first” hypothesis in which viruses originated before cells, the “regression hypothesis”, in which cells or proto-cells evolved into virions by regressive evolution and the “escape hypothesis”, in which fragments of cellular genomes (either from prokaryotes or eukaryotes) became infectious. We will try to show how accumulating data in structural biology combined to new virus definitions allow rejecting the first two hypotheses, favouring a new version of the escape hypothesis. The first viruses probably originated in a world of cells already harbouring ribosomes (ribocells), but well before the Last Universal Common Ancestor of modern cells (LUCA). Several viral lineages originated independently by transformation of ribocells into virocells (cells producing virions). Viral genomes originated from ancestral chromosomes of ribocells and virions from micro-compartments, nucleoprotein complexes or membrane vesicles present in ancient ribocells. Notably, this updated version of the escape hypothesis suggests a working program to tackle the question of virus origin.

Keywords

Viral Genome Hepatitis Delta Virus Viral Lineage Modern Cell dsDNA Virus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Institut PasteurParisFrance
  2. 2.Institut de Génétique MicrobiologieUniv Paris-Sud, CNRS UMR8621Orsay, CedexFrance

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