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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...
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’...
Mechanisms of Retrovirus-induced Cancers01:51

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...
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
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...
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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...

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Related Experiment Video

Updated: Jun 11, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
14:28

Peptide-based Identification of Functional Motifs and their Binding Partners

Published on: July 1, 2013

HIV-1 pathogenesis.

Mario Stevenson1

  • 1Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Biotech 2, Suite 319, Worcester, Massachusetts 01605, USA. Mario.Stevenson@umassmed.edu

Nature Medicine
|July 2, 2003
PubMed
Summary
This summary is machine-generated.

Understanding why human immunodeficiency virus type 1 (HIV-1) causes disease and remains difficult to eradicate is crucial. Studying the interaction between HIV-1 and its host, and comparing it to nonpathogenic simian immunodeficiency virus (SIV), may offer key insights.

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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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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques

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Last Updated: Jun 11, 2026

Peptide-based Identification of Functional Motifs and their Binding Partners
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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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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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Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques
13:13

Single-cell Quantitation of mRNA and Surface Protein Expression in Simian Immunodeficiency Virus-infected CD4+ T Cells Isolated from Rhesus macaques

Published on: September 25, 2018

Area of Science:

  • Virology
  • Immunology
  • Infectious Diseases

Background:

  • Despite 20 years of progress in human immunodeficiency virus (HIV) research, the mechanisms underlying HIV-1 pathogenesis remain unclear.
  • The complete eradication of HIV-1 infection is an ongoing challenge.
  • Simian immunodeficiency virus (SIV) serves as a valuable comparative model due to its nonpathogenic nature in certain natural hosts.

Purpose of the Study:

  • To investigate the complex interplay between HIV-1 and its host.
  • To elucidate the reasons behind the nonpathogenic nature of SIV in specific primate species.
  • To gain insights that may help address the challenges in HIV-1 eradication.

Main Methods:

  • Comparative analysis of HIV-1 and SIV interactions with host systems.
  • In-depth study of host-pathogen dynamics in natural SIV hosts.
  • Review of existing literature on HIV-1 pathogenesis and SIV nonpathogenicity.

Main Results:

  • The study highlights gaps in understanding HIV-1's pathogenic mechanisms.
  • It identifies the host-SIV relationship as a potential source of answers regarding viral nonpathogenicity.
  • The research underscores the need for further investigation into viral-host interactions.

Conclusions:

  • A comprehensive understanding of HIV-1 pathogenesis requires further exploration of host-virus interactions.
  • Investigating SIV nonpathogenicity offers a promising avenue for discovering strategies to combat HIV-1.
  • Elucidating these interactions is critical for advancing efforts towards HIV-1 eradication.