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Murine gammaretrovirus group G3 was not found in Swedish patients with myalgic encephalomyelitis/chronic fatigue syndrome and fibromyalgia.
PLoS One. 2011;6(10):e24602
Publication Type
Amal Elfaitouri
Xingwu Shao
Johan Mattsson Ulfstedt
Shaman Muradrasoli
Agnes Bölin Wiener
Sultan Golbob
Christina Ohrmalm
Michael Matousek
Olof Zachrisson
Carl-Gerhard Gottfries
Jonas Blomberg
Author Affiliation
Section of Clinical Virology, Department of Medical Sciences, University of Uppsala, Uppsala, Sweden.
PLoS One. 2011;6(10):e24602
Publication Type
Base Sequence
Computational Biology
Fatigue Syndrome, Chronic - complications - virology
Fibromyalgia - complications - virology
Gammaretrovirus - genetics - isolation & purification
Gene Products, env - genetics
Gene Products, gag - genetics
Genome - genetics
Histones - metabolism
Mice, Inbred C57BL
Molecular Sequence Data
Nucleic Acids - genetics
Polymerase Chain Reaction
Proviruses - genetics - isolation & purification
Real-Time Polymerase Chain Reaction
Recombination, Genetic - genetics
Sensitivity and specificity
Sequence Alignment
The recent report of gammaretroviruses of probable murine origin in humans, called xenotropic murine retrovirus related virus (XMRV) and human murine leukemia virus related virus (HMRV), necessitated a bioinformatic search for this virus in genomes of the mouse and other vertebrates, and by PCR in humans.
Three major groups of murine endogenous gammaretroviruses were identified. The third group encompassed both exogenous and endogenous Murine Leukemia Viruses (MLVs), and most XMRV/HMRV sequences reported from patients suffering from myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). Two sensitive real-time PCRs for this group were developed. The predicted and observed amplification range for these and three published XMRV/HMRV PCRs demonstrated conspicuous differences between some of them, partly explainable by a recombinatorial origin of XMRV. Three reverse transcription real-time PCRs (RTQPCRs), directed against conserved and not overlapping stretches of env, gag and integrase (INT) sequences of XMRV/HMRV were used on human samples. White blood cells from 78 patients suffering from ME/CFS, of which 30 patients also fulfilled the diagnostic criteria for fibromyalgia (ME/CFS/FM) and in 7 patients with fibromyalgia (FM) only, all from the Gothenburg area of Sweden. As controls we analyzed 168 sera from Uppsala blood donors. We controlled for presence and amplifiability of nucleic acid and for mouse DNA contamination. To score as positive, a sample had to react with several of the XMRV/HMRV PCRs. None of the samples gave PCR reactions which fulfilled the positivity criteria.
XMRV/HMRV like proviruses occur in the third murine gammaretrovirus group, characterized here. PCRs developed by us, and others, approximately cover this group, except for the INT RTQPCR, which is rather strictly XMRV specific. Using such PCRs, XMRV/HMRV could not be detected in PBMC and plasma samples from Swedish patients suffering from ME/CFS/FM, and in sera from Swedish blood donors.
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PubMed ID
22022360 View in PubMed
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