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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...
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Overview
Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
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...
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu01:29

Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu

Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...

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Related Experiment Video

Updated: May 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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HIV controllers: a genetically determined or inducible phenotype?

Asier Sáez-Cirión1, Gianfranco Pancino

  • 1Institut Pasteur, Unité de Régulation des Infections Rétrovirales, Paris, France.

Immunological Reviews
|June 19, 2013
PubMed
Summary

HIV controllers (HICs) are rare patients naturally controlling human immunodeficiency virus-1 (HIV-1) without treatment. Research explores their unique genetic and immune profiles to understand HIV control mechanisms for potential therapeutic applications.

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Area of Science:

  • Immunology
  • Virology
  • Genetics

Background:

  • A small fraction of human immunodeficiency virus-1 (HIV-1)-infected individuals, known as HIV controllers (HICs), spontaneously control viral replication without antiretroviral therapy.
  • HICs present a unique model for investigating host-pathogen interactions and identifying mechanisms of natural viral control.

Purpose of the Study:

  • To review current knowledge on viral and host factors contributing to HIV control.
  • To explore whether the ability to control HIV replication is linked to specific genetic or immunological features in HICs or can be induced in the general population.

Main Methods:

  • Review of existing literature on HIV controllers, including genomic, transcriptomic, and immunological studies.
  • Analysis of data from HICs to identify key factors associated with viral load suppression.
  • Discussion of potential vaccine and therapeutic strategies based on HIC characteristics.

Main Results:

  • Host factors are primary determinants of HIV control, with distinct genomic, transcriptomic, and immunological profiles observed in HICs.
  • Evidence suggests multiple distinct mechanisms contribute to HIV control among different HICs.
  • Research has identified several viral and host factors implicated in the control of HIV replication.

Conclusions:

  • Understanding the specific genetic and immunological features of HICs is crucial for developing effective HIV control strategies.
  • The findings in HICs may inform the development of therapeutic interventions or vaccines to induce viral control in a broader HIV-infected population.