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Related Concept Videos

Subviral Agents01:29

Subviral Agents

Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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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...
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Mechanisms of Retrovirus-induced Cancers

Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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Cytomegalovirus Disease

Cytomegalovirus (CMV) disease is caused by human cytomegalovirus, a double-stranded DNA virus of the Herpesviridae family. While primary CMV infection is often asymptomatic in immunocompetent individuals, the virus can cause severe disease in neonates and immunocompromised patients. CMV is the most common cause of congenital viral infection in the United States, and a major pathogen in solid organ and hematopoietic stem cell transplant recipients.CMV is transmitted via bodily fluids, sexual...
What are Viruses?00:50

What are Viruses?

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Related Experiment Video

Updated: May 25, 2026

A Detailed Protocol for Characterizing the Murine C1498 Cell Line and its Associated Leukemia Mouse Model
08:00

A Detailed Protocol for Characterizing the Murine C1498 Cell Line and its Associated Leukemia Mouse Model

Published on: October 14, 2016

Murine leukemia viruses: objects and organisms.

Alan Rein1

  • 1HIV Drug Resistance Program, National Cancer Institute-Frederick, Frederick, MD 21702, USA.

Advances in Virology
|February 8, 2012
PubMed
Summary
This summary is machine-generated.

Murine leukemia viruses (MLVs) are simple retroviruses encoding three key polyproteins for replication. While generally not affecting host cells, MLVs exhibit unique features compared to other retroviral genera.

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Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells
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Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells

Published on: December 4, 2007

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Last Updated: May 25, 2026

A Detailed Protocol for Characterizing the Murine C1498 Cell Line and its Associated Leukemia Mouse Model
08:00

A Detailed Protocol for Characterizing the Murine C1498 Cell Line and its Associated Leukemia Mouse Model

Published on: October 14, 2016

Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells
09:40

Production of Replication-Defective Retrovirus by Transient Transfection of 293T cells

Published on: December 4, 2007

Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Murine leukemia viruses (MLVs) represent a class of simple retroviruses.
  • Prototypical gammaretroviruses encode three essential polyproteins: Gag, Pol, and Env.
  • These polyproteins are crucial for the assembly and infectivity of progeny virus particles.

Purpose of the Study:

  • To elucidate the fundamental structure and replication mechanisms of MLVs.
  • To highlight the distinct characteristics of gammaretroviruses within the broader retroviral landscape.
  • To provide a foundational understanding of MLV biology.

Main Methods:

  • Comparative analysis of retroviral genera.
  • Review of established literature on MLV structure and replication.
  • Examination of polyprotein functions in viral assembly and infection.

Main Results:

  • MLVs encode Gag (structural), Pol (enzymatic: protease, reverse transcriptase, integrase), and Env (fusion) polyproteins.
  • Viral enzymes are essential for particle maturation, reverse transcription, and host cell DNA integration.
  • Env protein mediates viral entry and initiates infection through membrane fusion.

Conclusions:

  • MLVs possess a streamlined retroviral genome, encoding only essential proteins for replication.
  • Productive MLV infection typically does not cause apparent harm to host cells.
  • Significant differences exist between MLVs and other retroviral genera, warranting further investigation.