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EMBO J. 1987 Jul;6(7):2003-10.

Periodic DNA synthesis in cell-free extracts of Xenopus eggs.

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Department of Genetics and Developmental Biology, School of Biological Sciences, University of Sussex, Falmer, Brighton, UK.


Cell-free extracts prepared from unfertilized eggs of Xenopus laevis support DNA synthesis on sperm pronuclei. Continuous labelling studies using [3H]dCTP and pulse labelling studies using [32P]dCTP demonstrate that synthesis occurs in short bursts of 40 min, which are punctuated by periods of 20-40 min during which no synthesis occurs. Density substitution experiments using bromodeoxyuridine demonstrate that this synthesis involves the initiation of replication and reveals that re-initiation events can occur following multiple bursts of replication. The periodic properties of these extracts are sensitive to protein synthesis inhibitors.

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