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DNA was extracted from [3 H]thymidine-labeled Marek's disease virus (MDV) and purified by two cycles of CsCl gradient centrifugation in a fixed-angle rotor. The DNA was transcribed in vitro into32 P-labeled complementary RNA (cRNA). MDV cRNA did not hybridize with DNA from chicken embryo fibroblast cultures or from chicken spleen, but hybridized efficiently with DNA from MDV particles or MDV-infected cell cultures. Five Marek's disease tumors from different chickens and different organs (ovary, liver, testis) were all found to contain MDV DNA sequences. The relative amount of MDV DNA varied from tumor to tumor and was between 3 and 15 virus genome equivalents per cell. The content of virus DNA per cell in spleens from tumor-bearing chickens was much lower than in tumors from the same animals. MDV-infected cell cultures contained a large proportion (28-59%) of virus antigen-positive cells, as measured by immunofluorescence, but tumor cells were negative in this respect (&lt;0.02% positive cells). These data indicate that MDV is present in a provirus form in tumor cells.

Deoxyribonucleic Acid of Marek's Disease Virus in Virus-Induced Tumors