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XB-ART-23834
Nucleic Acids Res 1992 Apr 11;207:1457-62.
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DNA replication initiates at multiple sites on plasmid DNA in Xenopus egg extracts.

Mahbubani HM , Paull T , Elder JK , Blow JJ .


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Cell-free extracts of Xenopus eggs will replicate plasmid DNA molecules under normal cell cycle control. We have used the neutral/neutral 2-D gel technique to map the sites at which DNA replication initiates in this system. Three different plasmids were studied: one containing the Xenopus rDNA repeat, one containing single copy Xenopus genomic DNA, and another containing the yeast 2 microns replication origin. 2-D gel profiles show that many potential sites of initiation are present on each plasmid, and are randomly situated at the level of resolution of this technique (500-1000 bp). Despite the abundance of sites capable of supporting the initiation of replication, pulse-chase experiments suggest that only a single randomly situated initiation event occurs on each DNA molecule. Once initiation has taken place, conventional replication forks appear to move away from this site at a rate of about 10nt/second, similar to the rate observed in vivo.

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References [+] :
Bakken, Mapping of transcription initiation and termination signals on Xenopus laevis ribosomal DNA. 1982, Pubmed, Xenbase