An integrated genomics approach towards deciphering human genome codes shaping HIV proviral transcription and fate
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ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE144753 | GEO | 2021/05/05
REPOSITORIES: GEO
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Project description:The restructuring of chromatin architecture following lentiviral integration is not well elucidated. We jointly interrogate (HIV-distal & -local) chromatin organization (via Hi-C & ATAC-seq) and the RNA landscape around defined sites of proviral integration using HIV-inducible cellular models. We report chromatin interaction networks and nuclear ultrastructure around integrated HIV-1 are predominantly preserved, suggesting HIV integration does not induce large scale remodeling of cellular chromatin. Instead, we find that induction of proviral transcription leads to stark local changes in nucleosome organization with chromatin accessibility increasing at the intergenic junction between the HIV-1 3’ LTR and flanking cellular genome. This result suggests subtle changes in chromatin structure may be mediating proviral activation. Using long-read Nanopore RNA-seq, we interrogate the local host & HIV transcriptomes, observing a small fraction of HIV-1 transcripts are chimeric read-through products, where transcription initiates at the HIV-1 5’ LTR promoter and continues extensively into the flanking cellular genome. Despite provirus-driven read-through, HIV-1 appears to have only a modest effect on the local transcriptional environment. The changes in chromatin accessibility and read-through at activated proviruses closely resembles lytic Herpes simplex virus type 1 (HSV-1) induced cellular chromatin reprogramming. We propose chromatin “opening” at the 3’ LTR HIV-host junction is important for sustained proviral activity, and overall, HIV proviruses do not significantly alter local host transcription and chromatin structure. Our studies provide the first in-depth integrative investigation of 3D chromatin organization, nucleosome density, and HIV-host transcriptomes at HIV-host genic boundaries.
2021-10-26 | GSE184345 | GEO
Project description:The reservoir of latently HIV-1 infected cells is heterogeneous. To achieve an HIV-1 cure the reservoir of activatable proviruses should be removed, whereas permanently silenced proviruses may be tolerated. We have developed a method to assess the proviral nuclear microenvironment in single cells. Latently HIV-1 infected cells were transduced with a zinc finger protein specifically binding to the HIV-1 promoter, producing a fluorescent signal as the viral transactivator Tat is recruited to the HIV-1 promoter. In these cells we assessed the proviral chromatin composition simultaneously with the proviral activation. By linking the Tat promoter recruitment to viral activation, we dissected the mechanisms of HIV-1 reactivation and the consequences of HIV-1 production. A pulse of promoter-associated Tat was identified that contrasts to the continuous production of viral proteins. As expected, promoter H3K4me3 led to massive expression of the provirus following T cell stimulation. However, the activation induced cell cycle arrest and death resulted in an expanded surviving cell fraction with proviruses encapsulated in repressive chromatin. Further, this model can be used to reveal mechanisms of action of small molecules. In a proof-of-concept study we determine the effect of CBP/P300-inhibitor GNE049. We found that only active enhancers, associated with H3K4me1 and H3K27ac, efficiently recruit Tat, as GNE049 that specifically inhibits enhancer H3K27ac also depletes promoter Tat. Despite the absence of Tat, HIV-1 latency reversal still occurred. Single cell assessment of the chromatin composition of the latent HIV-1 proviruses revealed how T cell stimulation modulates the proviral activity and the subsequent fate of the infected cell.
2021-10-04 | GSE183275 | GEO
Project description:HIV-1-infected cells that persist despite antiretroviral therapy (ART) are frequently considered ‘‘transcriptionally silent,’’ but active viral gene expression may occur in some cells, challenging the concept of viral latency. Applying an assay for profiling the transcriptional activity and the chromosomal locations of individual proviruses, we describe a global genomic and epigenetic map of transcriptionally active and silent proviral species and evaluate their longitudinal evolution in persons receiving suppressive ART. Using genome-wide epigenetic reference data, we show that proviral transcriptional activity is associated with activating epigenetic chromatin features in linear proximity of integration sites and in their inter- and intrachromosomal contact regions. Transcriptionally active proviruses were actively selected against during prolonged ART; however, this pattern was violated by large clones of virally infected cells that may outcompete negative selection forces through elevated intrinsic proliferative activity. Our results suggest that transcriptionally active proviruses are dynamically evolving under selection pressure by host factors.
2022-01-12 | GSE168337 | GEO
Project description:Human immunodeficiency virus (HIV) infection is a chronic condition, where viral DNA integrates into the genome. The fate of the provirus determines the infection course. Latently infected cells form a persistent, heterogeneous reservoir. The reservoir that reinstates an active infection comprises cells with intact provirus that can be reactivated. We confirmed that latent cells from patients exhibited active transcription throughout the provirus. To find transcriptional determinants, we characterized the establishment and maintenance of latency during proviral chromatin maturation in primary CD4+ T-cells for four months after HIV infection. As heterochromatin (marked with H3K9me3 or H3K27me3) gradually stabilized, the provirus became less accessible and lost activation potential. In a subset of infected cells, active marks (i.e., H3K27ac) remained detectable, even after prolonged proviral silencing. After T-cell activation, the proviral activation occurred uniquely in cells with H3K27ac-marked proviruses. Our observations suggested that, after transient proviral activation, cells were actively returned to latency.
2019-12-16 | GSE121055 | 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 | 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:HIV-1 infection of resting memory CD4+ T cells forms a barrier to curing HIV-1. Identification of immune biomarkers that correlate with HIV-1 reservoir size could aid with assessing efficacy of HIV-1 eradication strategies, especially in pediatric infections where blood sampling is limited. In adults, the immune exhaustion marker PD-1 on central memory CD4+ T cells (Tcm) correlates with HIV-1 reservoir size. Immune correlates of HIV-1 reservoir size are less defined in perinatal infection. Using multi-parameter flow cytometry, we examined immune activation (CD69, CD25, HLA-DR), and exhaustion (PD-1, TIGIT, LAG-3 and TIM-3) markers on CD4+ T cell subsets (naïve (Tn), central memory (Tcm), and a combination (Ttem) of transitional (Ttm) and effector memory (Tem) in 10 children living with HIV-1 (median age 15.9 years; median duration of virologic suppression 7.0 years), in whom HIV-1 reservoir size was determined with both the Intact Proviral HIV-1 DNA assay (IPDA) and the Tat/Rev limiting dilution assay (TILDA). Total HIV-1 DNA in CD4+ T cells was also measured. Correlations between immune activation, and exhaustion markers on T cell subsets with the various markers of proviral reservoir size, and baseline CD4+ T cell transcriptomes were examined. The median total HIV-1 DNA concentration was 211.9 copies per million CD4+ T cells, with a median intact proviral load in individuals with HIV-1 subtype B of 8.0 copies per million CD4+ T cells. Levels of HLA-DR and TIGIT on Ttem were strongly correlated with total HIV-1 DNA (r=0.758, p=0.015) and (r=0.721, p=0.023), respectively, but not with intact proviral load or inducible reservoir size. HIV-1 DNA load was also positively correlated with transcriptional clusters associated with HLA-DR. In contrast, PD-1 expression on Tcm was inversely correlated with both total HIV-1 DNA (r=-0.67, p=0.039) and HLA-DR in Ttem (r=-0.89, p=0.060). Gene expression profiles for HLA-DR and PD-1 were also inversely correlated. In conclusion, with virologically suppressed perinatal HIV-1 infection, HLA-DR and TIGIT on Ttem CD4+ T cells correlate with total HIV-1 DNA, and may serve as immune biomarkers for transcriptionally active proviruses, including defectives persisting on ART.
2023-03-20 | GSE209828 | GEO
Project description:An integrated genomics approach towards deciphering human genome codes shaping HIV proviral transcription and fate
| PRJNA604783 | ENA
Project description:Using novel methods for mapping U/A base pairs in HIV DNA, we find that HIV proviruses within infected monocytes and macrophages contain high levels of U/A base pairs arising from the high levels of dUTP present during reverse transcription in these cells. Although U/A pairs retain the coding information of T/A pairs, they are the substrate for the nuclear uracil base excision repair (UBER) machinery that effectively degrades most of the uracilated viral DNA at the pre-integration stage of infection. Uracilated proviruses that successfully integrate either retain the uracils, undergo U/A T/A repair, or experience catastrophic mutagenesis induced by cytokine stimulated error-prone repair. Uracil is abundant in proviruses isolated from genomic DNA of short-lived blood monocytes, but not T cells, of HIV infected blood donors who show complete drug suppression plasma virus. This suggests that monocytes are recently infected by coming into contact with persistent virus producing cells in one or more tissue reservoirs. Data for HIV lockdown of Illumina libraries of MDM cells post viral infection with and without UDG treatment as compared to HT29-ugi cells treated with RTX.
2016-01-19 | E-GEOD-76091 | biostudies-arrayexpress
Project description:Antiretroviral therapy controls but does not cure HIV-1 infection due to a reservoir of rare CD4 + T cells harboring latent proviruses. Little is known about the transcriptional program of latent cells. Here we report a novel strategy to enrich clones of latent cells carrying intact, replication-competent HIV-1 proviruses from blood based on their expression of unique T cell receptors. Latent cell enrichment enabled single cell transcriptomic analysis of 1,050 CD4 + T cells belonging to expanded clones harboring intact HIV-1 proviruses from 6 different individuals. The analysis revealed that most of these cells are T effector memory cells that are enriched for expression of HLA-DR, HLA-DP, CD74, CCL5, Granzymes A and K, cystatin F, LYAR and DUSP2. We conclude that expanded clones of latent cells carrying intact HIV-1 proviruses persist preferentially in a distinct CD4 + T cell population opening new possibilities for eradication.
2022-06-03 | GSE204756 | GEO