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- W2127967211 abstract "Replication in eukaryotes is bidirectional and semi-discontinuous. This asymmetry provides the basis for mapping the origin of bidirectional replication (OBR), which is the transition point from discontinuous to continuous synthesis. The regions of each DNA strand complementary to the leading strand or lagging strand can be measured by the methods of imbalanced DNA synthesis or Okazaki fragment distribution, respectively. The resolution of both of these hybridization-based procedures is a few hundred base pairs. Nucleotide resolution was previously achieved for viral origins by mapping the initiation sites of Okazaki fragments on sequencing gels. To overcome the background caused by nicked DNA, all DNA ends were phosphorylated, RNA primers were removed from the Okazaki fragments by NaOH hydrolysis, and the hydroxyl ends thus created were phosphorylated with32P. Unfortunately, this method was not sensitive enough to map eukaryotic cellular origins. A new method, replication initiation point (RIP) mapping, that is 1000-fold more sensitive and has been applied to yeast ARS1 where the OBR is mapped to an 18-bp region from within element B1 toward B2 is described here. RIP mapping utilizes Vent (exo-) polymerase to extend from a labeled primer to the DNA/RNA junctions of nascent strand template in an asynchronous population of replicating molecules. The DNA is digested with λ-exonuclease prior to primer extension to remove nicked contaminating DNA." @default.
- W2127967211 created "2016-06-24" @default.
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- W2127967211 date "1997-11-01" @default.
- W2127967211 modified "2023-10-11" @default.
- W2127967211 title "Replication Initiation Point Mapping" @default.
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- W2127967211 doi "https://doi.org/10.1006/meth.1997.0526" @default.
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