While waiting for sources to get back to me, I thought I’d post preliminary comments from Tufts University’s Dr. John Coffin. Coffin co-authored two of the four studies in Retrovirology on Monday that postulated that XMRV may be merely contamination from mouse DNA, as opposed to a new human retrovirus that has jumped species from mouse to man and has been found in patients with ME/CFS and prostate cancer.
CFS Central: In your papers, you write that you obtained samples of WPI's [Whittemore Peterson Institute] XMRV positive lymphoblastoid cells. Your papers, however, don't discuss testing these cells for evidence of mouse DNA…. Did you test these cells for evidence of mouse DNA? If so, did you find contamination? If you did not test the 1282 cells for contamination, why did you decide not to test them?
JOHN COFFIN: Not to my knowledge, since there was no particular reason to do so. We have tested [prostate cancer] 22Rv1 cells, and some other human cell lines, with negative results.
CFS Central: Were the cell lines you tested that had no mouse contamination (the 22Rv1 cells, for instance) XMRV positive or XMRV negative?
JOHN COFFIN: 22Rv1 is XMRV positive. It's the standard positive control.
CFS Central: Have you tested or do you have plans to test XMRV positive patient samples from WPI or MLV [-related virus] positive patient samples from Drs. Alter and Lo?
JOHN COFFIN: We have no plans to do so at Tufts. However, the group I work with in the NCI [National Cancer Institute] is collaborating with the Blood Working Group, and we will look at samples from both the WPI patients as well as the same patients that Lo and Alter studied. [Lo and Alter are the principal investigators of the NIH/FDA/Harvard study published in August, which found XMRV-related retroviruses in the majority of ME/CFS patients and 7 percent of controls.]
CFS CENTRAL: If you’ve already tested these retroviral positive samples from WPI and Alter/Lo, did you find mouse DNA contamination?
JOHN COFFIN: We haven't done that yet.
CFS CENTRAL: If Tufts hasn’t tested these samples and has no plans to, wouldn’t that be the definitive way to determine whether there is mouse DNA contamination?
JOHN COFFIN: We will test at NCI using the same assay.