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The hamster papovavirus isolated from skin epithelioma can induce lymphomas and leukemias after subcutaneous inoculation into newborn hamsters. The lymphoma cells are virus free but contain large amounts of extrachromosomal hamster papovavirus DNA. We have cloned and partly sequenced some of these DNA molecules from independent tumors. These genomes displayed overlapping deletions consistently sharing a common end within the noncoding regulatory sequences; the other end was variable but always extended into the sequence coding for the N-terminal part of the viral capsid VP2. This unique in vivo interaction between a polyomavirus and its cellular host, the genesis of these variant molecules, and their role in the lymphoma formation are discussed.

Induction of lymphomas by the hamster papovavirus correlates with massive replication of nonrandomly deleted extrachromosomal viral genomes