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Related Concept Videos

Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Immunodeficiency Diseases01:25

Immunodeficiency Diseases

Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
There are three main causes of immunodeficiency disorders...
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...
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.
NK Cells
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Related Experiment Video

Updated: Jun 20, 2026

A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
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A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses

Published on: August 31, 2014

Human immunodeficiency virus, restriction factors, and interferon.

Stuart Neil1, Paul Bieniasz

  • 1Department of Infectious Disease, King's College London School of Medicine, Guy's Hospital, London, United Kingdom.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|August 22, 2009
PubMed
Summary

Mammals possess genetic "restriction factors" that fight retroviral infections, forming an intrinsic immune defense. These factors evolve rapidly, offering potential for new therapies against retroviral diseases.

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A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
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Area of Science:

  • Virology
  • Immunology
  • Genetics
  • Evolutionary Biology

Background:

  • Retroviruses exhibit complex interactions with host organisms.
  • Mammals, including humans, possess genes encoding restriction factors that confer resistance to retroviral infection.
  • These antiretroviral genes function as an intrinsic immune system or an extension of innate immunity.

Purpose of the Study:

  • To explore the complexity of host-retrovirus interactions.
  • To highlight the role of genetic restriction factors in antiviral defense.
  • To understand the evolutionary dynamics and mechanisms of restriction factors.

Main Methods:

  • Analysis of genetic data related to retroviral restriction factors.
  • Comparative genomics to study evolutionary patterns in primates.
  • Investigation of molecular mechanisms underlying restriction factor activity and retroviral evasion.

Main Results:

  • Discovery of numerous host restriction factors providing resistance to retroviral infection.
  • Identification of rapid evolutionary rates for these factors, especially in primates.
  • Accumulating evidence on how restriction factors impede retroviral replication and how viruses counteract them.

Conclusions:

  • Host restriction factors represent a critical defense against retroviral pathogens.
  • The rapid evolution of these factors suggests ongoing evolutionary arms races between hosts and viruses.
  • Understanding these interactions can lead to novel therapeutic strategies for retroviral infections and improved disease models.