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• W2028111503 startingPage "1019" @default.
• W2028111503 abstract "Background: The eukaryotic genome is divided into distinct replication timing domains, which are activated during S phase in a strictly conserved order. Cellular differentiation can alter replication timing in some loci, but recent experiments yielded conflicting data regarding the relationship between gene expression and replication timing. The genetic and epigenetic determinants of replication timing in mammalian cells have yet to be elucidated.Results: We developed a mammalian experimental system in which the timing of DNA replication can be altered in a controlled manner. This system utilizes sequences from the human β-globin locus that exhibit orientation-dependent transcriptional silencing when inserted into the murine genome. We found that before insertion, the murine target site replicated late during S phase. After insertion, replication timing depended on the orientation of the transgene. In a transcription-permissive orientation, the transgene and flanking sequences replicated early. In the reverse (silencing-prone) orientation, these sequences replicated late. Early replication correlated with histone modifications of the transgene chromatin but could be observed in the absence of the β-globin promoter. Importantly, the replication timing switch did not require a replication origin within the transgene.Conclusions: Transgene insertions into mammalian heterochromatin can alter the timing of DNA replication at the insertion site. This differentiation-independent replication timing switch did not necessitate insertion of an active promoter or a replication origin. These observations suggest that the timing of DNA replication can be manipulated by changes in DNA sequence, but that the determinants of replication timing are distinct from the sequences that specify replication initiation sites." @default.
• W2028111503 created "2016-06-24" @default.
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• W2028111503 date "2003-06-01" @default.
• W2028111503 modified "2023-10-07" @default.
• W2028111503 title "Dynamic Alterations of Replication Timing in Mammalian Cells" @default.
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• W2028111503 doi "https://doi.org/10.1016/s0960-9822(03)00382-8" @default.
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• W2028111503 hasPublicationYear "2003" @default.
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