title: Simian virus 40 large T-antigen function is required for induction of tetraploid DNA content during lytic infection.
abstract: Infection of quiescent CV-1 cells with simian virus 40 mutant tsA30 at 37 degrees C resulted in the induction of two rounds of cellular DNA synthesis in T-antigen-positive cells, as previously described for wild-type simian virus 40. Following infection with tsA30 at 40.5 degrees C, T-antigen-positive cells were induced into S phase and reached a diploid G2 DNA content; however, a second S phase was not initiated. The failure of tsA30-infected CV-1 cells to enter tetraploid S phase at 40.5 degrees C identifies a T-antigen function, distinct from T-antigen functions responsible for stimulation of cell DNA synthesis, which is required for initiation of a second round of DNA synthesis without mitosis.
authors.affiliation: Department of Microbiology, Immunology and Molecular Genetics, Albany Medical College, New York 12208.
authors.forename: T D
authors.initials: TD
authors.lastname: Friedrich
authors.forename: J
authors.initials: J
authors.lastname: Laffin
authors.forename: J M
authors.initials: JM
authors.lastname: Lehman
mesh_terms: D000952:Antigens, Polyomavirus Transforming / Q000235:genetics / Q000502:physiology*; D002460:Cell Line; D004247:DNA / Q000096:biosynthesis*; D007700:Kinetics; D009154:Mutation; D011123:Polyploidy; D016196:S Phase; D013539:Simian virus 40 / Q000235:genetics / Q000502:physiology*; D013696:Temperature
chemical_list: D000952:Antigens, Polyomavirus Transforming; D004247:DNA