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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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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...

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Interview: HIV-1 Proviral DNA Excision Using an Evolved Recombinase
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Developing strategies for HIV-1 eradication.

Christine M Durand1, Joel N Blankson, Robert F Siliciano

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

Trends in Immunology
|August 8, 2012
PubMed
Summary
This summary is machine-generated.

Highly active antiretroviral therapy (HAART) controls HIV-1 but does not eliminate latent reservoirs. Research is exploring innovative strategies like gene therapy and immune stimulation to achieve a functional cure for HIV-1 infection by targeting these persistent viral reservoirs.

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Area of Science:

  • Virology
  • Immunology
  • Gene Therapy

Background:

  • Highly active antiretroviral therapy (HAART) effectively suppresses Human Immunodeficiency Virus type 1 (HIV-1) replication.
  • Persistent reservoirs of replication-competent HIV-1 remain during HAART, leading to viral rebound upon treatment cessation.
  • Recent advancements in understanding HIV-1 latency and a case of viral eradication have revitalized interest in curative strategies.

Purpose of the Study:

  • To review current and emerging strategies for HIV-1 eradication.
  • To highlight the importance of targeting latent viral reservoirs for a functional cure.
  • To outline future research directions for HIV-1 cure.

Main Methods:

  • Review of recent scientific literature on HIV-1 latency, eradication strategies, and immune control.
  • Discussion of gene therapy and hematopoietic stem cell transplantation as potential curative interventions.
  • Exploration of methods to identify and eliminate latent HIV-1 reservoirs in CD4(+) T cells.

Main Results:

  • HAART suppresses viral replication but does not clear latent HIV-1 reservoirs.
  • Gene therapy and stem cell transplantation are promising, albeit complex, approaches for eradication.
  • Stimulating host immunity and targeting latent virus are key to controlling replication and achieving a cure.

Conclusions:

  • Achieving a cure for HIV-1 requires a multi-faceted approach targeting latent reservoirs.
  • Future research must focus on reconstituting the CD4(+) T cell compartment and eliminating all viral reservoirs.
  • Developing strategies for immune control and reservoir eradication is crucial for a functional HIV-1 cure.