2021, Number 3-4
Subtype-Dependent Co-receptor Tropism in Cuban HIV-1–Infected Patients: Implications for Maraviroc Treatment
Language: English
References: 36
Page: 29-36
PDF size: 399.82 Kb.
ABSTRACT
INTRODUCTION Unlike most high-income countries where subtype B viruses predominate, the Cuban HIV-1 epidemic is characterized by a great diversity of subtypes and circulating recombinant forms. Some studies have shown that HIV variants exhibiting a preference for the CXCR4 co-receptor (X4-tropic) could have impacts on disease pathogenesis, with clinical implications for antiviral treatment plans. Determination of HIV co-receptor tropism is crucial for clinicians in deciding whether maraviroc is an appropriate antiviral.OBJECTIVE Characterize V3 sequence variability and its relation to viral tropism across different subtypes circulating in Cuba and explore how this may affect treatment success with maraviroc.
METHODS We designed a cross-sectional study that included 72 plasma samples obtained at the Pedro Kourí Tropical Medicine Institute in Havana, Cuba. We sequenced the C2V3 env region and assessed subtype based both on env and pol sequences; tropism was predicted by Geno2pheno analysis. Additionally, 35 V3-loop Cuban sequences, obtained from a previous study, were incorporated into the analysis. Statistical associations among virological, clinical and epidemiological variables were assessed by a chi-square test.
RESULTS Tropism prediction for 72 variants revealed that CRF19_cpx was associated with dual-tropic R5X4 viruses (p = 0.034). Moreover, when 35 sequences from a former study were added, the association was significant not only for R5X4 (p = 0.019) but also for X4-tropic variants (p = 0.044). Alignment of 107 V3-loop sequences showed wide diversity among the different HIV-1 subtypes circulating in Cuba.
CONCLUSIONS In accordance with G2P, CRF19_cpx is a genetic variant with a high proportion of X4 and R5X4-tropic viruses. The results from the present study suggest that the Cuban recombinant could be a more pathogenic variant and that maraviroc may not be suitable for patients infected with CRF19_cpx.
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