Abstract
Viruses have generally been thought of as infectious agents. New data on mimivirus, however, suggests a reinterpretation of this thought. Earth’s biosphere seems to contain many more viruses than previously thought and they are relevant in the maintenance of ecosystems and biodiversity. Viruses are not considered to be alive because they are not free-living entities and do not have cellular units. Current hypotheses indicate that some viruses may have been the result of genomic reduction of cellular life forms. However, new studies relating to the origins of biological systems suggest that viruses could also have originated during the transition from First to the Last Universal Common Ancestor (from FUCA to LUCA). Within this setting, life has been established as chemical informational system and could be interpreted as a macrocode of multiple layers. The first entity to acquire these features was the First Universal Common Ancestor (FUCA) that evolved to an intermediate ancestral that could be named T-LUCA (Transitional-LUCA) and be equated to Woese’s concept of progenotes. T-LUCA may have remained as undifferentiated subsystems with viruses-like structures. The net result is that both cellular life forms and viruses shared protein synthesis apparatuses. In short, virus is a strategy of life reached by two paths: T-LUCAs like entities and the reduction of cellular life forms.
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We would like to thank FAPERJ (CNE 202.780/2018) for funding FP and he Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and the Programa de Pós-Graduação em Filosófia da Universidade Federal de Santa Catarina for support STF.
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de Farias, S.T., Jheeta, S. & Prosdocimi, F. Viruses as a survival strategy in the armory of life. HPLS 41, 45 (2019). https://doi.org/10.1007/s40656-019-0287-5
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DOI: https://doi.org/10.1007/s40656-019-0287-5