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Envelope gene evolution and HIV-1 neuropathogenesis.

Fabián J Vázquez-Santiago1, Vanessa Rivera-Amill1

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Journal of Neuroinfectious Diseases
|May 3, 2016
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Summary

Human immunodeficiency virus type 1 (HIV-1) envelope evolution in the central nervous system (CNS) contributes to HIV-associated neurocognitive disorders (HAND). Understanding this evolution is crucial for developing new therapies to manage CNS infections.

Keywords:
HIVHIV-associated neurocognitive disordersenvelopeviral evolution

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Area of Science:

  • Neurovirology
  • Viral Evolution
  • Immunology

Background:

  • HIV-associated neurocognitive disorders (HAND) affect 40-56% of HIV+ individuals, even with combined antiretroviral therapy (cART).
  • HIV-1 invades the central nervous system (CNS) early in infection, with viral evolution in the CNS influencing disease progression.
  • Distinct chemokine receptor expression in the CNS creates selective pressure on the invading HIV-1.

Purpose of the Study:

  • To review the role of HIV-1 envelope (env) evolution in HAND pathogenesis.
  • To examine the impact of cART on viral evolution dynamics within the CNS.
  • To highlight the need for understanding HIV-1 env evolution for future therapeutic strategies.

Main Methods:

  • Literature review of studies investigating HIV-1 env evolution in the CNS.
  • Analysis of HIV-1 env sequences from brain and cerebrospinal fluid (CSF) of HIV+ subjects.
  • Examination of the relationship between env evolution, neurocognitive status, and cART treatment.

Main Results:

  • HIV-1 env sequences from impaired subjects show higher variability.
  • Env evolution facilitates immune evasion, reduced chemokine receptor dependence, enhanced co-receptor binding, and increased neurotoxicity.
  • Env evolution occurs independently of disease severity and may be pivotal in HAND etiology.

Conclusions:

  • HIV-1 env evolution in the CNS is a critical factor in HAND development and progression.
  • Understanding viral evolution is essential for developing therapies to control CNS viral burden and eradicate reservoirs.
  • cART impacts viral evolution dynamics, but latent reservoirs remain a challenge.