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Animal: DNA Viruses |
Department of Virology, Haartman Institute, PL 21 (Haartmaninkatu 3), FIN-00014 University of Helsinki, Helsinki, Finland1
Central Military Hospital2, Dextra Medical Centre3 and Departments of Anatomy, Oral Medicine and Rheumatology, University of Helsinki4, Helsinki, Finland
Author for correspondence: Klaus Hedman. Fax +358 9 1912 6491. e-mail klaus.hedman{at}helsinki.fi
Primary infection by human parvovirus B19 is often accompanied by arthropathy of varying duration, of which the most severe cases can be indistinguishable from rheumatoid arthritis (RA). While this might seem to imply a role in RA pathogenesis, recent studies have verified long-term persistence of B19 DNA in synovial tissue not only in patients with rheumatoid or juvenile arthritis, but also in immunocompetent, non-arthritic individuals with a history of prior B19 infection. However, the latter data are based on PCR amplification of short segments of DNA, with little sequence information. We determined the nucleotide sequence and examined the integrity of the protein-coding regions of B19 genomes persisting in synovial tissue and compared the results with data from synovial tissues of recently infected patients. In synovium of both previously and recently infected subjects, the viral coding regions were found to be present in an apparently continuous, intact DNA molecule. Comparison with sequences reported from blood or bone marrow showed that the synoviotropism or persistence of the B19 virus DNA was not due to exceptional mutations or particular genotype variants. The synovial retention of full-length viral genomes may represent a physiological process functioning in long-term storage of foreign macromolecules in this tissue.
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