A novel biomarker signature based on circulating transfer RNA (tRNA) can detect and differentiate HIV-2 infection from HIV-1
- 1Laboratory of Molecular Virology, Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, Maryland, USA
Abstract
HIV-1 and HIV-2 share transmission and replication characteristics, but require clinical differentiation. HIV-2 exhibits lower viral loads and slower disease progression, and most patients remain long-term non-progressors. Differentiation is crucial for selecting appropriate viral load monitoring tests and avoiding ineffective antiretroviral treatments, particularly non-nucleoside reverse transcriptase inhibitors, and certain protease inhibitors that do not work against HIV-2. Increased PrEP use may result in new infections testing negative for viral markers. This study aims to identify circulating tRNA expression profiles that could serve as non-viral biomarkers to detect and differentiate HIV-2 from HIV-1 infections. An initial pilot study analyzed 88 tRNAs in plasma samples from HIV-1- (n = 4) and HIV-2 (n = 4)-infected individuals, plus four healthy controls, using a tRNA-based PCR array for target identification. Eighteen selected tRNAs were further analyzed in a larger independent group of samples: HIV-1 (n = 20), HIV-2 (n = 20), and healthy controls (n = 20) for independent verification. A plasma tRNA diagnostic model was developed from these results and evaluated in 24 independent samples to detect and differentiate HIV-2 from HIV-1 infection. We identified a tRNA-based model (Model-II) containing six differentially expressed tRNAs (Leu-TAA, mt-Asp-GTC, mt-Ala-TGC, mt-Lys-TTT, mt-LeuT-AA, and Gly-CCC-1) that could detect HIV-2 infection and distinguish it from HIV-1 infection and healthy controls with 100% accuracy, sensitivity, and specificity. We also found that other blood-borne viruses such as HTLV, HBV, and HCV had no cross-reactivity with HIV-2, demonstrating that Model-II is specific for HIV-2 infection. This study establishes proof of concept for tRNA expression profiles as HIV diagnostic biomarkers. The tRNA-based Model-II represents a promising diagnostic tool for identifying HIV-2 infection and differentiating it from HIV-1.
IMPORTANCE: HIV-2 infection requires accurate differentiation from HIV-1 to guide appropriate antiretroviral therapy, as HIV-2 exhibits intrinsic resistance to non-nucleoside reverse transcriptase inhibitors and certain protease inhibitors. Current diagnostic challenges include the absence of FDA-approved HIV-2 RNA quantification assays and potential false-negative results in LEVI (low-level viremia with evolving viral infection) syndrome patients on pre-exposure prophylaxis (PrEP), in whom viral markers may be undetectable. We developed a novel diagnostic approach using circulating transfer RNA (tRNA) expression profiles as host-derived, non-viral biomarkers. Our six-tRNA panel (Model-II) achieved 100% accuracy, sensitivity, and specificity in detecting HIV-2 infection while distinguishing it from HIV-1 and other blood-borne viral infections (HTLV, HBV, and HCV). This represents the first tRNA-based diagnostic model for HIV, offering a promising complementary tool for early detection and accurate viral differentiation, particularly in clinical scenarios where traditional viral markers are absent or unreliable.
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BibTeX
@article{biswas2026novel,
title = {{A novel biomarker signature based on circulating transfer RNA (tRNA) can detect and differentiate HIV-2 infection from HIV-1}},
author = {Santanu Biswas and David R. McGivern and Indira K. Hewlett and Krishnakumar Devadas},
journal = {Journal of Clinical Microbiology},
year = {2026},
month = aug,
doi = {10.1128/jcm.00378-26},
url = {https://doi.org/10.1128/jcm.00378-26},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A novel biomarker signature based on circulating transfer RNA (tRNA) can detect and differentiate HIV-2 infection from HIV-1
AU - Santanu Biswas
AU - David R. McGivern
AU - Indira K. Hewlett
AU - Krishnakumar Devadas
PY - 2026
DA - 2026/08/31
JO - Journal of Clinical Microbiology
DO - 10.1128/jcm.00378-26
UR - https://doi.org/10.1128/jcm.00378-26
AB - HIV-1 and HIV-2 share transmission and replication characteristics, but require clinical differentiation. HIV-2 exhibits lower viral loads and slower disease progression, and most patients remain long-term non-progressors. Differentiation is crucial for selecting appropriate viral load monitoring tests and avoiding ineffective antiretroviral treatments, particularly non-nucleoside reverse transcriptase inhibitors, and certain protease inhibitors that do not work against HIV-2. Increased PrEP use may result in new infections testing negative for viral markers. This study aims to identify circulating tRNA expression profiles that could serve as non-viral biomarkers to detect and differentiate HIV-2 from HIV-1 infections. An initial pilot study analyzed 88 tRNAs in plasma samples from HIV-1- (n = 4) and HIV-2 (n = 4)-infected individuals, plus four healthy controls, using a tRNA-based PCR array for target identification. Eighteen selected tRNAs were further analyzed in a larger independent group of samples: HIV-1 (n = 20), HIV-2 (n = 20), and healthy controls (n = 20) for independent verification. A plasma tRNA diagnostic model was developed from these results and evaluated in 24 independent samples to detect and differentiate HIV-2 from HIV-1 infection. We identified a tRNA-based model (Model-II) containing six differentially expressed tRNAs (Leu-TAA, mt-Asp-GTC, mt-Ala-TGC, mt-Lys-TTT, mt-LeuT-AA, and Gly-CCC-1) that could detect HIV-2 infection and distinguish it from HIV-1 infection and healthy controls with 100% accuracy, sensitivity, and specificity. We also found that other blood-borne viruses such as HTLV, HBV, and HCV had no cross-reactivity with HIV-2, demonstrating that Model-II is specific for HIV-2 infection. This study establishes proof of concept for tRNA expression profiles as HIV diagnostic biomarkers. The tRNA-based Model-II represents a promising diagnostic tool for identifying HIV-2 infection and differentiating it from HIV-1. IMPORTANCE: HIV-2 infection requires accurate differentiation from HIV-1 to guide appropriate antiretroviral therapy, as HIV-2 exhibits intrinsic resistance to non-nucleoside reverse transcriptase inhibitors and certain protease inhibitors. Current diagnostic challenges include the absence of FDA-approved HIV-2 RNA quantification assays and potential false-negative results in LEVI (low-level viremia with evolving viral infection) syndrome patients on pre-exposure prophylaxis (PrEP), in whom viral markers may be undetectable. We developed a novel diagnostic approach using circulating transfer RNA (tRNA) expression profiles as host-derived, non-viral biomarkers. Our six-tRNA panel (Model-II) achieved 100% accuracy, sensitivity, and specificity in detecting HIV-2 infection while distinguishing it from HIV-1 and other blood-borne viral infections (HTLV, HBV, and HCV). This represents the first tRNA-based diagnostic model for HIV, offering a promising complementary tool for early detection and accurate viral differentiation, particularly in clinical scenarios where traditional viral markers are absent or unreliable.
SN - 0095-1137
SN - 1098-660X
ER -