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Patterns of polyomavirus replication and spread have been studied following inoculation of virus into newborn mice. Levels of virus replication in different tissues were followed in situ by using whole mouse section blots and immunoperoxidase staining for the major capsid protein VP1, as well as by tissue extraction and direct quantitation of viral DNA and infectious virus. Patterns of replication and spread were compared between the "high tumor" strain (inducing a high incidence of tumors) PTA and and the "low tumor" strain (inducing a low incidence of tumors) RA, following different routes of inoculation. The ability to induce a high tumor profile correlated with the ability to establish disseminated productive infection, with the kidney as a major site of amplification. Furthermore, results with PTA-RA recombinant viruses and site-directed mutants showed that the VP1 specificity of PTA, demonstrated earlier to be a critical determinant for induction of a high tumor profile (R. Freund, A. Calderone, C. J. Dawe, and T. L. Benjamin, J. Virol. 65:335-341, 1991), is also critical for amplification in the kidney and for establishment of disseminated infections.

Polyomavirus replication in mice: influences of VP1 type and route of inoculation