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A virocentric perspective on the evolution of life
Eugene V Koonin1, Valerian V Dolja
1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA.
Current Opinion in Virology
|July 16, 2013
Summary
Viruses are Earth
Area of Science:
- Virology
- Evolutionary Biology
- Genomics
Background:
- Viruses are ubiquitous and the most abundant biological entities on Earth.
- Viral genetic diversity is vast, potentially exceeding that of cellular organisms.
- Viruses exhibit diverse replication strategies, utilizing RNA or DNA genomes.
Purpose of the Study:
- To elucidate the central role of viruses in the evolution of all life.
- To highlight viral hallmark genes and their significance.
- To examine the coevolutionary dynamics between viruses and host defense systems.
Main Methods:
- Comparative genomics analysis to identify viral hallmark genes.
- Phylogenetic analysis to trace gene exchange between viruses and cellular life.
- Review of existing literature on viral diversity, replication, and coevolution.
Main Results:
- Viruses possess unique hallmark genes absent in cellular life, shared across diverse viral groups.
- Extensive gene exchange occurs between viruses and hosts, with viral genes often integrated into cellular functions.
- Coevolution between viruses and host defense mechanisms is a critical driver of evolutionary innovation.
Conclusions:
- Viruses play a fundamental and indispensable role in the evolution of all cellular life.
- The emergence of genomic parasites is inevitable in evolving replicator systems.
- Understanding viral evolution is key to understanding the broader evolutionary history of life on Earth.
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