title: Asynchronous bidirectional replication of polyoma virus DNA.
abstract: The structure of polyoma virus replicative intermediates isolated from infected 3T6 cells was analyzed by two-dimensional agarose gel electrophoresis (Sundin and Varshavsky, Cell 21:103-114, 1980) and quantitative electron microscopy (Krauss and Benbow, J. Virol. 38:815-825, 1981). DNA replication was initiated at a single site (ori) in essentially all of the replicative intermediates. Most of the early replicative intermediates were formed by unidirectional synthesis in the direction of early transcription. Most mid- and late replicative intermediates contained two replication forks which had traveled unequal distances from the origin. Asynchronous initiation of the two growing forks was postulated to account for these observations.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D004261:DNA Replication; D004279:DNA, Viral / Q000096:biosynthesis*; D004587:Electrophoresis, Agar Gel; D051379:Mice; D008854:Microscopy, Electron; D011120:Polyomavirus / Q000235:genetics*; D013539:Simian virus 40 / Q000235:genetics; D014779:Virus Replication
chemical_list: D004279:DNA, Viral