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Merkel cell polyomavirus

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cDNA was found that was similar to sequences of known polyomaviruses but clearly distinct enough that it could be shown to be a new virus. Genetic sequences from nearly 400,000 mRNAs were analyzed for the study. Once the virus was found, Feng and coworkers quickly determined that infected Merkel cell carcinomas have the virus in an integrated monoclonal pattern and 80% of tissues taken from patients with MCC were positive for the virus. This was quickly confirmed by studies of MCC patients from around the world, including evidence for monoclonal integration of the virus in these tumors.
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replicating independently from the host cancer cell. The tumor is therefore a "dead-end host" for MCV. Normally, the virus exists as circular episome (or plasmid) within the cell and its DNA is packaged into viral capsids and transmitted to other cells. In tumors, the viral DNA has broken and become integrated into human DNA within the tumor, so that the virus is no longer transmissible. The integrated virus cannot be excised from the host cell and it must replicate as the host cell is replicated. Examination of infected tumors reveals that the majority have a clear
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immunosuppression (e.g., AIDS or organ transplant patients) are at higher risk for this cancer and may benefit from periodic skin examinations. Emergence of a painless lump that expands rapidly, especially among persons over age 50 or persons with immunosuppression, warrants examination by a physician. Biopsy of a Merkel cell tumor should readily provide a diagnosis and when caught early, has a good prognosis through standard treatment. At this time there are no vaccines or medications that can prevent MCV infection or prevent emergence of Merkel cell carcinoma.
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also account for some of the negative results. Only a very small proportion of people infected with MCV develop the cancer. At this time no test for the presence of the virus is generally available, nor would patients be advised to change their treatment based on knowledge of MCV infection status. MCC patients can be enrolled in research studies, but these are not likely to directly benefit participants. Reducing risk of UV exposure through sun screens is likely to reduce the risk of Merkel cell carcinoma as well as other skin cancers.
193:. Approximately 80% of Merkel cell carcinoma (MCC) tumors have been found to be infected with MCV. MCV appears to be a common—if not universal—infection of older children and adults. It is found in respiratory secretions, suggesting that it might be transmitted via a respiratory route. However, it has also been found elsewhere, such as in shedded healthy skin and gastrointestinal tract tissues, thus its precise mode of transmission remains unknown. In addition, recent studies suggest that this virus may latently infect the human sera and 35: 241: 253: 505:
indicating that the proto-tumor cell was infected with the virus prior to its cancerous expansion. Mutations in the T antigen render the virus noninfectious, and therefore it is not a passenger virus that infected the tumor after the tumor had already started. Finally, the T antigen oncogene is expressed in all of the tumor cells and when it is inhibited ("knocked down" by
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that a promising rational drug target was uncovered within four years of the initial discovery of the virus and that other new treatments might be rapidly developed now that the cause of the cancer is known. MCV is a target for cell-mediated immune responses, and so important research efforts are being focused on immunologic therapies that may benefit MCC patients.
509:), MCV-positive cells die. Thus, the virus is required for MCV-positive tumors to grow. It is likely that additional host cell mutations act in concert with the integrated virus to actually cause the tumor. Merkel cell carcinoma is associated with exposure to ultraviolet (UV) light and to ionizing radiation, and it is likely that these 412:
complete MCV genome (MCV-HF) was designed from multiple tumor-type MCV genomes and examined with successful replication capability in vitro. The identical sequences were found in human normal skins. While the precise prevalence of infection is unknown in humans, it is likely that most infections do not cause cancers.
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Treatment guidelines do not differ for Merkel cell carcinoma infected with MCV or without MCV. A recent country-wide study from Finland suggests that MCV-positive tumors have a better prognosis than uninfected tumors (although this has not been found in other studies). If this is confirmed, routine
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Eight of 10 Merkel cell carcinoma tumors initially tested were found to be infected with MCV. In these tumors, the virus has integrated into the cancer cell genome and can no longer freely replicate. Recent studies from other laboratories have reproduced these findings: in one study 30 of 39 (77%)
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The reasons why 20% of Merkel cell carcinoma are negative for the virus remain completely unknown but speculations include the possibility that "Merkel cell carcinoma" is actually two or more closely related cancers, only one of which is infected with MCV. Misdiagnosis of this difficult cancer may
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and sequenced to a depth likely to sequence a viral cDNA if it is present. The sequences are then compared with the human genome and all human sequences are "subtracted" to leave a group of sequences that are most likely nonhuman. When this was performed on four cases of Merkel cell carcinoma, one
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pattern, indicating that the virus integrated into a single cell before it began its cancerous expansion. For this reason, there is very strong evidence that MCV causes some, but not all, Merkel cell carcinomas. MCV can also be found in healthy tissues from people without Merkel cell carcinoma. A
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oncoprotein is activated by MCV large T protein targeting the cellular retinoblastoma protein and that survivin inhibitors can delay tumor progression in animal models. Clinical trials are now being organized to determine whether this has any benefit in humans. The importance of this finding is
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Persons who have Merkel cell carcinoma with this virus are not infectious to others and no infectious restrictions are warranted. The reasons for this are: 1) the virus in tumors is already mutated and no longer can be transmitted from tumors, and 2) most persons are already naturally exposed to
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known as MCV-miR-M1 from its late strand which bears perfect complementarity to LT and has been shown to negatively regulate LT expression . In addition to its role in regulating MCV LT expression and DNA replication, MCV-miR-M1 has been shown to directly target and downregulate the expression of
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from the virus are inhibited. Knockdown of these viral proteins causes cells from MCV-positive MCC tumors to die whereas there is no effect on cells from tumors that are uninfected with the virus. This indicates that MCV is necessary to maintain the virus-positive tumor cells. Further, clonal
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While the original authors conservatively noted that it is "too early to tell" whether MCV is a cause of Merkel cell carcinoma, general scientific opinion now suggests that the virus causes most, but not all Merkel cell tumors. The virus is monoclonally integrated into the tumor when present,
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Antibodies have been developed to stain for T antigen in tumor tissues and appear to be specific for MCV-infected tumor cells. Blood tests have also been developed that show the majority of adults have been previously exposed to MCV and may continue to carry it as an asymptomatic infection.
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Based on current data, prevention advice for MCC is similar to other skin cancers, such as avoiding sunburns and unnecessary sun exposure together with use of sun lotion. This may prevent mutations in the virus that increase risk for MCC among those already infected with MCV. Persons with
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Sequencing of the virus from Merkel cell cancers reveals that it generally has tumor-specific mutations that truncate the MCV T antigen. These mutations (which are not found in native virus obtained from nontumor sites) eliminate the T antigen helicase, preventing the integrated virus from
436:. Caution is needed in interpreting results from PCR since it is prone to false-positive contamination and a substantial fraction of healthy skin samples may harbor low-level infection. Sequencing of the viral genome may determine whether or not tumor-specific mutations are present. 317:, and is expressed in human tumors. The T antigen is a spliced gene that forms multiple different proteins depending on the splicing pattern. Both large T and small T oncoproteins are probably needed to transform healthy cells into cancer cells, and they act by targeting 2211:
Sastre-Garau X, Peter M, Avril MF, Laude H, Couturier J, Rozenberg F, Almeida A, Boitier F, Carlotti A, Couturaud B, Dupin N (May 2009). "Merkel cell carcinoma of the skin: pathological and molecular evidence for a causative role of MCV in oncogenesis".
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Possible associations with cervical carcinoma, cutaneous squamous cell carcinoma, Bowen's disease, basal cell skin carcinoma, extrapulmonary small cell carcinoma, and EGFR mutation-driven non-small cell lung cancer have been reported.
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Murakami M, Imajoh M, Ikawa T, Nakajima H, Kamioka M, Nemoto Y, Ujihara T, Uchiyama J, Matsuzaki S, Sano S, Daibata M (January 2011). "Presence of Merkel cell polyomavirus in Japanese cutaneous squamous cell carcinoma".
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Shuda M, Arora R, Kwun HJ, Feng H, Sarid R, Fernández-Figueras MT, Tolstov Y, Gjoerup O, Mansukhani MM, Swerdlow SH, Chaudhary PM, Kirkwood JM, Nalesnik MA, Kant JA, Weiss LM, Moore PS, Chang Y (September 2009).
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Moore has suggested that if his findings are confirmed, information about the virus could lead to a blood test or a vaccine that could improve the management of the disease or aid in prevention, much as the
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Xu S, Jiang J, Yu X, Sheng D, Zhu T, Jin M (March 2014). "Association of Merkel cell polyomavirus infection with EGFR mutation status in Chinese non-small cell lung cancer patients".
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Most MCV viruses found in MCC tumors, however, have at least two mutations that render the virus nontransmissible: 1) The virus is integrated into the host genome and 2) The viral T
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Bichakjian CK, Lowe L, Lao CD, Sandler HM, Bradford CR, Johnson TM, Wong SL (July 2007). "Merkel cell carcinoma: critical review with guidelines for multidisciplinary management".
1444:"A Comprehensive Analysis of Replicating Merkel Cell Polyomavirus Genomes Delineates the Viral Transcription Program and Suggests a Role for mcv-miR-M1 in Episomal Persistence" 1265:"A Comprehensive Analysis of Replicating Merkel Cell Polyomavirus Genomes Delineates the Viral Transcription Program and Suggests a Role for mcv-miR-M1 in Episomal Persistence" 279:, the earliest virus of the group to be discovered, and does not imply that MCV is transmitted to humans from rodents.) Although it has been confused with the controversial 368:. Although rare compared with other skin cancers, the incidence of Merkel cell carcinoma in the United States tripled between 1986 and 2001, to around 1400 cases per year. 3296: 444:
detection of the virus may provide a future benefit for medical guidance. The virus itself is not known to be susceptible to current antiviral medications.
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motif needed for virus replication that is deleted in MCC tumors. Unlike for other polyomaviruses, MCV sT antigen transforms cells in vitro by activating
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pattern of MCV insertions into MCC cell genomes indicates that the virus was present in the Merkel cell before it underwent cancerous transformation. The
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Pawlita M, Clad A, zur Hausen H (May 1985). "Complete DNA sequence of lymphotropic papovavirus: prototype of a new species of the polyomavirus genus".
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Arora R, Shuda M, Guastafierro A, Feng H, Toptan T, Tolstov Y, Normolle D, Vollmer LL, Vogt A, Dömling A, Brodsky JL, Chang Y, Moore PS (May 2012).
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Seo GJ, Chen CJ, Sullivan CS (January 2009). "Merkel cell polyomavirus encodes a microRNA with the ability to autoregulate viral gene expression".
1970:"Comparable expression and phosphorylation of the retinoblastoma protein in Merkel cell polyoma virus-positive and negative Merkel cell carcinoma" 798:"Human Merkel cell polyomavirus infection II. MCV is a common human infection that can be detected by conformational capsid epitope immunoassays" 2605: 2017:
Busam KJ, Jungbluth AA, Rekthman N, Coit D, Pulitzer M, Bini J, Arora R, Hanson NC, Tassello JA, Frosina D, Moore P, Chang Y (September 2009).
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Detection of the virus is still at a research phase and is generally not available as a clinical test. Detection of viral DNA is performed by
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that occur at increased frequency in immunosuppressed people. Other factors associated with the development of this cancer include exposure to
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Rotondo JC, Bononi I, Puozzo A, Govoni M, Foschi V, Lanza G, Gafà R, Gaboriaud P, Touzé FA, Selvatici R, Martini F, Tognon M (July 2017).
271:. MCV is the fifth polyomavirus that infects humans to be discovered. It belongs to the murine polyomavirus group, one of the three main 213: 1679:"Frequent detection of Merkel cell polyomavirus in human Merkel cell carcinomas and identification of a unique deletion in the VP1 gene" 2976: 2807: 1189: 468: 1399: 996:"Droplet-digital PCR assay to detect Merkel cell polyomavirus sequences in chorionic villi from spontaneous abortion affected females" 2847: 1921:"Human Merkel cell polyomavirus infection I. MCV T antigen expression in Merkel cell carcinoma, lymphoid tissues and lymphoid tumors" 248:
by expressing MCV structural proteins in cells. The 55–60 nm viral capsids have typical icosahedral symmetry found in polyomaviruses.
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increase the rate of mutation in either the virus or the Merkel cell genome, contributing to the risk for cancer after infection.
383:, and this association suggests the possibility that a virus or other infectious agent might be involved in causing the cancer. 290:(formerly known as African green monkey lymphotropic papovavirus), which is consistent with MCV coevolving with human primates. 2661: 2712: 2304: 310: 3795: 2940: 471:
by a physical subtraction method in 1994. A virtual subtraction method was developed by Huichen Feng in the lab as a novel
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Merkel cell carcinoma is mainly seen in older individuals. It is known to occur at increased frequency in people with
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has truncation mutations that leave the T antigen unable to initiate DNA replication needed to propagate the virus.
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Mazzoni E, Rotondo JC, Marracino L, Selvatici R, Bononi I, Torreggiani E, Touzé A, Martini F, Tognon MG (2017).
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Tolstov YL, Pastrana DV, Feng H, Becker JC, Jenkins FJ, Moschos S, Chang Y, Buck CB, Moore PS (September 2009).
2901: 2887: 309:(LT and sT, respectively, from early strand) and viral capsid proteins VP1 and VP2/3 genes (from late strand) 34: 3262: 2591: 1316:"Human Merkel cell polyomavirus small T antigen is an oncoprotein targeting the 4E-BP1 translation regulator" 1165: 3339: 403:
of Merkel cell tumors were MCV positive; in another study, 45 of 53 (85%) Merkel cell tumors were positive.
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Sloots, Theo P.; Nissen, Michael D.; Whiley, David M.; Lambert, Stephen B.; Bialasiewicz, Seweryn (2009).
3469: 3395: 3389: 3062: 1828:"Merkel cell polyomavirus and two previously unknown polyomaviruses are chronically shed from human skin" 2307:. KSHV laboratory, molecular virology program, University of Pittsburgh Cancer Institute. Archived from 1400:"MCV-miR-M1 Targets the Host-Cell Immune Response Resulting in the Attenuation of Neutrophil Chemotaxis" 3790: 472: 256:
A complete MCV genome was designed from multiple Merkel Cell carcinoma tumors and normal human tissues.
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and its role in the establishment of long-term persistent infection has been demonstrated in vitro.
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in 1972 as "trabecular tumor of the skin". Based on its origin, the cancer cell type is called a
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Imajoh M, Hashida Y, Nemoto Y, Oguri H, Maeda N, Furihata M, Fukaya T, Daibata M (August 2012).
313:. MCV T antigen has similar features to the T antigens of other polyomaviruses, which are known 3715: 3425: 3403: 3282: 3278: 3274: 3270: 3225: 3163: 3057: 3018: 2821: 2257:"Getting stronger: the relationship between a newly identified virus and Merkel cell carcinoma" 322: 2068:"Clinical factors associated with Merkel cell polyomavirus infection in Merkel cell carcinoma" 637:
Feng H, Taylor JL, Benos PV, Newton R, Waddell K, Lucas SB, Chang Y, Moore PS (October 2007).
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Houben R, Shuda M, Weinkam R, Schrama D, Feng H, Chang Y, Moore PS, Becker JC (July 2010).
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Chang Y, Cesarman E, Pessin MS, Lee F, Culpepper J, Knowles DM, Moore PS (December 1994).
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Kassem A, Schöpflin A, Diaz C, Weyers W, Stickeler E, Werner M, Zur Hausen A (July 2008).
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Theiss JM, GĂĽnther T, Alawi M, Neumann F, Tessmer U, Fischer N, Grundhoff A (July 2015).
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Theiss JM, GĂĽnther T, Alawi M, Neumann F, Tessmer U, Fischer N, Grundhoff A (July 2015).
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Evidence that MCV is the cause for most MCC tumors comes from studies in which T antigen
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Houben R, Schrama D, Alb M, Pföhler C, Trefzer U, Ugurel S, Becker JC (February 2010).
1945: 1920: 1900: 1852: 1827: 1800: 1765: 1656: 1568: 1470: 1443: 1340: 1315: 1291: 1264: 1135: 1110: 1086: 1052:"T antigen mutations are a human tumor-specific signature for Merkel cell polyomavirus" 1051: 971: 944: 920: 895: 871: 846: 822: 797: 768: 741: 663: 638: 611: 578: 484: 353: 2158:"Identification of herpesvirus-like DNA sequences in AIDS-associated Kaposi's sarcoma" 1644: 3659: 3610: 3591: 3572: 3362: 3358: 3354: 3350: 3267: 3172: 2876: 2754: 2558: 2523: 2470: 2435: 2399: 2286: 2229: 2185: 2138: 2089: 2048: 1991: 1950: 1892: 1857: 1805: 1746: 1725:"MC polyomavirus is frequently present in Merkel cell carcinoma of European patients" 1700: 1648: 1609: 1604: 1587: 1560: 1510: 1475: 1424: 1380: 1345: 1296: 1245: 1241: 1183: 1140: 1091: 1027: 976: 925: 876: 827: 773: 719: 668: 616: 396: 131: 2241: 2197: 1904: 1660: 1572: 945:"Detection of Merkel Cell Polyomavirus DNA in Serum Samples of Healthy Blood Donors" 3634: 3344: 3024: 2956: 2837: 2768: 2676: 2550: 2513: 2505: 2462: 2427: 2389: 2379: 2276: 2268: 2221: 2177: 2128: 2120: 2079: 2038: 2030: 2003: 1981: 1940: 1932: 1884: 1847: 1839: 1795: 1785: 1736: 1690: 1640: 1599: 1550: 1542: 1502: 1465: 1455: 1414: 1372: 1335: 1327: 1286: 1276: 1237: 1130: 1122: 1081: 1071: 1017: 1007: 966: 956: 915: 907: 866: 858: 817: 809: 763: 753: 709: 699: 658: 650: 606: 598: 534: 464: 376: 372: 318: 3598: 2554: 2308: 1695: 1678: 704: 687: 3558: 3463: 3383: 3372: 3243: 3207: 3127: 2913: 2774: 2671: 2641: 2636: 2631: 2626: 2124: 2034: 1790: 1460: 1281: 1050:
Shuda M, Feng H, Kwun HJ, Rosen ST, Gjoerup O, Moore PS, Chang Y (October 2008).
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Tagliapietra A, Rotondo JC, Bononi I, Mazzoni E, Magagnoli F, Maritati M (2020).
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Allander, Tobias; Tiveljung-Lindell, Annika; Lindau, Cecilia; Goh, Shan (2009).
847:"Merkel Cell Polyomavirus DNA in Respiratory Specimens from Children and Adults" 3738: 2794: 1843: 1723:
Becker JC, Houben R, Ugurel S, Trefzer U, Pföhler C, Schrama D (January 2009).
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Proceedings of the National Academy of Sciences of the United States of America
170:. It was the first example of a human viral pathogen discovered using unbiased 119: 107: 2466: 2431: 3784: 2789: 2784: 2732: 2352: 433: 264: 83: 2384: 2181: 1888: 1766:"Cellular and viral factors regulating Merkel cell polyomavirus replication" 1076: 961: 602: 3650: 3500: 3178: 3039: 2615: 2562: 2527: 2474: 2439: 2403: 2290: 2233: 2142: 2093: 2066:
Sihto H, Kukko H, Koljonen V, Sankila R, Böhling T, Joensuu H (July 2009).
2052: 1995: 1954: 1896: 1861: 1809: 1750: 1704: 1652: 1588:"Merkel cell carcinoma in a renal transplant patient: increased incidence?" 1564: 1479: 1428: 1384: 1349: 1300: 1144: 1095: 1031: 980: 929: 911: 880: 862: 831: 777: 723: 672: 620: 298: 260: 244:
Electron microphotograph (x50,000) of MCV capsids artificially produced as
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Schowalter RM, Pastrana DV, Pumphrey KA, Moyer AL, Buck CB (June 2010).
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Akhbari P, Tobin D, Poterlowicz K, Roberts W, Boyne JR (November 2018).
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this virus as children and young adults by other asymptomatic carriers.
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Feng H, Kwun HJ, Liu X, Gjoerup O, Stolz DB, Chang Y, Moore PS (2011).
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Engels EA, Frisch M, Goedert JJ, Biggar RJ, Miller RW (February 2002).
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Viscidi RP, Shah KV (February 2008). "Cancer. A skin cancer virus?".
1331: 579:"Clonal integration of a polyomavirus in human Merkel cell carcinoma" 268: 182: 3709: 2488:
Hourdequin KC, Lefferts JA, Brennick JB, Ernstoff MS, Tsongalis GJ,
2353:"newly discovered virus linked to neuroendocrine cancer of the skin" 1628: 3732: 3683: 3330: 3072: 2928: 2157: 510: 448: 392: 337: 326: 314: 224: 2494:"Merkel cell polyomavirus and extrapulmonary small cell carcinoma" 2487: 893: 3436: 2727: 2332:. University of Pittsburgh Medical Center News Bureau. 2007-01-17 740:
Kean JM, Rao S, Wang M, Garcea RL (March 2009). Atwood WJ (ed.).
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Shuda M, Kwun HJ, Feng H, Chang Y, Moore PS (September 2011).
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Toker C (January 1972). "Trabecular carcinoma of the skin".
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Williams RH, Morgan MB, Mathieson IM, Rabb H (May 1998).
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has recently classified MCV as a class 2A carcinogen.
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virus in some blog postings, it is a distinct virus.
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Feng H, Shuda M, Chang Y, Moore PS (February 2008).
185:. It is suspected to cause the majority of cases of 2305:"New Pathogen Discovery:Frequently Asked Questions" 730: 576: 293:The prototype sequence of MCV has a 5387 base pair 1917: 1816: 1763: 1528: 1526: 1524: 1313: 1049: 1045: 1043: 1041: 739: 455: 3782: 1718: 1716: 1714: 1521: 1362: 1038: 286:MCV is genetically most closely related to the 2540: 2481: 2350: 288:African green monkey lymphotropic polyomavirus 2713: 2599: 391:are examples of tumors known to have a viral 181:. MCV is one of seven currently known human 2410: 2248: 1911: 1711: 1620: 1307: 632: 630: 1874: 1579: 1221: 791: 789: 787: 572: 570: 568: 566: 564: 562: 560: 558: 275:of polyomaviruses. (The group is named for 2977:Progressive multifocal leukoencephalopathy 2720: 2706: 2606: 2592: 2452: 2359: 2023:The American Journal of Surgical Pathology 742:"Seroepidemiology of human polyomaviruses" 2848:Extranodal NK/T-cell lymphoma, nasal type 2517: 2393: 2383: 2280: 2132: 2083: 2042: 1985: 1944: 1851: 1799: 1789: 1740: 1694: 1629:"Merkel cell carcinoma and HIV infection" 1603: 1554: 1469: 1459: 1418: 1339: 1290: 1280: 1134: 1085: 1075: 1021: 1011: 970: 960: 919: 870: 821: 767: 757: 713: 703: 662: 627: 610: 483:to search for the presence of a virus in 166:) was first described in January 2008 in 2613: 2261:The Journal of Investigative Dermatology 2254: 2072:Journal of the National Cancer Institute 1729:The Journal of Investigative Dermatology 1407:The Journal of Investigative Dermatology 784: 555: 301:genes from opposite strands including a 251: 239: 223: 2579:KSHV Laboratory: New pathogen discovery 2446: 469:Kaposi's sarcoma-associated herpesvirus 3783: 2662:Trichodysplasia spinulosa polyomavirus 2534: 1188:: CS1 maint: archived copy as title ( 3714: 3713: 2701: 2587: 1492: 1320:The Journal of Clinical Investigation 540: 349:Viral cause for Merkel cell carcinoma 2322: 533:, or it could knock out a gene that 500:As a cause for Merkel cell carcinoma 416:Prevention, diagnosis, and treatment 341:host cell immune related transcript 2998:Subacute sclerosing panencephalitis 13: 2453:Zur Hausen A (December 2009). "". 297:genome and encodes characteristic 195:peripheral blood mononuclear cells 14: 3807: 3317:Severe acute respiratory syndrome 2843:Follicular dendritic cell sarcoma 2572: 2255:Buck CB, Lowy DR (January 2009). 477:digital transcriptome subtraction 219: 179:digital transcriptome subtraction 3303:Middle East respiratory syndrome 1605:10.1097/00007890-199805270-00019 491:from a tumor are converted into 189:, a rare but aggressive form of 33: 2344: 2297: 2204: 2149: 2100: 2059: 2010: 1974:International Journal of Cancer 1961: 1925:International Journal of Cancer 1868: 1757: 1486: 1435: 1391: 1356: 1256: 1196: 1151: 1102: 802:International Journal of Cancer 447:Recent studies reveal that the 356:is a highly aggressive type of 2902:Adult T-cell leukemia/lymphoma 2888:Splenic marginal zone lymphoma 2113:Science Translational Medicine 987: 936: 887: 838: 679: 456:Discovery and characterization 325:. The LT antigen possesses a 1: 2555:10.1016/j.lungcan.2014.01.002 2351:Allison Gandey (2008-01-18). 1696:10.1158/0008-5472.CAN-08-0949 1645:10.1016/S0140-6736(02)07668-7 705:10.1158/1078-0432.CCR-16-2899 549: 263:are small (~5400 base pair), 3107:Tropical spastic paraparesis 3012:Lymphocytic choriomeningitis 2420:Journal of Clinical Virology 2125:10.1126/scitranslmed.3003713 2035:10.1097/PAS.0b013e3181aa30a5 1791:10.1371/journal.pone.0022468 1461:10.1371/journal.ppat.1004974 1282:10.1371/journal.ppat.1004974 1242:10.1016/0042-6822(85)90108-4 900:Emerging Infectious Diseases 851:Emerging Infectious Diseases 759:10.1371/journal.ppat.1000363 523:human papillomavirus vaccine 360:that was first described by 7: 3796:Infectious causes of cancer 3470:Cytomegalovirus esophagitis 3390:Human parainfluenza viruses 3063:Ramsay Hunt syndrome type 2 1377:10.1016/j.virol.2008.11.001 295:double-stranded DNA (dsDNA) 10: 3812: 1844:10.1016/j.chom.2010.05.006 1507:10.1001/archderm.105.1.107 1420:10.1016/j.jid.2018.03.1527 473:high-throughput sequencing 175:next-generation sequencing 3722: 3673: 3649: 3557: 3480: 3435: 3424: 3253: 3215: 3194: 3162: 3134:Cytomegalovirus retinitis 3117: 3071: 2950: 2939: 2912: 2739: 2622: 2467:10.1007/s00292-009-1222-4 2432:10.1016/j.jcv.2010.09.013 331:cap-dependent translation 28: 21: 3754:Merkel cell polyomavirus 3724:Merkel cell polyomavirus 3236:Infectious mononucleosis 3053:Chandipura vesiculovirus 2883:Hepatocellular carcinoma 2828:Nasopharyngeal carcinoma 2761:Hepatocellular carcinoma 2647:Merkel cell polyomavirus 2355:. MedScape Medical News. 2214:The Journal of Pathology 692:Clinical Cancer Research 177:with a technique called 168:Pittsburgh, Pennsylvania 156:Merkel cell polyomavirus 3032:Encephalitis lethargica 2733:viral systemic diseases 2687:New Jersey polyomavirus 2385:10.1186/1743-422x-9-154 2182:10.1126/science.7997879 1889:10.1126/science.1155048 1832:Cell Host & Microbe 1495:Archives of Dermatology 1077:10.1073/pnas.0806526105 962:10.3389/fonc.2017.00294 603:10.1126/science.1152586 535:suppresses tumor growth 525:can be used to prevent 3404:Human orthopneumovirus 3058:Herpesviral meningitis 3019:Arbovirus encephalitis 912:10.3201/eid1503.081206 863:10.3201/eid1503.081067 487:. In this method, all 481:New Pathogen Discovery 323:retinoblastoma protein 257: 249: 237: 2862:Merkel-cell carcinoma 2682:Human polyomavirus 12 377:transplant recipients 366:neuroectodermal tumor 354:Merkel cell carcinoma 336:MCV also expresses a 255: 243: 227: 187:Merkel cell carcinoma 3507:Adenovirus infection 2971:Human polyomavirus 2 2800:Oropharyngeal cancer 2667:Human polyomavirus 9 2657:Human polyomavirus 7 2652:Human polyomavirus 6 2510:10.3892/ol.2013.1483 2273:10.1038/jid.2008.302 1742:10.1038/jid.2008.198 1127:10.1128/JVI.02400-09 655:10.1128/JVI.00875-07 246:virus-like particles 146:Human polyomavirus 5 30:Virus classification 23:Human polyomavirus 5 3093:Post-polio syndrome 2729:Infectious diseases 2461:(Suppl 2): 217–20. 2174:1994Sci...266.1865C 2085:10.1093/jnci/djp139 1782:2011PLoSO...622468F 1115:Journal of Virology 1068:2008PNAS..10516272S 643:Journal of Virology 595:2008Sci...319.1096F 277:murine polyomavirus 228:Family tree of the 3226:Epstein–Barr virus 3196:Respiratory system 2833:Burkitt's lymphoma 1547:10.1002/cncr.22765 589:(5866): 1096–100. 541:Other associations 485:Merkel cell tumors 389:Burkitt's lymphoma 321:proteins, such as 267:, double-stranded 258: 250: 238: 3791:Alphapolyomavirus 3778: 3777: 3716:Taxon identifiers 3707: 3706: 3669: 3668: 3420: 3419: 3351:Influenza virus A 3268:Human coronavirus 3158: 3157: 3148:Herpes of the eye 2695: 2694: 2226:10.1002/path.2532 1987:10.1002/ijc.24790 1937:10.1002/ijc.24510 1883:(5866): 1049–50. 1413:(11): 2343–2354. 1204:"Addgene: MCV-HF" 1013:10.1002/jcp.29213 814:10.1002/ijc.24509 698:(14): 3929–3934. 397:ultraviolet light 311:Our Viruses - MCV 153: 152: 133:Alphapolyomavirus 3803: 3771: 3770: 3758: 3757: 3756: 3743: 3742: 3741: 3711: 3710: 3433: 3432: 3428:digestive system 3345:Orthomyxoviridae 3311:SARS coronavirus 3297:MERS coronavirus 3213: 3212: 3025:Orthomyxoviridae 2948: 2947: 2914:Immune disorders 2838:Hodgkin lymphoma 2814:Kaposi's sarcoma 2722: 2715: 2708: 2699: 2698: 2677:STL polyomavirus 2608: 2601: 2594: 2585: 2584: 2567: 2566: 2538: 2532: 2531: 2521: 2504:(4): 1049–1052. 2498:Oncology Letters 2492:(October 2013). 2485: 2479: 2478: 2450: 2444: 2443: 2414: 2408: 2407: 2397: 2387: 2372:Virology Journal 2363: 2357: 2356: 2348: 2342: 2341: 2339: 2337: 2326: 2320: 2319: 2317: 2316: 2301: 2295: 2294: 2284: 2252: 2246: 2245: 2208: 2202: 2201: 2168:(5192): 1865–9. 2153: 2147: 2146: 2136: 2119:(133): 133ra56. 2104: 2098: 2097: 2087: 2063: 2057: 2056: 2046: 2014: 2008: 2007: 1989: 1965: 1959: 1958: 1948: 1915: 1909: 1908: 1872: 1866: 1865: 1855: 1823: 1814: 1813: 1803: 1793: 1761: 1755: 1754: 1744: 1720: 1709: 1708: 1698: 1674: 1665: 1664: 1624: 1618: 1617: 1607: 1583: 1577: 1576: 1558: 1530: 1519: 1518: 1490: 1484: 1483: 1473: 1463: 1439: 1433: 1432: 1422: 1404: 1395: 1389: 1388: 1360: 1354: 1353: 1343: 1332:10.1172/JCI46323 1311: 1305: 1304: 1294: 1284: 1260: 1254: 1253: 1225: 1219: 1218: 1216: 1214: 1200: 1194: 1193: 1187: 1179: 1177: 1176: 1170: 1164:. Archived from 1163: 1155: 1149: 1148: 1138: 1106: 1100: 1099: 1089: 1079: 1047: 1036: 1035: 1025: 1015: 1006:(3): 1888–1894. 991: 985: 984: 974: 964: 940: 934: 933: 923: 891: 885: 884: 874: 842: 836: 835: 825: 793: 782: 781: 771: 761: 737: 728: 727: 717: 707: 683: 677: 676: 666: 649:(20): 11332–40. 634: 625: 624: 614: 574: 465:Patrick S. Moore 385:Kaposi's sarcoma 379:and people with 373:immunodeficiency 338:microRNA (miRNA) 319:tumor suppressor 38: 37: 19: 18: 16:Species of virus 3811: 3810: 3806: 3805: 3804: 3802: 3801: 3800: 3781: 3780: 3779: 3774: 3766: 3761: 3752: 3751: 3746: 3737: 3736: 3731: 3718: 3708: 3703: 3665: 3645: 3553: 3527:Gastroenteritis 3485: 3482:Gastroenteritis 3476: 3464:Cytomegalovirus 3427: 3416: 3384:Paramyxoviridae 3373:Avian influenza 3249: 3244:Cytomegalovirus 3208:viral pneumonia 3206: 3203:nasopharyngitis 3202: 3199: 3190: 3154: 3128:Cytomegalovirus 3113: 3067: 2955: 2942: 2935: 2908: 2775:Cervical cancer 2735: 2726: 2696: 2691: 2672:MW polyomavirus 2642:WU polyomavirus 2637:KI polyomavirus 2632:JC polyomavirus 2627:BK polyomavirus 2618: 2612: 2575: 2570: 2539: 2535: 2486: 2482: 2451: 2447: 2415: 2411: 2364: 2360: 2349: 2345: 2335: 2333: 2328: 2327: 2323: 2314: 2312: 2303: 2302: 2298: 2253: 2249: 2209: 2205: 2154: 2150: 2105: 2101: 2064: 2060: 2015: 2011: 1966: 1962: 1916: 1912: 1873: 1869: 1824: 1817: 1762: 1758: 1721: 1712: 1689:(13): 5009–13. 1683:Cancer Research 1675: 1668: 1639:(9305): 497–8. 1625: 1621: 1592:Transplantation 1584: 1580: 1531: 1522: 1491: 1487: 1454:(7): e1004974. 1440: 1436: 1402: 1396: 1392: 1361: 1357: 1312: 1308: 1275:(7): e1004974. 1261: 1257: 1226: 1222: 1212: 1210: 1208:www.addgene.com 1202: 1201: 1197: 1181: 1180: 1174: 1172: 1168: 1161: 1159:"Archived copy" 1157: 1156: 1152: 1121:(14): 7064–72. 1107: 1103: 1062:(42): 16272–7. 1048: 1039: 992: 988: 941: 937: 892: 888: 843: 839: 794: 785: 752:(3): e1000363. 738: 731: 684: 680: 635: 628: 575: 556: 552: 543: 527:cervical cancer 502: 458: 418: 351: 307:small T antigen 303:large T antigen 234:large T antigen 222: 149: 97:Papovaviricetes 32: 17: 12: 11: 5: 3809: 3799: 3798: 3793: 3776: 3775: 3773: 3772: 3759: 3744: 3728: 3726: 3720: 3719: 3705: 3704: 3702: 3701: 3700: 3699: 3687: 3679: 3677: 3671: 3670: 3667: 3666: 3664: 3663: 3655: 3653: 3647: 3646: 3644: 3643: 3631: 3619: 3607: 3595: 3588: 3582: 3581: 3569: 3563: 3561: 3555: 3554: 3552: 3551: 3544: 3537: 3530: 3518: 3512: 3511: 3510: 3509: 3497: 3491: 3489: 3478: 3477: 3475: 3474: 3473: 3472: 3460: 3459: 3458: 3445: 3443: 3430: 3422: 3421: 3418: 3417: 3415: 3414: 3407: 3400: 3399: 3398: 3378: 3377: 3376: 3375: 3336: 3335: 3334: 3333: 3321: 3320: 3319: 3307: 3306: 3305: 3293: 3292: 3291: 3259: 3257: 3251: 3250: 3248: 3247: 3240: 3239: 3238: 3221: 3219: 3210: 3192: 3191: 3189: 3188: 3187: 3186: 3181: 3168: 3166: 3164:Cardiovascular 3160: 3159: 3156: 3155: 3153: 3152: 3151: 3150: 3138: 3137: 3136: 3123: 3121: 3115: 3114: 3112: 3111: 3110: 3109: 3097: 3096: 3095: 3090: 3077: 3075: 3069: 3068: 3066: 3065: 3060: 3055: 3050: 3049: 3048: 3036: 3035: 3034: 3021: 3016: 3015: 3014: 3002: 3001: 3000: 2988: 2982: 2981: 2980: 2979: 2967: 2961: 2959: 2945: 2943:nervous system 2937: 2936: 2934: 2933: 2932: 2931: 2918: 2916: 2910: 2909: 2907: 2906: 2905: 2904: 2892: 2891: 2890: 2885: 2873: 2867: 2866: 2865: 2864: 2852: 2851: 2850: 2845: 2840: 2835: 2830: 2818: 2817: 2816: 2804: 2803: 2802: 2797: 2795:Vaginal cancer 2792: 2787: 2782: 2777: 2765: 2764: 2763: 2751: 2745: 2743: 2737: 2736: 2725: 2724: 2717: 2710: 2702: 2693: 2692: 2690: 2689: 2684: 2679: 2674: 2669: 2664: 2659: 2654: 2649: 2644: 2639: 2634: 2629: 2623: 2620: 2619: 2616:polyomaviruses 2611: 2610: 2603: 2596: 2588: 2582: 2581: 2574: 2573:External links 2571: 2569: 2568: 2533: 2480: 2445: 2409: 2358: 2343: 2321: 2296: 2247: 2203: 2148: 2099: 2078:(13): 938–45. 2058: 2029:(9): 1378–85. 2009: 1960: 1910: 1867: 1815: 1756: 1710: 1666: 1619: 1598:(10): 1396–7. 1578: 1520: 1485: 1448:PLOS Pathogens 1434: 1390: 1355: 1326:(9): 3623–34. 1306: 1269:PLOS Pathogens 1255: 1236:(1): 196–211. 1220: 1195: 1150: 1101: 1037: 1000:J Cell Physiol 986: 935: 886: 837: 783: 746:PLOS Pathogens 729: 678: 626: 553: 551: 548: 542: 539: 501: 498: 457: 454: 417: 414: 350: 347: 261:Polyomaviruses 230:polyomaviruses 221: 220:Classification 218: 151: 150: 143: 141: 137: 136: 129: 125: 124: 121:Polyomaviridae 117: 113: 112: 105: 101: 100: 93: 89: 88: 81: 77: 76: 69: 65: 64: 57: 50: 49: 44: 40: 39: 26: 25: 15: 9: 6: 4: 3: 2: 3808: 3797: 3794: 3792: 3789: 3788: 3786: 3769: 3764: 3760: 3755: 3749: 3745: 3740: 3734: 3730: 3729: 3727: 3725: 3721: 3717: 3712: 3698: 3695: 3694: 3693: 3692: 3688: 3686: 3685: 3681: 3680: 3678: 3676: 3672: 3662: 3661: 3657: 3656: 3654: 3652: 3648: 3641: 3637: 3636: 3632: 3629: 3625: 3624: 3620: 3617: 3613: 3612: 3608: 3605: 3601: 3600: 3596: 3594: 3593: 3589: 3587: 3584: 3583: 3579: 3575: 3574: 3570: 3568: 3565: 3564: 3562: 3560: 3556: 3550: 3549: 3545: 3543: 3542: 3538: 3536: 3535: 3531: 3528: 3524: 3523: 3519: 3517: 3514: 3513: 3508: 3505: 3504: 3503: 3502: 3498: 3496: 3493: 3492: 3490: 3488: 3483: 3479: 3471: 3468: 3467: 3466: 3465: 3461: 3457: 3454: 3453: 3452: 3451: 3447: 3446: 3444: 3442: 3438: 3434: 3431: 3429: 3423: 3413: 3412: 3408: 3406: 3405: 3401: 3397: 3396:Parainfluenza 3394: 3393: 3392: 3391: 3386: 3385: 3380: 3379: 3374: 3370: 3367: 3366: 3365: 3364: 3360: 3356: 3352: 3347: 3346: 3341: 3338: 3337: 3332: 3329: 3328: 3327: 3326: 3322: 3318: 3315: 3314: 3313: 3312: 3308: 3304: 3301: 3300: 3299: 3298: 3294: 3290: 3287: 3286: 3285: 3284: 3280: 3276: 3272: 3269: 3264: 3261: 3260: 3258: 3256: 3252: 3246: 3245: 3241: 3237: 3233: 3232:EBV infection 3230: 3229: 3228: 3227: 3223: 3222: 3220: 3218: 3214: 3211: 3209: 3204: 3197: 3193: 3185: 3182: 3180: 3177: 3176: 3175: 3174: 3170: 3169: 3167: 3165: 3161: 3149: 3146: 3145: 3144: 3143: 3139: 3135: 3132: 3131: 3130: 3129: 3125: 3124: 3122: 3120: 3116: 3108: 3105: 3104: 3103: 3102: 3098: 3094: 3091: 3089: 3088:Poliomyelitis 3086: 3085: 3084: 3083: 3079: 3078: 3076: 3074: 3070: 3064: 3061: 3059: 3056: 3054: 3051: 3047: 3044: 3043: 3042: 3041: 3037: 3033: 3030: 3029: 3027: 3026: 3022: 3020: 3017: 3013: 3010: 3009: 3008: 3007: 3003: 2999: 2996: 2995: 2994: 2993: 2989: 2987: 2984: 2983: 2978: 2975: 2974: 2973: 2972: 2968: 2966: 2963: 2962: 2960: 2958: 2953: 2949: 2946: 2944: 2938: 2930: 2927: 2926: 2925: 2924: 2920: 2919: 2917: 2915: 2911: 2903: 2900: 2899: 2898: 2897: 2893: 2889: 2886: 2884: 2881: 2880: 2879: 2878: 2874: 2872: 2869: 2868: 2863: 2860: 2859: 2858: 2857: 2853: 2849: 2846: 2844: 2841: 2839: 2836: 2834: 2831: 2829: 2826: 2825: 2824: 2823: 2819: 2815: 2812: 2811: 2810: 2809: 2805: 2801: 2798: 2796: 2793: 2791: 2790:Vulvar cancer 2788: 2786: 2785:Penile cancer 2783: 2781: 2778: 2776: 2773: 2772: 2771: 2770: 2766: 2762: 2759: 2758: 2757: 2756: 2752: 2750: 2747: 2746: 2744: 2742: 2738: 2734: 2730: 2723: 2718: 2716: 2711: 2709: 2704: 2703: 2700: 2688: 2685: 2683: 2680: 2678: 2675: 2673: 2670: 2668: 2665: 2663: 2660: 2658: 2655: 2653: 2650: 2648: 2645: 2643: 2640: 2638: 2635: 2633: 2630: 2628: 2625: 2624: 2621: 2617: 2609: 2604: 2602: 2597: 2595: 2590: 2589: 2586: 2580: 2577: 2576: 2564: 2560: 2556: 2552: 2548: 2544: 2537: 2529: 2525: 2520: 2515: 2511: 2507: 2503: 2499: 2495: 2491: 2484: 2476: 2472: 2468: 2464: 2460: 2456: 2455:Der Pathologe 2449: 2441: 2437: 2433: 2429: 2425: 2421: 2413: 2405: 2401: 2396: 2391: 2386: 2381: 2377: 2373: 2369: 2362: 2354: 2347: 2331: 2325: 2311:on 2008-04-22 2310: 2306: 2300: 2292: 2288: 2283: 2278: 2274: 2270: 2266: 2262: 2258: 2251: 2243: 2239: 2235: 2231: 2227: 2223: 2219: 2215: 2207: 2199: 2195: 2191: 2187: 2183: 2179: 2175: 2171: 2167: 2163: 2159: 2152: 2144: 2140: 2135: 2130: 2126: 2122: 2118: 2114: 2110: 2103: 2095: 2091: 2086: 2081: 2077: 2073: 2069: 2062: 2054: 2050: 2045: 2040: 2036: 2032: 2028: 2024: 2020: 2013: 2005: 2001: 1997: 1993: 1988: 1983: 1979: 1975: 1971: 1964: 1956: 1952: 1947: 1942: 1938: 1934: 1931:(6): 1243–9. 1930: 1926: 1922: 1914: 1906: 1902: 1898: 1894: 1890: 1886: 1882: 1878: 1871: 1863: 1859: 1854: 1849: 1845: 1841: 1838:(6): 509–15. 1837: 1833: 1829: 1822: 1820: 1811: 1807: 1802: 1797: 1792: 1787: 1783: 1779: 1776:(7): e22468. 1775: 1771: 1767: 1760: 1752: 1748: 1743: 1738: 1735:(1): 248–50. 1734: 1730: 1726: 1719: 1717: 1715: 1706: 1702: 1697: 1692: 1688: 1684: 1680: 1673: 1671: 1662: 1658: 1654: 1650: 1646: 1642: 1638: 1634: 1630: 1623: 1615: 1611: 1606: 1601: 1597: 1593: 1589: 1582: 1574: 1570: 1566: 1562: 1557: 1556:2027.42/56047 1552: 1548: 1544: 1540: 1536: 1529: 1527: 1525: 1516: 1512: 1508: 1504: 1501:(1): 107–10. 1500: 1496: 1489: 1481: 1477: 1472: 1467: 1462: 1457: 1453: 1449: 1445: 1438: 1430: 1426: 1421: 1416: 1412: 1408: 1401: 1394: 1386: 1382: 1378: 1374: 1370: 1366: 1359: 1351: 1347: 1342: 1337: 1333: 1329: 1325: 1321: 1317: 1310: 1302: 1298: 1293: 1288: 1283: 1278: 1274: 1270: 1266: 1259: 1251: 1247: 1243: 1239: 1235: 1231: 1224: 1209: 1205: 1199: 1191: 1185: 1171:on 2011-10-25 1167: 1160: 1154: 1146: 1142: 1137: 1132: 1128: 1124: 1120: 1116: 1112: 1105: 1097: 1093: 1088: 1083: 1078: 1073: 1069: 1065: 1061: 1057: 1053: 1046: 1044: 1042: 1033: 1029: 1024: 1023:11392/2409453 1019: 1014: 1009: 1005: 1001: 997: 990: 982: 978: 973: 968: 963: 958: 954: 950: 946: 939: 931: 927: 922: 917: 913: 909: 906:(3): 489–91. 905: 901: 897: 890: 882: 878: 873: 868: 864: 860: 856: 852: 848: 841: 833: 829: 824: 819: 815: 811: 808:(6): 1250–6. 807: 803: 799: 792: 790: 788: 779: 775: 770: 765: 760: 755: 751: 747: 743: 736: 734: 725: 721: 716: 715:11392/2378829 711: 706: 701: 697: 693: 689: 682: 674: 670: 665: 660: 656: 652: 648: 644: 640: 633: 631: 622: 618: 613: 608: 604: 600: 596: 592: 588: 584: 580: 573: 571: 569: 567: 565: 563: 561: 559: 554: 547: 538: 536: 532: 528: 524: 518: 514: 512: 508: 497: 494: 490: 486: 482: 478: 475:technique of 474: 470: 466: 462: 453: 450: 445: 441: 437: 435: 434:Southern blot 431: 426: 422: 413: 410: 404: 400: 398: 394: 390: 386: 382: 378: 374: 369: 367: 363: 359: 355: 346: 344: 339: 334: 332: 328: 324: 320: 316: 312: 308: 304: 300: 296: 291: 289: 284: 282: 278: 274: 270: 266: 265:non-enveloped 262: 254: 247: 242: 235: 231: 226: 217: 215: 210: 205: 203: 198: 196: 192: 188: 184: 180: 176: 173: 169: 165: 161: 157: 148: 147: 142: 139: 138: 135: 134: 130: 127: 126: 123: 122: 118: 115: 114: 111: 110: 109:Sepolyvirales 106: 103: 102: 99: 98: 94: 91: 90: 87: 86: 85:Cossaviricota 82: 79: 78: 75: 74: 70: 67: 66: 63: 62: 58: 55: 52: 51: 48: 45: 42: 41: 36: 31: 27: 24: 20: 3723: 3689: 3682: 3658: 3651:Pancreatitis 3633: 3621: 3609: 3597: 3590: 3571: 3546: 3539: 3532: 3520: 3499: 3462: 3448: 3409: 3402: 3388: 3382: 3349: 3343: 3323: 3309: 3295: 3266: 3242: 3224: 3179:Pericarditis 3171: 3140: 3126: 3099: 3080: 3038: 3023: 3004: 2990: 2969: 2952:Encephalitis 2921: 2894: 2875: 2855: 2854: 2820: 2806: 2767: 2753: 2646: 2549:(3): 341–6. 2546: 2542: 2536: 2501: 2497: 2483: 2458: 2454: 2448: 2426:(1): 37–41. 2423: 2419: 2412: 2375: 2371: 2361: 2346: 2334:. 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Index

Virus classification
Edit this classification
Virus
Monodnaviria
Shotokuvirae
Cossaviricota
Papovaviricetes
Sepolyvirales
Polyomaviridae
Alphapolyomavirus
Pittsburgh, Pennsylvania
metagenomic
next-generation sequencing
digital transcriptome subtraction
oncoviruses
Merkel cell carcinoma
skin cancer
peripheral blood mononuclear cells
antigen
oncoproteins
IARC

polyomaviruses
large T antigen

virus-like particles

Polyomaviruses
non-enveloped
DNA viruses

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