A Quantitative Genetic Interaction Map of HIV Infection

Area of Science:

• Virology
• Genetics
• Immunology

Background:

• Understanding host-pathogen interactions is crucial for developing antiviral therapies.
• Genetic interactions reveal cellular pathways essential for viral replication.

Purpose of the Study:

• To develop a quantitative platform for mapping genetic interactions in viral infections.
• To construct a comprehensive viral host-dependency epistasis map (vE-MAP) for HIV.
• To identify novel host factors and pathways critical for HIV infection.

Main Methods:

• Developed a platform for quantitative genetic interaction mapping using viral infectivity as a readout.
• Constructed a vE-MAP of 356 human genes involved in HIV function, involving over 63,000 pairwise genetic perturbations.
• Utilized gene knockouts and functional assays in primary T cells.

Main Results:

• The vE-MAP provides an extensive view of genetic dependencies in HIV infection.
• The CNOT complex (including CNOT1, 10, and 11) was identified as a central player.
• Knockout of CNOT components suppressed HIV infection by upregulating innate immunity pathways.
• IRF7 deletion rescued the HIV suppression phenotype, uncovering a novel host signaling pathway.

Conclusions:

• The vE-MAP is a powerful tool for identifying drug targets and studying viral mutations.
• The CNOT complex and the IRF7-mediated pathway are critical for HIV pathogenesis.
• The vE-MAP platform is adaptable for studying diverse viral infections and host-pathogen interactions.