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Innate Sensing of Cell-Free DNA and the Interferon-Mediated Control of HIV In Vivo

Award Number: R56AI172754
ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES
OPDIV: NIH
AWARD CLASS: DISCRETIONARY
AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)
PERIOD OF PERFORMANCE START DATE: 08/23/2022
PERIOD OF PERFORMANCE END DATE: 03/31/2023

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Innate Sensing of Cell-Free DNA and the Interferon-Mediated Control of HIV In Vivo - PROJECT SUMMARY While the advent of antiretroviral therapy (ART) has dramatically reduced the morbidity and mortality associated with HIV infection, a cure is not achieved due to the persistence of latently-infected cells during treatment. Accumulating data suggest that HIV-infected individuals often experience persistent immune dysregulation, chronic inflammation, and accelerated aging even in the setting of ART-mediated viral suppression. These realities have created a pronounced interest in developing strategies to cure HIV infection. Identifying the host molecular determinants of HIV persistence and rebound kinetics following cessation of antiretroviral therapy (ART) will be critical in developing effective strategies to cure HIV infection. We recently applied a comprehensive systems profiling approach to plasma samples from HIV-infected individuals who underwent analytical treatment interruption (ATI), to identify circulating host factors that enable prediction of HIV rebound kinetics following ART interruption, and serve as potential pharmacological targets to promote durable virologic remission in the absence of ART. The host factor exhibiting the strongest statistical association with HIV rebound timing following ART cessation was circulating cell-free DNA (cfDNA) in plasma. Specifically, increased cfDNA abundance in plasma was associated with delayed time-to-rebound. cfDNA, released into circulation during programmed cell death, has been exploited extensively in the realm of clinical oncology (often termed “liquid biopsy”). However, cfDNA remains largely unexplored in the setting of HIV infection. In this R01 proposal, we rigorously explore cfDNA as a biomarker of HIV disease states, and we investigate the molecular and immunologic mechanisms linking cfDNA to viral expression and rebound. Our central hypotheses are that 1) cfDNA reflects the death rate of HIV-infected cells in vivo; and 2) cfDNA promotes an antiviral state in the host (e.g. induction of type I interferon response) which prevents viral rebound. Our project features an investigative team with basic, translational, and clinical expertise, and leverages large collections of clinical samples from well-characterized HIV-infected individuals. In Aim 1, we will apply next-generation sequencing (NGS) approaches to plasma samples from HIV-infected individuals to validate and enhance the prognostic significance of cfDNA as a biomarker of natural HIV control in vivo. In Aim 2, we will evaluate how the uptake and sensing of cfDNA by HIV target cells impacts cell fate and the reactivation and replication of HIV. In Aim 3, we will determine how HIV-associated mitochondrial dysfunction leads to cfDNA extrusion and ultimately induces type I interferon responses that prevent HIV rebound. Our project will advance the development and evaluation of HIV cure strategies.


Issue Date FY	Funding FY	Legal Entity Name	Legal Entity Address	Legal Entity City	Legal Entity State	Legal Entity Zip Code	Legal Entity COUNTY	Legal Entity COUNTRY	Assistance Listing	Award Code	Budget Year	Action Date	Action Type	Action Amount

Issue Date FY: 2024 ( Subtotal = -$121,519 )
2024	2022	VITALANT	9305 E VIA DE VENTURA	SCOTTSDALE	AZ	85258	MARICOPA	USA	Allergy and Infectious Diseases Research	000	1	1/23/2024	NEW	-$121,519
														Subtotal = -$121,519

Issue Date FY: 2023 ( Subtotal = $0 )
2023	2022	VITALANT	6210 E OAK ST	SCOTTSDALE	AZ	85257	MARICOPA	USA	Allergy and Infectious Diseases Research	001	1	3/17/2023	NEW	$0
2023	2022	VITALANT	6210 E OAK ST	SCOTTSDALE	AZ	85257	MARICOPA	USA	Allergy and Infectious Diseases Research	000	1	10/31/2022	NEW	$0
														Subtotal = $0

Issue Date FY: 2022 ( Subtotal = $277,025 )
2022	2022	VITALANT	6210 E OAK ST	SCOTTSDALE	AZ	85257	MARICOPA	USA	Allergy and Infectious Diseases Research	000	1	8/23/2022	NEW	$277,025
														Subtotal = $277,025

Grand Total All Awards = $155,506

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Innate Sensing of Cell-Free DNA and the Interferon-Mediated Control of HIV In Vivo

Award Number: R56AI172754

ORGANIZATION: NATIONAL INSTITUTE OF ALLERGY & INFECTIOUS DISEASES

OPDIV: NIH

AWARD CLASS: DISCRETIONARY

AWARD ACTIVITY TYPE: SCIENTIFIC/HEALTH RESEARCH (INCLUDES SURVEYS)

PERIOD OF PERFORMANCE START DATE: 08/23/2022

PERIOD OF PERFORMANCE END DATE: 03/31/2023

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