Quantification of HIV DNA Using Droplet Digital PCR Techniques

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Human Immunodeficiency Virus (HIV) establishes persistent reservoirs in long-lived cells, hindering curative efforts despite effective antiretroviral therapy.
• Integration of viral DNA into the host genome is crucial for HIV replication and persistence, with the proviral state regulated by host factors.
• The composition of the HIV proviral landscape during therapy is largely unknown, with many integrated proviruses being defective.

Purpose of the Study:

• To present a method for quantifying total HIV DNA using digital PCR.
• To enable the assessment of the proviral landscape and its composition during HIV therapy.
• To provide a tool for investigating mechanisms of HIV persistence.

Main Methods:

• Isolation of total genomic DNA from patient-derived cells.
• Utilizing droplet digital PCR (dPCR) for absolute quantification of HIV DNA targets.
• Partitioning PCR reactions into approximately 20,000 droplets for endpoint amplification and analysis.

Main Results:

• Digital PCR allows for the absolute quantification of various HIV gene targets.
• The abundance of different HIV gene targets reflects the overall proviral composition.
• Copy number is calculated using Poisson correction, providing precise measurements.

Conclusions:

• Digital PCR is a valuable method for quantifying total HIV DNA and understanding the proviral landscape.
• This technique aids in investigating HIV persistence and the composition of viral reservoirs.
• The methodology can be adapted for absolute quantification of other DNA targets.