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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...
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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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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.
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Double trouble: HIV latency and CTL escape.

Matthew D Marsden1, Jerome A Zack2

  • 1Department of Medicine, Division of Hematology and Oncology, University of California, Los Angeles, CA 90095, USA.

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Summary

Human immunodeficiency virus (HIV) can persist for decades in a latent state, even with drug treatment. A study reveals this latent reservoir harbors cytotoxic T lymphocyte escape mutants, complicating HIV cure strategies.

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Area of Science:

  • Virology
  • Immunology
  • Infectious Diseases

Background:

  • Human immunodeficiency virus (HIV) establishes lifelong persistence through latent reservoirs in patients undergoing antiretroviral therapy.
  • Understanding the characteristics of the latent HIV reservoir is crucial for developing effective cure strategies.

Purpose of the Study:

  • To investigate the genetic makeup of the latent HIV reservoir.
  • To identify potential obstacles to HIV eradication in treated individuals.

Main Methods:

  • Analysis of viral sequences within the latent reservoir of HIV-infected patients on antiretroviral drugs.
  • Identification and characterization of cytotoxic T lymphocyte (CTL) escape mutations.

Main Results:

  • The latent HIV reservoir contains a substantial proportion of CTL escape mutants.
  • These escape mutants may evade immune responses crucial for viral control.

Conclusions:

  • The presence of CTL escape mutants in the latent reservoir poses a significant challenge to achieving a functional HIV cure.
  • Targeting these immune-evasive viral variants may be necessary for future HIV eradication efforts.