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Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1
07:32

Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1

Published on: September 5, 2016

HIV integration site selection: targeting in macrophages and the effects of different routes of viral entry

Stephen D Barr1, Angela Ciuffi, Jeremy Leipzig

  • 1Department of Microbiology, University of Pennsylvania School of Medicine, 3610 Hamilton Walk, Philadelphia, 19104-6076, USA.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|May 2, 2006
PubMed

Insights

Human immunodeficiency virus (HIV) DNA integration favors active transcription units in macrophages. Entry route does not influence HIV integration site selection in dividing or nondividing cells.

Area of Science:

  • Virology
  • Molecular Biology
  • Genetics

Background:

  • Understanding HIV DNA integration site selection is crucial for developing effective antiviral therapies.
  • Macrophages, as nondividing cells, offer a unique model to study integration mechanisms distinct from dividing cells.
  • The influence of viral entry pathways on integration site preference remains an area of active investigation.

Purpose of the Study:

  • To investigate HIV DNA integration site selection in primary macrophages, comparing dividing and nondividing cells.
  • To determine if the viral envelope protein influences HIV integration targeting.
  • To analyze the impact of cell division status and entry mechanism on HIV integration.

Main Methods:

  • Sequencing and analysis of 754 unique HIV DNA integration sites in primary macrophages.
  • Comparison of integration site distribution in macrophages versus dividing peripheral blood mononuclear cells (PBMCs) and T cell lines.
  • Comparative analysis of integration sites generated by HIV vectors with different envelope proteins (HIV R5 Env and VSV-G).

Main Results:

  • HIV integration in macrophages is favored within active transcription units (TUs), consistent with findings in other cell types.
  • HIV integration within genes is slightly less favored in macrophages compared to dividing PBMCs or T cell lines.
  • No significant differences in integration site distribution were observed between HIV particles bearing R5 Env or VSV-G envelope proteins.
  • Analysis of published data confirmed that the route of viral entry does not affect integration site selection across various viral envelopes.

Conclusions:

  • HIV integration site selection in macrophages is primarily dictated by transcriptional activity, similar to dividing cells.
  • Cellular context (dividing vs. nondividing) has a minor impact on gene body integration preference.
  • The viral entry mechanism, mediated by different envelope proteins, does not significantly alter HIV integration site selection.

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