Marburg virus

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style="background:#Template:Taxobox colour;"|Marburg virus (MARV)
Transmission electron micrograph of Marburg virus
Transmission electron micrograph of Marburg virus
style="background:#Template:Taxobox colour;" | Virus classification
Group: Group V ((-)ssRNA)
Order: Mononegavirales
Family: Filoviridae
Genus: Marburgvirus
Species: Marburg marburgvirus
This page is about microbiologic aspects of the organism(s).  For clinical aspects of the disease, see Marburg hemorrhagic fever.

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]Associate Editor(s)-in-Chief:

Overview

Marburg virus (/ˈmɑːrbərɡ ˈvaɪrəs/ Template:Respell Template:Respell[1]) is a hemorrhagic fever virus of the Filoviridae family of viruses and a member of the species Marburg marburgvirus, genus Marburgvirus. Marburg virus (MARV) causes Marburg virus disease in humans and nonhuman primates, a form of viral hemorrhagic fever.[2] The virus is considered to be extremely dangerous. The WHO rates it as a Risk Group 4 Pathogen (requiring biosafety level 4-equivalent containment).[3] In the United States, the NIH/National Institute of Allergy and Infectious Diseases ranks it as a Category A Priority Pathogen[4] and the Centers for Disease Control and Prevention lists it as a Category A Bioterrorism Agent.[5] It is also is listed as a biological agent for export control by the Australia Group.[6]

In 2009, expanded clinical trials of an Ebola and Marburg vaccine began in Kampala, Uganda.[7][8]

Discovery

Marburg virus was first described in 1967.[9] It was noticed during small outbreaks in the German cities Marburg and Frankfurt and the Yugoslav capital Belgrade in the 1960s. German workers were accidentally exposed to tissues of infected grivet monkeys (Chlorocebus aethiops) at the city's former main industrial plant, the Behringwerke, then part of Hoechst, and today of CSL Behring. During these outbreaks, 31 people became infected and seven of them died. MARV is a Select Agent,[10]

Nomenclature

The virus is one of two members of the species Marburg marburgvirus, which is included in the genus Marburgvirus, family Filoviridae, order Mononegavirales. The name Marburg virus is derived from Marburg (the city in Hesse, Germany, where the virus was first discovered) and the taxonomic suffix virus.[1]

According to the rules for taxon naming established by the International Committee on Taxonomy of Viruses (ICTV), the name Marburg virus is always to be capitalized, but is never italicized, and may be abbreviated (with MARV being the official abbreviation).

Marburg virus was first introduced under this name in 1967.[9] In 2005, the virus name was changed to Lake Victoria marburgvirus, which unfortunately was the same spelling as its species Lake Victoria marburgvirus.[11][12] However, most scientific articles continued to refer to Marburg virus. Consequently, in 2010, the name Marburg virus was reinstated and the species name changed.[1] A previous abbreviation for the virus was MBGV.

Human disease

Main article: Marburg virus disease

MARV is one of two marburgviruses that causes Marburg virus disease (MVD) in humans (in the literature also often referred to as Marburg hemorrhagic fever, MHF). Both viruses fulfill the criteria for being a member of the species Marburg marburgvirus because their genomes diverge from the prototype Marburg marburgvirus or the Marburg virus variant Musoke (MARV/Mus) by <10% at the nucleotide level.[1]

Recorded outbreaks

Marburg virus disease (MVD) outbreaks due to Marburg virus (MARV) infection
Year Geographic location Human Deaths/Cases (case-fatality rate)
1967 Marburg and Frankfurt, West Germany, and Belgrade, Yugoslavia 7/31 (23%)[9][13][14][15][16][17][18][19]
1975 Rhodesia and Johannesburg, South Africa 1/3 (33%)[20][21][22]
1980 Kenya 1/2 (50%)[23]
1987 Kenya 1/1 (100%)[24][25]
1988 Koltsovo, Soviet Union 1/1 (100%) [laboratory accident][26]
1990 Koltsovo, Soviet Union 0/1 (0%) [laboratory accident][27]
1998–2000 Durba and Watsa, Democratic Republic of the Congo ? (A total of 154 cases and 128 deaths of marburgvirus infection were recorded during this outbreak. The case fatality was 83%. Two different marburgviruses, MARV and Ravn virus (RAVV), cocirculated and caused disease. It has never been published how many cases and deaths were due to MARV or RAVV infection)[28][29][30]
2004–2005 Angola 227/252 (90%)[31][32][33][34][35][36][37]
2007 Uganda 1/3 (33%)[38][39]
2008 Uganda, Netherlands, USA 1/2 (50%)[40]
2012 Uganda 9/18 (50%)[41]
2014 Uganda 1/1 (100%)[42][43]

Virology

Genome

Like all mononegaviruses, marburgvirions contain non-infectious, linear nonsegmented, single-stranded RNA genomes of negative polarity that possesses inverse-complementary 3' and 5' termini, do not possess a 5' cap, are not polyadenylated, and are not covalently linked to a protein.[44] Marburgvirus genomes are approximately 19 kb long and contain seven genes in the order 3'-UTR-NP-VP35-VP40-GP-VP30-VP24-L-5'-UTR.[45] The genomes of the two different marburgviruses (MARV and RAVV) differ in sequence.

Structure

File:Marburg em1986.png
CryoEM reconstruction of a section of the Marburg virus nucleocapsid. EMDB entry EMD-1986[46]

Like all filoviruses, marburgvirions are filamentous particles that may appear in the shape of a shepherd's crook or in the shape of a "U" or a "6", and they may be coiled, toroid, or branched.[45] Marburgvirions are generally 80 nm in width, but vary somewhat in length. In general, the median particle length of marburgviruses ranges from 795 to 828 nm (in contrast to ebolavirions, whose median particle length was measured to be 974–1,086 nm ), but particles as long as 14,000 nm have been detected in tissue culture.[47] Marburgvirions consist of seven structural proteins. At the center is the helical ribonucleocapsid, which consists of the genomic RNA wrapped around a polymer of nucleoproteins (NP). Associated with the ribonucleoprotein is the RNA-dependent RNA polymerase (L) with the polymerase cofactor (VP35) and a transcription activator (VP30). The ribonucleoprotein is embedded in a matrix, formed by the major (VP40) and minor (VP24) matrix proteins. These particles are surrounded by a lipid membrane derived from the host cell membrane. The membrane anchors a glycoprotein (GP1,2) that projects 7 to 10 nm spikes away from its surface. While nearly identical to ebolavirions in structure, marburgvirions are antigenically distinct.

Entry

Niemann–Pick C1 (NPC1) cholesterol transporter protein appears to be essential for infection with both Ebola and Marburg virus. Two independent studies reported in the same issue of Nature showed that Ebola virus cell entry and replication requires NPC1.[48][49] When cells from patients lacking NPC1 were exposed to Ebola virus in the laboratory, the cells survived and appeared immune to the virus, further indicating that Ebola relies on NPC1 to enter cells. This might imply that genetic mutations in the NPC1 gene in humans could make some people resistant to one of the deadliest known viruses affecting humans. The same studies described similar results with Marburg virus, showing that it also needs NPC1 to enter cells.[48][49] Furthermore, NPC1 was shown to be critical to filovirus entry because it mediates infection by binding directly to the viral envelope glycoprotein[49] and that the second lysosomal domain of NPC1 mediates this binding.[50]

In one of the original studies, a small molecule was shown to inhibit Ebola virus infection by preventing the virus glycoprotein from binding to NPC1.[49][51] In the other study, mice that were heterozygous for NPC1 were shown to be protected from lethal challenge with mouse-adapted Ebola virus.[48] Together, these studies suggest NPC1 may be potential therapeutic target for an Ebola antiviral drug.

Replication

The marburg virus life cycle begins with virion attachment to specific cell-surface receptors, followed by fusion of the virion envelope with cellular membranes and the concomitant release of the virus nucleocapsid into the cytosol. The virus RdRp partially uncoats the nucleocapsid and transcribes the genes into positive-stranded mRNAs, which are then translated into structural and nonstructural proteins. Marburgvirus L binds to a single promoter located at the 3' end of the genome. Transcription either terminates after a gene or continues to the next gene downstream. This means that genes close to the 3' end of the genome are transcribed in the greatest abundance, whereas those toward the 5' end are least likely to be transcribed. The gene order is therefore a simple but effective form of transcriptional regulation. The most abundant protein produced is the nucleoprotein, whose concentration in the cell determines when L switches from gene transcription to genome replication. Replication results in full-length, positive-stranded antigenomes that are in turn transcribed into negative-stranded virus progeny genome copies. Newly synthesized structural proteins and genomes self-assemble and accumulate near the inside of the cell membrane. Virions bud off from the cell, gaining their envelopes from the cellular membrane they bud from. The mature progeny particles then infect other cells to repeat the cycle.[11]

Ecology

In 2009, the successful isolation of infectious MARV was reported from caught healthy Egyptian rousettes (Rousettus aegyptiacus).[38] This isolation, together with the isolation of infectious RAVV,[38] strongly suggests that Old World fruit bats are involved in the natural maintenance of marburgviruses. Further studies are necessary to establish whether Egyptian rousettes are the actual hosts of MARV and RAVV or whether they get infected via contact with another animal and therefore serve only as intermediate hosts. Recently the first experimental infection study of Rousettus aegyptiacus with MARV provided further insight into the possible involvement of these bats in MARV ecology.[52] Experimentally infected bats developed relatively low viremia lasting at least 5 days, but remained healthy and didn't develop any notable gross pathology. The virus also replicated to high titers in major organs (liver and spleen), and organs that might possibly be involved in virus transmission (lung, intestine, reproductive organ, salivary gland, kidney, bladder and mammary gland). The relatively long period of viremia noted in this experiment could possibly also facilitate mechanical transmission by blood sucking arthropods or infection of susceptible vertebrate hosts by direct contact with infected blood.

Biological weapon

The Soviet Union had an extensive offensive and defensive biological weapons program that included MARV.[53] At least three Soviet research institutes had MARV research programs during offensive times: the Virology Center of the Scientific-Research Institute for Microbiology in Zagorsk (today Sergiev Posad), the Scientific-Production Association "Vektor" (today the State Research Center of Virology and Biotechnology "Vektor") in Koltsovo, and the Irkutsk Scientific-Research Anti-Plague Institute of Siberia and the Far East in Irkutsk. As most performed research was highly classified, it remains unclear how successful the MARV program was. However, Soviet defector Ken Alibek claimed that a weapon filled with MARV was tested at the Stepnogorsk Scientific Experimental and Production Base in Stepnogorsk, Kazakh Soviet Socialist Republic (today Kazakhstan),[53] suggesting that the development of a MARV biological weapon had reached advanced stages. Independent confirmation for this claim is lacking. At least one laboratory accident with MARV, resulting in the death of Koltsovo researcher Nikolai Ustinov, occurred during offensive times in the Soviet Union and was first described in detail by Alibek.[53] After the dissolution of the Soviet Union, MARV research continued in all three institutes.[citation needed]

In popular culture

Template:Cleanup-list

  • In the non-fiction thriller, The Hot Zone, Richard Preston describes several MARV infections.
  • In the 2008 Indian science fiction movie Dasavathaaram by Kamal Haasan, the plot features an intended bio weapon of "Ebola Marburg" virus.
  • In the TV series Millennium, at the end of Season 2, a "prion version" of MARV causes a disease outbreak in Seattle, killing (amongst others) Frank Black's wife, Catherine. In the Season 3 episode "Collateral Damage", Peter Watt's daughter is infected with MARV by a Gulf War veteran who claims that the Millennium Group did the same to American soldiers during the first Gulf War.
  • In the crossover event of the TV series Medical Investigation, episode 17, and Third Watch, season 6 episode 16, Marburg virus disease breaks out in New York City, killing five of six infected people.
  • In the Sarah Jane Smith series (Series Two), MARV is used as a weapon by a doomsday cult.
  • In the short story Hell Hath Enlarged Herself by Michael Marshall Smith, one of the original scientists is infected with MARV in an attempt to test ImmunityWorks ver. 1.0.
  • In the novel Microserfs by Douglas Coupland, MARV is mentioned several times as a metaphor for the spread of information through the internet
  • In the novel Resident Evil: Caliban Cove, an insane scientist and former professor named Nicolas Griffith is referred to by Rebecca Chambers as having infected three men with MARV after they had been led to believe it was a harmless common cold virus.
  • In the novel Pandora's Legion by Harold Coyle and Barrett Tillman, an Al-Qaeda cell in Pakistan injects volunteers with MARV, who then board flights to major international airports in the western world where the large flow of people would facilitate the spreading of the virus into a pandemic.
  • In the TV series Body of Proof, Season 2, episodes 18 and 19 include a MARV outbreak.
  • In Mira Grant's novel Feed, a modified Marburg virus that cures cancer combines with a virally transmitted cure for the common cold, resulting in a virulent viral plague that turns infected humans and animals into zombies.
  • Motaba, the fictional deadly viral hemorrhagic fever, in the movie Outbreak, is based on MARV.
  • In the video game Trauma Team, the seventh chapter of the game, named "Patient Zero", has a storyline of a mass outbreak of the fictional Rosalia Virus, which has similar symptoms to the Ebola Virus and Marburg Virus.
  • In the episode "The Order 23 Job" of the TV show Leverage, the team's mark is led to believe that he is caught in an outbreak of weaponized Marburg virus made by the Soviets.
  • In the episode "Death Is in the Air" of the TV show Psych, the fictional Thornburg virus is based on the Marburg virus.
  • In the episode "Small Sacrifices" of the TV show "House MD", the team explores Marburg as a diagnosis for a patient
  • In the episode "The Promise" of the Canadian TV show ReGenesis Marburg was the subject of a war games exercise and a weaponized strain out of a lab in South Africa poses a potential threat.
  • In the episode "Honor Among Thieves" of the TV show Person of Interest, the Marburg virus is shown to be used as a potential bioterrorism agent to cause a pandemic starting in New York.
  • In the episode "I Am the Apocalypse" of the TV show Chicago Fire, a man with Marburg virus attempts to start an outbreak in a Chicago hospital.
  • In the TV series Bergerac, a potential Marburg outbreak is the subject of the episode "The Deadly Virus".

References

  1. ↑ 1.0 1.1 1.2 1.3 PMID 21046175 (PMID 21046175)
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  2. ↑ Spickler, Anna. "Ebolavirus and Marburgvirus Infections" (PDF).
  3. ↑ US Department of Health and Human Services. "Biosafety in Microbiological and Biomedical Laboratories (BMBL) 5th Edition". Retrieved 2011-10-16.
  4. ↑ "Biodefense and Emerging Infectious Diseases". US National Institute of Allergy and Infectious Diseases (NIAID), US National Institutes of Health (NIH). Retrieved 2011-10-16.
  5. ↑ US Centers for Disease Control and Prevention (CDC). "Bioterrorism Agents/Diseases". Retrieved 2011-10-16.
  6. ↑ The Australia Group. "List of Biological Agents for Export Control". Retrieved 2011-10-16.
  7. ↑ Beth Skwarecki Ebola, Marburg DNA Vaccines Prove Safe in Phase 1 Trial Medscape Medical News, September 17, 2014
  8. ↑ Evaluating an Ebola and a Marburg Vaccine in Uganda U.S. Department of Health & Human Services
  9. ↑ 9.0 9.1 9.2 PMID 4294540 (PMID 4294540)
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  10. ↑ US Animal and Plant Health Inspection Service (APHIS) and US Centers for Disease Control and Prevention (CDC). "National Select Agent Registry (NSAR)". Retrieved 2011-10-16.
  11. ↑ 11.0 11.1 Feldmann, H.; Geisbert, T. W.; Jahrling, P. B.; Klenk, H.-D.; Netesov, S. V.; Peters, C. J.; Sanchez, A.; Swanepoel, R.; et al. (2005). "Family Filoviridae". In Fauquet, C. M.; Mayo, M. A.; Maniloff, J.; Desselberger, U.; Ball, L. A. Virus Taxonomy—Eighth Report of the International Committee on Taxonomy of Viruses. San Diego, US: Elsevier/Academic Press. pp. 645–653. ISBN 0-12-370200-3
  12. ↑ Mayo, M. A. (2002). "ICTV at the Paris ICV: results of the plenary session and the binomial ballot". Archives of Virology. 147 (11): 2254–60. doi:10.1007/s007050200052.
  13. ↑ PMID 4168558 (PMID 4168558)
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  14. ↑ PMID 4296724 (PMID 4296724)
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  15. ↑ PMID 4966280 (PMID 4966280)
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  16. ↑ PMID 4966281 (PMID 4966281)
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  17. ↑ PMID 5005859 (PMID 5005859)
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  18. ↑ PMID 5748997 (PMID 5748997)
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  19. ↑ Stojkovic, L.; Bordjoski, M.; Gligic, A.; Stefanovic, Z. (1971). "Two Cases of Cercopithecus-Monkeys-Associated Haemorrhagic Fever". In Martini, G. A.; Siegert, R. Marburg Virus Disease. Berlin, Germany: Springer-Verlag. pp. 24–33. ISBN 978-0-387-05199-4
  20. ↑ PMID 811315 (PMID 811315)
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  21. ↑ PMID 406394 (PMID 406394)
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  22. ↑ PMID 569445 (PMID 569445)
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  23. ↑ PMID 6122054 (PMID 6122054)
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  24. ↑ Marburg and Ebola viruses; Advances in Virus Research; Volume 47, 1996, Pages 1–52
  25. ↑ Known Cases and Outbreaks of Marburg Hemorrhagic Fever, in Chronological Order
  26. ↑ PMID 10024977 (PMID 10024977)
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  27. ↑ PMID 7941853 (PMID 7941853)
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  28. ↑ PMID 10546197 (PMID 10546197)
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  29. ↑ PMID 14720391 (PMID 14720391)
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  30. ↑ PMID 16943403 (PMID 16943403)
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  31. ↑ PMID 16038348 (PMID 16038348)
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  32. ↑ PMID 15917379 (PMID 15917379)
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  33. ↑ PMID 16775337 (PMID 16775337)
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  34. ↑ PMID 17940944 (PMID 17940944)
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  35. ↑ PMID 17940945 (PMID 17940945)
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  36. ↑ PMID 18838150 (PMID 18838150)
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  37. ↑ PMID 20441515 (PMID 20441515)
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  38. ↑ 38.0 38.1 38.2 PMID 19649327 (PMID 19649327)
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  39. ↑ PMID 21987753 (PMID 21987753)
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  40. ↑ PMID 19751577 (PMID 19751577)
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  41. ↑ "Marburg hemorrhagic fever outbreak continues in Uganda". October 2012.
  42. ↑ "1st LD-Writethru: Deadly Marburg hemorrhagic fever breaks out in Uganda". October 5, 2014.
  43. ↑ Ntale, Samson (October 8, 2014). "99 in Uganda quarantined after Marburg virus death". CNN. Retrieved 2014-10-19.
  44. ↑ Pringle, C. R. (2005). "Order Mononegavirales". In Fauquet, C. M.; Mayo, M. A.; Maniloff, J.; Desselberger, U.; Ball, L. A. Virus Taxonomy—Eighth Report of the International Committee on Taxonomy of Viruses. San Diego, US: Elsevier/Academic Press. pp. 609–614. ISBN 0-12-370200-3
  45. ↑ 45.0 45.1 PMID 7118520 (PMID 7118520)
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  46. ↑ Template:Cite PMID
  47. ↑ PMID 8837880 (PMID 8837880)
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  48. ↑ 48.0 48.1 48.2 Carette JE, Raaben M, Wong AC, Herbert AS, Obernosterer G, Mulherkar N, Kuehne AI, Kranzusch PJ, Griffin AM, Ruthel G, Dal Cin P, Dye JM, Whelan SP, Chandran K, Brummelkamp TR (September 2011). "Ebola virus entry requires the cholesterol transporter Niemann-Pick C1". Nature. 477 (7364): 340–3. doi:10.1038/nature10348. PMC 3175325. PMID 21866103. Lay summary – New York Times.
  49. ↑ 49.0 49.1 49.2 49.3 Côté M, Misasi J, Ren T, Bruchez A, Lee K, Filone CM, Hensley L, Li Q, Ory D, Chandran K, Cunningham J (September 2011). "Small molecule inhibitors reveal Niemann-Pick C1 is essential for Ebola virus infection". Nature. 477 (7364): 344–8. doi:10.1038/nature10380. PMC 3230319. PMID 21866101. Lay summary – New York Times.
  50. ↑ Miller EH, Obernosterer G, Raaben M, Herbert AS, Deffieu MS, Krishnan A, Ndungo E, Sandesara RG, Carette JE, Kuehne AI, Ruthel G, Pfeffer SR, Dye JM, Whelan SP, Brummelkamp TR, Chandran K (March 2012). "Ebola virus entry requires the host-programmed recognition of an intracellular receptor". EMBO Journal. 31 (8): 1947–60. doi:10.1038/emboj.2012.53. PMC 3343336. PMID 22395071.
  51. ↑ Flemming A (October 2011). "Achilles heel of Ebola viral entry". Nat Rev Drug Discov. 10 (10): 731. doi:10.1038/nrd3568. PMID 21959282.
  52. ↑ Paweska, J. T.; Jansen Van Vuren, P.; Masumu, J.; Leman, P. A.; Grobbelaar, A. A.; Birkhead, M.; Clift, S.; Swanepoel, R.; Kemp, A. (2012). "Virological and Serological Findings in Rousettus aegyptiacus Experimentally Inoculated with Vero Cells-Adapted Hogan Strain of Marburg Virus". PLoS ONE. 7 (9): e45479. doi:10.1371/journal.pone.0045479. PMC 3444458. PMID 23029039. open access publication – free to read
  53. ↑ 53.0 53.1 53.2 Alibek, Steven; Handelman. Biohazard: The Chilling True Story of the Largest Covert Biological Weapons Program in the World—Told from Inside by the Man Who Ran It. New York: Random House. ISBN 0-385-33496-6

Further reading

  • Klenk, Hans-Dieter (1999). Marburg and Ebola Viruses. Current Topics in Microbiology and Immunology, vol. 235. Berlin, Germany: Springer-Verlag. ISBN 978-3-540-64729-4
  • Klenk, Hans-Dieter; Feldmann, Heinz (2004). Ebola and Marburg Viruses: Molecular and Cellular Biology. Wymondham, Norfolk, UK: Horizon Bioscience. ISBN 978-1-904933-49-6
  • Kuhn, Jens H. (2008). Filoviruses: A Compendium of 40 Years of Epidemiological, Clinical, and Laboratory Studies. Archives of Virology Supplement, vol. 20. Vienna, Austria: SpringerWienNewYork. ISBN 978-3-211-20670-6
  • Martini, G. A.; Siegert, R. (1971). Marburg Virus Disease. Berlin, Germany: Springer-Verlag. ISBN 978-0-387-05199-4.
  • Ryabchikova, Elena I.; Price, Barbara B. (2004). Ebola and Marburg Viruses: A View of Infection Using Electron Microscopy. Columbus, Ohio, US: Battelle Press. ISBN 978-1-57477-131-2

External links

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