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- W2053970457 abstract "A new method for determining the timing of DNA replication in specific regions of the mammalian genome without the use of DNA density labeling and DNA density centrifugation is described. The method is based on determination of average relative DNA copy numbers in specific genomic regions as cells progress through S phase, and time of replication for a specific region is described in terms of the cell's DNA content when the region is replicated. DNA is isolated from synchronized populations of G1 and S phase cells, it is slot-blotted at the same DNA concentration(s) for each population, and it is hybridized with 32P-labeled DNA probes that are specific to the regions of interest. Quantitation of the slot blot autoradiograms and flow cytometric analysis allows determination of (a) average relative DNA copy numbers for the regions of interest in synchronized cell populations, and (b) the average total DNA content in each population of synchronized cells. This information and the flow cytometry histograms are then used to calculate the cellular DNA content at which each region of interest is replicated. The results have a precision of less than or equal to +/- 10% of S phase for Chinese hamster (line CHO) rhodopsin, metallothionein II, the 5'-end of dihydrofolate reductase, the telomeric repeated sequence, pHuR-093 (also located near the centromeres in CHO chromosomes), and the c-Ki-ras family." @default.
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- W2053970457 date "1990-05-01" @default.
- W2053970457 modified "2023-09-23" @default.
- W2053970457 title "DNA contents of replication without DNA density labeling" @default.
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- W2053970457 doi "https://doi.org/10.1016/0003-2697(90)90409-3" @default.
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