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Shekhar R, O'Grady T, Keil N, Feswick A, Amador DM, Tibbetts S, Flemington E, Renne R. High-density resolution of the Kaposi's sarcoma associated herpesvirus transcriptome identifies novel transcript isoforms generated by long-range transcription and alternative splicing. Nucleic Acids Res 2024; 52:7720-7739. [PMID: 38922687 PMCID: PMC11260491 DOI: 10.1093/nar/gkae540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 05/14/2024] [Accepted: 06/11/2024] [Indexed: 06/28/2024] Open
Abstract
Kaposi's sarcoma-associated herpesvirus is the etiologic agent of Kaposi's sarcoma and two B-cell malignancies. Recent advancements in sequencing technologies have led to high resolution transcriptomes for several human herpesviruses that densely encode genes on both strands. However, for KSHV progress remained limited due to the overall low percentage of KSHV transcripts, even during lytic replication. To address this challenge, we have developed a target enrichment method to increase the KSHV-specific reads for both short- and long-read sequencing platforms. Furthermore, we combined this approach with the Transcriptome Resolution through Integration of Multi-platform Data (TRIMD) pipeline developed previously to annotate transcript structures. TRIMD first builds a scaffold based on long-read sequencing and validates each transcript feature with supporting evidence from Illumina RNA-Seq and deepCAGE sequencing data. Our stringent innovative approach identified 994 unique KSHV transcripts, thus providing the first high-density KSHV lytic transcriptome. We describe a plethora of novel coding and non-coding KSHV transcript isoforms with alternative untranslated regions, splice junctions and open-reading frames, thus providing deeper insights on gene expression regulation of KSHV. Interestingly, as described for Epstein-Barr virus, we identified transcription start sites that augment long-range transcription and may increase the number of latency-associated genes potentially expressed in KS tumors.
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Affiliation(s)
- Ritu Shekhar
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, USA
| | - Tina O'Grady
- Department of Pathology, Tulane University, New Orleans, LA, USA
| | - Netanya Keil
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, USA
- UF Genetics Institute, University of Florida, Gainesville, FL, USA
| | - April Feswick
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, USA
| | - David A Moraga Amador
- UF Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, USA
| | - Scott A Tibbetts
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, USA
- UF Health Cancer Center, University of Florida, Gainesville, FL, USA
- UF Genetics Institute, University of Florida, Gainesville, FL, USA
| | | | - Rolf Renne
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, USA
- UF Health Cancer Center, University of Florida, Gainesville, FL, USA
- UF Genetics Institute, University of Florida, Gainesville, FL, USA
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Wang D, Ruan Z, Wang R, Ma L, Tang S, Wang X, Ma A. Decoding the mechanism of earthworm extract against wounds: an integrated metabolomics and network pharmacology study. Mol Divers 2024; 28:631-647. [PMID: 36705857 DOI: 10.1007/s11030-023-10609-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Accepted: 01/19/2023] [Indexed: 01/28/2023]
Abstract
Earthworms are used to cure wounds in Chinese villages for thousands of years. Recently, scientists realized their extracts could promote wound healing and they have anti-inflammatory, antioxidant, anti-apoptosis, and anti-microbial properties, but its mechanism of promoting wound healing remains unclear. In the presented study, electronic literature databases and LC-MS/MS were used to determine earthworms' ingredients and differential metabolites. Swiss Target Prediction database was used for ingredients' target prediction and wound disease-relevant genes were found from GeneCards, OMIM, and DrugBank databases. Network pharmacology was conducted to demonstrate filtering hub targets, biological functions, and the signaling pathways of earthworms extract against wounds. Molecular docking and metabolism analysis were used to look for core target genes and key bioactive molecules from earthworms. Finally, the investigation shows 5 most important signal pathways, 5 core genes, and 6 bioactive ingredients-related cell-cell adhesion, cell proliferation, and cell migration processes could be affected by earthworms' extract. On 3rd day, the extract could regulate HIF1A and EGFR targets to make the differences of quantities of 4-pyridoxate, tetradecanoic acid, and L-kynurenine. While on 7th day, the regulation refers 6 earthworms' bioactive ingredients, 4 core genes (CTNNB1, EGFR, SRC, and CASP3), and 4 differential metabolites (4-hydoxy-2-quinolinecarboxylic acid, urocanate, deoxyinosine, creatine, and sn-glycerol-3-phosphocholine). on 14th day, 2 core genes (EGFR, SRC) are influenced in the biological processes. Briefly, we found that 6 ingredients from earthworms have most bioactive and 5 core genes play an important role in promoting wound-healing processes. These discovers indicates earthworms could against wound via AGE-RAGE, PI3K-Akt, HIF1A, MAPK, and Axon guidance pathways.
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Affiliation(s)
- Dong Wang
- Medical Research and Experiment Center, Shaanxi University of Chinese Medicine, Xianyang, China.
- Shaanxi Key Laboratory of Research on TCM Physical Constitution and Disease Prevention and Treatment, Xianyang, China.
| | - Zhen Ruan
- Xianyang Central Hospital, Xianyang, China
| | - Ruihui Wang
- Medical Research and Experiment Center, Shaanxi University of Chinese Medicine, Xianyang, China
| | - Li Ma
- Medical Research and Experiment Center, Shaanxi University of Chinese Medicine, Xianyang, China
| | - Saiqing Tang
- Second Clinical Medical School, Shaanxi University of Chinese Medicine, Xianyang, China
| | - Xuejing Wang
- Medical Research and Experiment Center, Shaanxi University of Chinese Medicine, Xianyang, China
| | - Axue Ma
- Second Clinical Medical School, Shaanxi University of Chinese Medicine, Xianyang, China
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Zareie AR, Verma SC. Nucleolin Regulates the Expression of Kaposi's Sarcoma-Associated Herpesvirus' Latency-Associated Nuclear Antigen through G-Quadruplexes in the mRNA. Viruses 2023; 15:2438. [PMID: 38140679 PMCID: PMC10747643 DOI: 10.3390/v15122438] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/08/2023] [Accepted: 12/13/2023] [Indexed: 12/24/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) establishes life-long latent infection and is linked to several human malignancies. Latency-associated nuclear antigen (LANA) is highly expressed during latency, and is responsible for the replication and maintenance of the viral genome. The expression of LANA is regulated at transcriptional/translational levels through multiple mechanisms, including the secondary structures in the mRNA sequence. LANA mRNA has multiple G-quadruplexes (G4s) that are bound by multiple proteins to stabilize/destabilize these secondary structures for regulating LANA. In this manuscript, we demonstrate the role of Nucleolin (NCL) in regulating LANA expression through its interaction with G-quadruplexes of LANA mRNA. This interaction reduced LANA's protein expression through the sequestration of mRNA into the nucleus, demonstrated by the colocalization of G4-carrying mRNA with NCL. Furthermore, the downregulation of NCL, by way of a short hairpin, showed an increase in LANA translation following an alteration in the levels of LANA mRNA in the cytoplasm. Overall, the data presented in this manuscript showed that G-quadruplexes-mediated translational control could be regulated by NCL, which can be exploited for controlling KSHV latency.
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Affiliation(s)
| | - Subhash C. Verma
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, 1664 N Virginia Street, Reno, NV 89557, USA;
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Santiago JC, Westfall DH, Adams SV, Okuku F, Phipps W, Mullins JI. Variation within major internal repeats of KSHV in vivo. Virus Evol 2023; 9:vead034. [PMID: 37325087 PMCID: PMC10266750 DOI: 10.1093/ve/vead034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 05/09/2023] [Accepted: 05/18/2023] [Indexed: 06/17/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiologic agent of Kaposi's sarcoma (KS), yet the viral genetic factors that lead to the development of KS in KSHV-infected individuals have not been fully elucidated. Nearly, all previous analyses of KSHV genomic evolution and diversity have excluded the three major internal repeat regions: the two origins of lytic replication, internal repeats 1 and 2 (IR1 and IR2), and the latency-associated nuclear antigen (LANA) repeat domain (LANAr). These regions encode protein domains that are essential to the KSHV infection cycle but have been rarely sequenced due to their extended repetitive nature and high guanine and cytosine (GC) content. The limited data available suggest that their sequences and repeat lengths are more heterogeneous across individuals than in the remainder of the KSHV genome. To assess their diversity, the full-length IR1, IR2, and LANAr sequences, tagged with unique molecular identifiers (UMIs), were obtained by Pacific Biosciences' single-molecule real-time sequencing (SMRT-UMI) from twenty-four tumors and six matching oral swabs from sixteen adults in Uganda with advanced KS. Intra-host single-nucleotide variation involved an average of 0.16 per cent of base positions in the repeat regions compared to a nearly identical average of 0.17 per cent of base positions in the remainder of the genome. Tandem repeat unit (TRU) counts varied by only one from the intra-host consensus in a majority of individuals. Including the TRU indels, the average intra-host pairwise identity was 98.3 per cent for IR1, 99.6 per cent for IR2 and 98.9 per cent for LANAr. More individuals had mismatches and variable TRU counts in IR1 (twelve/sixteen) than in IR2 (two/sixteen). There were no open reading frames in the Kaposin coding sequence inside IR2 in at least fifty-five of ninety-six sequences. In summary, the KSHV major internal repeats, like the rest of the genome in individuals with KS, have low diversity. IR1 was the most variable among the repeats, and no intact Kaposin reading frames were present in IR2 of the majority of genomes sampled.
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Affiliation(s)
- Jan Clement Santiago
- Department of Microbiology, University of Washington, 960 Republican St, Seattle, WA 98109-4325, USA
| | - Dylan H Westfall
- Department of Microbiology, University of Washington, 960 Republican St, Seattle, WA 98109-4325, USA
| | - Scott V Adams
- Global Oncology and Vaccine and Infectious Diseases Division,Fred Hutchinson Cancer Center, 1100 Eastlake Ave, Seattle, 98109-4487 WA, USA
| | - Fred Okuku
- Uganda Cancer Institute, Upper Mulago Hill Road, Kampala, Uganda
| | - Warren Phipps
- Global Oncology and Vaccine and Infectious Diseases Division,Fred Hutchinson Cancer Center, 1100 Eastlake Ave, Seattle, 98109-4487 WA, USA
- Department of Medicine, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-8070, USA
| | - James I Mullins
- Department of Microbiology, University of Washington, 960 Republican St, Seattle, WA 98109-4325, USA
- Department of Medicine, University of Washington, 1959 NE Pacific St., Seattle, WA 98195-8070, USA
- Department of Global Health, University of Washington, 3980 15th Ave NE, Seattle, WA 98195, USA
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Bennett SJ, Yalcin D, Privatt SR, Ngalamika O, Lidenge SJ, West JT, Wood C. Antibody epitope profiling of the KSHV LANA protein using VirScan. PLoS Pathog 2022; 18:e1011033. [PMID: 36534707 PMCID: PMC9810164 DOI: 10.1371/journal.ppat.1011033] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 01/03/2023] [Accepted: 11/30/2022] [Indexed: 12/23/2022] Open
Abstract
The humoral antibody response against Kaposi sarcoma-associated herpesvirus (KSHV) in infected individuals has been characterized demonstrating the latency-associated nuclear antigen (LANA) as the most antigenic KSHV protein. Despite the antigenicity of the protein, specific LANA epitopes have not been systematically characterized. Here, we utilized a bacteriophage T7 library, which displays 56-amino acid KSHV LANA peptides with 28-amino acid overlap (VirScan), to define those epitopes in LANA targeted by antibodies from a cohort of 62 sub-Saharan African Kaposi sarcoma (KS) patients and 22 KSHV-infected asymptomatic controls. Intra- and inter-patient breadth and magnitude of the anti-LANA responses were quantified at the peptide and amino acid levels. From these data, we derived a detailed epitope annotation of the entire LANA protein, with a high-resolution focus on the N- and C-termini. Overall, the central repeat region was highly antigenic, but the responses to this region could not be confidently mapped due to its high variability. The highly conserved N-terminus was targeted with low breadth and magnitude. In a minority of individuals, antibodies specific to the nuclear localization sequence and a portion of the proline-rich regions of the N-terminus were evident. In contrast, the first half of the conserved C-terminal domain was consistently targeted with high magnitude. Unfortunately, this region was not included in LANA partial C-terminal crystal structures, however, it was predicted to adopt predominantly random-coil structure. Coupled with functional and secondary structure domain predictions, VirScan revealed fine resolution epitope mapping of the N- and C-terminal domains of LANA that is consistent with previous antigenicity studies and may prove useful to correlate KSHV humoral immunity with pathogenesis.
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Affiliation(s)
- Sydney J. Bennett
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
- Department of Interdisciplinary Oncology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Dicle Yalcin
- Department of Interdisciplinary Oncology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Sara R. Privatt
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
- Department of Interdisciplinary Oncology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Owen Ngalamika
- Dermatology and Venereology Section, University Teaching Hospital, University of Zambia School of Medicine, Lusaka, Zambia
| | - Salum J. Lidenge
- Ocean Road Cancer Institute, Dar es Salaam, Tanzania
- Department of Clinical Oncology, Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - John T. West
- Department of Interdisciplinary Oncology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
| | - Charles Wood
- School of Biological Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska, United States of America
- Department of Interdisciplinary Oncology, Stanley S. Scott Cancer Center, Louisiana State University Health Sciences Center, New Orleans, Louisiana, United States of America
- * E-mail:
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Potential Association between Kaposi Sarcoma and Gout: An Exploratory Observational Study. Sarcoma 2020; 2020:8844970. [PMID: 33519292 PMCID: PMC7817232 DOI: 10.1155/2020/8844970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 11/17/2020] [Accepted: 11/19/2020] [Indexed: 11/17/2022] Open
Abstract
Background Kaposi sarcoma is a rare vascular mesenchymal neoplasm, associated with Human Herpes Virus 8 (HHV8). Gout is a condition clinically characterized by recurrent flares of arthritis and hyperuricemia. Following our clinical impression that patients with classical Kaposi sarcoma (CKS) have a high rate of gout, we explored this in a retrospective manner. Methods All consecutive patients diagnosed with sarcoma or carcinosarcoma within a single tertiary center between 1/2012–12/2017 were identified through the pathology department database. A cohort of CKS patients was compared with the non-Kaposi sarcoma and carcinosarcoma cohort. Data were extracted from patients' electronic medical records. Patients younger than 18 and patients without clinical data available were excluded. Association between diagnosis of gout and CKS was assessed and adjusted for risk factors. Results Three hundred and sixty-one patients were eligible for this analysis, 61 were diagnosed with CKS and 300 with other types of sarcoma. We found a higher incidence of gout in CKS patients, 11/61 (18%) patients, compared with 8/300 (2.6%) with other types of sarcoma, odds ratio (OR) 8.0 (P < 0.00001). This association persisted when adjusted for age >39 years (OR = 6.7, P < 0.00001), age and male sex (OR = 4.97, P < 0.0001), and when adjusting for multiple confounding factors and medical comorbidities. Conclusions We have demonstrated a statistically significant association between gout and CKS. As risk factors for gout were accounted for, this association may be explained by HHV8 immune-related effects. This should be further explored in vitro and in population-based studies.
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Pornputtapong N, Acheampong DA, Patumcharoenpol P, Jenjaroenpun P, Wongsurawat T, Jun SR, Yongkiettrakul S, Chokesajjawatee N, Nookaew I. KITSUNE: A Tool for Identifying Empirically Optimal K-mer Length for Alignment-Free Phylogenomic Analysis. Front Bioeng Biotechnol 2020; 8:556413. [PMID: 33072720 PMCID: PMC7538862 DOI: 10.3389/fbioe.2020.556413] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 08/24/2020] [Indexed: 12/22/2022] Open
Abstract
Genomic DNA is the best “unique identifier” for organisms. Alignment-free phylogenomic analysis, simple, fast, and efficient method to compare genome sequences, relies on looking at the distribution of small DNA sequence of a particular length, referred to as k-mer. The k-mer approach has been explored as a basis for sequence analysis applications, including assembly, phylogenetic tree inference, and classification. Although this approach is not novel, selecting the appropriate k-mer length to obtain the optimal resolution is rather arbitrary. However, it is a very important parameter for achieving the appropriate resolution for genome/sequence distances to infer biologically meaningful phylogenetic relationships. Thus, there is a need for a systematic approach to identify the appropriate k-mer from whole-genome sequences. We present K-mer–length Iterative Selection for UNbiased Ecophylogenomics (KITSUNE), a tool for assessing the empirically optimal k-mer length of any given set of genomes of interest for phylogenomic analysis via a three-step approach based on (1) cumulative relative entropy (CRE), (2) average number of common features (ACF), and (3) observed common features (OCF). Using KITSUNE, we demonstrated the feasibility and reliability of these measurements to obtain empirically optimal k-mer lengths of 11, 17, and ∼34 from large genome datasets of viruses, bacteria, and fungi, respectively. Moreover, we demonstrated a feature of KITSUNE for accurate species identification for the two de novo assembled bacterial genomes derived from error-prone long-reads sequences, and for a published yeast genome. In addition, KITSUNE was used to identify the shortest species-specific k-mer accurately identifying viruses. KITSUNE is freely available at https://github.com/natapol/kitsune.
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Affiliation(s)
- Natapol Pornputtapong
- Department of Biochemistry and Microbiology, Faculty of Pharmaceutical Sciences, and Research Unit of DNA Barcoding of Thai Medicinal Plants, Chulalongkorn University, Bangkok, Thailand
| | - Daniel A Acheampong
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States.,Joint Graduate Program in Bioinformatics, University of Arkansas at Little Rock and University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Preecha Patumcharoenpol
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Piroon Jenjaroenpun
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Thidathip Wongsurawat
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Se-Ran Jun
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States
| | - Suganya Yongkiettrakul
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Nipa Chokesajjawatee
- National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani, Thailand
| | - Intawat Nookaew
- Department of Biomedical Informatics, University of Arkansas for Medical Sciences, Little Rock, AR, United States
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Cornejo Castro EM, Marshall V, Lack J, Lurain K, Immonen T, Labo N, Fisher NC, Ramaswami R, Polizzotto MN, Keele BF, Yarchoan R, Uldrick TS, Whitby D. Dual infection and recombination of Kaposi sarcoma herpesvirus revealed by whole-genome sequence analysis of effusion samples. Virus Evol 2020; 6:veaa047. [PMID: 34211736 PMCID: PMC7474928 DOI: 10.1093/ve/veaa047] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Kaposi sarcoma herpesvirus (KSHV) is the etiological agent of three malignancies, Kaposi sarcoma (KS), primary effusion lymphoma (PEL) and KSHV-associated multicentric Castelman disease. KSHV infected patients may also have an interleukin six-related KSHV-associated inflammatory cytokine syndrome. KSHV-associated diseases occur in only a minority of chronically KSHV-infected individuals and often in the setting of immunosuppression. Mechanisms by which KSHV genomic variations and systemic co-infections may affect the pathogenic pathways potentially leading to these diseases have not been well characterized in vivo. To date, the majority of comparative genetic analyses of KSHV have been focused on a few regions scattered across the viral genome. We used next-generation sequencing techniques to investigate the taxonomic groupings of viruses from malignant effusion samples from fourteen participants with advanced KSHV-related malignancies, including twelve with PEL and two with KS and elevated KSHV viral load in effusions. The genomic diversity and evolutionary characteristics of nine isolated, near full-length KSHV genomes revealed extensive evidence of mosaic patterns across all these genomes. Further, our comprehensive NGS analysis allowed the identification of two distinct KSHV genome sequences in one individual, consistent with a dual infection. Overall, our results provide significant evidence for the contribution of KSHV phylogenomics to the origin of KSHV subtypes. This report points to a wider scope of studies to establish genome-wide patterns of sequence diversity and define the possible pathogenic role of sequence variations in KSHV-infected individuals.
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Affiliation(s)
- Elena M Cornejo Castro
- Viral Oncology Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Vickie Marshall
- Viral Oncology Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Justin Lack
- Advanced Biomedical Computing Center, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Kathryn Lurain
- HIV and AIDS Malignancy Branch, National Cancer Institute, 10 Center Dr, Bethesda, MD 20814, USA
| | - Taina Immonen
- Retroviral Evolution Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Nazzarena Labo
- Viral Oncology Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Nicholas C Fisher
- Viral Oncology Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Ramya Ramaswami
- HIV and AIDS Malignancy Branch, National Cancer Institute, 10 Center Dr, Bethesda, MD 20814, USA
| | - Mark N Polizzotto
- HIV and AIDS Malignancy Branch, National Cancer Institute, 10 Center Dr, Bethesda, MD 20814, USA
| | - Brandon F Keele
- Retroviral Evolution Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
| | - Robert Yarchoan
- HIV and AIDS Malignancy Branch, National Cancer Institute, 10 Center Dr, Bethesda, MD 20814, USA
| | - Thomas S Uldrick
- HIV and AIDS Malignancy Branch, National Cancer Institute, 10 Center Dr, Bethesda, MD 20814, USA
| | - Denise Whitby
- Viral Oncology Section, AIDS and Cancer Virus Program, Frederick National Laboratory for Cancer Research, P.O. Box B, Frederick, MD 21702, USA
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Sun C, Guo Y, Zhou W, Xia C, Xing X, Chen J, Li X, Zhu H, Lu J. p300 promotes cell proliferation through suppressing Kaposi's sarcoma-associated herpesvirus (KSHV) reactivation in the infected B-lymphoma cells. Virus Res 2020; 286:198066. [PMID: 32553609 DOI: 10.1016/j.virusres.2020.198066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 06/10/2020] [Accepted: 06/12/2020] [Indexed: 01/14/2023]
Abstract
Primary Effusion Lymphoma (PEL) is a B-cell lymphoma associated with Kaposi's sarcoma herpesvirus (KSHV) infection. However, the mechanism of oncogenesis of PEL is still unclear. Studies have shown that the cellular transcriptional coactivator p300 regulates the interaction between host and virus, which plays a vital role in viral replication. In this study, we investigated the role of p300 in BCBL1 cells during the KSHV life cycle. We found that p300 knockout resulted in an overall increase for the early lytic genes and changed the expression of genes associated with tumor development, proliferation, and the immune response in the KSHV infected B cells. However, knockout of p300 significantly inhibited the expression of the immediate-early gene RTA and the late lytic gene K8 after KSHV lytic activation. Additionally, the intracellular KSHV genome copy number and the virion production were reduced. These results demonstrated that p300 plays a crucial role in suppressing KSHV viral replication in BCBL1. Furthermore, we observed that the growth of BCBL1 was inhibited by knockout of p300, which confirmed our findings that p300 promotes cell proliferation. This study further provided evidence that p300 plays an important role in the pathogenesis of BCBL1, which might lead to the oncogenesis of PEL caused by KSHV infection.
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Affiliation(s)
- Chuankai Sun
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Yizhen Guo
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Wei Zhou
- The Biomedical Translational Research Institute, Jinan University Guangzhou, 510632, China
| | - Chuan Xia
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Xiwen Xing
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Jun Chen
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Xin Li
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Hua Zhu
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China
| | - Jie Lu
- Department of Biotechnology, College of Life Science and Technology, Jinan University Guangzhou, 510632, China.
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LANA and hnRNP A1 Regulate the Translation of LANA mRNA through G-Quadruplexes. J Virol 2020; 94:JVI.01508-19. [PMID: 31723020 DOI: 10.1128/jvi.01508-19] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 11/04/2019] [Indexed: 12/26/2022] Open
Abstract
During the latent phase, Kaposi's sarcoma-associated herpes virus (KSHV) maintains itself inside the host by escaping the host immune surveillance mechanism through restricted protein expression. Latency-associated nuclear antigen (LANA), the most abundantly expressed protein, is essential for viral persistence, as it plays important roles in latent viral DNA replication and efficient segregation of the viral genome to the daughter cells following cell division. KSHV evades immune detection by maintaining the levels of LANA protein below a threshold required for detection by the host immune system but sufficient to maintain the viral genome. LANA achieves this by controlling its expression through regulation of its promoters and by inhibiting its presentation through interaction with the proteins of class I and class II major histocompatibility complex (MHC) pathways. In this study, we identified a mechanism of LANA expression and restricted immune recognition through formation of G-quadruplexes in LANA mRNA. We show that the formation of these stable structures in LANA mRNA inhibits its translation to control antigen presentation, which was supported by treatment of cells with TMPyP4, a G-quadruplex-stabilizing ligand. We identified heterogenous ribonucleoprotein A1 (hnRNP A1) as a G-quadruplex-unwinding helicase, which unfolds these stable secondary structures to regulate LANA translation.IMPORTANCE LANA, the most abundantly expressed protein during latency, is a multifunctional protein which is absolutely required for the persistence of KSHV in the host cell. Even though the functions of LANA in aiding pathogenesis of the virus have been extensively studied, the mechanism of how LANA escapes host's immune surveillance is not fully understood. This study sheds light on the autoregulatory role of LANA to modulate its expression and immune evasion through formation of G-quadruplexes in its mRNA. We used G-quadruplex-stabilizing ligand to define the inhibition in LANA expression and presentation on the cell surface through MHC class I. We defined the autoregulatory role of LANA and identified a cellular RNA helicase, hnRNP A1, regulating the translation of LANA mRNA. This interaction of hnRNP A1 with LANA mRNA could be exploited for controlling KSHV latency.
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Sumbria D, Berber E, Rouse BT. Factors Affecting the Tissue Damaging Consequences of Viral Infections. Front Microbiol 2019; 10:2314. [PMID: 31636623 PMCID: PMC6787772 DOI: 10.3389/fmicb.2019.02314] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 09/23/2019] [Indexed: 12/15/2022] Open
Abstract
Humans and animals are infected by multiple endogenous and exogenous viruses but few agents cause overt tissue damage. We review the circumstances which favor overt disease expression. These can include intrinsic virulence of the agent, new agents acquired from heterologous species, the circumstances of infection such as dose and route, current infection with other agents which includes the composition of the microbiome at mucosal and other sites, past history of exposure to other infections as well as the immune status of the host. We also briefly discuss promising therapeutic strategies that can expand immune response patterns that minimize tissue damaging responses to viral infections.
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Affiliation(s)
| | | | - Barry T. Rouse
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, The University of Tennessee, Knoxville, Knoxville, TN, United States
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12
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Ungerleider NA, Jain V, Wang Y, Maness NJ, Blair RV, Alvarez X, Midkiff C, Kolson D, Bai S, Roberts C, Moss WN, Wang X, Serfecz J, Seddon M, Lehman T, Ma T, Dong Y, Renne R, Tibbetts SA, Flemington EK. Comparative Analysis of Gammaherpesvirus Circular RNA Repertoires: Conserved and Unique Viral Circular RNAs. J Virol 2019; 93:e01952-18. [PMID: 30567979 PMCID: PMC6401440 DOI: 10.1128/jvi.01952-18] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 12/11/2018] [Indexed: 01/02/2023] Open
Abstract
Recent studies have identified circular RNAs (circRNAs) expressed from the Epstein-Barr virus (EBV) and Kaposi's sarcoma herpesvirus (KSHV) human DNA tumor viruses. To gain initial insights into the potential relevance of EBV circRNAs in virus biology and disease, we assessed the circRNAome of the interspecies homologue rhesus macaque lymphocryptovirus (rLCV) in a naturally occurring lymphoma from a simian immunodeficiency virus (SIV)-infected rhesus macaque. This analysis revealed rLCV orthologues of the latency-associated EBV circular RNAs circRPMS1_E4_E3a and circEBNA_U. Also identified in two samples displaying unusually high lytic gene expression was a novel rLCV circRNA that contains both conserved and rLCV-specific RPMS1 exons and whose backsplice junctions flank an rLCV lytic origin of replication (OriLyt). Analysis of a lytic infection model for the murid herpesvirus 68 (MHV68) rhadinovirus identified a cluster of circRNAs near an MHV68 lytic origin of replication, with the most abundant of these, circM11_ORF69, spanning the OriLyt. Lastly, analysis of KSHV latency and reactivation models revealed the latency associated circRNA originating from the vIRF4 gene as the predominant viral circRNA. Together, the results of this study broaden our appreciation for circRNA repertoires in the Lymphocryptovirus and Rhadinovirus genera of gammaherpesviruses and provide evolutionary support for viral circRNA functions in latency and viral replication.IMPORTANCE Infection with oncogenic gammaherpesviruses leads to long-term viral persistence through a dynamic interplay between the virus and the host immune system. Critical for remodeling of the host cell environment after the immune responses are viral noncoding RNAs that modulate host signaling pathways without attracting adaptive immune recognition. Despite the importance of noncoding RNAs in persistent infection, the circRNA class of noncoding RNAs has only recently been identified in gammaherpesviruses. Accordingly, their roles in virus infection and associated oncogenesis are unknown. Here we report evolutionary conservation of EBV-encoded circRNAs determined by assessing the circRNAome in rLCV-infected lymphomas from an SIV-infected rhesus macaque, and we report latent and lytic circRNAs from KSHV and MHV68. These experiments demonstrate utilization of the circular RNA class of RNAs across 4 members of the gammaherpesvirus subfamily, and they identify orthologues and potential homoplastic circRNAs, implying conserved circRNA functions in virus biology and associated malignancies.
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Affiliation(s)
- Nathan A Ungerleider
- Department of Pathology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
| | - Vaibhav Jain
- Department of Biochemistry and Molecular Biology, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Yiping Wang
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Nicholas J Maness
- Department of Microbiology and Immunology, Tulane Regional Primate Center, Covington, Louisiana, USA
| | - Robert V Blair
- Division of Comparative Pathology, Tulane Regional Primate Center, Covington, Louisiana, USA
| | - Xavier Alvarez
- Division of Comparative Pathology, Tulane Regional Primate Center, Covington, Louisiana, USA
| | - Cecily Midkiff
- Division of Comparative Pathology, Tulane Regional Primate Center, Covington, Louisiana, USA
| | - Dennis Kolson
- Division of Comparative Pathology, Tulane Regional Primate Center, Covington, Louisiana, USA
| | - Shanshan Bai
- Department of Neurology, The Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Claire Roberts
- Department of Pathology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
| | - Walter N Moss
- Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, Iowa, USA
| | - Xia Wang
- Department of Pathology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
| | - Jacqueline Serfecz
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | | | | | - Tianfang Ma
- Department of Structural and Cellular Biology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
| | - Yan Dong
- Department of Structural and Cellular Biology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
| | - Rolf Renne
- Department of Biochemistry and Molecular Biology, University of Florida College of Medicine, Gainesville, Florida, USA
| | - Scott A Tibbetts
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, Florida, USA
| | - Erik K Flemington
- Department of Pathology, Tulane University School of Medicine, Tulane Cancer Center, New Orleans, Louisiana, USA
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Sallah N, Palser AL, Watson SJ, Labo N, Asiki G, Marshall V, Newton R, Whitby D, Kellam P, Barroso I. Genome-Wide Sequence Analysis of Kaposi Sarcoma-Associated Herpesvirus Shows Diversification Driven by Recombination. J Infect Dis 2018; 218:1700-1710. [PMID: 30010810 PMCID: PMC6195662 DOI: 10.1093/infdis/jiy427] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Accepted: 07/11/2018] [Indexed: 12/29/2022] Open
Abstract
Background Kaposi sarcoma-associated herpesvirus (KSHV) establishes lifelong infection in the human host and has been associated with a variety of malignancies. KSHV displays striking geographic variation in prevalence, which is highest in sub-Saharan Africa. The current KSHV genome sequences available are all tumor cell line-derived or primary tumor-associated viruses, which have provided valuable insights into KSHV genetic diversity. Methods Here, we sequenced 45 KSHV genomes from a Ugandan population cohort in which KSHV is endemic; these are the only genome sequences obtained from nondiseased individuals and of KSHV DNA isolated from saliva. Results Population structure analysis, along with the 25 published genome sequences from other parts of the world, showed whole-genome variation, separating sequences and variation within the central genome contributing to clustering of genomes by geography. We reveal new evidence for the presence of intragenic recombination and multiple recombination events contributing to the divergence of genomes into at least 5 distinct types. Discussion This study shows that large-scale genome-wide sequencing from clinical and epidemiological samples is necessary to capture the full extent of genetic diversity of KSHV, including recombination, and provides evidence to suggest a revision of KSHV genotype nomenclature.
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Affiliation(s)
- Neneh Sallah
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge
| | | | | | - Nazzarena Labo
- AIDS and Cancer Virus Program, Viral Oncology Section, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Maryland
| | - Gershim Asiki
- Medical Research Council/Uganda Virus Research Institute, Uganda Research Unit, London School of Hygiene and Tropical Medicine, United Kingdom
| | - Vickie Marshall
- AIDS and Cancer Virus Program, Viral Oncology Section, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Maryland
| | - Robert Newton
- Medical Research Council/Uganda Virus Research Institute, Uganda Research Unit, London School of Hygiene and Tropical Medicine, United Kingdom
| | - Denise Whitby
- AIDS and Cancer Virus Program, Viral Oncology Section, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Maryland
| | - Paul Kellam
- Kymab Ltd, Babraham Research Complex, Cambridge
- Department of Medicine, Imperial College London, United Kingdom
| | - Inês Barroso
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton, Cambridge
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Cell-Derived Viral Genes Evolve under Stronger Purifying Selection in Rhadinoviruses. J Virol 2018; 92:JVI.00359-18. [PMID: 29997213 DOI: 10.1128/jvi.00359-18] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 06/01/2018] [Indexed: 12/20/2022] Open
Abstract
Like many other large double-stranded DNA (dsDNA) viruses, herpesviruses are known to capture host genes to evade host defenses. Little is known about the detailed natural history of such genes, nor do we fully understand their evolutionary dynamics. A major obstacle is that they are often highly divergent, maintaining very low sequence similarity to host homologs. Here we use the herpesvirus genus Rhadinovirus as a model system to develop an analytical approach that combines complementary evolutionary and bioinformatic techniques, offering results that are both detailed and robust for a range of genes. Using a systematic phylogenetic strategy, we identify the original host lineage of viral genes with high confidence. We show that although host immunomodulatory genes evolve rapidly compared to other host genes, they undergo a clear increase in purifying selection once captured by a virus. To characterize this shift in detail, we developed a novel technique to identify changes in selection pressure that can be attributable to particular domains. These findings will inform us on how viruses develop strategies to evade the immune system, and our synthesis of techniques can be reapplied to other viruses or biological systems with similar analytical challenges.IMPORTANCE Viruses and hosts have been shown to capture genes from one another as part of the evolutionary arms race. Such genes offer a natural experiment on the effects of evolutionary pressure, since the same gene exists in vastly different selective environments. However, sequences of viral homologs often bear little similarity to the original sequence, complicating the reconstruction of their shared evolutionary history with host counterparts. In this study, we use a genus of herpesviruses as a model system to comprehensively investigate the evolution of host-derived viral genes, using a synthesis of genomics, phylogenetics, selection analysis, and nucleotide and amino acid modeling.
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Sehrawat S, Kumar D, Rouse BT. Herpesviruses: Harmonious Pathogens but Relevant Cofactors in Other Diseases? Front Cell Infect Microbiol 2018; 8:177. [PMID: 29888215 PMCID: PMC5981231 DOI: 10.3389/fcimb.2018.00177] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Accepted: 05/08/2018] [Indexed: 11/24/2022] Open
Abstract
Most vertebrates are infected with one or more herpesviruses and remain so for the rest of their lives. The relationship of immunocompetent healthy host with herpesviruses may sometime be considered as harmonious. However, clinically severe diseases can occur when host immunity is compromised due to aging, during some stress response, co-infections or during neoplastic disease conditions. Discord can also occur during iatrogenic immunosuppression used for controlling graft rejection, in some primary genetic immunodeficiencies as well as when the virus infects a non-native host. In this review, we discuss such issues and their influence on host-herpesvirus interaction.
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Affiliation(s)
- Sharvan Sehrawat
- Department of Biological Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
| | - Dhaneshwar Kumar
- Department of Biological Sciences, Indian Institute of Science Education and Research Mohali, Mohali, India
| | - Barry T Rouse
- Department of Biomedical and Diagnostic Sciences, College of Veterinary Sciences, The University of Tennessee, Knoxville, Knoxville, TN, United States
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16
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Awazawa R, Utsumi D, Katano H, Awazawa T, Miyagi T, Hayashi K, Matori S, Uezato H, Takahashi K. High Prevalence of Distinct Human Herpesvirus 8 Contributes to the High Incidence of Non-acquired Immune Deficiency Syndrome-Associated Kaposi's Sarcoma in Isolated Japanese Islands. J Infect Dis 2017; 216:850-858. [PMID: 28968717 DOI: 10.1093/infdis/jix424] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2017] [Accepted: 08/16/2017] [Indexed: 12/20/2022] Open
Abstract
Background Non-acquired immune deficiency syndrome (AIDS) Kaposi's sarcoma (KS) is extremely rare in Japan but highly endemic in Okinawa, especially in Miyako Islands. We aimed to elucidate the exact incidence and cause of this high prevalence. Methods Non-AIDS KS cases in Okinawa Prefecture over the past 31 years were reviewed, and human herpesvirus 8 (HHV8) seroprevalence in Miyako Islands was determined. We examined whole-genome sequences of 3 HHV8 strains and performed whole-exome sequencing of 4 male patients from Miyako Islands. Results Approximately half of the non-AIDS KS cases in Okinawa Prefecture were from Miyako Islands. The age-adjusted incidence rate was 0.87/105 per year for Miyako Islands and 0.056/105 per year for the rest of Okinawa. Human herpesvirus 8 seroprevalence was 15.4% in Miyako Islands. The 3 HHV8 genomes isolated from Miyako islanders formed a phylogenetically branch distinct from those of previously sequenced HHV8 strains and shared specific mutations in 9 proteins. These mutations were verified in Okinawan patients other than those from Miyako Islands. Whole-exome sequencing of the 4 male Miyako Islanders did not reveal shared pathogenic mutations. Conclusions Miyako Islands are an endemic area of non-AIDS KS. The high rate of a distinct HHV8 may contribute to the high incidence of KS in the region.
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Affiliation(s)
- Ryoko Awazawa
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Daisuke Utsumi
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Harutaka Katano
- Department of Pathology, National Institute of Infectious Diseases, Tokyo, Japan
| | - Tsuyoshi Awazawa
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Takuya Miyagi
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Kentaro Hayashi
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Shigetaka Matori
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Hiroshi Uezato
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
| | - Kenzo Takahashi
- Department of Dermatology, University of the Ryukyus, Graduate School of Medicine, Okinawa, Japan
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Katabathina VS, Menias CO, Tammisetti VS, Lubner MG, Kielar A, Shaaban A, Mansour J, Surabhi VR, Hara AK. Malignancy after Solid Organ Transplantation: Comprehensive Imaging Review. Radiographics 2016; 36:1390-407. [DOI: 10.1148/rg.2016150175] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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18
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Soleimanpour S, Hassannia T, Motiee M, Amini AA, Rezaee SAR. Fcγ1 fragment of IgG1 as a powerful affinity tag in recombinant Fc-fusion proteins: immunological, biochemical and therapeutic properties. Crit Rev Biotechnol 2016; 37:371-392. [PMID: 27049690 DOI: 10.3109/07388551.2016.1163323] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Affinity tags are vital tools for the production of high-throughput recombinant proteins. Several affinity tags, such as the hexahistidine tag, maltose-binding protein, streptavidin-binding peptide tag, calmodulin-binding peptide, c-Myc tag, glutathione S-transferase and FLAG tag, have been introduced for recombinant protein production. The fragment crystallizable (Fc) domain of the IgG1 antibody is one of the useful affinity tags that can facilitate detection, purification and localization of proteins and can improve the immunogenicity, modulatory effects, physicochemical and pharmaceutical properties of proteins. Fcγ recombinant forms a group of recombinant proteins called Fc-fusion proteins (FFPs). FFPs are widely used in drug discovery, drug delivery, vaccine design and experimental research on receptor-ligand interactions. These fusion proteins have become successful alternatives to monoclonal antibodies for drug developments. In this review, the physicochemical, biochemical, immunological, pharmaceutical and therapeutic properties of recombinant FFPs were discussed as a new generation of bioengineering strategies.
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Affiliation(s)
- Saman Soleimanpour
- a Microbiology & Virology Research Center, Bu-Ali Research Institute, Mashhad University of Medical Sciences , Mashhad, Iran
| | - Tahereh Hassannia
- b Internal medicine Department, Arash Hospital, the College of Medicine, Tehran University of Medical Sciences , Tehran, Iran
| | - Mahdieh Motiee
- c Inflammation and Inflammatory Diseases Research Center, Medical School, Mashhad University of Medical Sciences , Mashhad, Iran
| | - Abbas Ali Amini
- d Department of Immunology, faculty of medicine, Kurdistan University of Medical Sciences , Sanandaj, Iran
| | - S A R Rezaee
- c Inflammation and Inflammatory Diseases Research Center, Medical School, Mashhad University of Medical Sciences , Mashhad, Iran
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Strahan R, Uppal T, Verma SC. Next-Generation Sequencing in the Understanding of Kaposi's Sarcoma-Associated Herpesvirus (KSHV) Biology. Viruses 2016; 8:92. [PMID: 27043613 PMCID: PMC4848587 DOI: 10.3390/v8040092] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 03/21/2016] [Accepted: 03/23/2016] [Indexed: 12/16/2022] Open
Abstract
Non-Sanger-based novel nucleic acid sequencing techniques, referred to as Next-Generation Sequencing (NGS), provide a rapid, reliable, high-throughput, and massively parallel sequencing methodology that has improved our understanding of human cancers and cancer-related viruses. NGS has become a quintessential research tool for more effective characterization of complex viral and host genomes through its ever-expanding repertoire, which consists of whole-genome sequencing, whole-transcriptome sequencing, and whole-epigenome sequencing. These new NGS platforms provide a comprehensive and systematic genome-wide analysis of genomic sequences and a full transcriptional profile at a single nucleotide resolution. When combined, these techniques help unlock the function of novel genes and the related pathways that contribute to the overall viral pathogenesis. Ongoing research in the field of virology endeavors to identify the role of various underlying mechanisms that control the regulation of the herpesvirus biphasic lifecycle in order to discover potential therapeutic targets and treatment strategies. In this review, we have complied the most recent findings about the application of NGS in Kaposi’s sarcoma-associated herpesvirus (KSHV) biology, including identification of novel genomic features and whole-genome KSHV diversities, global gene regulatory network profiling for intricate transcriptome analyses, and surveying of epigenetic marks (DNA methylation, modified histones, and chromatin remodelers) during de novo, latent, and productive KSHV infections.
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Affiliation(s)
- Roxanne Strahan
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, 1664 N, Virginia Street, MS 320, Reno, NV 89557, USA.
| | - Timsy Uppal
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, 1664 N, Virginia Street, MS 320, Reno, NV 89557, USA.
| | - Subhash C Verma
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, 1664 N, Virginia Street, MS 320, Reno, NV 89557, USA.
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Hussein HAM, Walker LR, Akula SM. KSHV gB associated RGD interactions promote attachment of cells by inhibiting the potential migratory signals induced by the disintegrin-like domain. BMC Cancer 2016; 16:148. [PMID: 26912031 PMCID: PMC4766674 DOI: 10.1186/s12885-016-2173-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 02/14/2016] [Indexed: 12/18/2022] Open
Abstract
Background Kaposi’s sarcoma-associated herpesvirus (KSHV) glycoprotein B (gB) is not only expressed on the envelope of mature virions but also on the surfaces of cells undergoing lytic replication. Among herpesviruses, KSHV gB is the only glycoprotein known to possess the RGD (Arg-Gly-Asp) binding integrin domain critical to mediating cell attachment. Recent studies described gB to also possess a disintegrin-like domain (DLD) said to interact with non-RGD binding integrins. We wanted to decipher the roles of two individually distinct integrin binding domains (RGD versus DLD) within KSHV gB in regulating attachment of cells over cell migration. Methods We established HeLa cells expressing recombinant full length gB, gB lacking a functional RGD (gBΔR), and gB lacking a functionally intact DLD (gBΔD) on their cell surfaces. These cells were tested in wound healing assay, Transwell migration assay, and adhesion assay to monitor the ability of the RGD and DLD integrin recognition motifs in gB to mediate migration and attachment of cells. We also used soluble forms of the respective gB recombinant proteins to analyze and confirm their effect on migration and attachment of cells. The results from the above studies were authenticated by the use of imaging, and standard biochemical approaches as Western blotting and RNA silencing using small interfering RNA. Results The present report provides the following novel findings: (i) gB does not induce cell migration; (ii) RGD domain in KSHV gB is the switch that inhibits the ability of DLD to induce cellular migration thus promoting attachment of cells. Conclusions Independently, RGD interactions mediate attachment of cells while DLD interactions regulate migration of cells. However, when both RGD and DLD are functionally present in the same protein, gB, the RGD interaction-induced attachment of cells overshadows the ability of DLD mediated signaling to induce migration of cells. Furthering our understanding of the molecular mechanism of integrin engagement with RGD and DLD motifs within gB could identify promising new therapeutic avenues and research areas to explore. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2173-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hosni A M Hussein
- Department of Microbiology & Immunology, Brody School of Medicine at East Carolina University, Greenville, NC, 27834, USA
| | - Lia R Walker
- Department of Microbiology & Immunology, Brody School of Medicine at East Carolina University, Greenville, NC, 27834, USA
| | - Shaw M Akula
- Department of Microbiology & Immunology, Brody School of Medicine at East Carolina University, Greenville, NC, 27834, USA.
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Whole-Genome Sequencing of Kaposi's Sarcoma-Associated Herpesvirus from Zambian Kaposi's Sarcoma Biopsy Specimens Reveals Unique Viral Diversity. J Virol 2015; 89:12299-308. [PMID: 26423952 DOI: 10.1128/jvi.01712-15] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 09/18/2015] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent for Kaposi's sarcoma (KS). Both KSHV and KS are endemic in sub-Saharan Africa where approximately 84% of global KS cases occur. Nevertheless, whole-genome sequencing of KSHV has only been completed using isolates from Western countries-where KS is not endemic. The lack of whole-genome KSHV sequence data from the most clinically important geographical region, sub-Saharan Africa, represents an important gap since it remains unclear whether genomic diversity has a role on KSHV pathogenesis. We hypothesized that distinct KSHV genotypes might be present in sub-Saharan Africa compared to Western countries. Using a KSHV-targeted enrichment protocol followed by Illumina deep-sequencing, we generated and analyzed 16 unique Zambian, KS-derived, KSHV genomes. We enriched KSHV DNA over cellular DNA 1,851 to 18,235-fold. Enrichment provided coverage levels up to 24,740-fold; therefore, supporting highly confident polymorphism analysis. Multiple alignment of the 16 newly sequenced KSHV genomes showed low level variability across the entire central conserved region. This variability resulted in distinct phylogenetic clustering between Zambian KSHV genomic sequences and those derived from Western countries. Importantly, the phylogenetic segregation of Zambian from Western sequences occurred irrespective of inclusion of the highly variable genes K1 and K15. We also show that four genes within the more conserved region of the KSHV genome contained polymorphisms that partially, but not fully, contributed to the unique Zambian KSHV whole-genome phylogenetic structure. Taken together, our data suggest that the whole KSHV genome should be taken into consideration for accurate viral characterization. IMPORTANCE Our results represent the largest number of KSHV whole-genomic sequences published to date and the first time that multiple genomes have been sequenced from sub-Saharan Africa, a geographic area where KS is highly endemic. Based on our new sequence data, it is apparent that whole-genome KSHV diversity is greater than previously appreciated and differential phylogenetic clustering exists between viral genomes of Zambia and Western countries. Furthermore, individual genes may be insufficient for KSHV genetic characterization. Continued investigation of the KSHV genetic landscape is necessary in order to effectively understand the role of viral evolution and sequence diversity on KSHV gene functions and pathogenesis.
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Interference with the Autophagic Process as a Viral Strategy to Escape from the Immune Control: Lesson from Gamma Herpesviruses. J Immunol Res 2015; 2015:546063. [PMID: 26090494 PMCID: PMC4451563 DOI: 10.1155/2015/546063] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 04/13/2015] [Accepted: 04/28/2015] [Indexed: 12/14/2022] Open
Abstract
We summarized the most recent findings on the role of autophagy in antiviral immune response. We described how viruses have developed strategies to subvert the autophagic process. A particular attention has been given to Epstein-Barr and Kaposi's sarcoma associated Herpesvirus, viruses studied for many years in our laboratory. These two viruses belong to γ-Herpesvirus subfamily and are associated with several human cancers. Besides the effects on the immune response, we have described how autophagy subversion by viruses may also concur to the enhancement of their replication and to viral tumorigenesis.
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A Rhesus Rhadinovirus Viral Interferon (IFN) Regulatory Factor Is Virion Associated and Inhibits the Early IFN Antiviral Response. J Virol 2015; 89:7707-21. [PMID: 25972548 DOI: 10.1128/jvi.01175-15] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 05/08/2015] [Indexed: 01/14/2023] Open
Abstract
UNLABELLED The interferon (IFN) response is the earliest host immune response dedicated to combating viral infection. As such, viruses have evolved strategies to subvert this potent antiviral response. Two closely related gammaherpesviruses, Kaposi's sarcoma-associated herpesvirus (KSHV) and rhesus macaque rhadinovirus (RRV), are unique in that they express viral homologues to cellular interferon regulatory factors (IRFs), termed viral IRFs (vIRFs). Cellular IRFs are a family of transcription factors that are particularly important for the transcription of type I IFNs. Here, we demonstrate a strategy employed by RRV to ensure rapid inhibition of virus-induced type I IFN induction. We found that RRV vIRF R6, when expressed ectopically, interacts with a transcriptional coactivator, CREB-binding protein (CBP), in the nucleus. As a result, phosphorylated IRF3, an important transcriptional regulator in beta interferon (IFN-β) transcription, fails to effectively bind to the IFN-β promoter, thus inhibiting the activation of IFN-β genes. In addition, we found R6 within RRV virion particles via immunoelectron microscopy and, furthermore, that virion-associated R6 is capable of inhibiting the type I IFN response by preventing efficient binding of IRF3/CBP complexes to the IFN-β promoter in the context of infection. The work shown here is the first example of a vIRF being associated with either the KSHV or RRV virion. The presence of this immunomodulatory protein in the RRV virion provides the virus with an immediate mechanism to evade the host IFN response, thus enabling the virus to effectively establish an infection within the host. IMPORTANCE Kaposi's sarcoma-associated herpesvirus (KSHV) and the closely related rhesus macaque rhadinovirus (RRV) are the only viruses known to encode viral homologues to cellular interferon regulatory factors (IRFs), known as vIRFs. In KSHV, these proteins have been shown to play major roles in a variety of cellular processes and are particularly important in the evasion of the host type I interferon (IFN) response. In this study, we delineate the immunomodulatory mechanism of an RRV vIRF and its ability to assist the virus in rapid immune evasion by being prepackaged within the virion, thus providing evidence, for the first time, of a virion-associated vIRF. This work further contributes to our understanding of the mechanisms behind immunomodulation by the RRV vIRFs during infection.
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Jalilvand S, Shoja Z, Marashi SM, Shahmahmoodi S, Safaie-Naraghi Z, Nourijelyani K, Nesheli AB, Mokhtari-Azad T. Mitochondrial haplogroups and control region polymorphisms in Kaposi's sarcoma patients. J Med Virol 2015; 87:1608-15. [DOI: 10.1002/jmv.24197] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/23/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Somayeh Jalilvand
- Virology Department; School of Public Health; Tehran University of Medical Sciences; Tehran Iran
| | | | - Sayed Mahdi Marashi
- Virology Department; School of Public Health; Tehran University of Medical Sciences; Tehran Iran
| | - Shohreh Shahmahmoodi
- Virology Department; School of Public Health; Tehran University of Medical Sciences; Tehran Iran
| | | | - Keramat Nourijelyani
- Biostatistics Department; School of Public Health; Tehran University of Medical Sciences; Tehran Iran
| | | | - Talat Mokhtari-Azad
- Virology Department; School of Public Health; Tehran University of Medical Sciences; Tehran Iran
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Ahmadi Ghezeldasht S, Hassannia T, Rafatpanah H, Hekmat R, Valizadeh N, Ghayour Mobarhan M, Rezaee SA. Oncogenic Virus Infections in the General Population and End-stage Renal Disease Patients With Special Emphasis on Kaposi's Sarcoma Associated Herpes Virus (KSHV) in Northeast of Iran. Jundishapur J Microbiol 2015; 8:e14920. [PMID: 25834713 PMCID: PMC4377171 DOI: 10.5812/jjm.14920] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Revised: 12/14/2013] [Accepted: 07/06/2014] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Globally, almost 20% of cancers are related to infectious agents that can be prevented. Oncogenicity refers to viruses that may cause cancers, more importantly in immunocompromised subjects such as transplant and hemodialysis patients. Therefore, epidemiological studies are the first line for understanding the importance of these agents in public health, particularly, in mobile populations, tourism and pilgrimage regions. OBJECTIVES Oncogenic viral infections, such as hepatitis B virus (HBV), hepatitis C virus (HCV) and Epstein-barr virus (EBV) are the most common viral agents in immunocompromised patients. Furthermore, human T lymphocyte virus type I (HTLV-I), due to endemicity in Khorasan Razavi province located northeast of Iran as a pilgrimage region, and Kaposi's sarcoma associated herpes virus (KSHV), as an oncogenic herpesvirus in immunocompromised subjects have been investigated among the general population and those with end-stage renal diseases (ESRD). PATIENTS AND METHODS A cross-sectional study was carried out among 1227 randomly selected individuals; 25 donors and 195 patients with ESRD, including 60 kidney transplant recipients and 135 dialysis patients from the Khorasan Razavi province, Iran. Serological tests were carried out using commercial enzyme-immunoassay kits. To confirm positive serology tests, the extracted viral DNA or RNA was examined for the presence of KSHV, HTLV-I and HCV by conventional PCR. RESULTS The prevalence of KSHV infection in the general population was 1.71% (21/1227); 2.60% (10/384) males and 1.30% (11/843) females. In kidney transplants, viral infections occurred in 23.3% of subjects; including EBV, HTLV-I and HBV-HCV co-infection in 8.3%, 3.3% and 1.7%, respectively. In patients on hemodialysis, viral infections were present in 29.6% including EBV, HTLV-I and HBV-HCV co-infection in 2.2%, 5.9% and 16.3%, respectively. Seroprevalence of KSHV in patients with kidney transplants was 1.7% and in patients on dialysis was 3.0%. Furthermore, KSHV and HTLV-I genome was detected in 25% and 100% of seropositive subjects, respectively. CONCLUSIONS In conclusion, this study demonstrated that these tumor virus infections including HTLV-I, KSHV and particularly hepatitis viruses (HBV plus HCV) are prevalent in the general population and in patients on hemodialysis, which might be an important health concern in this region due to the mobile population.
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Affiliation(s)
- Sanaz Ahmadi Ghezeldasht
- Research Center for HIV/AIDS, HTLV and Viral Hepatitis, Iranian Academic Center for Education, Culture and Research (ACECR), Mashhad Branch, Mashhad, IR Iran
| | - Tahereh Hassannia
- Internal Medicine Department, Baharloo Hospital, Tehran University of Medical Sciences, Tehran, IR Iran
| | - Houshang Rafatpanah
- Immunology Research Center, Buali Research Institute, Mashhad University of Medical Sciences, Mashhad, IR Iran
| | - Reza Hekmat
- Nephrology Department, Mashhad University of Medical Sciences, Mashhad, IR Iran
| | - Narges Valizadeh
- Immunology Research Center, Buali Research Institute, Mashhad University of Medical Sciences, Mashhad, IR Iran
| | - Majid Ghayour Mobarhan
- Research Center for HIV/AIDS, HTLV and Viral Hepatitis, Iranian Academic Center for Education, Culture and Research (ACECR), Mashhad Branch, Mashhad, IR Iran
| | - Seyed Abdolrahim Rezaee
- Research Center for HIV/AIDS, HTLV and Viral Hepatitis, Iranian Academic Center for Education, Culture and Research (ACECR), Mashhad Branch, Mashhad, IR Iran
- Inflammation and Inflammatory Diseases Research Center, Medical School, Mashhad University of Medical Sciences, Mashhad, IR Iran
- Corresponding author: Seyed Abdolrahim Rezaee, Inflammation and Inflammatory Diseases Research Center, Medical School, Mashhad University of Medical Sciences, Mashhad, IR Iran. Tel: +98-5138436626, E-mail:
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Structural properties of a viral orthologue of cellular CD200 protein: KSHV vOX2. Virology 2015; 474:94-104. [DOI: 10.1016/j.virol.2014.10.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 07/29/2014] [Accepted: 10/22/2014] [Indexed: 12/29/2022]
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Mølleskov-Jensen AS, Oliveira MT, Farrell HE, Davis-Poynter N. Virus-Encoded 7 Transmembrane Receptors. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2015; 129:353-93. [DOI: 10.1016/bs.pmbts.2014.10.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Development of an in situ hybridization assay for the detection of ostreid herpesvirus type 1 mRNAs in the Pacific oyster, Crassostrea gigas. J Virol Methods 2014; 211:43-50. [PMID: 25455903 DOI: 10.1016/j.jviromet.2014.10.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 10/10/2014] [Accepted: 10/14/2014] [Indexed: 11/21/2022]
Abstract
An in situ hybridization protocol for detecting mRNAs of ostreid herpesvirus type 1 (OsHV-1) which infects Pacific oysters, Crassostrea gigas, was developed. Three RNA probes were synthesized by cloning three partial OsHV-1 genes into plasmids using three specific primer pairs, and performing a transcription in the presence of digoxigenin dUTP. The RNA probes were able to detect the virus mRNAs in paraffin sections of experimentally infected oysters 26 h post-injection. The in situ hybridization showed that the OsHV-1 mRNAs were mainly present in connective tissues in gills, mantle, adductor muscle, digestive gland and gonads. DNA detection by in situ hybridization using a DNA probe and viral DNA quantitation by real-time PCR were also performed and results were compared with those obtained using RNA probes.
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Kaposi's sarcoma-associated herpesvirus-encoded replication and transcription activator impairs innate immunity via ubiquitin-mediated degradation of myeloid differentiation factor 88. J Virol 2014; 89:415-27. [PMID: 25320320 DOI: 10.1128/jvi.02591-14] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
UNLABELLED Kaposi's sarcoma-associated herpesvirus (KSHV) is a human gammaherpesvirus with latent and lytic reactivation cycles. The mechanism by which KSHV evades the innate immune system to establish latency has not yet been precisely elucidated. Toll-like receptors (TLRs) are the first line of defense against viral infections. Myeloid differentiation factor 88 (MyD88) is a key adaptor that interacts with all TLRs except TLR3 to produce inflammatory factors and type I interferons (IFNs), which are central components of innate immunity against microbial infection. Here, we found that KSHV replication and transcription activator (RTA), which is an immediate-early master switch protein of viral cycles, downregulates MyD88 expression at the protein level by degrading MyD88 through the ubiquitin (Ub)-proteasome pathway. We identified the interaction between RTA and MyD88 in vitro and in vivo and demonstrated that RTA functions as an E3 ligase to ubiquitinate MyD88. MyD88 also was repressed at the early stage of de novo infection as well as in lytic reactivation. We also found that RTA inhibited lipopolysaccharide (LPS)-triggered activation of the TLR4 pathway by reducing IFN production and NF-κB activity. Finally, we showed that MyD88 promoted the production of IFNs and inhibited KSHV LANA-1 gene transcription. Taken together, our results suggest that KSHV RTA facilitates the virus to evade innate immunity through the degradation of MyD88, which might be critical for viral latency control. IMPORTANCE MyD88 is an adaptor for all TLRs other than TLR3, and it mediates inflammatory factors and IFN production. Our study demonstrated that the KSHV RTA protein functions as an E3 ligase to degrade MyD88 through the ubiquitin-proteasome pathway and block the transmission of TLRs signals. Moreover, we found that KSHV inhibited MyD88 expression during the early stage of de novo infection as well as in lytic reactivation. These results provide a potential mechanism for the virus to evade innate immunity.
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Campbell DM, Rappocciolo G, Jenkins FJ, Rinaldo CR. Dendritic cells: key players in human herpesvirus 8 infection and pathogenesis. Front Microbiol 2014; 5:452. [PMID: 25221546 PMCID: PMC4148009 DOI: 10.3389/fmicb.2014.00452] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 08/11/2014] [Indexed: 11/13/2022] Open
Abstract
Human herpesvirus 8 (HHV-8; Kaposi's sarcoma-associated herpesvirus) is an oncogenic gammaherpesvirus that primarily infects cells of the immune and vascular systems. HHV-8 interacts with and targets professional antigen presenting cells and influences their function. Infection alters the maturation, antigen presentation, and immune activation capabilities of certain dendritic cells (DC) despite non-robust lytic replication in these cells. DC sustains a low level of antiviral functionality during HHV-8 infection in vitro. This may explain the ability of healthy individuals to effectively control this virus without disease. Following an immune compromising event, such as organ transplantation or human immunodeficiency virus type 1 infection, a reduced cellular antiviral response against HHV-8 compounded with skewed DC cytokine production and antigen presentation likely contributes to the development of HHV-8 associated diseases, i.e., Kaposi's sarcoma and certain B cell lymphomas. In this review we focus on the role of DC in the establishment of HHV-8 primary and latent infection, the functional state of DC during HHV-8 infection, and the current understanding of the factors influencing virus-DC interactions in the context of HHV-8-associated disease.
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Affiliation(s)
- Diana M Campbell
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA, USA
| | - Giovanna Rappocciolo
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA, USA
| | - Frank J Jenkins
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA, USA ; Department of Pathology, School of Medicine, University of Pittsburgh Pittsburgh, PA, USA
| | - Charles R Rinaldo
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA, USA ; Department of Pathology, School of Medicine, University of Pittsburgh Pittsburgh, PA, USA
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Tan X, Li D, Wang X, Zeng Y, Yan Y, Yang L. Claudin-2 downregulation by KSHV infection is involved in the regulation of endothelial barrier function. J Cutan Pathol 2014; 41:630-9. [PMID: 24995964 DOI: 10.1111/cup.12332] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 02/01/2014] [Accepted: 02/17/2014] [Indexed: 12/25/2022]
Abstract
BACKGROUND Kaposi sarcoma (KS), caused by the infection of Kaposi sarcoma-associated herpesvirus (KSHV), is a disease manifested mainly by dark purple skin and mouth nodules. Cancer care studies showed that co-infection of KSHV and human immunodeficiency virus (HIV) was able to increase the patients' survival, but the underlying mechanisms are still elusive. METHODS To understand the mechanism underlying the prolonged survival in KSHV-HIV co-infected patients, we performed microarray analysis on RNA extracted from biopsies from KS tumors and adjacent healthy tissues in four KS patients. Subsequently, we performed hierarchical clustering, gene ontology (GO) and ingenuity pathway analysis. We then characterized the roles of tight junction protein claudin-2 in the endothelial barrier function. RESULTS Three hundred and forty-three differentially expressed genes were identified, of which 246 genes exhibited significantly increased expression in the tumor compared to the adjacent healthy tissue and 97 genes showed downregulated expression, including claudin-2. Knockdown of claudin-2 in cultured endothelial cells enhances barrier function by altering the charge selectivity, but not the size selectivity. CONCLUSION Claudin-2 expression is decreased in KS tumors from patients co-infected with KSHV and HIV. Decreased claudin-2 enhances endothelial barrier function and may play a role in the prolonged survival of patients with KSHV and HIV co-infection.
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Affiliation(s)
- Xiaohua Tan
- School of Medicine, Hangzhou Normal University, Hangzhou, Zhejiang, China
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The first endogenous herpesvirus, identified in the tarsier genome, and novel sequences from primate rhadinoviruses and lymphocryptoviruses. PLoS Genet 2014; 10:e1004332. [PMID: 24945689 PMCID: PMC4063692 DOI: 10.1371/journal.pgen.1004332] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 03/07/2014] [Indexed: 11/19/2022] Open
Abstract
Herpesviridae is a diverse family of large and complex pathogens whose genomes are extremely difficult to sequence. This is particularly true for clinical samples, and if the virus, host, or both genomes are being sequenced for the first time. Although herpesviruses are known to occasionally integrate in host genomes, and can also be inherited in a Mendelian fashion, they are notably absent from the genomic fossil record comprised of endogenous viral elements (EVEs). Here, we combine paleovirological and metagenomic approaches to both explore the constituent viral diversity of mammalian genomes and search for endogenous herpesviruses. We describe the first endogenous herpesvirus from the genome of the Philippine tarsier, belonging to the Roseolovirus genus, and characterize its highly defective genome that is integrated and flanked by unambiguous host DNA. From a draft assembly of the aye-aye genome, we use bioinformatic tools to reveal over 100,000 bp of a novel rhadinovirus that is the first lemur gammaherpesvirus, closely related to Kaposi's sarcoma-associated virus. We also identify 58 genes of Pan paniscus lymphocryptovirus 1, the bonobo equivalent of human Epstein-Barr virus. For each of the viruses, we postulate gene function via comparative analysis to known viral relatives. Most notably, the evidence from gene content and phylogenetics suggests that the aye-aye sequences represent the most basal known rhadinovirus, and indicates that tumorigenic herpesviruses have been infecting primates since their emergence in the late Cretaceous. Overall, these data show that a genomic fossil record of herpesviruses exists despite their extremely large genomes, and expands the known diversity of Herpesviridae, which will aid the characterization of pathogenesis. Our analytical approach illustrates the benefit of intersecting evolutionary approaches with metagenomics, genetics and paleovirology. Herpesviridae is a family of DNA viruses that have characteristically large and complex genomes. This defining feature is also responsible for bioinformatic challenges that complicate herpesvirus genomics, and why an endogenous herpesvirus remains elusive. Given that several species of herpesvirus are clinically relevant to humans, there is a pressing demand for techniques capable of generating and managing large quantities of herpesvirus genome data. This is coupled with a need to explore herpesvirus diversity in order to understand pathogenesis within an evolutionary context. Lessons from the study of ancient viral integrations have also highlighted the need to include information offered by paleoviruses. Using perspectives from paleovirology and metagenomics, we identify three herpesviruses within the genome data of their primate hosts, including the first endogenous herpesvirus. All three viruses are closely related to important human pathogens and two of them are entirely new species. Both comparative molecular biology and evolutionary analysis were applied to examine our results for their clinical relevance. Furthermore, we demonstrate how this analytical approach was also used for the data collection itself, by treating nucleotide databases in their entirety as a single metagenomic resource.
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Alibek K, Baiken Y, Kakpenova A, Mussabekova A, Zhussupbekova S, Akan M, Sultankulov B. Implication of human herpesviruses in oncogenesis through immune evasion and supression. Infect Agent Cancer 2014; 9:3. [PMID: 24438207 PMCID: PMC3904197 DOI: 10.1186/1750-9378-9-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2013] [Accepted: 01/07/2014] [Indexed: 12/20/2022] Open
Abstract
All human herpesviruses (HHVs) have been implicated in immune system evasion and suppression. Moreover, two HHV family members, i.e. EBV and KSHV, are recognised as oncogenic viruses. Our literature review summarises additional examples of possible oncogenic mechanisms that have been attributed to other HHVs. In general, HHVs affect almost every cancer-implicated branch of the immune system, namely tumour-promoting inflammation, immune evasion, and immunosuppression. Some HHVs accomplish these effects by inhibiting apoptotic pathways and by promoting proliferation. Mechanisms related to immunosupression and low grade chronic inflammation could eventually result in the initiation and progression of cancer. In this article we open a discussion on the members of Herpesviridae, their immune evasion and suppression mechanisms, and their possible role in cancer development. We conclude that discerning the mechanisms of interplay between HHV, immune system, and cancer is essential for the development of novel preventative and therapeutic approaches for cancer treatment and prophylaxis.
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Affiliation(s)
| | | | - Ainur Kakpenova
- Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana 010000, Kazakhstan.
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Next-generation sequence analysis of the genome of RFHVMn, the macaque homolog of Kaposi's sarcoma (KS)-associated herpesvirus, from a KS-like tumor of a pig-tailed macaque. J Virol 2013; 87:13676-93. [PMID: 24109218 DOI: 10.1128/jvi.02331-13] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The complete sequence of retroperitoneal fibromatosis-associated herpesvirus Macaca nemestrina (RFHVMn), the pig-tailed macaque homolog of Kaposi's sarcoma-associated herpesvirus (KSHV), was determined by next-generation sequence analysis of a Kaposi's sarcoma (KS)-like macaque tumor. Colinearity of genes was observed with the KSHV genome, and the core herpesvirus genes had strong sequence homology to the corresponding KSHV genes. RFHVMn lacked homologs of open reading frame 11 (ORF11) and KSHV ORFs K5 and K6, which appear to have been generated by duplication of ORFs K3 and K4 after the divergence of KSHV and RFHV. RFHVMn contained positional homologs of all other unique KSHV genes, although some showed limited sequence similarity. RFHVMn contained a number of candidate microRNA genes. Although there was little sequence similarity with KSHV microRNAs, one candidate contained the same seed sequence as the positional homolog, kshv-miR-K12-10a, suggesting functional overlap. RNA transcript splicing was highly conserved between RFHVMn and KSHV, and strong sequence conservation was noted in specific promoters and putative origins of replication, predicting important functional similarities. Sequence comparisons indicated that RFHVMn and KSHV developed in long-term synchrony with the evolution of their hosts, and both viruses phylogenetically group within the RV1 lineage of Old World primate rhadinoviruses. RFHVMn is the closest homolog of KSHV to be completely sequenced and the first sequenced RV1 rhadinovirus homolog of KSHV from a nonhuman Old World primate. The strong genetic and sequence similarity between RFHVMn and KSHV, coupled with similarities in biology and pathology, demonstrate that RFHVMn infection in macaques offers an important and relevant model for the study of KSHV in humans.
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Gonzalez MW, Spouge JL. Domain analysis of symbionts and hosts (DASH) in a genome-wide survey of pathogenic human viruses. BMC Res Notes 2013; 6:209. [PMID: 23706066 PMCID: PMC3672079 DOI: 10.1186/1756-0500-6-209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 05/17/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND In the coevolution of viruses and their hosts, viruses often capture host genes, gaining advantageous functions (e.g. immune system control). Identifying functional similarities shared by viruses and their hosts can help decipher mechanisms of pathogenesis and accelerate virus-targeted drug and vaccine development. Cellular homologs in viruses are usually documented using pairwise-sequence comparison methods. Yet, pairwise-sequence searches have limited sensitivity resulting in poor identification of divergent homologies. RESULTS Methods based on profiles from multiple sequences provide a more sensitive alternative to identify similarities in host-pathogen systems. The present work describes a profile-based bioinformatics pipeline that we call the Domain Analysis of Symbionts and Hosts (DASH). DASH provides a web platform for the functional analysis of viral and host genomes. This study uses Human Herpesvirus 8 (HHV-8) as a model to validate the methodology. Our results indicate that HHV-8 shares at least 29% of its genes with humans (fourteen immunomodulatory and ten metabolic genes). DASH also suggests functions for fifty-one additional HHV-8 structural and metabolic proteins. We also perform two other comparative genomics studies of human viruses: (1) a broad survey of eleven viruses of disparate sizes and transcription strategies; and (2) a closer examination of forty-one viruses of the order Mononegavirales. In the survey, DASH detects human homologs in 4/5 DNA viruses. None of the non-retro-transcribing RNA viruses in the survey showed evidence of homology to humans. The order Mononegavirales are also non-retro-transcribing RNA viruses, however, and DASH found homology in 39/41 of them. Mononegaviruses display larger fractions of human similarities (up to 75%) than any of the other RNA or DNA viruses (up to 55% and 29% respectively). CONCLUSIONS We conclude that gene sharing probably occurs between humans and both DNA and RNA viruses, in viral genomes of differing sizes, regardless of transcription strategies. Our method (DASH) simultaneously analyzes the genomes of two interacting species thereby mining functional information to identify shared as well as exclusive domains to each organism. Our results validate our approach, showing that DASH has potential as a pipeline for making therapeutic discoveries in other host-symbiont systems. DASH results are available at http://tinyurl.com/spouge-dash.
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Affiliation(s)
- Mileidy W Gonzalez
- National Institutes of Health, National Library of Medicine, National Center for Biotechnology Information, 8600 Rockville Pike, Building 38A, Room 6N611-M, Bethesda, MD 20894, USA.
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PRICE: software for the targeted assembly of components of (Meta) genomic sequence data. G3-GENES GENOMES GENETICS 2013; 3:865-80. [PMID: 23550143 PMCID: PMC3656733 DOI: 10.1534/g3.113.005967] [Citation(s) in RCA: 188] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Low-cost DNA sequencing technologies have expanded the role for direct nucleic acid sequencing in the analysis of genomes, transcriptomes, and the metagenomes of whole ecosystems. Human and machine comprehension of such large datasets can be simplified via synthesis of sequence fragments into long, contiguous blocks of sequence (contigs), but most of the progress in the field of assembly has focused on genomes in isolation rather than metagenomes. Here, we present software for paired-read iterative contig extension (PRICE), a strategy for focused assembly of particular nucleic acid species using complex metagenomic data as input. We describe the assembly strategy implemented by PRICE and provide examples of its application to the sequence of particular genes, transcripts, and virus genomes from complex multicomponent datasets, including an assembly of the BCBL-1 strain of Kaposi's sarcoma-associated herpesvirus. PRICE is open-source and available for free download (derisilab.ucsf.edu/software/price/ or sourceforge.net/projects/pricedenovo/).
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Abstract
Approximately 18% of human cancers have a viral etiology and the majority of these involve transformation of epithelial cells. Viral proteins transform epithelia by inducing alterations in the normal cell growth and differentiation pathways through the targeting of host proteins. Among the DNA viruses responsible for causing carcinomas are the human papillomaviruses as well as several members of the herpes and polyomavirus families. A number of techniques have been developed to study the mechanisms by which viruses immortalize epithelial cells and alter differentiation properties. These methods include the generation of immortalized lines by transfection or infection as well as the use of organotypic raft cultures, suspension in methylcellulose, and treatment with high calcium levels to examine how differentiation is altered.
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Affiliation(s)
- Jennifer A Regan
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
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Smith C, Khanna R. Immune regulation of human herpesviruses and its implications for human transplantation. Am J Transplant 2013; 13 Suppl 3:9-23; quiz 23. [PMID: 23347211 DOI: 10.1111/ajt.12005] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 07/03/2012] [Accepted: 07/16/2012] [Indexed: 01/25/2023]
Abstract
Human herpesviruses including cytomegalovirus, Epstein-Barr virus, HHV6, HHV7, HHV8, Herpes simplex virus (HSV)-1 and HSV-2 and varicella zoster virus (VZV) have developed an intricate relationship with the human immune system. This is characterized by the interplay between viral immune evasion mechanisms that promote the establishment of a lifelong persistent infection and the induction of a broad humoral and cellular immune response, which prevents the establishment of viral disease. Understanding the immune parameters that control herpesvirus infection, and the strategies the viruses use to evade immune recognition, has been critical in understanding why immunological dysfunction in transplant patients can lead to disease, and in the development of immunological strategies to prevent and control herpesvirus associated diseases.
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Affiliation(s)
- C Smith
- Australian Centre for Vaccine Development, Tumour Immunology Laboratory, Department of Immunology, Queensland Institute of Medical Research, Brisbane, Australia
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Knowlton ER, Lepone LM, Li J, Rappocciolo G, Jenkins FJ, Rinaldo CR. Professional antigen presenting cells in human herpesvirus 8 infection. Front Immunol 2013; 3:427. [PMID: 23346088 PMCID: PMC3549500 DOI: 10.3389/fimmu.2012.00427] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2012] [Accepted: 12/24/2012] [Indexed: 12/18/2022] Open
Abstract
Professional antigen presenting cells (APC), i.e., dendritic cells (DC), monocytes/macrophages, and B lymphocytes, are critically important in the recognition of an invading pathogen and presentation of antigens to the T cell-mediated arm of immunity. Human herpesvirus 8 (HHV-8) is one of the few human viruses that primarily targets these APC for infection, altering their cytokine profiles, manipulating their surface expression of MHC molecules, and altering their ability to activate HHV-8-specific T cells. This could be why T cell responses to HHV-8 antigens are not very robust. Of these APC, only B cells support complete, lytic HHV-8 infection. However, both complete and abortive virus replication cycles in APC could directly affect viral pathogenesis and progression to Kaposi's sarcoma (KS) and HHV-8-associated B cell cancers. In this review, we discuss the effects of HHV-8 infection on professional APC and their relationship to the development of KS and B cell lymphomas.
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Affiliation(s)
- Emilee R Knowlton
- Department of Infectious Diseases and Microbiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA, USA
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Sin WX, Li P, Yeong JPS, Chin KC. Activation and regulation of interferon-β in immune responses. Immunol Res 2012; 53:25-40. [PMID: 22411096 DOI: 10.1007/s12026-012-8293-7] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Interferons (IFNs) were discovered more than half a century ago, and extensive research has since identified multifarious roles for type I IFN in human immune responses. Here, we review the functions of IFN-β in innate and adaptive immunity. We also discuss the activation and influence of IFN-β on myeloid cell types, including monocytes and dendritic cells, as well as address the effects of IFN-β on T cells and B cells. Findings from our own laboratory, which explores the molecular mechanisms of IFN-β activation by LPS and viruses, as well as from other groups investigating the regulation of IFN-β by viral proteins and endogenous factors are described. The effects of post-translational modifications of the interferon regulatory factor (IRF)-3 on IFN-β induction are also highlighted. Many unanswered questions remain concerning the regulation of the type I IFN response in inflammation, especially the role of transcription factors in the modulation of inflammatory gene expression, and these questions will form the basis for exciting avenues of future research.
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Affiliation(s)
- Wei-Xiang Sin
- Laboratory of Gene Regulation and Inflammation, Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), 8A Biomedical Grove, #04 Immunos, Biopolis, Singapore
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41
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Dakovic Rode O, Markotic A, Kujundzic Tiljak M, Zidovec Lepej S, Begovac J. Serum apoptosis markers in HIV-infected patients with human herpesvirus type 8 and herpes simplex virus type 2 co-infection. Eur J Clin Microbiol Infect Dis 2012; 31:3303-8. [PMID: 22837067 DOI: 10.1007/s10096-012-1696-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2012] [Accepted: 07/04/2012] [Indexed: 10/28/2022]
Abstract
This study aimed to examine the influence of human herpesvirus type 8 (HHV-8) and herpes simplex virus type 2 (HSV-2) co-infections on apoptosis serum markers in human immunodeficiency virus (HIV)-infected patients. Sera from 110 HIV-infected and 59 HIV-uninfected individuals were analyzed for soluble Fas (sFas), sFas ligand (sFasL), caspase-8, and Bcl-2. The findings of HIV-infected patients with no co-infection (n = 37), HIV-infected patients with HHV-8 co-infection (n = 22), HIV-infected patients with HSV-2 co-infection (n = 51), and patients with HSV-2 co-infection and no HIV infection (n = 20) were compared to controls (reference group) with no HIV, HSV-2, and HHV-8 co-infections (n = 39). Soluble Fas and sFasL concentrations were the highest in HIV and HHV-8 co-infected patients (medians, 912.7 pg/ml and 74.3 pg/mL, respectively). No difference in caspase-8 concentrations was found, whereas Bcl-2 concentrations were the highest in HIV and HHV-8 co-infected individuals. Older age was associated with higher sFas (p < 0.001) and lower sFasL (p = 0.04) concentrations. In a robust regression model adjusted for age, the log-transformed sFas concentrations were significantly lower in HIV-infected patients with no co-infections (β = -0.244; p < 0.001) and higher in HIV and HHV-8 co-infected patients (β = 0.216; p = 0.012) compared to the reference group. Soluble FasL was significantly lower in HIV-infected patients with no co-infections (β = -0.284; p = 0.005) and in HIV-infected patients with HSV-2 co-infection (β = -0.381; p < 0.001) compared to the reference group. Soluble FasL was also higher in HIV and HHV-8 co-infected patients compared to controls (β = 0.248; p = 0.036). Our results suggest that HHV-8 and HSV-2 may have a significant effect on Fas-FasL-mediated apoptosis in HIV-1 patients. HHV-8 upregulates while HSV-2 downregulates sFas and sFasL.
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Affiliation(s)
- O Dakovic Rode
- University Hospital for Infectious Diseases Dr. Fran Mihaljevic, Mirogojska 8, 10000, Zagreb, Croatia.
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ORF45 of Kaposi's sarcoma-associated herpesvirus inhibits phosphorylation of interferon regulatory factor 7 by IKKε and TBK1 as an alternative substrate. J Virol 2012; 86:10162-72. [PMID: 22787218 DOI: 10.1128/jvi.05224-11] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Open reading frame 45 (ORF45) of Kaposi's sarcoma-associated herpesvirus (KSHV) is an immediate-early and tegument protein that plays critical roles in antagonizing host antiviral responses. We have previously shown (Zhu et al, Proc. Natl. Acad. Sci. U. S. A., 99:5573-5578, 2002) that ORF45 suppresses activation of interferon regulatory factor 7 (IRF7), a crucial regulator of type I interferon gene expression, by blocking its virus-induced phosphorylation and nuclear accumulation. We report here further characterization of the mechanisms by which ORF45 inhibits IRF7 phosphorylation. In most cell types, IRF7 is phosphorylated and activated by IKKε and TBK1 after viral infection. We found that phosphorylation of IRF7 on Ser477 and Ser479 by IKKε or TBK1 is inhibited by ORF45. The inhibition is specific to IRF7 because phosphorylation of its close relative IRF3 is not affected by ORF45, implying that ORF45 does not inactivate the kinases directly. In fact, we found that ORF45 is phosphorylated efficiently on Ser41 and Ser162 by IKKε and TBK1. We demonstrated that ORF45 competes with the associated IRF7 and inhibits its phosphorylation by IKKε or TBK1 by acting as an alternative substrate.
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43
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Binding of cellular export factor REF/Aly by Kaposi's sarcoma-associated herpesvirus (KSHV) ORF57 protein is not required for efficient KSHV lytic replication. J Virol 2012; 86:9866-74. [PMID: 22761374 DOI: 10.1128/jvi.01190-12] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) ORF57 protein is expressed early during lytic KSHV replication, enhances expression of many KSHV genes, and is essential for virus production. ORF57 is a member of a family of proteins conserved among all human and many animal herpesviruses that are multifunctional regulators of gene expression and act posttranscriptionally to increase accumulation of their target mRNAs. The mechanism of ORF57 action is complex and may involve effects on mRNA transcription, stability, and export. ORF57 directly binds to REF/Aly, a cellular RNA-binding protein component of the TREX complex that mediates RNA transcription and export. We analyzed the effects of an ORF57 mutation known to abrogate REF/Aly binding and demonstrate that the REF-binding mutant is impaired in activation of viral mRNAs and noncoding RNAs confined to the nucleus. Although the inability to bind REF leads to decreased ORF57 activity in enhancing gene expression, there is no demonstrable effect on nuclear export of viral mRNA or the ability of ORF57 to support KSHV replication and virus production. These data indicate that REF/Aly-ORF57 interaction is not essential for KSHV lytic replication but may contribute to target RNA stability independent of effects on RNA export, suggesting a novel role for REF/Aly in viral RNA metabolism.
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Butler LM, Jeffery HC, Wheat RL, Long HM, Rae PC, Nash GB, Blackbourn DJ. Kaposi's sarcoma-associated herpesvirus inhibits expression and function of endothelial cell major histocompatibility complex class II via suppressor of cytokine signaling 3. J Virol 2012; 86:7158-66. [PMID: 22532676 PMCID: PMC3416330 DOI: 10.1128/jvi.06908-11] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 04/12/2012] [Indexed: 01/03/2023] Open
Abstract
Endothelial cells (EC) can present antigen to either CD8(+) T lymphocytes through constitutively expressed major histocompatibility complex class I (MHC-I) or CD4(+) T lymphocytes through gamma interferon (IFN-γ)-induced MHC-II. Kaposi's sarcoma-associated herpesvirus (KSHV) is the etiological agent of Kaposi's sarcoma (KS), an EC neoplasm characterized by dysregulated angiogenesis and a substantial inflammatory infiltrate. KSHV is understood to have evolved strategies to inhibit MHC-I expression on EC and MHC-II expression on primary effusion lymphoma cells, but its effects on EC MHC-II expression are unknown. Here, we report that the KSHV infection of human primary EC inhibits IFN-γ-induced expression of the MHC-II molecule HLA-DR at the transcriptional level. The effect is functionally significant, since recognition by an HLA-DR-restricted CD4(+) T-cell clone in response to cognate antigen presented by KSHV-infected EC was attenuated. Inhibition of HLA-DR expression was also achieved by exposing EC to supernatant from KSHV-inoculated EC before IFN-γ treatment, revealing a role for soluble mediators. IFN-γ-induced phosphorylation of STAT-1 and transcription of CIITA were suppressed in KSHV-inoculated EC via a mechanism involving SOCS3 (suppressor of cytokine signaling 3). Thus, KSHV infection resulted in transcriptional upregulation of SOCS3, and treatment with RNA interference against SOCS3 relieved virus-induced inhibition of IFN-γ-induced STAT-1 phosphorylation. Since cell surface MHC-II molecules present peptide antigens to CD4(+) T lymphocytes that can function either as direct cytolytic effectors or to initiate and regulate adaptive immune responses, inhibition of this antigen-presenting pathway would provide a survival advantage to the virus.
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Affiliation(s)
| | - H. C. Jeffery
- School of Clinical and Experimental Medicine
- School of Cancer Sciences and CR UK Centre for Cancer Research
| | - R. L. Wheat
- School of Cancer Sciences and CR UK Centre for Cancer Research
| | - H. M. Long
- School of Cancer Sciences and CR UK Centre for Cancer Research
| | - P. C. Rae
- School of Clinical and Experimental Medicine
- School of Cancer Sciences and CR UK Centre for Cancer Research
| | - G. B. Nash
- School of Clinical and Experimental Medicine
| | - D. J. Blackbourn
- School of Cancer Sciences and CR UK Centre for Cancer Research
- MRC Centre for Immune Regulation, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
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Davison AJ. Evolution of sexually transmitted and sexually transmissible human herpesviruses. Ann N Y Acad Sci 2012; 1230:E37-49. [PMID: 22417106 DOI: 10.1111/j.1749-6632.2011.06358.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Herpesviruses occur in an impressively wide range of animals and are associated with various diseases. The numerous routes taken during hundreds of millions of years of evolution have contributed to their striking adaptability and success as pathogens. Herpesviruses share a distinct virion structure and are classified taxonomically into a single order, the Herpesvirales, which is divided into three families. The phylogenetic relationships among members of the most populous family, the Herpesviridae, which includes all nine human herpesviruses, are generally similar to those among their hosts, supporting the view that there has been a large degree of coevolution between virus and host. Three human herpesviruses (human cytomegalovirus, Kaposi's sarcoma-associated herpesvirus, and herpes simplex virus type 1) are classed as agents capable of sexually transmissible infection (StxI), and one (herpes simplex virus type 2) as an agent capable of sexually transmitted infection (STI). The evolutionary characteristics of these viruses are described.
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Affiliation(s)
- Andrew J Davison
- MRC-University of Glasgow Centre for Virus Research, Glasgow, United Kingdom.
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46
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Cho H, Kang H. KSHV infection of B-cell lymphoma using a modified KSHV BAC36 and coculturing system. J Microbiol 2012; 50:285-92. [PMID: 22538658 DOI: 10.1007/s12275-012-1495-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Accepted: 11/15/2011] [Indexed: 10/28/2022]
Abstract
Kaposi's sarcoma-associated herpesvirus (KSHV) is the causative agent of two B cell lymphoproliferative diseases, namely primary effusion lymphoma (PEL) and multicentric Castleman's disease (MCD). KSHV infection of B cell lymphoma in vitro has been a long-standing battle in advancing human KSHV biology. In this study, a modified form of KSHV BAC36 named BAC36A significantly increased the fidelity of gene-targeted site-directed mutagenesis in the KSHV genome. This modification eliminates tedious screening steps required to obtain mutant clones when a KSHV BAC36 reverse genetic system is used. Coculturing B-cell lymphoma BJAB cells with KSHV BAC36A stably transfected 293T cells enabled us to infect BJAB cells with a KSHV virion derived from the KSHV BAC36A. The coculture system produced substantial amounts of KSHV infection to BJAB, meaning that KSHV virions were released from 293T cells and then infected neighboring BJAB cells. Owing to our success with the KSHV BAC36A and coculture system, we propose a new genetic system for the study of KSHV gene expression and regulation in B-cell lymphoma.
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Affiliation(s)
- Hyosun Cho
- College of Pharmacy, Duksung Women's University, Seoul, 132-714, Republic of Korea
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47
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Suppression of antigen-specific T cell responses by the Kaposi's sarcoma-associated herpesvirus viral OX2 protein and its cellular orthologue, CD200. J Virol 2012; 86:6246-57. [PMID: 22491458 DOI: 10.1128/jvi.07168-11] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Regulating appropriate activation of the immune response in the healthy host despite continual immune surveillance dictates that immune responses must be either self-limiting and therefore negatively regulated following their activation or prevented from developing inappropriately. In the case of antigen-specific T cells, their response is attenuated by several mechanisms, including ligation of CTLA-4 and PD-1. Through the study of the viral OX2 (vOX2) immunoregulator encoded by Kaposi's sarcoma-associated herpesvirus (KSHV), we have identified a T cell-attenuating role both for this protein and for CD200, a cellular orthologue of the viral vOX2 protein. In vitro, antigen-presenting cells (APC) expressing either native vOX2 or CD200 suppressed two functions of cognate antigen-specific T cell clones: gamma interferon (IFN-γ) production and mobilization of CD107a, a cytolytic granule component and measure of target cell killing ability. Mechanistically, vOX2 and CD200 expression on APC suppressed the phosphorylation of ERK1/2 mitogen-activated protein kinase in responding T cells. These data provide the first evidence for a role of both KSHV vOX2 and cellular CD200 in the negative regulation of antigen-specific T cell responses. They suggest that KSHV has evolved to harness the host CD200-based mechanism of attenuation of T cell responses to facilitate virus persistence and dissemination within the infected individual. Moreover, our studies define a new paradigm in immune modulation by viruses: the provision of a negative costimulatory signal to T cells by a virus-encoded orthologue of CD200.
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48
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Kim S, Jong JE, Seo T. Viral Interferon Regulatory Factor 1 of Kaposi's Sarcoma-Associated Herpesvirus Interacts with a Translocation Liposarcoma Protein-Associated Serine-Arginine Protein. Osong Public Health Res Perspect 2012; 3:8-13. [PMID: 24159480 PMCID: PMC3738680 DOI: 10.1016/j.phrp.2012.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 01/05/2012] [Accepted: 01/15/2012] [Indexed: 11/26/2022] Open
Abstract
Objectives To confirm that Kaposi’s sarcoma-associated herpes virus openreading frame K9, viral interferon regulatory factor 1 (vIRF1), interacts with splicing factor, translocation liposarcoma protein-associated serine-arginine protein (TASR), in vivo and to establish whether interactions between vIRF1 and TASRs influence alternative splicing. Methods Association between vIRF1 and TASRs was confirmed with the glutathione S-transferase pull-down assay and coimmunoprecipitation. Further colocalization was shown by immunofluorescence. The in vivo splicing assay was performed to confirm the alterations in the splicing pattern. Results vIRF1 interacts with both TASR1 and 2 in vivo. vIRF1 has been shown to colocalize with TASR proteins in 293 T cells. However, an in vivo splicing revealed no alterations in the splicing pattern via interaction. Conclusions The study data suggest that vIRF1 interacts with the TASR protein. However, vIRF1 interactions do not affect TASR-mediated alternative splicing.
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Affiliation(s)
- Sunmi Kim
- Department of Life Science, Dongguk University-Seoul, Seoul, Korea
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49
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Robinson BA, Estep RD, Messaoudi I, Rogers KS, Wong SW. Viral interferon regulatory factors decrease the induction of type I and type II interferon during rhesus macaque rhadinovirus infection. J Virol 2012; 86:2197-211. [PMID: 22156526 PMCID: PMC3302421 DOI: 10.1128/jvi.05047-11] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 11/17/2011] [Indexed: 01/20/2023] Open
Abstract
Kaposi's sarcoma-associated herpesvirus and rhesus macaque rhadinovirus (RRV), two closely related gammaherpesviruses, are unique in their expression of viral homologs of cellular interferon regulatory factors (IRFs), termed viral IRFs (vIRFs). To assess the role of vIRFs during de novo infection, we have utilized the bacterial artificial chromosome clone of wild-type RRV(17577) (WT(BAC) RRV) to generate a recombinant virus with all 8 of the vIRFs deleted (vIRF-ko RRV). The infection of primary rhesus fibroblasts and peripheral blood mononuclear cells (PBMCs) with vIRF-ko RRV resulted in earlier and increased induction of type I interferon (IFN) (IFN-α/β) and type II IFN (IFN-γ). Additionally, plasmacytoid dendritic cells maintained higher levels of IFN-α production in PBMC cultures infected with vIRF-ko RRV than in cultures infected with WT(BAC) RRV. Moreover, the nuclear accumulation of phosphorylated IRF-3, which is necessary for the induction of type I IFN, was also inhibited following WT(BAC) RRV infection. These findings demonstrate that during de novo RRV infection, vIRFs are inhibiting the induction of IFN at the transcriptional level, and one potential mechanism for this is the disruption of the activation and localization of IRF-3.
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Affiliation(s)
- Bridget A. Robinson
- Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, Oregon, USA
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Ryan D. Estep
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Ilhem Messaoudi
- Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, Oregon, USA
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, Oregon, USA
| | - Kelsey S. Rogers
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
| | - Scott W. Wong
- Department of Molecular Microbiology and Immunology, Oregon Health & Science University, Portland, Oregon, USA
- Vaccine and Gene Therapy Institute, Oregon Health & Science University, Beaverton, Oregon, USA
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Beaverton, Oregon, USA
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50
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Szpara ML, Tafuri YR, Parsons L, Shamim SR, Verstrepen KJ, Legendre M, Enquist LW. A wide extent of inter-strain diversity in virulent and vaccine strains of alphaherpesviruses. PLoS Pathog 2011; 7:e1002282. [PMID: 22022263 PMCID: PMC3192842 DOI: 10.1371/journal.ppat.1002282] [Citation(s) in RCA: 122] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Accepted: 08/10/2011] [Indexed: 12/17/2022] Open
Abstract
Alphaherpesviruses are widespread in the human population, and include herpes simplex virus 1 (HSV-1) and 2, and varicella zoster virus (VZV). These viral pathogens cause epithelial lesions, and then infect the nervous system to cause lifelong latency, reactivation, and spread. A related veterinary herpesvirus, pseudorabies (PRV), causes similar disease in livestock that result in significant economic losses. Vaccines developed for VZV and PRV serve as useful models for the development of an HSV-1 vaccine. We present full genome sequence comparisons of the PRV vaccine strain Bartha, and two virulent PRV isolates, Kaplan and Becker. These genome sequences were determined by high-throughput sequencing and assembly, and present new insights into the attenuation of a mammalian alphaherpesvirus vaccine strain. We find many previously unknown coding differences between PRV Bartha and the virulent strains, including changes to the fusion proteins gH and gB, and over forty other viral proteins. Inter-strain variation in PRV protein sequences is much closer to levels previously observed for HSV-1 than for the highly stable VZV proteome. Almost 20% of the PRV genome contains tandem short sequence repeats (SSRs), a class of nucleic acids motifs whose length-variation has been associated with changes in DNA binding site efficiency, transcriptional regulation, and protein interactions. We find SSRs throughout the herpesvirus family, and provide the first global characterization of SSRs in viruses, both within and between strains. We find SSR length variation between different isolates of PRV and HSV-1, which may provide a new mechanism for phenotypic variation between strains. Finally, we detected a small number of polymorphic bases within each plaque-purified PRV strain, and we characterize the effect of passage and plaque-purification on these polymorphisms. These data add to growing evidence that even plaque-purified stocks of stable DNA viruses exhibit limited sequence heterogeneity, which likely seeds future strain evolution. Alphaherpesviruses such as herpes simplex virus (HSV) are ubiquitous in the human population. HSV causes oral and genital lesions, and has co-morbidities in acquisition and spread of human immunodeficiency virus (HIV). The lack of a vaccine for HSV hinders medical progress for both of these infections. A related veterinary alphaherpesvirus, pseudorabies virus (PRV), has long served as a model for HSV vaccine development, because of their similar pathogenesis, neuronal spread, and infectious cycle. We present here the first full genome characterization of a live PRV vaccine strain, Bartha, and reveal a spectrum of unique mutations that are absent from two divergent wild-type PRV strains. These mutations can now be examined individually for their contribution to vaccine strain attenuation and for potential use in HSV vaccine development. These inter-strain comparisons also revealed an abundance of short repetitive elements in the PRV genome, a pattern which is repeated in other herpesvirus genomes and even the unrelated Mimivirus. We provide the first global characterization of repeats in viruses, comparing both their presence and their variation among different viral strains and species. Repetitive elements such as these have been shown to serve as hotspots of variation between individuals or strains of other organisms, generating adaptations or even disease states through changes in length of DNA-binding sites, protein folding motifs, and other structural elements. These data suggest for the first time that similar mechanisms could be widely distributed in viral biology as well.
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Affiliation(s)
- Moriah L. Szpara
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
- Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America
| | - Yolanda R. Tafuri
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
| | - Lance Parsons
- Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey, United States of America
| | - S. Rafi Shamim
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
| | - Kevin J. Verstrepen
- VIB lab for Systems Biology and CMPG Lab for Genetics and Genomics, KULeuven, Gaston Geenslaan 1, Leuven, Belgium
| | - Matthieu Legendre
- Structural & Genomic Information Laboratory (CNRS, UPR2589), Mediterranean Institute of Microbiology, Aix-Marseille Université, Marseille, France
| | - L. W. Enquist
- Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America
- Princeton Neuroscience Institute, Princeton University, Princeton, New Jersey, United States of America
- * E-mail:
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