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Project description:Sustained, drug-free control of HIV-1 replication is naturally achieved in less than 0.5% of infected persons (“elite controllers”, ECs), despite the presence of a replication-competent viral reservoir. Such an ability to spontaneously maintain undetectable plasma viremia is a major objective of functional cure efforts, yet the characteristics of proviral reservoirs in ECs remain to be determined. Using single-genome, near full-length next-generation sequencing and chromosomal integration site analysis, we here show that proviral reservoirs of ECs frequently consist of oligoclonal to near monoclonal clusters of identical intact proviral sequences. In contrast to persons treated with long-term antiretroviral therapy, intact proviral species from ECs displayed highly distinct chromosomal integration sites in the human genome and were preferentially located in centromeric satellite DNA or in KRAB-ZNF genes on chromosome 19, both of which are associated with heterochromatin features. Moreover, integration sites of intact proviruses from ECs showed increased distance to host transcriptional start sites and accessible chromatin and were enriched for repressive chromatin marks. These data suggest that a distinct proviral reservoir configuration represents a structural correlate of natural viral control, and that quality rather than quantity of viral reservoirs can be an important distinguishing feature for a functional cure of HIV-1 infection. Moreover, failure to detect intact proviral sequences despite analyzing > 1.5 billion peripheral blood mononuclear cells in one EC raises the possibility that a sterilizing cure of HIV-1 infection, previously only observed following allogeneic hematopoietic stem cell transplantation, may be feasible in rare instances.
2020-06-15 | GSE144332 | GEO
Project description:Sustained, drug-free control of HIV-1 replication is naturally achieved in less than 0.5% of infected persons (“elite controllers”, ECs), despite the presence of a replication-competent viral reservoir. Such an ability to spontaneously maintain undetectable plasma viremia is a major objective of functional cure efforts, yet the characteristics of proviral reservoirs in ECs remain to be determined. Using single-genome, near full-length next-generation sequencing and chromosomal integration site analysis, we here show that proviral reservoirs of ECs frequently consist of oligoclonal to near monoclonal clusters of identical intact proviral sequences. In contrast to persons treated with long-term antiretroviral therapy, intact proviral species from ECs displayed highly distinct chromosomal integration sites in the human genome and were preferentially located in centromeric satellite DNA or in KRAB-ZNF genes on chromosome 19, both of which are associated with heterochromatin features. Moreover, integration sites of intact proviruses from ECs showed increased distance to host transcriptional start sites and accessible chromatin and were enriched for repressive chromatin marks. These data suggest that a distinct proviral reservoir configuration represents a structural correlate of natural viral control, and that quality rather than quantity of viral reservoirs can be an important distinguishing feature for a functional cure of HIV-1 infection. Moreover, failure to detect intact proviral sequences despite analyzing > 1.5 billion peripheral blood mononuclear cells in one EC raises the possibility that a sterilizing cure of HIV-1 infection, previously only observed following allogeneic hematopoietic stem cell transplantation, may be feasible in rare instances.
2020-06-15 | GSE144329 | GEO
Project description:A unique viral reservoir landscape associated with durable natural control of HIV-1 infection
| PRJNA603379 | ENA
Project description:A unique viral reservoir landscape associated with durable natural control of HIV-1 infection [RNA-seq]
| PRJNA603384 | ENA
Project description:A unique viral reservoir landscape associated with durable natural control of HIV-1 infection [ATAC-seq]
| PRJNA603385 | ENA
Project description:A small proportion of human immunodeficiency virus-1 (HIV-1) infected individuals, termed HIV-1 controllers, suppress viral replication to very low levels in the absence of therapy. Genetic investigations of this phenotype have strongly implicated variation in the class I major histocompatibility complex (MHC) region as key to HIV-1 control. We collected sequence-based classical class I HLA genotypes at 4-digit resolution in HIV-1-infected African American controllers and progressors (n = 1107), and tested them for association with host control using genome-wide single nucleotide polymorphism data to account for population structure. Several classical alleles at HLA-B were associated with host control, including B*57:03 [odds ratio (OR) = 5.1; P= 3.4 × 10(-18)] and B*81:01 (OR = 4.8; P= 1.3 × 10(-9)). Analysis of variable amino acid positions demonstrates that HLA-B position 97 is the most significant association with host control in African Americans (omnibus P = 1.2 × 10(-21)) and explains the signal of several HLA-B alleles, including B*57:03. Within HLA-B, we also identified independent effects at position 116 (omnibus P= 2.8 × 10(-15)) in the canonical F pocket, position 63 in the B pocket (P= 1.5 × 10(-3)) and the non-pocket position 245 (P= 8.8 × 10(-10)), which is thought to influence CD8-binding kinetics. Adjusting for these HLA-B effects, there is evidence for residual association in the MHC region. These results underscore the key role of HLA-B in affecting HIV-1 replication, likely through the molecular interaction between HLA-B and viral peptides presented by infected cells, and suggest that sites outside the peptide-binding pocket also influence HIV-1 control.
| S-EPMC3441117 | biostudies-literature
Project description:Estimating the size of the viral reservoir is critical for HIV cure strategies. Biomarkers in peripheral circulation may give insights into the establishment of the viral reservoir in compartments not easily accessible. We therefore measured systemic levels of 84 soluble biomarkers belonging to a broad array of immune pathways in acute HIV infection in both antiretroviral therapy-naive (ART-naive) individuals as well as individuals who began ART upon early detection of HIV infection. These biomarkers were measured longitudinally during acute and chronic infection and their relationship to viral reservoir establishment and persistence was assessed. We observed several distinct biomarker pathways induced following HIV infection such as IFN-γ-signaled chemokines, proinflammatory markers, and TNF-α-family members. Levels of several of these factors directly correlated with contemporaneous viral loads and/or frequency of peripheral blood mononuclear cells harboring HIV DNA during acute HIV infection. MCP-1, MIP-3β, sTNFR-II, and IL-10 levels prior to ART associated with HIV DNA levels after 96 weeks of treatment, suggesting a link between early immune signaling events and the establishment and persistence of the viral reservoir during ART. Furthermore, they offer potentially novel tools for gaining insight into relative reservoir size in acutely infected individuals and the potential of associated risks of treatment interruption.
| S-EPMC6018979 | biostudies-literature
Project description:Major histocompatibility complex class I (MHC-I)-restricted immune responses are largely attributed to cytotoxic T lymphocytes (CTLs). However, natural killer (NK) cells, as predicted by the missing-self hypothesis, have opposing requirements for MHC-I, suggesting that they may also demonstrate MHC-I-restricted effects. In mice, the Ly49 inhibitory receptors prevent NK cell killing of missing-self targets in effector responses, and they have a proposed second function in licensing or educating NK cells via self-MHC-I in vivo. Here we show MHC-I-restricted control of murine cytomegalovirus (MCMV) infection in vivo that is NK cell dependent. Using mice lacking specific Ly49 receptors, we show that control of MCMV requires inhibitory Ly49 receptors and an inhibitory signaling motif and the capacity for MCMV to downregulate MHC-I. Taken together, these data provide definitive evidence that the inhibitory receptors are required for missing-self rejection and are relevant to MHC-I-restricted NK cell control of a viral infection in vivo.
| S-EPMC7458139 | biostudies-literature
Project description:BackgroundEarly treatment of acute HIV infection with highly active antiretroviral therapy, followed by supervised treatment interruption (STI), has been associated with at least transient control of viremia. However, the durability of such control remains unclear. Here we present longitudinal follow-up of a single-arm, open-label study assessing the impact of STI in the setting of acute HIV-1 infection.Methods and findingsFourteen patients were treated during acute HIV-1 infection and subsequently subjected to an STI protocol that required retreatment if viral load exceeded 50,000 RNA copies/ml plasma or remained above 5,000 copies/ml for more than three consecutive weeks. Eleven of 14 (79%) patients were able to achieve viral loads of less than 5,000 RNA copies/ml for at least 90 d following one, two, or three interruptions of treatment. However, a gradual increase in viremia and decline in CD4+ T cell counts was observed in most individuals. By an intention-to-treat analysis, eight (57%), six (43%), and three (21%) of 14 patients achieved a maximal period of control of 180, 360, and 720 d, respectively, despite augmentation of HIV-specific CD4+ and CD8+ T cell responses. The magnitude of HIV-1-specific cellular immune responses before treatment interruption did not predict duration of viremia control. The small sample size and lack of concurrent untreated controls preclude assessment of possible clinical benefit despite failure to control viremia by study criteria.ConclusionsThese data indicate that despite initial control of viremia, durable viral control to less than 5,000 RNA copies/ml plasma in patients following treated acute HIV-1 infection occurs infrequently. Determination of whether early treatment leads to overall clinical benefit will require a larger and randomized clinical trial. These data may be relevant to current efforts to develop an HIV-1 vaccine designed to retard disease progression rather than prevent infection since they indicate that durable maintenance of low-level viremia may be difficult to achieve.
| S-EPMC524377 | biostudies-literature
Project description:Polymorphism in the HLA region of a chromosome is the major source of host genetic variability in HIV-1 outcome, but there is limited understanding of the mechanisms underlying the beneficial effect of protective class I alleles such as HLA-B57, -B27, and -B51. Taking advantage of a unique cohort infected with clade B' HIV-1 through contaminated blood, in which many variables such as the length of infection, the infecting viral strain, and host genetic background are controlled, we performed a comprehensive study to understand HLA-B51-associated HIV-1 control. We focused on the T cell responses against three dominant HLA-B51-restricted epitopes: Gag327-345(NI9) NANPDCKTI, Pol743-751(LI9) LPPVVAKEI, and Pol283-289(TI8) TAFTIPSI. Mutations in all three dominant epitopes were significantly associated with HLA-B51 in the cohort. A clear hierarchy in selection of epitope mutations was observed through epitope sequencing. L743I in position 1 of epitope LI9 was seen in most B51(+) individuals, followed by V289X in position 8 of the TI8, and then, A328S, in position 2 of the NI9 epitope, was also seen in some B51(+) individuals. Good control of viral load and higher CD4(+) counts were significantly associated with at least one detectable T cell response to unmutated epitopes, whereas lower CD4(+) counts and higher viral loads were observed in patients who had developed escape mutations in all three epitopes or who lacked T cell responses specific to these epitope(s). We propose that patients with HLA-B51 benefit from having multiple layers of effective defense against the development of immune escape mutations.
| S-EPMC3166850 | biostudies-literature