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Science 23 May 2003:
Vol. 300. no. 5623, pp. 1300 - 1303
DOI: 10.1126/science.1083964
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Reports

Uncoupling of Leading- and Lagging-Strand DNA Replication During Lesion Bypass in Vivo

Vincent Pagès and Robert P. Fuchs*

Numerous agents attack DNA, forming lesions that impair normal replication. Specialized DNA polymerases transiently replace the replicative polymerase and copy past lesions, thus generating mutations, the major initiating cause of cancer. We monitored, in Escherichia coli, the kinetics of replication of both strands of DNA molecules containing a single replication block in either the leading or lagging strand. Despite a block in the leading strand, lagging-strand synthesis proceeded further, implying transient uncoupling of concurrent strand synthesis. Replication through the lesion requires specialized DNA polymerases and is achieved with similar kinetics and efficiencies in both strands.

Cancérogenèse et Mutagenèse Moléculaire et Structurale, Unité Propre de Recherche 9003; Centre National de la Recherche Scientifique, Ecole Supérieure de Biotechnologie Boulevard S. Brant, 67400 Strasbourg, France.

* To whom correspondence should be addressed. E-mail: fuchs{at}esbs.u-strasbg.fr

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