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[Is the replicon model applicable to higher eukaryotes?]

A M de Recondo1

  • 1UPR 9044 du CNRS Génétique et biologie moléculaire de la réplication, Institut de recherches sur le cancer, Villejuif, France.

Comptes Rendus De L'Academie Des Sciences. Serie III, Sciences De La Vie
|February 4, 1999
PubMed
Summary
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Molecular & general genetics : MGG·1995
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The Replicon model explains DNA replication initiation in E. coli and eukaryotes. Recent discoveries reveal conserved mechanisms, like the origin recognition complex (ORC), suggesting a unified initiation process across species.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The Replicon model, proposed 35 years ago, explains DNA replication initiation in *Escherichia coli* via replicators and initiator proteins.
  • Its extension to eukaryotes identified autonomously replicating sequences (ARSs) in yeast, but essential DNA sequences for replication start sites in higher eukaryotes remain elusive.
  • Early embryonic cells in *Xenopus* and *Drosophila* do not require specific DNA sequences for replication initiation or rereplication prevention.

Purpose of the Study:

  • To explore the conserved mechanisms of DNA replication initiation across prokaryotes and eukaryotes.
  • To reconcile the apparent differences in replication control between yeast and metazoan embryos.
  • To understand the remodeling and disassembly of protein complexes during replication initiation.

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Main Methods:

  • Review of existing literature on DNA replication models and conserved initiator proteins.
  • Characterization of the origin recognition complex (ORC) as a conserved eukaryotic initiator.
  • Analysis of the two-step replication initiation mechanism involving prereplicative complexes (PreRCs) and cyclin-dependent kinase regulation.

Main Results:

  • The origin recognition complex (ORC) is conserved from yeast to humans and present in embryonic cells, suggesting a shared initiation mechanism.
  • Eukaryotic DNA replication is regulated by a two-step process: PreRC assembly followed by origin firing.
  • Cyclin-dependent kinases control the temporal separation of PreRC formation and firing, preventing re-replication.

Conclusions:

  • The fundamental mechanism of DNA replication initiation is conserved between prokaryotes and eukaryotes.
  • The apparent differences in replication control between yeast and metazoan embryos are likely superficial.
  • Further research is needed to elucidate how complexes are remodeled during replication initiation to transition to active replication machinery.