Xenotropic murine leukemia virus–related virus

Xenotropic murine leukemia virus-related virus
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Pararnavirae
Phylum: Artverviricota
Class: Revtraviricetes
Order: Ortervirales
Family: Retroviridae
Genus: Gammaretrovirus
Virus:
Xenotropic murine leukemia virus-related virus

Xenotropic murine leukemia virus–related virus (XMRV) is a retrovirus which was first described in 2006 as an apparently novel human pathogen found in tissue samples from men with prostate cancer.[1][2] Initial reports erroneously linked the virus to prostate cancer and later to chronic fatigue syndrome (CFS), leading to considerable interest in the scientific and patient communities, investigation of XMRV as a potential cause of multiple medical conditions, and public-health concerns about the safety of the donated blood supply.[3][4][5]

Xenotropic viruses replicate or reproduce in cells other than those of the host species.[6] Murine refers to the rodent family Muridae, which includes common household rats and mice.[7]

Subsequent research established that XMRV was in fact a laboratory contaminant, rather than a novel pathogen,[4][5] and had been generated unintentionally in the laboratory through genetic recombination between two mouse retroviruses during propagation of a prostate-cancer cell line in the mid-1990s.[3][4][5] These findings raised serious questions concerning the findings of XMRV-related studies which purported to find connections between XMRV and human diseases.[8] As of 2022, there is no evidence that XMRV infects humans, nor that XMRV is associated with or causes any human disease.[9][10][11]

Classification and genome

XMRV is a murine leukemia virus (MLV) that formed through the recombination of the genomes of two parent MLVs known as preXMRV-1 and preXMRV-2.[12] MLVs belong to the virus family Retroviridae and the genus gammaretrovirus and have a single-stranded RNA genome that replicates through a DNA intermediate. The name XMRV was given because the discoverers of the virus initially thought that it was a novel potential human pathogen that was related to but distinct from MLVs. The XMRV particle is approximately spherical and 80 to 100 nm in diameter.[citation needed] Several XMRV genomic sequences have been published to date. These sequences are almost identical, an unusual finding[13] as retroviruses replicate their genomes with relatively low fidelity, leading to divergent viral sequences in a single host organism.[13][14] In 2010 the results of phylogenetic analyses of XMRV and related murine retroviruses led a group of researchers to conclude that XMRV "might not be a genuine human pathogen".[15][8] Xenotropic viruses (xenos Gr. foreign; tropos Gr. turning) were initially discovered in the New Zealand Black (NZB) mouse and later found to be present in many other mouse strains including wild mice.[16][17]

Discovery

XMRV was discovered in the laboratories of Joseph DeRisi at the University of California, San Francisco, and Robert Silverman and Eric Klein of the Cleveland Clinic. Silverman had previously cloned and investigated the enzyme ribonuclease L (RNase L), part of the cell's natural defense against viruses. When activated, RNase L degrades cellular and viral RNA to halt viral replication. In 2002, the "hereditary prostate cancer 1" locus (HPC1) was mapped to the RNase L gene, implicating it in the development of prostate cancer.[18] The cancer-associated "R462Q" mutation results in a glutamine instead of an arginine at position 462 of the RNase L enzyme, reducing its catalytic activity. A man with two copies of this mutation has twice the risk of prostate cancer; one copy raises the risk by 50%.[19] Klein and Silverman hypothesized that "the putative linkage of RNase L alterations to HPC might reflect enhanced susceptibility to a viral agent" and conducted a viral screen of prostate cancer samples,[19] leading to the discovery of XMRV.

Disease association studies

Prostate cancer

Detection of XMRV was reported in several articles.[2][20] However, subsequent studies and retractions cast doubt on these findings.[21][22]

Other conditions

In one study, XMRV was detected in a small percentage of patients with weakened immune systems,[23] but other studies found no evidence of XMRV in immunosuppression.[24][25]

Controversy and origins

Concerns arose as multiple subsequent studies failed to replicate the positive findings of XMRV in the blood of patients with CFS, prostate cancer, and other illnesses.[26][8][27][28]

Separate from these concerns, alarms were raised over the possibility that XMRV might be transmissible by blood transfusion since the virus was recovered from lymphocytes (white blood cells).[29] XMRV is closely related to several known xenotropic mouse viruses which can recognize and enter cells of non-rodent species (including humans) by means of the cell surface xenotropic and polytropic retrovirus receptor 1 (XPR1).[30] As a result, the AABB (formerly the American Association of Blood Banks) established a task force to determine the prevalence of XMRV in the United States' blood donation supply and the suitability of different detection methods.[29]

In September 2011, the Scientific Research Working Group (SRWG) arm of the AABB task force released its findings that current assays could not reliably identify XMRV in human blood samples which had previously tested as XMRV/MLV positive; the only two labs which reported positive findings of XMRV in samples which were previously reported as positive (the WPI and NCI/Ruscetti labs) also reported positive findings in samples which were known XMRV negative.[31]

Multiple contemporary studies concluded that XMRV was most likely a result of incidental recombination of mouse viruses during prostate cancer research in the 1990s. Positive findings of the virus were likely due to contamination rather than true presence of the virus in humans.[8][3][5][4] A subsequent analysis also found that the primers used to detect and replicate traces of XMRV in PCR testing are, in fact, neither selective nor specific to XMRV and will actually react to various non-XMRV sequences naturally found in mammalian genomes.[32] In the meantime, multiple other studies also failed to find any link between XMRV and CFS or prostate cancer.[33][34][35] As a result, many of the key publications which did claim an association were voluntarily retracted.[2][36][21] This included the initial study which had linked XMRV to CFS, which was retracted at Silverman's request; one of the co-authors, Judy Mikovits, was also accused of scientific misconduct.[37][38][39]

References

  1. ^ "XMRV (Xenotropic Murine Leukemia Virus-related Virus) | CDC". Centers for Disease Control. Archived from the original on 18 April 2018. Retrieved 2018-04-17.
  2. ^ a b c Urisman, A.; Molinaro, R.J.; Fischer, N.; Plummer, S.J.; Casey, G.; Klein, E.A.; Malathi, K.; Magi-Galluzzi, C.; Tubbs, R. R.; Ganem, D. (2006). "Identification of a novel Gammaretrovirus in prostate tumors of patients homozygous for R462Q RNASEL variant". PLOS Pathog. 2 (3): e25. doi:10.1371/journal.ppat.0020025. PMC 1434790. PMID 16609730. (Retracted, see doi:10.1371/annotation/7e2efc01-2e9b-4e9b-aef0-87ab0e4e4732, PMID 23028303,  Retraction Watch)
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French pop-rock singer and songwriter (born 1948) This biography of a living person needs additional citations for verification. Please help by adding reliable sources. Contentious material about living persons that is unsourced or poorly sourced must be removed immediately from the article and its talk page, especially if potentially libelous.Find sources: Hubert-Félix Thiéfaine – news · newspapers · books · scholar · JSTOR (July 2009) (Learn how an...

 

 

Sejarah Ming

Mingshi beralih ke halaman ini, yang bukan mengenai Ming Shilu. Sejarah Ming Hanzi tradisional: 明史 Hanzi sederhana: 明史 Alih aksara Mandarin - Hanyu Pinyin: Míng Shǐ Min Nan - Romanisasi POJ: Bêng-sú Sejarah Ming (Míng Shǐ) adalah salah satu dari karya-karya sejarah Tiongkok resmi yang dikenal sebagai Dua Puluh Empat Catatan Sejarah Tiongkok. Buku tersebut terdiri dari 332 volume dan menyoroti sejarah Dinasti Ming dari 1368 sampai 1644. Karya tersebut ditulis oleh sejumlah pejaba...

Federal Assembly (Russia)

Legislature of the Russian FederationRussian parliament redirects here. For other uses, see Russian parliament (disambiguation).Federal Assembly Федеральное собраниеFederalnoye sobraniyeTypeTypeBicameral Houses• Federation Council• State DumaHistoryFounded12 December 1993; 30 years ago (1993-12-12)Preceded bySupreme Soviet of RussiaConstitutional Conference of RussiaLeadershipChairwoman of the Federation CouncilValentina Matviyenko, United Rus...

 

 

實地調研

水生生物学家在德国一条小溪旁边进行实地考察，采集底棲动物样本 1993年，在漢他病毒實地研究期间，美国疾病控制与预防中心一位科学家从捕获的啮齿目动物身上采集样本 實地調研（field research），又稱實地研究（field study），為對於描述原始資料蒐集的概括術語，其所應用的領域包括民俗学、考古學、生物學、生態學、環境科學、地理學、地質學、地形學、地球物理學�...