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. 1994 Nov;14(11):7394–7403. doi: 10.1128/mcb.14.11.7394

Mapping an initiation region of DNA replication at a single-copy chromosomal locus in Drosophila melanogaster cells by two-dimensional gel methods and PCR-mediated nascent-strand analysis: multiple replication origins in a broad zone.

T Shinomiya 1, S Ina 1
PMCID: PMC359274  PMID: 7935453

Abstract

We have mapped an initiation region of DNA replication at a single-copy chromosomal locus in exponentially proliferating Drosophila tissue culture cells, using two-dimensional (2D) gel replicon mapping methods and PCR-mediated analysis of nascent strands. The initiation region was first localized downstream of the DNA polymerase alpha gene by determining direction of replication forks with the neutral/alkaline 2D gel method. Distribution of replication origins in the initiation region was further analyzed by using two types of 2D gel methods (neutral/neutral and neutral/alkaline) and PCR-mediated nascent-strand analysis. Results obtained by three independent methods were essentially consistent with each other and indicated that multiple replication origins are distributed in a broad zone of approximately 10 kb. The nucleotide sequence of an approximately 20-kb region that encompasses the initiation region was determined and searched for sequence elements potentially related to function of replication origins.

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Selected References

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