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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’...
Viruses with RNA Genomes01:29

Viruses with RNA Genomes

RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
LTR Retrotransposons03:08

LTR Retrotransposons

LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...

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Related Experiment Video

Updated: Jul 10, 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

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Triple bypass: complicated paths to HIV escape.

Andrew J McMichael1

  • 1MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford OX3 9DS, UK. andrew.mcmichael@ndm.ox.ac.uk

The Journal of Experimental Medicine
|November 21, 2007
PubMed
Summary

Human immunodeficiency virus (HIV) type 1 uses mutations to evade immune detection. One specific HIV-1 mutation impairs dendritic cell activity, potentially hindering T cell responses and explaining slower AIDS progression in some patients.

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Area of Science:

  • Immunology
  • Virology
  • Genetics

Background:

  • Human immunodeficiency virus (HIV) type 1 effectively evades immune responses, leading to acquired immunodeficiency syndrome (AIDS).
  • Mutations in viral epitopes recognized by cytolytic CD8+ T cells (CTLs) are a key mechanism of immune evasion.
  • Understanding these escape mechanisms is crucial for developing effective HIV-1 therapies.

Discussion:

  • A novel HIV-1 escape mutation has been identified that not only allows the virus to evade CTL recognition but also impairs dendritic cell (DC) function.
  • This impairment of DC activity may have broader consequences, potentially affecting subsequent T cell responses to both the mutated epitope and other viral epitopes.
  • The study elucidates the complete escape mechanism for an immunodominant gag epitope presented by human histocompatibility leukocyte antigen (HLA)-B27.

Key Insights:

  • HIV-1 escape mutations can have dual functions, impacting both direct viral evasion and host immune cell activity.
  • Impaired dendritic cell function due to HIV-1 mutations could compromise the adaptive immune response, affecting viral control.
  • The intricate nature of this specific HIV-1 escape strategy contributes to a slower progression to AIDS in individuals with HLA-B27.

Outlook:

  • Further research into the precise molecular mechanisms linking HIV-1 mutations to DC dysfunction is warranted.
  • Investigating whether similar escape strategies are employed against other HLA types could reveal broader patterns of viral immune evasion.
  • This comprehensive understanding of HIV-1 immune evasion may inform the design of novel therapeutic interventions aimed at restoring or enhancing immune responses against the virus.