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Science 14 February 1997:
Vol. 275. no. 5302, pp. 993 - 995
DOI: 10.1126/science.275.5302.993
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Reports

Regulation of Replicon Size in Xenopus Egg Extracts

Johannes Walter and John W. Newport *

Once a specific number of cells have been produced in the early Xenopus laevis embryo, replicon size during the S phase of the cell cycle increases. Here, it is reported that similar increase in replicon size occurred when the concentration of nuclei in replication-competent Xenopus egg extracts exceeded a critical threshold. In this system, the origin recognition complex (ORC) did not become stoichiometrically limiting for initiation, and similar amounts of this complex bound to chromatin regardless of replicon size. These data suggest that in early development, an unidentified factor controls how many preformed ORC-DNA complexes initiate DNA replication.

Department of Biology, University of California, San Diego, La Jolla, CA 92093-0347, USA.
*   To whom correspondence should be addressed.

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