Molecular evolution of viruses: an interim summary

Area of Science:

• Virology
• Molecular Evolution
• Origins of Life

Background:

• Viruses evolve through changes in RNA and DNA genomes, leading to new mutants.
• The "RNA world hypothesis" suggests early life used RNA, later transitioning to DNA genomes.
• Understanding viral origins is crucial for comprehending evolutionary history.

Purpose of the Study:

• To analyze the evolutionary pathways of RNA, retroviruses, and DNA viruses.
• To investigate current viral genome changes and the emergence of new mutants.
• To establish a timescale for viral evolutionary processes.

Main Methods:

• Review of accumulated published knowledge on the origins of life.
• Analysis of viral genes and molecular processes in infected cells.
• Examination of the impact of viruses on host genomes across diverse organisms.

Main Results:

• Postulated viral evolution from ancient cellular RNA and DNA molecules over 3.5 billion years.
• Identification of two key levels of viral evolution: past pathways and current changes.
• Viruses play a significant role in shaping the genomes of bacteria, plants, mammals, and humans.

Conclusions:

• Studying viruses provides insights into past evolutionary events.
• Viral molecular processes are integral to the evolution of host genomes.
• Predicting future evolutionary trends requires understanding viral impact.