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. 1990 Aug;10(8):4345–4355. doi: 10.1128/mcb.10.8.4345

Position effects on the timing of replication of chromosomally integrated simian virus 40 molecules in Chinese hamster cells.

D M Gilbert 1, S N Cohen 1
PMCID: PMC360984  PMID: 2164638

Abstract

Simian virus 40 (SV40) DNA molecules chromosomally integrated at different sites in three Chinese hamster lung fibroblast lines replicated during the middle portion of S phase but not precisely at the same time in all three cell lines. The time of replication was unrelated to the presence of T antigen or to its relative activity in promoting SV40 replication. SV40 sequences and chromosomal DNA sequences adjacent to the SV40 insert in one cell line expressing a temperature-sensitive T antigen showed a T-antigen-independent difference in replication timing from the homologous, allelic locus not linked to SV40. Our results indicate that the timing of replication of these integrated SV40 molecules is dependent upon the site of integration and is not determined by the level of T antigen replication-promoting activity.

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