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Related Concept Videos

Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the retrovirus to...
Viral Recombination00:57

Viral Recombination

Cells are sometimes infected by more than one virus at once. When two viruses disassemble to expose their genomes for replication in the same cell, similar regions of their genomes can pair together and exchange sequences in a process called recombination. Alternatively, viruses with segmented genomes can swap segments in a process called reassortment.
Viral Mutations00:36

Viral Mutations

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
Retroviruses02:33

Retroviruses

Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...

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Related Experiment Video

Updated: May 13, 2026

Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
11:28

Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus

Published on: October 7, 2011

Viral information.

Forest Rohwer1, Katie Barott

  • 1Department of Biology, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182 USA.

Biology & Philosophy
|March 14, 2013
PubMed
Summary
This summary is machine-generated.

Life is predominantly viral because viruses, unlike cells, pass on only information, not physical matter. This viral information hypothesis suggests genetic information prioritizes replication over energy efficiency, impacting ecological theories.

Keywords:
EcologyEvolutionInformationPhageVirus

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Last Updated: May 13, 2026

Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus
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Dissecting Host-virus Interaction in Lytic Replication of a Model Herpesvirus

Published on: October 7, 2011

Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors
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Arbovirus Infections As Screening Tools for the Identification of Viral Immunomodulators and Host Antiviral Factors

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08:32

Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production

Published on: March 2, 2014

Area of Science:

  • Virology
  • Evolutionary Biology
  • Biogeochemistry

Background:

  • Viruses are abundant, driving global biogeochemistry and disease.
  • The virosphere, encompassing all viruses, is largely overlooked in ecological and evolutionary theories.
  • Understanding the virosphere is crucial for a complete picture of life and its processes.

Purpose of the Study:

  • To address why the majority of life on Earth is viral.
  • To propose a new theoretical framework, the Viral Information Hypothesis, to explain viral dominance.
  • To re-evaluate existing ecological and evolutionary theories from a viral perspective.

Main Methods:

  • Conceptual analysis of viral replication versus cellular reproduction.
  • Application of principles of physical information, such as Landauer's principle, to viral systems.
  • Development of the Viral Information Hypothesis linking genetic information and energy efficiency.

Main Results:

  • Viruses are unique in that they break down completely during replication, passing only information to the next generation.
  • The Viral Information Hypothesis posits that genetic information replicates at the expense of system energy efficiency.
  • This viral nature provides a fundamental explanation for the prevalence of viruses.

Conclusions:

  • The Viral Information Hypothesis offers a new perspective on life's dominance by viruses.
  • This framework can unify and explain existing ecological and evolutionary theories.
  • Further testing of viral information dynamics is proposed to validate these concepts.