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pubmed-article:17081992pubmed:abstractTextCorrect regulation of the replication licensing system ensures that no DNA is rereplicated in a single cell cycle. When the licensing protein Cdt1 is overexpressed in G2 phase of the cell cycle, replication origins are relicensed and the DNA is rereplicated. At the same time, checkpoint pathways are activated that block further cell cycle progression. We have studied the consequence of deregulating the licensing system by adding recombinant Cdt1 to Xenopus egg extracts. We show that Cdt1 induces checkpoint activation and the appearance of small fragments of double-stranded DNA. DNA fragmentation and strong checkpoint activation are dependent on uncontrolled rereplication and do not occur after a single coordinated round of rereplication. The DNA fragments are composed exclusively of rereplicated DNA. The unusual characteristics of these fragments suggest that they result from head-to-tail collision (rear ending) of replication forks chasing one another along the same DNA template.lld:pubmed
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pubmed-article:17081992pubmed:authorpubmed-author:BlowJ...lld:pubmed
pubmed-article:17081992pubmed:authorpubmed-author:LiAnatoliyAlld:pubmed
pubmed-article:17081992pubmed:authorpubmed-author:DavidsonIain...lld:pubmed
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pubmed-article:17081992pubmed:pagination433-43lld:pubmed
pubmed-article:17081992pubmed:dateRevised2010-6-30lld:pubmed
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pubmed-article:17081992pubmed:articleTitleDeregulated replication licensing causes DNA fragmentation consistent with head-to-tail fork collision.lld:pubmed
pubmed-article:17081992pubmed:affiliationSchool of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom.lld:pubmed
pubmed-article:17081992pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17081992pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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