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JC virus DNA was extracted from urine-derived cells of bone marrow and renal transplant patients and cloned directly into the plasmid vector pBR322. These clones represent the first JC virus isolates obtained directly from individuals that did not have progressive multifocal leukoencephalopathy (PML). Three of the clones appeared to be identical to the prototype JC virus Mad 1, and the fourth clone was identical to the type II JC virus variant Mad8-Br. Importantly, the same JC virus strains have been identified both in the urine of non-PML patients and in the brain tissue of PML patients. These results indicate that different organs may be infected with the same JC virus subtype and implies that an adaptation process involving the alteration of viral regulatory signals is not required in the pathogenesis of PML. Furthermore, both a type I and a type II variant were obtained from the same patient, suggesting that an individual may be infected with more than one strain of JC virus at a given time.

Direct isolation and characterization of JC virus from urine samples of renal and bone marrow transplant patients