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Van Bressem MF, Raga JA, Domingo M, Duignan P. Historical isolates of dolphin morbillivirus: origin and new data. DISEASES OF AQUATIC ORGANISMS 2023; 155:159-163. [PMID: 37706646 DOI: 10.3354/dao03752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Dolphin morbillivirus (DMV) was isolated in striped dolphins Stenella coeruleoalba from the Mediterranean Sea stranded along the coast of Spain during a lethal epidemic that killed thousands of individuals in 1990-1992. Though some of these isolates (MUC, 16A and the reference strain) have been extensively characterised, details on their origin were not reported in the literature, and records for these isolates are often difficult to trace and are, sometimes, erroneous. Here, we provide unpublished biological and histopathological data for these isolates, summarize the literature on their characterization and make suggestions for future studies.
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Affiliation(s)
- Marie-Françoise Van Bressem
- Cetacean Conservation Medicine Group, Peruvian Centre for Cetacean Research, Museo de Delfines, Lima 20, Peru
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Zinzula L, Beck F, Klumpe S, Bohn S, Pfeifer G, Bollschweiler D, Nagy I, Plitzko JM, Baumeister W. Cryo-EM structure of the cetacean morbillivirus nucleoprotein-RNA complex. J Struct Biol 2021; 213:107750. [PMID: 34089875 DOI: 10.1016/j.jsb.2021.107750] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/17/2021] [Accepted: 05/31/2021] [Indexed: 11/30/2022]
Abstract
Cetacean morbillivirus (CeMV) is an emerging and highly infectious paramyxovirus that causes outbreaks in cetaceans and occasionally in pinnipeds, representing a major threat to biodiversity and conservation of endangered marine mammal populations in both hemispheres. As for all non-segmented, negative-sense, single-stranded RNA (ssRNA) viruses, the morbilliviral genome is enwrapped by thousands of nucleoprotein (N) protomers. Each bound to six ribonucleotides, N protomers assemble to form a helical ribonucleoprotein (RNP) complex that serves as scaffold for nucleocapsid formation and as template for viral replication and transcription. While the molecular details on RNP complexes elucidated in human measles virus (MeV) served as paradigm model for these processes in all members of the Morbillivirus genus, no structural information has been obtained from other morbilliviruses, nor has any CeMV structure been solved so far. We report the structure of the CeMV RNP complex, reconstituted in vitro upon binding of recombinant CeMV N to poly-adenine ssRNA hexamers and solved to 4.0 Å resolution by cryo-electron microscopy. In spite of the amino acid sequence similarity and consequently similar folding of the N protomer, the CeMV RNP complex exhibits different helical parameters as compared to previously reported MeV orthologs. The CeMV structure reveals exclusive interactions leading to more extensive protomer-RNA and protomer-protomer interfaces. We identified twelve residues, among those varying between CeMV strains, as putatively important for the stabilization of the RNP complex, which highlights the need to study the potential of CeMV N mutations that modulate nucleocapsid assembly to also affect viral phenotype and host adaptation.
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Affiliation(s)
- Luca Zinzula
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany.
| | - Florian Beck
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Sven Klumpe
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Stefan Bohn
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Günter Pfeifer
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Daniel Bollschweiler
- Max-Planck Institute of Biochemistry, Cryo-EM Facility, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - István Nagy
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Jürgen M Plitzko
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany
| | - Wolfgang Baumeister
- Max-Planck Institute of Biochemistry, Department of Molecular Structural Biology, Am Klopferspitz 18, 82152 Martinsried, Germany.
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Ohishi K, Maruyama T, Seki F, Takeda M. Marine Morbilliviruses: Diversity and Interaction with Signaling Lymphocyte Activation Molecules. Viruses 2019; 11:E606. [PMID: 31277275 PMCID: PMC6669707 DOI: 10.3390/v11070606] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 06/27/2019] [Accepted: 06/29/2019] [Indexed: 01/08/2023] Open
Abstract
Epidemiological reports of phocine distemper virus (PDV) and cetacean morbillivirus (CeMV) have accumulated since their discovery nearly 30 years ago. In this review, we focus on the interaction between these marine morbilliviruses and their major cellular receptor, the signaling lymphocyte activation molecule (SLAM). The three-dimensional crystal structure and homology models of SLAMs have demonstrated that 35 residues are important for binding to the morbillivirus hemagglutinin (H) protein and contribute to viral tropism. These 35 residues are essentially conserved among pinnipeds and highly conserved among the Caniformia, suggesting that PDV can infect these animals, but are less conserved among cetaceans. Because CeMV can infect various cetacean species, including toothed and baleen whales, the CeMV-H protein is postulated to have broader specificity to accommodate more divergent SLAM interfaces and may enable the virus to infect seals. In silico analysis of viral H protein and SLAM indicates that each residue of the H protein interacts with multiple residues of SLAM and vice versa. The integration of epidemiological, virological, structural, and computational studies should provide deeper insight into host specificity and switching of marine morbilliviruses.
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Affiliation(s)
- Kazue Ohishi
- Faculty of Engineering, Tokyo Polytechnic University, 1583, Iiyama, Atsugi, Kanagawa 243-0297, Japan.
| | - Tadashi Maruyama
- School of Marine Biosciences, Kitasato University, 1-15-1, Kitazato, Minami, Sagamihara, Kanagawa 252-0373, Japan
| | - Fumio Seki
- Department of Virology III, National Institute of Infectious Diseases, 4-7-1, Gakuen, Musashimurayama, Tokyo 208-0011, Japan
| | - Makoto Takeda
- Department of Virology III, National Institute of Infectious Diseases, 4-7-1, Gakuen, Musashimurayama, Tokyo 208-0011, Japan
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Pfeffermann K, Dörr M, Zirkel F, von Messling V. Morbillivirus Pathogenesis and Virus-Host Interactions. Adv Virus Res 2018; 100:75-98. [PMID: 29551144 DOI: 10.1016/bs.aivir.2017.12.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the availability of safe and effective vaccines against measles and several animal morbilliviruses, they continue to cause regular outbreaks and epidemics in susceptible populations. Morbilliviruses are highly contagious and share a similar pathogenesis in their respective hosts. This review provides an overview of morbillivirus history and the general replication cycle and recapitulates Morbillivirus pathogenesis focusing on common and unique aspects seen in different hosts. It also summarizes the state of knowledge regarding virus-host interactions on the cellular level with an emphasis on viral interference with innate immune response activation, and highlights remaining knowledge gaps.
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Jacob JM, West KL, Levine G, Sanchez S, Jensen BA. Initial characterization of novel beaked whale morbillivirus in Hawaiian cetaceans. DISEASES OF AQUATIC ORGANISMS 2016; 117:215-227. [PMID: 26758655 DOI: 10.3354/dao02941] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cetacean morbillivirus (CeMV) is a causative factor in epizootics that have resulted in thousands of deaths throughout the Atlantic and Mediterranean since 1987, but less is known of its presence and significance in the Pacific. The first case of CeMV reported in Hawai'i was in a Longman's beaked whale that stranded in 2010. The initial CeMV sequence from this individual indicated the possibility of a novel strain. To address this, archived samples from cetaceans that stranded in Hawai'i between 1997 and 2014 were screened for CeMV. The beaked whale morbillivirus (BWMV) was detected in 15 individuals representing 12 different species (24% of Code 1 and 2 stranded cetaceans). The earliest detected case was a humpback whale that stranded in 1998. Sequence comparisons of a 2.2 kb sequence spanning the phosphoprotein (P) and nucleocapsid (N) genes strongly suggest that the BWMV represents a novel strain of CeMV present in Hawai'i and the Central Pacific. In contrast to recently reported isolates from Brazil and Australia that may represent a distinct clade, BWMV appears to be more closely related to known strains of CeMV (dolphin morbillivirus; porpoise morbillivirus; and pilot whale morbillivirus). Detection rates with repeat sampling of positive lymph nodes were between 2 and 61%, illustrating the extreme heterogeneity that can occur in affected tissues. Taken together, these results suggest that BWMV may be common and established in Hawaiian cetacean populations. BWMV will be important for understanding CeMV and health threats in the relatively understudied cetaceans of the Pacific.
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Affiliation(s)
- Jessica M Jacob
- College of Natural and Computational Sciences, Hawai'i Pacific University, 45-045 Kamehameha Highway, Kaneohe, Hawai'i 96744, USA
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Van Bressem MF, Duignan PJ, Banyard A, Barbieri M, Colegrove KM, De Guise S, Di Guardo G, Dobson A, Domingo M, Fauquier D, Fernandez A, Goldstein T, Grenfell B, Groch KR, Gulland F, Jensen BA, Jepson PD, Hall A, Kuiken T, Mazzariol S, Morris SE, Nielsen O, Raga JA, Rowles TK, Saliki J, Sierra E, Stephens N, Stone B, Tomo I, Wang J, Waltzek T, Wellehan JFX. Cetacean morbillivirus: current knowledge and future directions. Viruses 2014; 6:5145-81. [PMID: 25533660 PMCID: PMC4276946 DOI: 10.3390/v6125145] [Citation(s) in RCA: 155] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Revised: 12/02/2014] [Accepted: 12/16/2014] [Indexed: 12/19/2022] Open
Abstract
We review the molecular and epidemiological characteristics of cetacean morbillivirus (CeMV) and the diagnosis and pathogenesis of associated disease, with six different strains detected in cetaceans worldwide. CeMV has caused epidemics with high mortality in odontocetes in Europe, the USA and Australia. It represents a distinct species within the Morbillivirus genus. Although most CeMV strains are phylogenetically closely related, recent data indicate that morbilliviruses recovered from Indo-Pacific bottlenose dolphins (Tursiops aduncus), from Western Australia, and a Guiana dolphin (Sotalia guianensis), from Brazil, are divergent. The signaling lymphocyte activation molecule (SLAM) cell receptor for CeMV has been characterized in cetaceans. It shares higher amino acid identity with the ruminant SLAM than with the receptors of carnivores or humans, reflecting the evolutionary history of these mammalian taxa. In Delphinidae, three amino acid substitutions may result in a higher affinity for the virus. Infection is diagnosed by histology, immunohistochemistry, virus isolation, RT-PCR, and serology. Classical CeMV-associated lesions include bronchointerstitial pneumonia, encephalitis, syncytia, and lymphoid depletion associated with immunosuppression. Cetaceans that survive the acute disease may develop fatal secondary infections and chronic encephalitis. Endemically infected, gregarious odontocetes probably serve as reservoirs and vectors. Transmission likely occurs through the inhalation of aerosolized virus but mother to fetus transmission was also reported.
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Affiliation(s)
- Marie-Françoise Van Bressem
- Cetacean Conservation Medicine Group (CMED), Peruvian Centre for Cetacean Research (CEPEC), Pucusana, Lima 20, Peru
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +49-30-53051397
| | - Pádraig J. Duignan
- Department of Ecosystem and Public Health, University of Calgary, Calgary, AL T2N 4Z6, Canada; E-Mail:
| | - Ashley Banyard
- Wildlife Zoonoses and Vector Borne Disease Research Group, Animal and Plant Health Agency (APHA), Weybridge, Surrey KT15 3NB, UK; E-Mail:
| | - Michelle Barbieri
- The Marine Mammal Centre, Sausalito, CA 94965, USA; E-Mails: (M.B.); (F.G.)
| | - Kathleen M Colegrove
- Zoological Pathology Program, College of Veterinary Medicine, University of Illinois at Maywood, IL 60153 , USA; E-Mail:
| | - Sylvain De Guise
- Department of Pathobiology and Veterinary Science, and Connecticut Sea Grant College Program, University of Connecticut, Storrs, CT 06269, USA; E-Mail:
| | - Giovanni Di Guardo
- Faculty of Veterinary Medicine, University of Teramo, 64100 Teramo, Italy; E-Mail:
| | - Andrew Dobson
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA; E-Mails: (A.D.); (B.G.); (S.E.M.)
| | - Mariano Domingo
- Centre de Recerca en Sanitat Animal (CReSA), Autonomous University of Barcelona, Bellaterra, Barcelona 08193, Spain; E-Mail:
| | - Deborah Fauquier
- National Marine Fisheries Service, Marine Mammal Health and Stranding Response Program, Silver Spring, MD 20910, USA; E-Mails: (D.F.); (T.K.R.)
| | - Antonio Fernandez
- Department of Veterinary Pathology, Institute of Animal Health, Veterinary School, Universidad de Las Palmas de Gran Canaria, Las Palmas 35413, Spain; E-Mails: (A.F.); (E.S.)
| | - Tracey Goldstein
- One Health Institute School of Veterinary Medicine University of California, Davis, CA 95616, USA; E-Mail:
| | - Bryan Grenfell
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA; E-Mails: (A.D.); (B.G.); (S.E.M.)
- Fogarty International Center, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kátia R. Groch
- Department of Pathology, School of Veterinary Medicine and Animal Sciences, University of São Paulo, São Paulo 05508-207, Brazil; E-Mail:
- Instituto Baleia Jubarte (Humpback Whale Institute), Caravelas, Bahia 45900-000, Brazil
| | - Frances Gulland
- The Marine Mammal Centre, Sausalito, CA 94965, USA; E-Mails: (M.B.); (F.G.)
- Marine Mammal Commission, 4340 East-West Highway, Bethesda, MD 20814, USA
| | - Brenda A Jensen
- Department of Natural Sciences, Hawai`i Pacific University, Kaneohe, HI 96744, USA; E-Mail:
| | - Paul D Jepson
- Institute of Zoology, Regent’s Park, London NW1 4RY, UK; E-Mail:
| | - Ailsa Hall
- Sea Mammal Research Unit, Scottish Oceans Institute, University of St. Andrews, St. Andrews KY16 8LB, UK; E-Mail:
| | - Thijs Kuiken
- Department of Viroscience, Erasmus MC, Rotterdam 3015 CN, The Netherlands; E-Mail:
| | - Sandro Mazzariol
- Department of Comparative Biomedicine and Food Science, University of Padua, Padua 35020, Italy; E-Mail:
| | - Sinead E Morris
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, USA; E-Mails: (A.D.); (B.G.); (S.E.M.)
| | - Ole Nielsen
- Department of Fisheries and Oceans Canada, Central and Arctic Region, 501 University Crescent, Winnipeg, MB R3T 2N6 , Canada; E-Mail:
| | - Juan A Raga
- Marine Zoology Unit, Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Valencia 22085, Spain; E-Mail:
| | - Teresa K Rowles
- National Marine Fisheries Service, Marine Mammal Health and Stranding Response Program, Silver Spring, MD 20910, USA; E-Mails: (D.F.); (T.K.R.)
| | - Jeremy Saliki
- Athens Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA GA 30602 , USA; E-Mail:
| | - Eva Sierra
- Department of Veterinary Pathology, Institute of Animal Health, Veterinary School, Universidad de Las Palmas de Gran Canaria, Las Palmas 35413, Spain; E-Mails: (A.F.); (E.S.)
| | - Nahiid Stephens
- School of Veterinary and Life Sciences, Murdoch University, Perth 6150, Western Australia, Australia; E-Mail:
| | - Brett Stone
- QML Vetnostics, Metroplex on Gateway, Murarrie, Queensland 4172, Australia; E-Mail:
| | - Ikuko Tomo
- South Australian Museum, North Terrace, Adelaide 5000, South Australia, Australia; E-Mail:
| | - Jianning Wang
- Commonwealth Scientific and Industrial Research Organisation (CSIRO), East Geelong, Victoria 3220, Australia; E-Mail:
| | - Thomas Waltzek
- Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA; E-Mail:
| | - James FX Wellehan
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA; E-Mail:
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Bossart GD, Romano TA, Peden-Adams MM, Schaefer A, McCulloch S, Goldstein JD, Rice CD, Saliki JT, Fair PA, Reif JS. Clinicoimmunopathologic findings in Atlantic bottlenose dolphins Tursiops truncatus with positive cetacean morbillivirus antibody titers. DISEASES OF AQUATIC ORGANISMS 2011; 97:103-112. [PMID: 22303627 DOI: 10.3354/dao02410] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Sera from free-ranging Atlantic bottlenose dolphins Tursiops truncatus inhabiting the Indian River Lagoon (IRL), Florida were tested for antibodies to cetacean morbilliviruses from 2003 to 2007 as part of a multidisciplinary study of individual and population health. A suite of clinicoimmunopathologic variables were evaluated in morbillivirus-seropositive dolphins (n = 14) and seronegative healthy dolphins (n = 49). Several important differences were found. Serum alkaline phosphatase, creatine phosphokinase, chloride, albumin and albumin/globulin ratios were significantly lower in seropositive dolphins. Innate immunity appeared to be upregulated with significant increases in lysozyme concentration and marginally significant increases in monocytic phagocytosis. Adaptive immunity was also impacted in dolphins with positive morbillivirus antibody titers. Mitogen-induced T lymphocyte proliferation responses were significantly reduced in dolphins with positive morbillivirus antibody titers, and marginally significant decreases were found for absolute numbers of CD4+ lymphocytes. The findings suggest impairment of cell-mediated adaptive immunity, similar to the immunologic pattern reported with acute morbillivirus infection in other species. In contrast, dolphins with positive morbillivirus antibody titers appeared to have at least a partially upregulated humoral immune response with significantly higher levels of gamma globulins than healthy dolphins, which may represent an antibody response to morbillivirus infection or other pathogens. These data suggest that subclinical dolphin morbillivirus infection in IRL dolphins may produce clinicoimmunopathologic perturbations that impact overall health.
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Bellière EN, Esperón F, Sánchez-Vizcaíno JM. Genetic comparison among dolphin morbillivirus in the 1990–1992 and 2006–2008 Mediterranean outbreaks. INFECTION GENETICS AND EVOLUTION 2011; 11:1913-20. [DOI: 10.1016/j.meegid.2011.08.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 08/09/2011] [Accepted: 08/16/2011] [Indexed: 10/17/2022]
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Morbillivirus infection in pilot whales: strict protein requirement drives genetic conservation. Arch Virol 2011; 156:1853-9. [DOI: 10.1007/s00705-011-1042-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2011] [Accepted: 05/26/2011] [Indexed: 10/18/2022]
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Abstract
The long-term consequences of climate change and potential environmental degradation are likely to include aspects of disease emergence in marine plants and animals. In turn, these emerging diseases may have epizootic potential, zoonotic implications, and a complex pathogenesis involving other cofactors such as anthropogenic contaminant burden, genetics, and immunologic dysfunction. The concept of marine sentinel organisms provides one approach to evaluating aquatic ecosystem health. Such sentinels are barometers for current or potential negative impacts on individual- and population-level animal health. In turn, using marine sentinels permits better characterization and management of impacts that ultimately affect animal and human health associated with the oceans. Marine mammals are prime sentinel species because many species have long life spans, are long-term coastal residents, feed at a high trophic level, and have unique fat stores that can serve as depots for anthropogenic toxins. Marine mammals may be exposed to environmental stressors such as chemical pollutants, harmful algal biotoxins, and emerging or resurging pathogens. Since many marine mammal species share the coastal environment with humans and consume the same food, they also may serve as effective sentinels for public health problems. Finally, marine mammals are charismatic megafauna that typically stimulate an exaggerated human behavioral response and are thus more likely to be observed.
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Smith KF, Guégan JF. Changing Geographic Distributions of Human Pathogens. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2010. [DOI: 10.1146/annurev-ecolsys-102209-144634] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Since the rise of modern humans, changes in demography and land use and frequent contact with wildlife and domesticated animals have created ongoing opportunities for pathogen loss, gain, and evolution in the human population. Early transportation networks and population expansion created a world where many human-specific pathogens are now ubiquitous, yet zoonoses continue to emerge as humans encroach into the last remaining wild areas, increase livestock production, and plug into vast global trade networks. Pathogens are exploiting almost any change in human ecology that provides new opportunities for transmission, the most recent being rampant use of antibiotics resulting in new multidrug-resistant pathogens. Public health advances have benefitted some nations, but others continue to suffer from pathogens long eradicated by developed nations. Generalities of pathogen occurrence aid in disease prediction, but a systemic approach incorporating ecology, biogeography, public health, and conservation biology is ultimately necessary to fully comprehend the changing geographic distributions of human pathogens.
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Affiliation(s)
- Katherine F. Smith
- Department of Ecology and Evolutionary Biology, Brown University, Providence, Rhode Island 02912
| | - Jean-François Guégan
- Centre IRD de Montpellier, UMR 2724 IRD-CNRS-University of Montpellier Sud-de-France, Montpellier 34095, France
- Interdisciplinary Center on Globalization and Infectious Diseases, French School of Public Health, Centre IRD de Montpellier, Montpellier, France
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Bossart GD, Reif JS, Schaefer AM, Goldstein J, Fair PA, Saliki JT. Morbillivirus infection in free-ranging Atlantic bottlenose dolphins (Tursiops truncatus) from the Southeastern United States: seroepidemiologic and pathologic evidence of subclinical infection. Vet Microbiol 2009; 143:160-6. [PMID: 20005646 DOI: 10.1016/j.vetmic.2009.11.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 11/06/2009] [Accepted: 11/16/2009] [Indexed: 11/30/2022]
Abstract
From 2003 to 2007, sera (n=234) from free-ranging Atlantic bottlenose dolphins (Tursiops truncatus) inhabiting two southeast Atlantic estuarine regions, the Indian River Lagoon (IRL), FL and Charleston, SC (CHS) were tested for antibodies to cetacean morbilliviruses as part of a multidisciplinary study of individual and population health. Positive morbillivirus titers were found on initial capture in 12 of 122 (9.8%) IRL dolphins in the absence of an epizootic. All CHS dolphins were seronegative. Positive fluctuating morbillivirus titers and seroconversion were found in IRL dolphins. Seropositivity was detected in dolphins 8-13 years of age as well as in dolphins that were alive during the 1987-1988 epizootic. During the study period, pathologic and immunohistochemical findings from stranded IRL dolphins (n=14) did not demonstrate typical morbillivirus-associated lesions or the presence of morbillivirus antigen. The findings suggest that morbillivirus infections are occurring in the absence of widespread mortality in IRL dolphins.
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Grant RJ, Banyard AC, Barrett T, Saliki JT, Romero CH. Real-time RT-PCR assays for the rapid and differential detection of dolphin and porpoise morbilliviruses. J Virol Methods 2008; 156:117-23. [PMID: 19084557 DOI: 10.1016/j.jviromet.2008.11.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2008] [Revised: 11/02/2008] [Accepted: 11/04/2008] [Indexed: 10/21/2022]
Abstract
Real-time RT-PCR (rtRT-PCR) assays for identifying and differentiating infections caused by dolphin morbillivirus (DMV) and porpoise morbillivirus (PMV) were developed by targeting the hypervariable C-terminal domain of the nucleocapsid (N) gene. Total DMV and PMV RNA extracted from infected Vero cells expressing the canine signaling lymphocyte-activation molecule (SLAM) produced positive cycle threshold (C(T)) values after the 17th and 25th cycles, respectively. The assays were then validated using infected cetacean tissue RNA. The assays were specific for either DMV or PMV and did not cross-react with canine distemper virus (CDV), phocid distemper virus (PDV), rinderpest virus (RPV), peste des petits ruminants virus (PPRV) and measles virus (MV). The glyceraldehyde 3-phosphate dehydrogenase (GAPDH) gene was targeted as control for RNA quality, and a consensus GAPDH probe that reacted with 11 different marine mammal species, generating positive C(T) values ranging from the 21st to the 37th cycle was used. The rtRT-PCR assays have advantages over conventional assays in that they are rapid, easier to scale up, and are less prone to cross-contamination and have improved the limit of detection and specificity.
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Affiliation(s)
- Rebecca J Grant
- Department of Infectious Diseases and Pathology, College of Veterinary Medicine, University of Florida, Gainesville, FL 32610, USA
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Banyard AC, Grant RJ, Romero CH, Barrett T. Sequence of the nucleocapsid gene and genome and antigenome promoters for an isolate of porpoise morbillivirus. Virus Res 2007; 132:213-9. [PMID: 18166241 DOI: 10.1016/j.virusres.2007.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Revised: 11/05/2007] [Accepted: 11/10/2007] [Indexed: 10/22/2022]
Abstract
We have determined the first complete sequence of the nucleocapsid (N) gene of the porpoise morbillivirus (PMV) as well as the genome leader and trailer sequences which encode the genome and antigenome promoters, respectively. The PMV N gene is 1686 nucleotides long with a single open reading frame (ORF) encoding a protein of 523 amino acids with a predicted molecular weight of 57.39kDa. The nucleotide sequence of the N gene shows the closest identity (89%) to that of another cetacean morbillivirus, dolphin morbillivirus (DMV). Lower degrees of identity were found with the other members of the morbilliviruses genus; 67% identity to PDV and RPV, 68% to PPRV, 69% to CDV and 70% to MV. The distance from the 3' end of the genome up to the start of the N ORF is 107 nucleotides, identical to that found in all other morbilliviruses, and encompasses the genome promoter (GP) sequence. This promoter shows the same regions of conservation as found in other morbilliviruses with repeated CXXXXX motifs at positions 79-84, 85-90, and 91-96, the same bi-partite promoter arrangement found in many paramyxoviruses. The antigenome promoter (AGP) shows a similar arrangement, indicating a high degree of conservation in these functionally important regions.
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Muthuchelvan D, Sanyal A, Balamurugan V, Dhar P, Bandyopadhyay SK. Sequence analysis of the nucleoprotein gene of Asian lineage peste des petits ruminants vaccine virus. Vet Res Commun 2007; 30:957-63. [PMID: 17139548 DOI: 10.1007/s11259-006-3407-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/01/2005] [Indexed: 10/23/2022]
Abstract
The complete nucleotide sequence of the nucleocapsid (N) protein of the peste-des-petits ruminants vaccine virus (PPRV Sungri/96) belonging to the Asian lineage was determined. The gene was 1692 nucleotides in length and encoded a polypeptide of 525 amino acids. The PPRV Sungri/96 N gene has a nucleotide homology of 92% for PPRV Nigeria 75/1 to 55.5% for canine distemper virus. At amino acid level the homology was 94.1% with PPRV Nigeria 75/1, while with other morbilliviruses, PPRV Sungri/96 had only 71.4-64.9% amino acid identity. The phosphorylation prediction reveals eight conserved sites across morbilliviruses, whereas in the C-terminal portion of the protein the sites are not conserved. Phylogenetic analysis of different N proteins of morbilliviruses revealed five well-defined clusters as observed previously. To the best of our knowledge this is the first report describing the nucleocapsid gene sequence of PPRV Indian isolate.
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Affiliation(s)
- D Muthuchelvan
- Central Institute of Fisheries Technology, Cochin, India
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16
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Sips GJ, Chesik D, Glazenburg L, Wilschut J, De Keyser J, Wilczak N. Involvement of morbilliviruses in the pathogenesis of demyelinating disease. Rev Med Virol 2007; 17:223-44. [PMID: 17410634 DOI: 10.1002/rmv.526] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Two members of the morbillivirus genus of the family Paramyxoviridae, canine distemper virus (CDV) and measles virus (MV), are well-known for their ability to cause a chronic demyelinating disease of the CNS in their natural hosts, dogs and humans, respectively. Both viruses have been studied for their potential involvement in the neuropathogenesis of the human demyelinating disease multiple sclerosis (MS). Recently, three new members of the morbillivirus genus, phocine distemper virus (PDV), porpoise morbillivirus (PMV) and dolphin morbillivirus (DMV), have been discovered. These viruses have also been shown to induce multifocal demyelinating disease in infected animals. This review focuses on morbillivirus-induced neuropathologies with emphasis on aetiopathogenesis of CNS demyelination. The possible involvement of a morbillivirus in the pathogenesis of multiple sclerosis is discussed.
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Affiliation(s)
- G J Sips
- Department of Neurology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
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17
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Rima BK, Collin AMJ, Earle JAP. Completion of the sequence of a cetacean morbillivirus and comparative analysis of the complete genome sequences of four morbilliviruses. Virus Genes 2005; 30:113-9. [PMID: 15744569 DOI: 10.1007/s11262-004-4588-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2003] [Accepted: 08/02/2004] [Indexed: 10/25/2022]
Abstract
The gene encoding the large (L) protein and the genome termini of the dolphin strain of cetacean morbillivirus (CeMV) were sequenced. The CeMV genome is 15702 nucleotides long and has been compared with other available morbillivirus genome sequences in regards to the "rule of six" and the "phase" of any particular nucleotide, defined as its position within a given hexamer, which here is defined as a group of six nucleotides starting from the 3' end of the genomic RNA. With exception of the position of the start of the F gene, the phase of the transcription start sites of each gene is strictly conserved between the morbilliviruses, but each gene is in a different phase. The lengths of gene transcripts differ between viruses by multiples of six nucleotides with exception of the M and F transcripts. The differences between the various morbilliviruses result from deletions or insertions of multiples of six nucleotides in the 3' and 5' UTRs of the different viral genes. The four bases were distributed non-randomly over the six positions in the hexamer boxes. However, the distribution patterns of each of the four bases indicated that multiples of three were more prevalent than those of six nucleotides. This reflected the positions of nucleotides in codons and codon usage in the reading frames. The L protein of CeMV was found to be 2183 amino acids in length and similar to that of MV and RPV. The CeMV L protein sequence was found to be equidistant between those of the CDV/PDV and MV/RPV subgroups of the morbilliviruses. This concurs with the analyses carried out on the other structural proteins.
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Affiliation(s)
- B K Rima
- School of Biology and Biochemistry, The Queen's University of Belfast, Belfast BT9 7BL, N. Ireland.
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18
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Di Guardo G, Marruchella G, Agrimi U, Kennedy S. Morbillivirus infections in aquatic mammals: a brief overview. ACTA ACUST UNITED AC 2005; 52:88-93. [PMID: 15737178 DOI: 10.1111/j.1439-0442.2005.00693.x] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Since 1987, at least eight morbillivirus infection (MI) epidemics have caused mass mortality of several free-living pinniped and cetacean populations around the world. The responsible agents, all belonging to the genus Morbillivirus (family Paramyxoviridae), have been characterized as either "canine distemper virus" strains, infecting pinnipeds, or as three new morbilliviruses, namely "phocid (phocine) distemper virus" , "porpoise morbillivirus" and "dolphin morbillivirus" . The last two agents are currently gathered under the common denomination of "cetacean morbillivirus". At post-mortem examination, a commonly occurring macroscopic lesion is represented by more or less severe bilateral pneumonia, with consolidation, congestion and oedema of both lungs, which fail to collapse. Histologically, a non-suppurative broncho-interstitial pneumonia, characterized by type II pneumocyte hyperplasia and by formation of endobronchial, endobronchiolar and endoalveolar "Warthin-Finkeldey type" syncytia, as well as a multifocal, non-suppurative encephalitis, associated with a severe and generalized lymphoid tissue depletion, are common pathological findings. Furthermore, eosinophilic viral inclusions are often detected, at both the intracytoplasmic and intranuclear level, within bronchial and bronchiolar epithelial, pulmonary syncytial, neuronal and other cell types. These inclusions, along with lymphoid and other cellular elements, are often found to be immunohistochemically positive for morbillivirus antigen. Among the still debated, or even controversial issues regarding MI in sea mammals, the one related to the origin of their causative agents is of particular concern. Another intriguing issue regards the synergistic effects, if any, associated with chronic exposure to a number of environmental pollutants, such as organochlorines and heavy metals. In fact, it is also unknown whether and how these chemicals contribute towards modulating the pathogenic and pathogenetic activity primarily displayed by sea mammal morbilliviruses.
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Affiliation(s)
- G Di Guardo
- Department of Comparative Biomedical Sciences, Faculty of Veterinary Medicine, University of Teramo, Piazza Aldo Moro 45, 64100 Teramo, Italy.
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19
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Kingston RL, Baase WA, Gay LS. Characterization of nucleocapsid binding by the measles virus and mumps virus phosphoproteins. J Virol 2004; 78:8630-40. [PMID: 15280472 PMCID: PMC479056 DOI: 10.1128/jvi.78.16.8630-8640.2004] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We report an analysis of the interaction between the P protein and the RNA-associated N protein (N-RNA) for both measles and mumps viruses with proteins produced in a bacterial expression system. During this study, we verified that the C-terminal tail of the N protein is not required for nucleocapsid formation. For both measles and mumps virus N, truncated proteins encompassing amino acids 1 to 375 assemble into nucleocapsid-like particles within the bacterial cell. For measles virus N, the binding site for the P protein maps to residues 477 to 505 within the tail of the molecule, a sequence relatively conserved among the morbilliviruses. For mumps virus N, a binding site for the P protein maps to the assembly domain of N (residues 1 to 398), while no strong binding of the P protein to the tail of N was detected. These results suggest that the site of attachment for the polymerase varies among the paramyxoviruses. Pulldown experiments demonstrate that the last 50 amino acids of both measles virus and mumps virus P (measles virus P, 457 to 507; mumps virus P, 343 to 391) by themselves constitute the nucleocapsid-binding domain (NBD). Spectroscopic studies show that the NBD is predominantly alpha-helical in both viruses. However, only in measles virus P is the NBD stable and folded, having a lesser degree of tertiary organization in mumps virus P. With isothermal titration calorimetry, we demonstrate that the measles virus P NBD binds to residues 477 to 505 of measles virus N with 1:1 stoichiometry. The dissociation constant (K(d)) was determined to be 13 microM at 20 degrees C and 35 microM at 37 degrees C. Our data are consistent with a model in which an alpha-helical nucleocapsid binding domain, located at the C terminus of P, is responsible for tethering the viral polymerase to its template yet also suggest that, in detail, polymerase binding in morbilliviruses and rubulaviruses differs significantly.
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Affiliation(s)
- Richard L Kingston
- Howard Hughes Medical Institute, Institute of Molecular Biology, University of Oregon, Eugene, OR 97403, USA.
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20
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Nielsen L, Andersen MK, Jensen TD, Blixenkrone-Møller M, Bolt G. Changes in the receptorbinding haemagglutinin protein of wild-type morbilliviruses are not required for adaptation to Vero cells. Virus Genes 2003; 27:157-62. [PMID: 14501193 DOI: 10.1023/a:1025724526378] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We examined the consequences of isolation and adaptation to Vero cells for the receptorbinding haemagglutinin (H) gene of four syncytia-forming isolates of canine distemper virus (CDV) and of a dolphin morbillivirus isolate. A Vero-adapted CDV isolate exhibited biased hypermutation, since 11 out of 12 nucleotide differences to other isolates from the same epidemic were U-C transitions. Most of these transitions appeared to have taken place during in vitro cultivation. Previously, biased hypermutation in morbilliviruses has almost exclusively been described for subacute sclerosing panencephalitis and measles inclusion body encephalitis, which are rare measles virus brain infections. Amino acid changes in the H proteins were not required for Vero cell adaptation, suggesting that Vero cells express receptors for wild-type morbilliviruses. This strongly indicate the existence of other morbillivirus receptors than CD46 and CDw150.
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MESH Headings
- Adaptation, Biological
- Animals
- Antigens, CD
- Chlorocebus aethiops
- Distemper Virus, Canine/genetics
- Distemper Virus, Canine/growth & development
- Glycoproteins
- Hemagglutinins, Viral/chemistry
- Hemagglutinins, Viral/genetics
- Immunoglobulins
- Measles virus/genetics
- Measles virus/growth & development
- Membrane Cofactor Protein
- Membrane Glycoproteins
- Molecular Sequence Data
- Morbillivirus/genetics
- Morbillivirus/growth & development
- Mutation, Missense
- Point Mutation/genetics
- RNA, Viral/genetics
- RNA, Viral/isolation & purification
- Receptors, Cell Surface
- Reverse Transcriptase Polymerase Chain Reaction
- Signaling Lymphocytic Activation Molecule Family Member 1
- Vero Cells
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Affiliation(s)
- Line Nielsen
- Laboratory of Virology and Immunology, Royal Veterinary and Agricultural University, Copenhagen, Denmark
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21
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Abstract
The study of viral molecular genetics has produced a considerable body of research into the sequences and phylogenetic relationships of human and animal viruses. A review of this literature suggests that humans have been afflicted by viruses throughout their evolutionary history, although the number and types have changed. Some viruses show evidence of long-standing intimate relationship and cospeciation with hominids, while others are more recently acquired from other species, including African monkeys and apes while our line was evolving in that continent, and domesticated animals and rodents since the Neolithic. Viral selection for specific resistance polymorphisms is unlikely, but in conjunction with other parasites, viruses have probably contributed to selection pressure maintaining major histocompatibility complex (MHC) diversity and a strong immune response. They may also have played a role in the loss in our lineage of N-glycolylneuraminic acid (Neu5Gc), a cell-surface receptor for many infectious agents. Shared viruses could have affected hominid species diversity both by promoting divergence and by weeding out less resistant host populations, while viruses carried by humans and other animals migrating out of Africa may have contributed to declines in other populations. Endogenous retroviral insertions since the divergence between humans and chimpanzees were capable of directly affecting hominid evolution through changes in gene expression and development.
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22
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Saliki JT, Cooper EJ, Gustavson JP. Emerging morbillivirus infections of marine mammals: development of two diagnostic approaches. Ann N Y Acad Sci 2002; 969:51-9. [PMID: 12381563 DOI: 10.1111/j.1749-6632.2002.tb04350.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In the last 13 years, four viruses belonging in the Morbillivirus genus of the Paramyxoviridae family have emerged as significant causes of disease and mortality in marine mammals. The viruses involved are canine distemper virus (CDV) in seals and polar bears, dolphin morbillivirus (DMV) and porpoise morbillivirus (PMV) in cetaceans, and phocine distemper virus (PDV) in pinnipeds. The two cetacean morbilliviruses (DMV and PMV) are now considered to be the same viral species, named cetacean morbillivirus (CMV). All three morbillivirus species (CDV, CMV, and PDV) are genetically and antigenically related and cross-react in various serological tests. The diagnosis of morbilliviral infections in marine mammal specimens poses two challenges. First, various marine mammal species can be infected by more than one closely related but distinct morbilliviruses, making definitive virus identification unattainable by classical virology methods. Second, standard immunological reagents such as anti-species conjugates are unavailable for most marine mammal species, rendering definitive serological diagnosis difficult by classical serological techniques. The objectives of this study were to develop two diagnostic approaches that alleviate these difficulties, providing simple, rapid, and cost-effective diagnostic methods. For nucleic acid detection, reverse transcription-polymerase chain reaction (RT-PCR) and restriction endonuclease digestions were used to differentiate the three viruses. For antibody detection, a monoclonal antibody-based competitive enzyme-linked immunosorbent assay (c-ELISA) was used on sera from several species, thus avoiding the need for multiple anti-species enzyme conjugates.
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Affiliation(s)
- Jeremiah T Saliki
- Oklahoma Animal Disease Diagnostic Laboratory, College of Veterinary Medicine, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
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23
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Van Bressem M, Waerebeek KV, Jepson PD, Raga JA, Duignan PJ, Nielsen O, Di Beneditto AP, Siciliano S, Ramos R, Kant W, Peddemors V, Kinoshita R, Ross PS, López-Fernandez A, Evans K, Crespo E, Barrett T. An insight into the epidemiology of dolphin morbillivirus worldwide. Vet Microbiol 2001; 81:287-304. [PMID: 11390111 DOI: 10.1016/s0378-1135(01)00368-6] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Serum samples from 288 cetaceans representing 25 species and originating from 11 different countries were collected between 1995 and 1999 and examined for the presence of dolphin morbillivirus (DMV)-specific antibodies by an indirect ELISA (iELISA) (N = 267) or a plaque reduction assay (N = 21). A total of 35 odontocetes were seropositive: three harbour porpoises (Phocoena phocoena) and a common dolphin (Delphinus delphis) from the Northeastern (NE) Atlantic, a bottlenose dolphin (Tursiops truncatus) from Kent (England), three striped dolphins (Stenella coeruleoalba), two Risso's dolphins (Grampus griseus) and a bottlenose dolphin from the Mediterranean Sea, one common dolphin from the Southwest (SW) Indian Ocean, three Fraser's dolphins (Lagenodelphis hosei) from the SW Atlantic, 18 long-finned pilot whales (Globicephala melas) and a bottlenose dolphin from the SW Pacific as well as a captive bottlenose dolphin (Tursiops aduncus) originally from Taiwan. The presence of morbillivirus antibodies in 17 of these animals was further examined in other iELISAs and virus neutralization tests. Our results indicate that DMV infects cetaceans worldwide. This is the first report of DMV-seropositive animals from the SW Indian, SW Atlantic and West Pacific Oceans. Prevalence of DMV-seropositives was 85.7% in 21 pilot whales from the SW Pacific and both sexually mature and immature individuals were infected. This indicates that DMV is endemic in these animals. The same situation may occur among Fraser's dolphins from the SW Atlantic. The prevalence of DMV-seropositives was 5.26% and 5.36% in 19 common dolphins and 56 harbour porpoise from the NE Atlantic, respectively, and 18.75% in 16 striped dolphins from the Mediterranean. Prevalence varied significantly with sexual maturity in harbour porpoises and striped dolphins; all DMV-seropositives being mature animals. The prevalence of seropositive harbour porpoise and striped dolphins appeared to have decreased since previous studies. These data suggest that DMV is not endemic within these populations, that they are losing their humoral immunity against the virus and that they may be vulnerable to new epidemics.
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Affiliation(s)
- M Van Bressem
- Peruvian Centre for Cetacean Research (CEPEC), Jorge Chávez 302, Pucusana, 20, Lima, Peru.
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24
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Abstract
Morbillivirus infections which were not documented in aquatic mammals until 1988, have caused at least five epizootics in these species during the last 10 years. Affected populations include European harbour seals (Phoca vitulina) and grey seals (Halichoerus grypus) in 1998, Baikal seals (Phoca siberica) in Siberia from 1987-1988, striped dolphins (Stenella coeruleoalba) in the Mediterranean Sea from 1990-1992 and bottlenose dolphins (Tursiops truncatus) along the eastern coast of the United States from 1987-1988 and in the Gulf of Mexico from 1993-1994. Clinical signs and lesions in affected animals were similar to those of canine distemper. Lesions were mainly seen in lung, central nervous and lymphoid tissues and included formation of intranuclear and intracytoplasmic inclusion bodies. Syncytia were commonly found in lung and lymphoid tissues of cetaceans but not of pinnipeds. Antigenic and molecular biological studies indicate that a newly discovered morbillivirus, termed phocine distemper virus, and canine distemper virus were responsible for recent pinniped epizootics; cetacean die-offs were caused by strains of a second, newly recognized cetacean morbillivirus. Serological evidence of morbillivirus infection has been identified in a broad range of marine mammal populations and recent epizootics probably resulted from transfer of virus to immunologically-naive populations.
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25
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Affiliation(s)
- R Sedlmeier
- Abteilung Virusforschung, Max-Planck-Institut für Biochemie, Martinsried, Germany
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26
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Blixenkrone-Møller M, Bolt G, Jensen TD, Harder T, Svansson V. Comparative analysis of the attachment protein gene (H) of dolphin morbillivirus. Virus Res 1996; 40:47-55. [PMID: 8725120 DOI: 10.1016/0168-1702(95)01254-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
DMV, dolphin morbillivirus, a paramyxovirus of uncertain origin recently emerged in Mediterranean dolphins. This study presents the complete nucleotide sequence of the hemagglutinin (H) gene including the gene boundaries. The single open reading frame of the DMV H gene encodes a protein of 604 residues which exhibits overall sequence characteristics similar to the H genes of other morbilliviruses. When compared to its closest homologues, measles virus (MV) and rinderpest virus (RPV), DMV has, respectively, 44 and 46% of amino acid residues in identical positions. The primary sequence of the DMV H protein is markedly less conserved than that of the fusion protein. The comparative data at the genomic level correspond with cross-neutralization studies with different morbilliviruses. Retrospective serogical studies dating back to 1983 indicate DMV-like infections in whales of the eastern Atlantic. The presented data support and extend previous studies suggesting that this novel morbillivirus is one of the phylogenetically oldest morbilliviruses known to circulate today. The relationship of DMV and established morbilliviruses to the newly emerged candidate morbillivirus infecting horse and man is discussed.
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Affiliation(s)
- M Blixenkrone-Møller
- Laboratory of Virology and Immunology, Royal Veterinary and Agricultural University, Frederiksberg, Denmark
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27
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Bolt G, Blixenkrone-Møller M, Gottschalck E, Wishaupt RG, Welsh MJ, Earle JA, Rima BK. Nucleotide and deduced amino acid sequences of the matrix (M) and fusion (F) protein genes of cetacean morbilliviruses isolated from a porpoise and a dolphin. Virus Res 1994; 34:291-304. [PMID: 7531923 DOI: 10.1016/0168-1702(94)90129-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Morbilliviruses have been isolated from stranded dolphins and porpoises. The present paper describes the cloning and sequencing of the porpoise morbillivirus (PMV) F gene and of the dolphin morbillivirus (DMV) M and F genes and their flanking regions. The gene order of the DMV genome appeared to be identical to that of other morbilliviruses. A genomic untranslated region of 837 nucleotides was found between the translated DMV M and F gene regions. The predicted DMV M protein were highly conserved with those of other morbilliviruses. Both the deduced PMV and DMV F0 proteins exhibited three major hydrophobic regions as well as a cysteine rich region, a leucine zipper motif and a cleavage motif allowing cleavage of the F0 protein into F1 and F2 subunits. Apparently the DMV F0 cleavage motif was not modified by adaptation of DMV to Vero cells. The predicted PMV and DMV F proteins were 94% identical. Comparisons with the corresponding sequences of other morbilliviruses demonstrated that the cetacean morbillivirus does not derive from any known morbillivirus but represents an independent morbillivirus lineage.
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Affiliation(s)
- G Bolt
- Department of Veterinary Microbiology, The Royal Veterinary and Agricultural University, Fredericksberg, Denmark
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