The origin of viruses and their possible roles in major evolutionary transitions

Virus Research
Patrick Forterre

Abstract

Viruses infecting cells from the three domains of life, Archaea, Bacteria and Eukarya, share homologous features, suggesting that viruses originated very early in the evolution of life. The three current hypotheses for virus origin, e.g. the virus first, the escape and the reduction hypotheses are revisited in this new framework. Theoretical considerations suggest that RNA viruses may have originated in the nucleoprotein world by escape or reduction from RNA-cells, whereas DNA viruses (at least some of them) might have evolved directly from RNA viruses. The antiquity of viruses can explain why most viral proteins have no cellular homologues or only distantly related ones. Viral proteins have replaced the ancestral bacterial RNA/DNA polymerases and primase during mitochondrial evolution. It has been suggested that replacement of cellular proteins by viral ones also occurred in early evolution of the DNA replication apparatus and/or that some DNA replication proteins originated directly in the virosphere and were later on transferred to cellular organisms. According to these new hypotheses, viruses played a critical role in major evolutionary transitions, such as the invention of DNA and DNA replication mechanisms, the formation ...Continue Reading

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Related Concepts

Metabolic Process, Cellular
Thymidylate Synthase
CFC1 gene
Tissue Membrane
Vaccinia virus
Ribosomal Proteins
Genome
Enzymes, antithrombotic
Ribonucleotide Reductase
DNA-Directed RNA Polymerase

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