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Xie M. Virus-Induced Cell Fusion and Syncytia Formation. Results Probl Cell Differ 2024; 71:283-318. [PMID: 37996683 DOI: 10.1007/978-3-031-37936-9_14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
Most enveloped viruses encode viral fusion proteins to penetrate host cell by membrane fusion. Interestingly, many enveloped viruses can also use viral fusion proteins to induce cell-cell fusion, both in vitro and in vivo, leading to the formation of syncytia or multinucleated giant cells (MGCs). In addition, some non-enveloped viruses encode specialized viral proteins that induce cell-cell fusion to facilitate viral spread. Overall, viruses that can induce cell-cell fusion are nearly ubiquitous in mammals. Virus cell-to-cell spread by inducing cell-cell fusion may overcome entry and post-entry blocks in target cells and allow evasion of neutralizing antibodies. However, molecular mechanisms of virus-induced cell-cell fusion remain largely unknown. Here, I summarize the current understanding of virus-induced cell fusion and syncytia formation.
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Affiliation(s)
- Maorong Xie
- Division of Infection and Immunity, UCL, London, UK.
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2
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Priščáková P, Svoboda M, Feketová Z, Hutník J, Repiská V, Gbelcová H, Gergely L. Syncytin-1, syncytin-2 and suppressyn in human health and disease. J Mol Med (Berl) 2023; 101:1527-1542. [PMID: 37855856 PMCID: PMC10697888 DOI: 10.1007/s00109-023-02385-6] [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: 03/24/2023] [Revised: 10/06/2023] [Accepted: 10/09/2023] [Indexed: 10/20/2023]
Abstract
In this review, we summarized the results of experimental and clinical studies about three human endogenous retroviruses and their products-syncytin-1, syncytin-2, and suppressyn in human physiology and pathophysiology. We summed up the described connection with various pathological processes and diseases, mainly with pregnancy-induced hypertensive diseases such as preeclampsia, oncogenesis, gestational trophoblastic disease, and multiple sclerosis. Supposed mechanisms of action and the potential of clinical applications are also described.
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Affiliation(s)
- Petra Priščáková
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Michal Svoboda
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Zuzana Feketová
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Juraj Hutník
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Vanda Repiská
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Helena Gbelcová
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic
| | - Lajos Gergely
- Institute of Medical Biology, Genetics and Clinical Genetics, Faculty of Medicine, Comenius University Bratislava, Sasinkova 4, Bratislava, 811 08, Slovak Republic.
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Wang Q, Shi Y, Bian Q, Zhang N, Wang M, Wang J, Li X, Lai L, Zhao Z, Yu H. Molecular mechanisms of syncytin-1 in tumors and placental development related diseases. Discov Oncol 2023; 14:104. [PMID: 37326913 DOI: 10.1007/s12672-023-00702-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2023] [Accepted: 05/25/2023] [Indexed: 06/17/2023] Open
Abstract
Human endogenous retroviruses (HERVs) have evolved from exogenous retroviruses and account for approximately 8% of the human genome. A growing number of findings suggest that the abnormal expression of HERV genes is associated with schizophrenia, multiple sclerosis, endometriosis, breast cancer, bladder cancer and other diseases. HERV-W env (syncytin-1) is a membrane glycoprotein which plays an important role in placental development. It includes embryo implantation, fusion of syncytiotrophoblasts and of fertilized eggs, and immune response. The abnormal expression of syncytin-1 is related to placental development-related diseases such as preeclampsia, infertility, and intrauterine growth restriction, as well as tumors such as neuroblastoma, endometrial cancer, and endometriosis. This review mainly focused on the molecular interactions of syncytin-1 in placental development-related diseases and tumors, to explore whether syncytin-1 can be an emerging biological marker and potential therapeutic target.
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Affiliation(s)
- Qianqian Wang
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Ying Shi
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Qiang Bian
- Collaborative Innovation Center, Jining Medical University, Jining, 272067, Shandong, People's Republic of China
- Department of Pathophysiology, Weifang Medical University, Weifang, 261053, Shandong, People's Republic of China
| | - Naibin Zhang
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Meng Wang
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Jianing Wang
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Xuan Li
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China
| | - Luhao Lai
- Collaborative Innovation Center, Jining Medical University, Jining, 272067, Shandong, People's Republic of China
| | - Zhankui Zhao
- The Affiliated Hospital of Jining Medical University, Jining Medical University, 89 Guhuai Road, Jining, 272029, Shandong, People's Republic of China.
| | - Honglian Yu
- Department of Biochemistry, Jining Medical University, 133 Hehua Road, Jining, 272067, Shandong, People's Republic of China.
- Collaborative Innovation Center, Jining Medical University, Jining, 272067, Shandong, People's Republic of China.
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Wu Q, Chen L, Song Y, Zhu J, Chen Y, Sun P. Expression pattern Nanog is associated with the development of gestational trophoblastic neoplasia in Chinese women from Fujian province: a case-control study. Gynecol Endocrinol 2021; 37:108-112. [PMID: 32584203 DOI: 10.1080/09513590.2020.1781080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
BACKGROUND Gestational trophoblastic disease (GTD) is a group of interrelated but distinct diseases and has a serious impact on the reproductive health of women. To analyze the expression of Nanog in GTD and to evaluate its potential to predict the development of gestational trophoblastic neoplasia (GTN). METHODS The study included 41 normal first-trimester placentas matched by gestational age to 53 regressed-hydatidiform-moles (rHMs), 56 malignant-HMs (mHMs) and 17 choriocarcinomas (CCAs) and evaluated the Nanog expression by immunohistochemistry. The chi-square test, ANOVA, Fisher's exact test and logistic regression were performed to assess the Nanog expression and clinical prognostic factors in GTD. RESULTS Compared to normal placenta levels, the Nanog expression was increased in GTD samples (p < .05). In HMs, Nanog expression was positively correlated with serum β-hCG levels,uterine size and theca-lutein cysts (p < .05). Compared with the low-risk metastatic group (Federation of Gynecology and Obstetrics (FIGO) score ≤ 6), the high-risk metastatic group (FIGO score >7) had higher Nanog expression (p = .030). Moreover, logistic regression analysis showed that the positive expression of Nanog had the highest risk of developing into GTN (OR = 4.764, p < .001). CONCLUSIONS Nanog is an independent predictor of clinical outcomes. It can also be a reliable predictor for GTN development from GTD.
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Affiliation(s)
- Qibin Wu
- Department of Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Lihua Chen
- Department of Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Yiyi Song
- Department of Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Jianfang Zhu
- Department of Pathology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Yaojia Chen
- Department of Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
| | - Pengming Sun
- Department of Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, China
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Xue Y, Sun R, Zheng W, Yang L, An R. Forskolin promotes vasculogenic mimicry and invasion via Notch‑1‑activated epithelial‑to‑mesenchymal transition in syncytiolization of trophoblast cells in choriocarcinoma. Int J Oncol 2020; 56:1129-1139. [PMID: 32319581 PMCID: PMC7115352 DOI: 10.3892/ijo.2020.4997] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 01/23/2020] [Indexed: 02/06/2023] Open
Abstract
Choriocarcinoma (CC) is characterized by earlier blood metastasis compared with other female genital tumors and a high incidence of massive hemorrhage. Vasculogenic mimicry (VM) is highly associated with metastasis, and syncytiotrophoblast is involved in the formation of VM in CC. Forskolin is a typical activator of the cAMP pathway, which is involved in the syncytiolization of trophoblastic cells. In the present study, to determine the effects and mechanism of forskolin on cell invasion and VM during syncytiolization in vitro and in vivo, JEG-3 and JAR cell lines were treated with 100 µM forskolin for 48 h, and wound healing and invasion assays were used to verify cell migratory and invasive capacities. A 3D culture and tube formation assays were established to detect VM. Variation of morphology and markers of the epithelial-to-mesenchymal transition (EMT) were assessed, and the role of the Notch signaling pathway was investigated in CC cells treated with forskolin. The results of the present study demonstrated that 100 µM forskolin induced syncytiolization of trophoblastic cells and enhanced the migratory and invasive abilities of JEG-3 and JAR cell lines. In addition, the capacity of VM was significantly increased, whereas tube formation ability was decreased by forskolin in vitro and in vivo compared with the respective control groups. The cellular morphology exhibited EMT during the syncytiolization process, which was further supported by the changes in EMT marker expression, including downregulation of E-cadherin and cytokeratin and upregulation of N-cadherin, vimentin and zinc finger E-box-binding homeobox 1. The Notch-1 signaling pathway was activated to induce EMT in forskolin-induced VM process in CC cells, and VM and EMT could be reversed by using the γ-secretase inhibitor DAPT to block the Notch-1 pathway. Overall, the results of the present study demonstrated that forskolin enhanced the capacity of VM formation and metastasis through Notch-1-activated EMT in the syncytiolization of trophoblastic cells.
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Affiliation(s)
- Yan Xue
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Rong Sun
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Wei Zheng
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Lei Yang
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
| | - Ruifang An
- Department of Gynecology and Obstetrics, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shaanxi 710061, P.R. China
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Bergallo M, Marozio L, Botta G, Tancredi A, Daprà V, Galliano I, Montanari P, Coscia A, Benedetto C, Tovo PA. Human Endogenous Retroviruses Are Preferentially Expressed in Mononuclear Cells From Cord Blood Than From Maternal Blood and in the Fetal Part of Placenta. Front Pediatr 2020; 8:244. [PMID: 32478020 PMCID: PMC7240011 DOI: 10.3389/fped.2020.00244] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 04/20/2020] [Indexed: 12/11/2022] Open
Abstract
Background: Placenta shows high transcription levels of human endogenous retroviruses (HERVs) that are overexpressed during embryonic and fetal development. Methods: In order to gather further information on the degree of HERV activation in maternal and fetal tissues we assessed the transcription levels of pol genes of HERV-H, -K, and -W in PBMCs of newborns and their mothers as well as in chorion (fetal part) and decidua basalis (maternal part) of the placenta using a real time PCR assay. Results: Transcripts of pol genes of the three HERV families were significantly higher in mononuclear cells from cord blood than from maternal blood and in the fetal part than in the maternal part of the placenta. Conclusions: The HERV over-expressions in cells and tissues of the offspring are further clues that they play pivotal physiologic roles during early life events and suggest that HERV-driven abnormalities of pregnancy and fetal development may derive mostly from the conceptus, not from the mother.
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Affiliation(s)
- Massimiliano Bergallo
- Pediatric Laboratory, Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy.,Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
| | - Luca Marozio
- Department of Surgical Sciences, Obstetrics and Gynecology 1, University of Turin, Turin, Italy
| | - Giovanni Botta
- Department of Pathology AOU Città della Salute e della Scienza di Torino, Turin, Italy
| | - Annalisa Tancredi
- Department of Surgical Sciences, Obstetrics and Gynecology 1, University of Turin, Turin, Italy
| | - Valentina Daprà
- Pediatric Laboratory, Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy.,Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
| | - Ilaria Galliano
- Pediatric Laboratory, Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy.,Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
| | - Paola Montanari
- Pediatric Laboratory, Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy.,Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
| | - Alessandra Coscia
- Neonatology Unit, Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
| | - Chiara Benedetto
- Department of Surgical Sciences, Obstetrics and Gynecology 1, University of Turin, Turin, Italy
| | - Pier Angelo Tovo
- Department of Pediatric Sciences and Public Health, University of Turin, Turin, Italy
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Close to the Bedside: A Systematic Review of Endogenous Retroviruses and Their Impact in Oncology. J Surg Res 2019; 240:145-155. [PMID: 30933828 DOI: 10.1016/j.jss.2019.02.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2018] [Revised: 12/22/2018] [Accepted: 02/04/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND Human endogenous retroviruses (HERVs) are genetic elements in the human genome, which resulted from ancient retroviral germline infections. HERVs have strong transcriptional promoters and enhancers that affect a cell's transcriptome. They also encode proteins that can exert effects in human cells. This review examines how our increased understanding of HERVs have led to their potential use as biomarkers and immunologic targets. MATERIAL AND METHODS PubMed/Medline, Embase, Web of Science, and Cochrane databases were used in a systematic search to identify all articles studying the potential impact of HERVs on surgical diseases. The search included studies that involved clinical patient samples in diseases including cancer, inflammatory conditions, and autoimmune disease. Articles focused on conditions not routinely managed by surgeons were excluded. RESULTS Eighty six articles met inclusion and quality criteria for this review and were included. Breast cancer and melanoma have robust evidence regarding the use of HERVs as potential tumor markers and immunologic targets. Reported evidence of the activity of HERVs in colorectal cancer, pancreatic cancer, hepatocellular cancer, prostate and ovarian cancer, germ cell tumors as well as idiopathic pulmonary hypertension, and the inflammatory response in burns was also reviewed. CONCLUSIONS Increasingly convincing evidence indicates that HERVs may play a role in solid organ malignancy and present important biomarkers or immunologic targets in multiple cancers. Innovative investigation of HERVs is a valuable focus of translational research and can deepen our understanding of cellular physiology and the effects of endogenous retroviruses on human biology. As strategies for treatment continue to focus on genome-based interventions, understanding the impact of endogenous retroviruses on human disease will be critical.
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Bustamante Rivera YY, Brütting C, Schmidt C, Volkmer I, Staege MS. Endogenous Retrovirus 3 - History, Physiology, and Pathology. Front Microbiol 2018; 8:2691. [PMID: 29379485 PMCID: PMC5775217 DOI: 10.3389/fmicb.2017.02691] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 12/26/2017] [Indexed: 01/05/2023] Open
Abstract
Endogenous viral elements (EVE) seem to be present in all eukaryotic genomes. The composition of EVE varies between different species. The endogenous retrovirus 3 (ERV3) is one of these elements that is present only in humans and other Catarrhini. Conservation of ERV3 in most of the investigated Catarrhini and the expression pattern in normal tissues suggest a putative physiological role of ERV3. On the other hand, ERV3 has been implicated in the pathogenesis of auto-immunity and cancer. In the present review we summarize knowledge about this interesting EVE. We propose the model that expression of ERV3 (and probably other EVE loci) under pathological conditions might be part of a metazoan SOS response.
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Affiliation(s)
| | - Christine Brütting
- Department of Paediatrics I, Martin Luther University Halle-Wittenberg, Halle, Germany.,Department of Neurology, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Caroline Schmidt
- Department of Paediatrics I, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Ines Volkmer
- Department of Paediatrics I, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Martin S Staege
- Department of Paediatrics I, Martin Luther University Halle-Wittenberg, Halle, Germany
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Abstract
Cell-cell fusion is essential for fertilization and organ development. Dedicated proteins known as fusogens are responsible for mediating membrane fusion. However, until recently, these proteins either remained unidentified or were poorly understood at the mechanistic level. Here, we review how fusogens surmount multiple energy barriers to mediate cell-cell fusion. We describe how early preparatory steps bring membranes to a distance of ∼10 nm, while fusogens act in the final approach between membranes. The mechanical force exerted by cell fusogens and the accompanying lipidic rearrangements constitute the hallmarks of cell-cell fusion. Finally, we discuss the relationship between viral and eukaryotic fusogens, highlight a classification scheme regrouping a superfamily of fusogens called Fusexins, and propose new questions and avenues of enquiry.
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Affiliation(s)
- Javier M Hernández
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, D-44227 Dortmund, Germany
| | - Benjamin Podbilewicz
- Department of Biology, Technion - Israel Institute of Technology, Haifa 32000, Israel
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Hurst TP, Magiorkinis G. Epigenetic Control of Human Endogenous Retrovirus Expression: Focus on Regulation of Long-Terminal Repeats (LTRs). Viruses 2017; 9:v9060130. [PMID: 28561791 PMCID: PMC5490807 DOI: 10.3390/v9060130] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2017] [Revised: 05/22/2017] [Accepted: 05/22/2017] [Indexed: 12/25/2022] Open
Abstract
Transposable elements, including endogenous retroviruses (ERVs), comprise almost 45% of the human genome. This could represent a significant pathogenic burden but it is becoming more evident that many of these elements have a positive contribution to make to normal human physiology. In particular, the contributions of human ERVs (HERVs) to gene regulation and the expression of noncoding RNAs has been revealed with the help of new and emerging genomic technologies. HERVs have the common provirus structure of coding open reading frames (ORFs) flanked by two long-terminal repeats (LTRs). However, over the course of evolution and as a consequence of host defence mechanisms, most of the sequences contain INDELs, mutations or have been reduced to single LTRs by recombination. These INDELs and mutations reduce HERV activity. However, there is a trade-off for the host cells in that HERVs can provide beneficial sources of genetic variation but with this benefit comes the risk of pathogenic activity and spread within the genome. For example, the LTRs are of critical importance as they contain promoter sequences and can regulate not only HERV expression but that of human genes. This is true even when the LTRs are located in intergenic regions or are in antisense orientation to the rest of the gene. Uncontrolled, this promoter activity could disrupt normal gene expression or transcript processing (e.g., splicing). Thus, control of HERVs and particularly their LTRs is essential for the cell to manage these elements and this control is achieved at multiple levels, including epigenetic regulations that permit HERV expression in the germline but silence it in most somatic tissues. We will discuss some of the common epigenetic mechanisms and how they affect HERV expression, providing detailed discussions of HERVs in stem cell, placenta and cancer biology.
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Affiliation(s)
- Tara P Hurst
- Department of Zoology, University of Oxford, Oxford OX1 3PS, UK.
| | - Gkikas Magiorkinis
- Department of Zoology, University of Oxford, Oxford OX1 3PS, UK.
- Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece.
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Contribution of Syncytins and Other Endogenous Retroviral Envelopes to Human Placenta Pathologies. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2017; 145:111-162. [DOI: 10.1016/bs.pmbts.2016.12.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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