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Death and the retrovirus.

Jean-Pierre Vartanian1, Peter Sommer, Simon Wain-Hobson

  • 1Unité de Rétrovirologie Moléculaire, Institut Pasteur, 28 rue du Dr Roux, 75724 cedex 15, Paris, France.

Trends in Molecular Medicine
|October 15, 2003
PubMed
Summary

Human immunodeficiency virus (HIV) reverse transcription is susceptible to lethal G-to-A hypermutation. The HIV viral infectivity factor protein prevents this host cell defense mechanism, allowing viral replication.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Human immunodeficiency virus (HIV) replication involves reverse transcription, a critical step for viral genome propagation.
  • Host cell defense mechanisms can interfere with viral replication processes, impacting viral load and infectivity.
  • The apolipoprotein B editing complex protein 3G (APOBEC3G) is a known host factor involved in innate immunity against retroviruses.

Purpose of the Study:

  • To investigate the impact of APOBEC3G-mediated G-to-A hypermutation on HIV reverse transcription.
  • To elucidate the mechanism by which HIV circumvents APOBEC3G-induced lethality during viral replication.

Main Methods:

  • Analysis of newly synthesized viral DNA to detect G-to-A hypermutation patterns.
  • Investigation of the role of the HIV viral infectivity factor (VIF) protein in counteracting APOBEC3G activity.
  • Studies on the cellular localization and incorporation of APOBEC3G into viral particles.

Main Results:

  • HIV reverse transcription was found to be highly vulnerable to G-to-A hypermutation.
  • Cytidine bases in nascent viral DNA are targeted for lethal editing by APOBEC3G.
  • The HIV VIF protein effectively prevents APOBEC3G from entering the virion, thereby circumventing the hypermutation-induced death mechanism.

Conclusions:

  • APOBEC3G acts as a potent host restriction factor against HIV by inducing lethal G-to-A hypermutation during reverse transcription.
  • The HIV VIF protein is essential for viral survival, as it antagonizes APOBEC3G and allows for successful viral replication.
  • Understanding this viral-host interaction provides insights into HIV pathogenesis and potential therapeutic targets.

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