Affiliation:
1. Department of Biology, University of California, San Diego, La Jolla, CA 92093-0347, USA.
Abstract
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.
Publisher
American Association for the Advancement of Science (AAAS)
Reference30 articles.
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