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Position effects influence HIV latency reversal.

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Understanding HIV latency is key to a cure. New methods show HIV expression and treatment response depend on where the virus inserts into the host genome, guiding future HIV cure strategies.

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Area of Science:

  • Virology
  • Genomics
  • Immunology

Background:

  • Latent HIV proviruses are a major barrier to curing HIV infection.
  • The genomic location of integrated HIV may influence viral latency and reactivation.

Purpose of the Study:

  • To develop a method for mapping HIV proviral DNA integration sites and their transcriptional activity.
  • To investigate how the genomic context affects HIV expression and response to latency-reversing agents.

Main Methods:

  • Developed Barcoded HIV ensembles (B-HIVE) to map thousands of proviral locations and transcriptional states simultaneously.
  • Analyzed HIV expression patterns relative to genomic features like endogenous enhancers.
  • Assessed the impact of insertion site on proviral reactivation by phytohemagglutinin and vorinostat in Jurkat cells.

Main Results:

  • HIV expression in Jurkat cells is significantly higher near endogenous enhancers.
  • Proviral reactivation by latency-reversing agents is dependent on the specific genomic insertion site.
  • Distinct genomic locations showed differential responses to phytohemagglutinin and vorinostat.

Conclusions:

  • The genomic context of integrated HIV is a critical factor determining viral response to reactivation therapies.
  • Combination therapies targeting diverse genomic locations may be necessary for effective HIV latency reversal.
  • Insertion site mapping is crucial for developing successful HIV cure strategies.