A multicenter blinded analysis indicates no association between chronic fatigue syndrome/myalgic encephalomyelitis and either xenotropic murine leukemia virus-related virus or polytropic murine leukemia virus.
Alter, H.J., Mikovits, J.A., Switzer, W.M., Ruscetti, F.W., Lo, S.C., Klimas, N., Komaroff, A.L., Montoya, J.G., Bateman, L., Levine, S., Peterson, D., Levin, B., Hanson, M.R., Genfi, A., Bhat, M., Zheng, H., Wang, R., Li, B., Hung, G.C., Lee, L.L., Sameroff, S., Heneine, W., Coffin, J., Hornig, M. and Lipkin, W.I.
Notes: In this report, the original investigators who found XMRV and pMLV (polytropic murine leukemia virus) in blood of subjects with Chronic Fatigue Syndrome (CFS) report that this association is not confirmed in a blinded analysis of samples from rigorously characterized subjects.
The CDC performed nucleic acid testing assays. Plasma was centrifuged and RNA isolated from the pellet. Quantitative real-time RT-PCR assays (qRT-PCR) for generic pMLV/XMRV pro (protease) and gag detection were performed on RNA extracts, using the AccessQuick™ RT-PCR System and an AgPath one-step RT-PCR kit.
ArrayScript RT and AmpliTaq Gold DNA polymerase were used for cDNA synthesis and amplification in the pro and gag qRT-PCR assays, respectively. A third PCR was done using the primers XPOLOF and XPOLOR, followed by a nested PCR with the primers XPOLIF and XPOLIR for the generic detection of MLV/XMRV 216-bp pol sequences. For this reaction, cDNA synthesis and amplification of RNA was done using Promega AMV Reverse Transcriptase and a RobustI RT-PCR kit. Each PCR experiment included 20 water-only reactions to control for contamination. (4300)
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