Tracking HIV-1-Infected Cell Clones Using Integration Site-Specific qPCR

Area of Science:

• Virology
• Immunology
• Molecular Biology

Background:

• HIV-1 cure research necessitates precise quantification of the viral reservoir.
• Existing methods like digital droplet PCR cannot distinguish individual replication-competent proviruses (repliclones).
• Tracking specific repliclones is challenging due to their low abundance and the need for complex integration site sequencing.

Purpose of the Study:

• To develop a simplified workflow for quantifying specific HIV-1 repliclones.
• To assess the frequency of intact and defective proviruses within cellular clones.
• To provide a tool for monitoring repliclone dynamics and treatment efficacy.

Main Methods:

• Development and application of integration site-specific quantitative PCR (IS-qPCR).
• Quantification of proviral frequencies in cellular clones from three HIV-1 infected donors.
• Comparison of IS-qPCR results with deep integration site sequencing data.

Main Results:

• IS-qPCR successfully determined the frequencies of specific repliclones and defective proviral clones.
• IS-qPCR estimates of clone frequencies showed strong concordance with deep sequencing data (r = 0.838).
• The new method offers a simpler approach compared to traditional integration site sequencing.

Conclusions:

• Integration site-specific qPCR (IS-qPCR) is a valuable tool for quantifying HIV-1 repliclones.
• IS-qPCR can be applied across multiple samples and cell types to track viral dynamics.
• This method can help evaluate the effectiveness of HIV-1 eradication strategies.