Despite extensive knowledge of the molecular components involved in HlV-1 transcriptional regulation, there is a critical need to understand how these components interact kinetically to form a regulatory 'switch'that mediates establishment, maintenance, and reactivation of HIV-1 latency at the single-cell level. Our long-term goal is to develop interventions to inhibit or purge latent HIV reservoirs, or alternatively, direct all replicating HIV to enter a latent state. The objective of this particular project is to quantitatively analyze the gene-regulatory circuitry underlying HIV latency and to quantify the effects of drugs on HIV's gene-regulatory circuitry in different primary-cell latency models. Our rationale for this project is that quantitative single-cell imaging of HIV gene expression will enable us to elucidate the gene-regulatory circuitry that controls latency in primary cells just as we were able to eluciate key aspects of the HIV latency circuitry in Jurkat cells. We pioneered the use of single-cell imaging approaches to study the role of stochastic noise in HIV gene expression and our analysis has elucidated that HlV-1 utilizes transcriptional positive feedback via Tat to amplify stochastic fluctuations in HIV gene expression and thereby establish a probabilistic molecular 'switch'between proviral latency and active infection (Weinberger et al. Cell 2005). that host SirT1 dampens fluctuations in Tat feedback (Weinberger &Shenk, PLoS Biology 2007), and that manipulating the feedback strength, in the J-lat latency model, can bias infected cells towards maintaining latency and not reactivating (Weinberger et al. Nature Genetics, 2008). We will employ microfluidic approaches and quantitative time-lapse imaging of HIV gene-expression to quantitatively compare the single-cell level effects of diverse drug candidates upon induction of latent gene expression in different primary-cell models. The resulting analysis will allow different drug candidates to be quantitatively compared in terms of their effect on gene expression in single cells and will guide molecular analyses in other projects within the collaboratory.

Public Health Relevance

The HlV-1 proviral latent reservoir remains the most problematic obstacle facing viral eradication from the patient. Understanding how HIV enters, maintains, and breaks latency is critical to designing effective interventions that can eradicate HIV. This project will develop models of HIV latency and test the effect of drugs intended to inhibit HIV latency.

National Institute of Health (NIH)
National Institute of Allergy and Infectious Diseases (NIAID)
Research Program--Cooperative Agreements (U19)
Project #
Application #
Study Section
Special Emphasis Panel (ZAI1-JBS-A (M1))
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
University of North Carolina Chapel Hill
Chapel Hill
United States
Zip Code
Davis, Zachary B; Cogswell, Andrew; Scott, Hamish et al. (2016) A Conserved HIV-1-Derived Peptide Presented by HLA-E Renders Infected T-cells Highly Susceptible to Attack by NKG2A/CD94-Bearing Natural Killer Cells. PLoS Pathog 12:e1005421
Imaz, Arkaitz; Martinez-Picado, Javier; Niubó, Jordi et al. (2016) HIV-1-RNA Decay and Dolutegravir Concentrations in Semen of Patients Starting a First Antiretroviral Regimen. J Infect Dis 214:1512-1519
Honeycutt, Jenna B; Wahl, Angela; Baker, Caroline et al. (2016) Macrophages sustain HIV replication in vivo independently of T cells. J Clin Invest 126:1353-66
Tokarev, Andrey; Stoneham, Charlotte; Lewinski, Mary K et al. (2016) Pharmacologic Inhibition of Nedd8 Activation Enzyme Exposes CD4-Induced Epitopes within Env on Cells Expressing HIV-1. J Virol 90:2486-502
Victor Garcia, J (2016) Humanized mice for HIV and AIDS research. Curr Opin Virol 19:56-64
Smith, Davey M; Nakazawa, Masato; Freeman, Michael L et al. (2016) Asymptomatic CMV Replication During Early Human Immunodeficiency Virus (HIV) Infection Is Associated With Lower CD4/CD8 Ratio During HIV Treatment. Clin Infect Dis 63:1517-1524
Gianella, Sara; Anderson, Christy M; Var, Susanna R et al. (2016) Replication of Human Herpesviruses Is Associated with Higher HIV DNA Levels during Antiretroviral Therapy Started at Early Phases of HIV Infection. J Virol 90:3944-52
Garcia, J Victor (2016) In vivo platforms for analysis of HIV persistence and eradication. J Clin Invest 126:424-31
Lee, Sook-Kyung; Zhou, Shuntai; Baldoni, Pedro L et al. (2016) Quantification of the Latent HIV-1 Reservoir Using Ultra Deep Sequencing and Primer ID In A Viral Outgrowth Assay. J Acquir Immune Defic Syndr :
Wagner, Gabriel A; Chaillon, Antoine; Liu, Siqi et al. (2016) HIV-associated neurocognitive disorder is associated with HIV-1 dual infection. AIDS 30:2591-2597

Showing the most recent 10 out of 187 publications