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What are Viruses?00:50

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Viruses and Evolution - Viruses First? A Personal Perspective.

Karin Moelling1,2, Felix Broecker3

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Viruses, the most abundant biological entities, may have played a crucial role in the origin and evolution of life. Their ancient RNA-based forms and gene-sharing capabilities highlight their potential as early life models.

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RNA worldevolutionorigin of liferibozymesviruses

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Area of Science:

  • Astrobiology and Evolutionary Biology
  • Virology and Origin of Life Studies

Background:

  • The discovery of exoplanets has revitalized interest in the origin and evolution of life.
  • Viruses are ubiquitous and abundant, significantly impacting host genomes and evolution, as seen with retroviruses and the mammalian placenta.
  • Contemporary viruses exhibit evolutionary pathways from the RNA world to the DNA-protein world.

Purpose of the Study:

  • To explore the potential roles of viruses in the origin and evolution of life.
  • To discuss viruses as potential early forms of life and drivers of evolution.
  • To examine the evolutionary continuum between non-living and living entities, using viruses as a case study.

Main Methods:

  • Review and discussion of existing scientific literature on viruses, early life, and evolution.
  • Analysis of viral genetic makeup, including retroviral contributions and giant viruses.
  • Comparison of viral evolutionary pathways with other entities like ribozymes, viroids, mitochondria, and bacteria.

Main Results:

  • Viruses demonstrate a wide range of evolutionary strategies, including gene loss and gain, essential for driving evolution.
  • Ancient RNA-based entities like ribozymes and viroids share characteristics with viruses, suggesting a potential link to early life.
  • Giant viruses challenge the definition of life, indicating an evolutionary continuum rather than a strict boundary between living and non-living.

Conclusions:

  • Viruses may represent early forms of life, potentially predating cellular life.
  • The study of viruses provides insights into the fundamental processes of life's origin and evolution.
  • Viruses are critical evolutionary drivers, influencing genomic diversity and adaptation across all domains of life.