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Polyoma (Py) virus multiplies, at 34 and 38.5 C, in wild-type (WT-4) and in ts A1S9 mouse L cells, which are temperature sensitive for growth and for DNA replication (R. Sheinin, 1976; L. H. Thompson et al., 1970). De novo synthesis of double-stranded, fully covalently closed Py DNA has been shown to proceed by semiconservative replication in WT-4 and ts A1S9 cells at the permissive and nonpermissive temperatures. Cell DNA is made late during infection, by both cell types and at both temperatures. Semiconservative replication of cell DNA proceeds in Py-infected WT-4 cells incubated at 34 or at 38.5 C and in Py-infected ts A1S9 cells incubated at 34 C. In virus-infected ts A1S9 cells incubated at 38.5 C, cell DNA synthesis appears to proceed almost entirely by a process analogous to repair replication. The inability of ts A1S9 cells to produce large-molecular-weight chromosomal DNA strands, at 38.5 C, by the normal mechanism is not overcome by Py infection.

Polyoma and cell DNA synthesis in mouse L cells temperature sensitive for the replication of cell DNA