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- W2009761005 abstract "The neutral/neutral and neutral/alkaline two-dimensional gel electrophoretic techniques are sensitive physical mapping methods that have been used successfully to identify replication initiation sites in genomes of widely varying complexity. We present detailed methodology for the preparation of replication intermediates from mammalian cells and their analysis by both neutral/neutral and neutral/alkaline two-dimensional gel approaches. The methods described allow characterization of the replication pattern of single-copy loci, even in mammalian cells. When applied to metazoans, initiation is found to occur at multiple sites scattered throughout zones that can be as long as 50 kb, with some subregions being preferred. Although these observations do not rule out the possibility of genetically defined replicators, they offer the alternative or additional possibility that chromosomal context may play an important role in defining replication initiation sites in complex genomes. We discuss novel recombination strategies that can be used to test for the presence of sequence elements critical for origin function if the origin lies in the vicinity of a selectable gene. Application of this strategy to the DHFR locus shows that loss of sequences more than 25 kb from the local initiation zone can markedly affect origin activity in the zone." @default.
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- W2009761005 date "1999-07-01" @default.
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- W2009761005 title "Physical and Genetic Mapping of Mammalian Replication Origins" @default.
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- W2009761005 doi "https://doi.org/10.1006/meth.1999.0800" @default.
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