1
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Diot C, Cosentino G, Rameix-Welti MA. Ribonucleoprotein transport in Negative Strand RNA viruses. Biol Cell 2023; 115:e2200059. [PMID: 36192136 DOI: 10.1111/boc.202200059] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Revised: 08/01/2022] [Accepted: 09/09/2022] [Indexed: 01/07/2023]
Abstract
Negative-sense, single-stranded RNA (-ssRNA) viruses comprise some of the deadliest human pathogens (Ebola, rabies, influenza A viruses etc.). Developing therapeutic tools relies on a better understanding of their multiplication cycle. For these viruses, the genome replication and transcription activities most-often segregate in membrane-less environments called inclusion bodies (IBs) or viral factories. These "organelles" usually locate far from the cell surface from where new virions are released, and -ssRNA viruses do not encode for transport factors. The efficient trafficking of the genome progeny toward the cell surface is most often ensured by mechanisms co-opting the cellular machineries. In this review, for each -ssRNA viral family, we cover the methods employed to characterize these host-virus interactions, the strategies used by the viruses to promote the virus genome transport, and the current gaps in the literature. Finally, we highlight how Rab11 has emerged as a target of choice for the intracellular transport of -ssRNA virus genomes.
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Affiliation(s)
- Cédric Diot
- Université Paris-Saclay - Université de Versailles St. Quentin, UMR 1173 (2I), INSERM, Montigny-le-Bretonneux, France
| | - Gina Cosentino
- Université Paris-Saclay - Université de Versailles St. Quentin, UMR 1173 (2I), INSERM, Montigny-le-Bretonneux, France
| | - Marie-Anne Rameix-Welti
- Université Paris-Saclay - Université de Versailles St. Quentin, UMR 1173 (2I), INSERM, Montigny-le-Bretonneux, France.,Assistance Publique des Hôpitaux de Paris, Hôpital Ambroise Paré, Laboratoire de Microbiologie, DMU15, Versailles, France
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2
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Gunkel P, Cordes VC. ZC3HC1 is a structural element of the nuclear basket effecting interlinkage of TPR polypeptides. Mol Biol Cell 2022; 33:ar82. [PMID: 35609216 DOI: 10.1091/mbc.e22-02-0037] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The nuclear basket (NB), anchored to the nuclear pore complex (NPC), is commonly looked upon as a structure built solely of protein TPR polypeptides, the latter thus regarded as the NB's only scaffold-forming components. In the current study, we report ZC3HC1 as a second structural element of the NB. Recently described as an NB-appended protein omnipresent in vertebrates, we now show that ZC3HC1, both in vivo and in vitro, enables in a stepwise manner the recruitment of TPR subpopulations to the NB and their linkage to already NPC-anchored TPR polypeptides. We further demonstrate that the degron-mediated rapid elimination of ZC3HC1 results in the prompt detachment of the ZC3HC1-appended TPR polypeptides from the NB and their release into the nucleoplasm, underscoring the role of ZC3HC1 as a natural structural element of the NB. Finally, we show that ZC3HC1 can keep TPR polypeptides positioned and linked to each other even at sites remote from the NB, in line with ZC3HC1 functioning as a protein connecting TPR polypeptides.
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Affiliation(s)
- Philip Gunkel
- Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
| | - Volker C Cordes
- Max Planck Institute for Multidisciplinary Sciences, 37077 Göttingen, Germany
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3
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A Human Endogenous Bornavirus-Like Nucleoprotein Encodes a Mitochondrial Protein Associated with Cell Viability. J Virol 2021; 95:e0203020. [PMID: 33952640 DOI: 10.1128/jvi.02030-20] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Endogenous retroviruses (ERVs) are sequences in animal genomes that originated from ancient retrovirus infections; they provide genetic novelty in hosts by being coopted as functional genes or elements during evolution. Recently, we demonstrated that endogenous elements from not only from retroviruses but also nonretroviral RNA viruses are a possible source of functional genes in host animals. The remnants of ancient bornavirus infections, called endogenous bornavirus-like elements (EBLs), are present in the genomes of a wide variety of vertebrate species, and some express functional products in host cells. Previous studies have predicted that the human EBL locus derived from bornavirus nucleoprotein, termed hsEBLN-2, expresses mRNA encoding a protein, suggesting that hsEBLN-2 has acquired a cellular function during evolution. However, the detailed function of the hsEBLN-2-derived product remains to be elucidated. In this study, we show that the hsEBLN-2-derived protein E2 acts as a mitochondrial protein that interacts with mitochondrial host factors associated with apoptosis, such as HAX-1. We also demonstrate that knockdown of hsEBLN-2-derived RNA increased the levels of PARP and caspase-3 cleavage and markedly decreased cell viability. In contrast, overexpression of E2 enhanced cell viability, as well as the intracellular stability of HAX-1, under stress conditions. Our results suggest that hsEBLN-2 has been coopted as a host gene, the product of which is involved in cell viability by interacting with mitochondrial proteins. IMPORTANCE Our genomes contain molecular fossils of ancient viruses, called endogenous virus elements (EVEs). Mounting evidence suggests that EVEs derived from nonretroviral RNA viruses have acquired functions in host cells during evolution. Previous studies have revealed that a locus encoding a bornavirus-derived EVE, hsEBLN-2, which was generated approximately 43 million years ago in a human ancestor, may be linked to the development of some tumors. However, the function of hsEBLN-2 has not been determined. In this study, we found that the E2 protein, an expression product of hsEBLN-2, interacts with apoptosis-related host proteins as a mitochondrial protein and affects cell viability. This study suggests that nonretroviral RNA viral EVEs have been coopted by hosts with more diverse functions than previously thought, showing a pivotal role for RNA virus infection in evolution.
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4
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Carmell N, Rominiyi O, Myers KN, McGarrity-Cottrell C, Vanderlinden A, Lad N, Perroux-David E, El-Khamisy SF, Fernando M, Finegan KG, Brown S, Collis SJ. Identification and Validation of ERK5 as a DNA Damage Modulating Drug Target in Glioblastoma. Cancers (Basel) 2021; 13:cancers13050944. [PMID: 33668183 PMCID: PMC7956595 DOI: 10.3390/cancers13050944] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Revised: 02/18/2021] [Accepted: 02/22/2021] [Indexed: 12/22/2022] Open
Abstract
Simple Summary Glioblastomas are high-grade brain tumours and are the most common form of malignancy arising in the brain. Patient survival has improved little over the last 40 years, highlighting an urgent unmet need for more effective treatments for these tumours. Current standard-of-care treatment involves surgical removal of as much of the tumour as possible followed by a course of chemo-/radiotherapy. The main chemotherapeutic drug used is called temozolomide, however even with this treatment regimen, the average patient survival following diagnosis is around 15 months. We have identified a protein called ERK5 which is present at higher levels in these high-grade brain tumours compared to normal brain tissue, and which is also associated with resistance to temozolomide and poor patient survival. Additionally, we show that targeting ERK5 in brain tumour cells can improve the effectiveness of temozolomide in killing these tumour cells and offers potential much-needed future clinical benefit to patients diagnosed with glioblastoma. Abstract Brain tumours kill more children and adults under 40 than any other cancer, with approximately half of primary brain tumours being diagnosed as high-grade malignancies known as glioblastomas. Despite de-bulking surgery combined with chemo-/radiotherapy regimens, the mean survival for these patients is only around 15 months, with less than 10% surviving over 5 years. This dismal prognosis highlights the urgent need to develop novel agents to improve the treatment of these tumours. To address this need, we carried out a human kinome siRNA screen to identify potential drug targets that augment the effectiveness of temozolomide (TMZ)—the standard-of-care chemotherapeutic agent used to treat glioblastoma. From this we identified ERK5/MAPK7, which we subsequently validated using a range of siRNA and small molecule inhibitors within a panel of glioma cells. Mechanistically, we find that ERK5 promotes efficient repair of TMZ-induced DNA lesions to confer cell survival and clonogenic capacity. Finally, using several glioblastoma patient cohorts we provide target validation data for ERK5 as a novel drug target, revealing that heightened ERK5 expression at both the mRNA and protein level is associated with increased tumour grade and poorer patient survival. Collectively, these findings provide a foundation to develop clinically effective ERK5 targeting strategies in glioblastomas and establish much-needed enhancement of the therapeutic repertoire used to treat this currently incurable disease.
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Affiliation(s)
- Natasha Carmell
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Ola Rominiyi
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
- Department of Neurosurgery, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield S10 2JF, UK
| | - Katie N. Myers
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Connor McGarrity-Cottrell
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Aurelie Vanderlinden
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Nikita Lad
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Eva Perroux-David
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
| | - Sherif F. El-Khamisy
- Sheffield Institute for Nucleic Acids (SInFoNiA) and the Healthy Lifespan Institute, University of Sheffield, Sheffield S10 2TN, UK;
- Institute of Cancer Therapeutics, University of Bradford, Bradford BD7 1DP, UK
| | - Malee Fernando
- Department of Histopathology, Royal Hallamshire Hospital, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield S10 2TN, UK;
| | - Katherine G. Finegan
- Faculty of Biology Medicine and Health, University of Manchester, Manchester M13 9PL, UK;
| | - Stephen Brown
- Department of Biomedical Science, The Sheffield RNAi Screening Facility, The University of Sheffield, Sheffield S10 2TN, UK;
| | - Spencer J. Collis
- Weston Park Cancer Centre, Department of Oncology & Metabolism, The University of Sheffield Medical School, Sheffield S10 2SJ, UK; (N.C.); (O.R.); (K.N.M.); (C.M.-C.); (A.V.); (N.L.); (E.P.-D.)
- Sheffield Institute for Nucleic Acids (SInFoNiA) and the Healthy Lifespan Institute, University of Sheffield, Sheffield S10 2TN, UK;
- Correspondence: ; Tel.: +44-(0)114-215-9043
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5
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Nobach D, Müller J, Tappe D, Herden C. Update on immunopathology of bornavirus infections in humans and animals. Adv Virus Res 2020; 107:159-222. [PMID: 32711729 DOI: 10.1016/bs.aivir.2020.06.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Knowledge on bornaviruses has expanded tremendously during the last decade through detection of novel bornaviruses and endogenous bornavirus-like elements in many eukaryote genomes, as well as by confirmation of insectivores as reservoir species for classical Borna disease virus 1 (BoDV-1). The most intriguing finding was the demonstration of the zoonotic potential of lethal human bornavirus infections caused by a novel bornavirus of different squirrel species (variegated squirrel 1 bornavirus, VSBV-1) and by BoDV-1 known as the causative agent for the classical Borna disease in horses and sheep. Whereas a T cell-mediated immunopathology has already been confirmed as key disease mechanism for infection with BoDV-1 by experimental studies in rodents, the underlying pathomechanisms remain less clear for human bornavirus infections, infection with other bornaviruses or infection of reservoir species. Thus, an overview of current knowledge on the pathogenesis of bornavirus infections focusing on immunopathology is given.
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Affiliation(s)
- Daniel Nobach
- Institute of Veterinary Pathology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Jana Müller
- Institute of Veterinary Pathology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Dennis Tappe
- Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany
| | - Christiane Herden
- Institute of Veterinary Pathology, Justus-Liebig-University Giessen, Giessen, Germany; Center for Brain, Mind and Behavior, Justus-Liebig-University Giessen, Giessen, Germany.
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6
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[Virus-host coevolution: Endogenous RNA viral elements as pseudogenes]. Uirusu 2020; 70:49-56. [PMID: 33967113 DOI: 10.2222/jsv.70.49] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
RNA viruses do not need to take the form of DNAs, and RNAs alone complete their replication cycles. On the other hand, since the 1970s, it has been known that DNA fragments derived from RNA viruses can be detected in RNA virus-infected cells. Furthermore, in this decade, it has become clear that the eukaryotic genomes contain genetic sequences derived from non-retroviral RNA viruses. The DNA sequences derived from these RNA viruses are thought to be generatedby using a transposable mechanism of retrotransposon, such as LINE-1. Many endogenous RNA viral sequences are formed by the same mechanism as processed pseudogenes in eukaryotic cells, but the significance of the production of RNA viral "pseudogenes " in infected cells has not been elucidated. We have discovered endogenous bornavirus-like elements (EBLs), which derived from a negative-sense, single-stranded RNA virus, Bornaviruses, and have studied the evolution and function of EBLs in host animals. The analysis of EBLs provides us a clue to unravel the history of host-RNA virus coexistence. In this review, I overview about the function of endogenous RNA virus sequences, especially EBLs in mammalian genomes, and discuss the significance of endogenization of RNA viruses as viral pseudogenes in evolution.
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7
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Medina EM, Walsh E, Buchler NE. Evolutionary innovation, fungal cell biology, and the lateral gene transfer of a viral KilA-N domain. Curr Opin Genet Dev 2019; 58-59:103-110. [PMID: 31600629 DOI: 10.1016/j.gde.2019.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/27/2019] [Accepted: 08/31/2019] [Indexed: 10/25/2022]
Abstract
Fungi are found in diverse ecological niches as primary decomposers, mutualists, or parasites of plants and animals. Although animals and fungi share a common ancestor, fungi dramatically diversified their life cycle, cell biology, and metabolism as they evolved and colonized new niches. This review focuses on a family of fungal transcription factors (Swi4/Mbp1, APSES, Xbp1, Bqt4) derived from the lateral gene transfer of a KilA-N domain commonly found in prokaryotic and eukaryotic DNA viruses. These virus-derived fungal regulators play central roles in cell cycle, morphogenesis, sexual differentiation, and quiescence. We consider the possible origins of KilA-N and how this viral DNA binding domain came to be intimately associated with fungal processes.
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Affiliation(s)
- Edgar M Medina
- University Program in Genetics and Genomics, Duke University, Durham, NC 27710, USA
| | - Evan Walsh
- Bioinformatics Program, North Carolina State University, Raleigh, NC 27607, USA
| | - Nicolas E Buchler
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC 27606, USA.
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8
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Kirsip H, Abroi A. Protein Structure-Guided Hidden Markov Models (HMMs) as A Powerful Method in the Detection of Ancestral Endogenous Viral Elements. Viruses 2019; 11:v11040320. [PMID: 30986983 PMCID: PMC6520822 DOI: 10.3390/v11040320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/23/2019] [Accepted: 03/27/2019] [Indexed: 12/19/2022] Open
Abstract
It has been believed for a long time that the transfer and fixation of genetic material from RNA viruses to eukaryote genomes is very unlikely. However, during the last decade, there have been several cases in which “virus-to-host” gene transfer from various viral families into various eukaryotic phyla have been described. These transfers have been identified by sequence similarity, which may disappear very quickly, especially in the case of RNA viruses. However, compared to sequences, protein structure is known to be more conserved. Applying protein structure-guided protein domain-specific Hidden Markov Models, we detected homologues of the Virgaviridae capsid protein in Schizophora flies. Further data analysis supported “virus-to-host” transfer into Schizophora ancestors as a single transfer event. This transfer was not identifiable by BLAST or by other methods we applied. Our data show that structure-guided Hidden Markov Models should be used to detect ancestral virus-to-host transfers.
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Affiliation(s)
- Heleri Kirsip
- Department of Bioinformatics, University of Tartu, Tartu, 51010, Riia 23, Estonia.
| | - Aare Abroi
- Institute of Technology, University of Tartu, Tartu, 50411, Nooruse 1, Estonia.
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9
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Mukai Y, Horie M, Tomonaga K. Systematic estimation of insertion dates of endogenous bornavirus-like elements in vesper bats. J Vet Med Sci 2018; 80:1356-1363. [PMID: 29973433 PMCID: PMC6115245 DOI: 10.1292/jvms.18-0211] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Endogenous bornavirus-like elements (EBLs) are sequences derived from bornaviruses (the
family Bornaviridae) that are integrated into animal genomes. They are
formed through germline insertions of segments of bornaviral transcripts into animal
genomes. Because EBLs are molecular fossils of bornaviruses, they serve as precious
sources of information to understand the evolutionary history of bornaviruses. Previous
studies revealed the presence of many EBLs in bat genomes, especially in vesper bats, and
suggested the long-term association between bats and bornaviruses. However, insertion
dates of EBLs are largely unknown because of the limitations of available bat genome
sequences in the public database. In this study, through a combination of database
searches, PCR, and sequencing approaches, we systematically determined the gene
orthologies of 13 lineages of EBLs in bats of the genus Myotis and
Eptesicus and family Vespertilionidae. Using the above data, we
estimated their insertion dates: the EBLs in vesper bats were inserted approximately 14.2
to 53 million years ago. These results suggest that vesper bats have been repeatedly
infected by bornaviruses at different points in time during evolution. This study provides
novel insights into the evolutionary history of bornaviruses and demonstrates the
robustness of combining database searches, PCR, and sequencing approaches to estimate
insertion dates of bornaviruses.
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Affiliation(s)
- Yahiro Mukai
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (InFRONT), Kyoto University, Kyoto 606-8507, Japan.,Department of Mammalian Regulatory Network, Graduate School of Biostudies, Kyoto University, Kyoto 606-8501, Japan
| | - Masayuki Horie
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (InFRONT), Kyoto University, Kyoto 606-8507, Japan.,Hakubi Center for Advanced Research, Kyoto University, Kyoto 606-8501, Japan
| | - Keizo Tomonaga
- Laboratory of RNA Viruses, Department of Virus Research, Institute for Frontier Life and Medical Sciences (InFRONT), Kyoto University, Kyoto 606-8507, Japan.,Department of Mammalian Regulatory Network, Graduate School of Biostudies, Kyoto University, Kyoto 606-8501, Japan.,Department of Molecular Virology, Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan
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10
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Kobayashi Y, Shimazu T, Murata K, Itou T, Suzuki Y. An endogenous adeno-associated virus element in elephants. Virus Res 2018; 262:10-14. [PMID: 29702129 DOI: 10.1016/j.virusres.2018.04.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Revised: 04/17/2018] [Accepted: 04/23/2018] [Indexed: 11/19/2022]
Abstract
An endogenous viral element derived from adeno-associated virus containing a nearly intact open reading frame (ORF) of the rep gene (enAAV-rep) has been identified in the genomes of various mammals including degu and African elephant. Particularly, in degu, mRNA expression of enAAV-rep has been observed specifically in the liver. Here we newly identified enAAV-rep in Asian elephant and rock hyrax, both of which are afrotherians. The enAAV-rep of African and Asian elephants appeared to be orthologous and originated from an integration event of the entire genome of AAV into the ancestral genome of elephants more than 6 million years ago, whereas that of rock hyrax appeared to have originated independently. Negative selection operating at the amino acid sequence level was detected for the ORF of enAAV-rep in elephants. As in degu, mRNA expression of enAAV-rep was specifically observed in the liver in Asian elephant. Integrations of enAAV-rep appeared to have occurred independently on the evolutionary lineages of elephants and degu, suggesting that the AAV Rep protein has been co-opted repeatedly in the mammalian liver.
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Affiliation(s)
- Yuki Kobayashi
- Nihon University Veterinary Research Center, Fujisawa, Kanagawa 252-0880, Japan.
| | - Tsukika Shimazu
- Nihon University Veterinary Research Center, Fujisawa, Kanagawa 252-0880, Japan
| | - Koichi Murata
- Department of Animal Resource Science, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
| | - Takuya Itou
- Nihon University Veterinary Research Center, Fujisawa, Kanagawa 252-0880, Japan
| | - Yoshiyuki Suzuki
- Graduate School of Natural Sciences, Nagoya City University, Nagoya, Aichi 467-8501, Japan
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11
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Horie M, Tomonaga K. Paleovirology of bornaviruses: What can be learned from molecular fossils of bornaviruses. Virus Res 2018; 262:2-9. [PMID: 29630909 DOI: 10.1016/j.virusres.2018.04.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Revised: 04/05/2018] [Accepted: 04/05/2018] [Indexed: 02/05/2023]
Abstract
Endogenous viral elements (EVEs) are virus-derived sequences embedded in eukaryotic genomes formed by germline integration of viral sequences. As many EVEs were integrated into eukaryotic genomes millions of years ago, EVEs are considered molecular fossils of viruses. EVEs can be valuable informational sources about ancient viruses, including their time scale, geographical distribution, genetic information, and hosts. Although integration of viral sequences is not required for replications of viruses other than retroviruses, many non-retroviral EVEs have been reported to exist in eukaryotes. Investigation of these EVEs has expanded our knowledge regarding virus-host interactions, as well as provided information on ancient viruses. Among them, EVEs derived from bornaviruses, non-retroviral RNA viruses, have been relatively well studied. Bornavirus-derived EVEs are widely distributed in animal genomes, including the human genome, and the history of bornaviruses can be dated back to more than 65 million years. Although there are several reports focusing on the biological significance of bornavirus-derived sequences in mammals, paleovirology of bornaviruses has not yet been well described and summarized. In this paper, we describe what can be learned about bornaviruses from endogenous bornavirus-like elements from the view of paleovirology using published results and our novel data.
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Affiliation(s)
- Masayuki Horie
- Hakubi Center for Advanced Research, Kyoto University, Kyoto, Japan; Department of Virus Research, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan.
| | - Keizo Tomonaga
- Department of Virus Research, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto, Japan; Department of Mammalian Regulatory Network, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
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12
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Honda T. Potential Links between Hepadnavirus and Bornavirus Sequences in the Host Genome and Cancer. Front Microbiol 2017; 8:2537. [PMID: 29312227 PMCID: PMC5742130 DOI: 10.3389/fmicb.2017.02537] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 12/06/2017] [Indexed: 12/26/2022] Open
Abstract
Various viruses leave their sequences in the host genomes during infection. Such events occur mainly in retrovirus infection but also sometimes in DNA and non-retroviral RNA virus infections. If viral sequences are integrated into the genomes of germ line cells, the sequences can become inherited as endogenous viral elements (EVEs). The integration events of viral sequences may have oncogenic potential. Because proviral integrations of some retroviruses and/or reactivation of endogenous retroviruses are closely linked to cancers, viral insertions related to non-retroviral viruses also possibly contribute to cancer development. This article focuses on genomic viral sequences derived from two non-retroviral viruses, whose endogenization is already reported, and discusses their possible contributions to cancer. Viral insertions of hepatitis B virus play roles in the development of hepatocellular carcinoma. Endogenous bornavirus-like elements, the only non-retroviral RNA virus-related EVEs found in the human genome, may also be involved in cancer formation. In addition, the possible contribution of the interactions between viruses and retrotransposons, which seem to be a major driving force for generating EVEs related to non-retroviral RNA viruses, to cancers will be discussed. Future studies regarding the possible links described here may open a new avenue for the development of novel therapeutics for tumor virus-related cancers and/or provide novel insights into EVE functions.
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Affiliation(s)
- Tomoyuki Honda
- Division of Virology, Department of Microbiology and Immunology, Osaka University Graduate School of Medicine, Osaka, Japan
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13
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Kondoh T, Manzoor R, Nao N, Maruyama J, Furuyama W, Miyamoto H, Shigeno A, Kuroda M, Matsuno K, Fujikura D, Kajihara M, Yoshida R, Igarashi M, Takada A. Putative endogenous filovirus VP35-like protein potentially functions as an IFN antagonist but not a polymerase cofactor. PLoS One 2017; 12:e0186450. [PMID: 29040311 PMCID: PMC5645129 DOI: 10.1371/journal.pone.0186450] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 10/02/2017] [Indexed: 12/31/2022] Open
Abstract
It has been proposed that some non-retroviral RNA virus genes are integrated into vertebrate genomes. Endogenous filovirus-like elements (EFLs) have been discovered in some mammalian genomes. However, their potential roles in ebolavirus infection are unclear. A filovirus VP35-like element (mlEFL35) is found in the little brown bat (Myotis lucifugus) genome. Putative mlEFL35-derived protein (mlEFL35p) contains nearly full-length amino acid sequences corresponding to ebolavirus VP35. Ebola virus VP35 has been shown to bind double-stranded RNA, leading to inhibition of type I interferon (IFN) production, and is also known as a viral polymerase cofactor that is essential for viral RNA transcription/replication. In this study, we transiently expressed mlEFL35p in human kidney cells and investigated its biological functions. We first found that mlEFL35p was coimmunoprecipitated with itself and ebolavirus VP35s but not with the viral nucleoprotein. Then the biological functions of mlEFL35p were analyzed by comparing it to ebolavirus VP35s. We found that the expression of mlEFL35p significantly inhibited human IFN-β promoter activity as well as VP35s. By contrast, expression of mlEFL35p did not support viral RNA transcription/replication and indeed slightly decrease the reporter gene expression in a minigenome assay. These results suggest that mlEFL35p potentially acts as an IFN antagonist but not a polymerase cofactor.
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Affiliation(s)
- Tatsunari Kondoh
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Rashid Manzoor
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Naganori Nao
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Junki Maruyama
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Wakako Furuyama
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Hiroko Miyamoto
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Asako Shigeno
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Makoto Kuroda
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Keita Matsuno
- Laboratory of Microbiology, Department of Disease Control, Faculty of Veterinary Medicine, Hokkaido University, Sapporo, Japan
- Global Station for Zoonosis Control, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan
| | - Daisuke Fujikura
- Division of Infection and Immunity, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Masahiro Kajihara
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Reiko Yoshida
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
| | - Manabu Igarashi
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
- Global Station for Zoonosis Control, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan
| | - Ayato Takada
- Division of Global Epidemiology, Research Center for Zoonosis Control, Hokkaido University, Sapporo, Japan
- Global Station for Zoonosis Control, Global Institution for Collaborative Research and Education, Hokkaido University, Sapporo, Japan
- School of Veterinary Medicine, the University of Zambia, Lusaka, Zambia
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14
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The biological significance of bornavirus-derived genes in mammals. Curr Opin Virol 2017; 25:1-6. [PMID: 28666136 DOI: 10.1016/j.coviro.2017.06.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 06/06/2017] [Accepted: 06/13/2017] [Indexed: 02/01/2023]
Abstract
The discoveries of sequences derived from non-retroviral viruses in eukaryotic genomes have significantly expanded our knowledge about virus evolution as well as the co-evolution between viruses and eukaryotes. However, the biological functions of such sequences in the host are largely unknown. Endogenous bornavirus-like elements (EBLs) have been relatively well studied by molecular biological methods, which have provided evidence that some EBLs have been co-opted by their hosts. This review highlights the current knowledge on the biological significance of EBLs, and discusses possible functions of EBLs. Further, we highlight the importance of extensive surveillance of exogenous viruses for a better understanding of endogenous viral sequences as well as the co-evolution of viruses and eukaryotes.
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