Sberna G, Nardacci R, Berno G, Rozera G, Giombini E, Fabeni L, Specchiarello E, Maggi F, Amendola A. Virological characterization of HIV-1 RNA elements detected exclusively through the LTR region by the dual-target Aptima HIV-1 Quant Dx assay in a subset of positive patients.
J Clin Virol 2023;
167:105575. [PMID:
37598634 DOI:
10.1016/j.jcv.2023.105575]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 08/10/2023] [Accepted: 08/14/2023] [Indexed: 08/22/2023]
Abstract
BACKGROUND
In a restricted subset of HIV patients with suppressed viral load (i.e., pol-undetected HIV-RNA), the Aptima HIV-1 Quant Dx Assay (Aptima), a dual-target (pol and LTR) and dual-probe test for viral load (VL) monitoring, can detect HIV-RNA exclusively through amplification of the LTR region.
OBJECTIVES
To analyze the virological characteristics of the HIV-RNA elements detected only through LTR amplification (LTR-e).
STUDY DESIGN
LTR-e isolated from plasma and peripheral blood mononuclear cells (PBMC) were evaluated for their ability to trigger productive infections. Viral pellets morphology and ultrastructural characteristics of PBMC from LTR-e patients were examined by electron microscopy. Plasma LTR-e underwent Sanger sequencing. Exosomes were examined with Aptima for LTR-e content.
RESULTS
In-vitro, LTR-e could not infect PBMC, induce cytopathic effects, or cause syncytia, even at high VL (e.g., >10,000 copies/mL). Under the electron microscope, plasma pellets and PBMC from patients with LTR-e showed atypical vesicles. Sanger sequencing of LTR-e yielded no results. Moreover, in plasma samples, LTR-e were associated with cell debris, never with exosomes.
CONCLUSIONS
Differently from other dual-target but single-probe assays, Aptima unveils VL based only on LTR amplification in some HIV patients. Here, we show that LTR-e represent partial/incomplete/non-canonical transcripts unable to trigger productive infection or transmit HIV-1 infection. The recognition of VL based only on LTR-e in infected individuals is crucial as it allows to avoid inappropriate decisions in the clinical management of HIV patients, such as retesting of VL and switching of ART. Physicians and HIV-RNA dual-target assay manufacturers should consider the important implications of not recognizing this singular type of VL.
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