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Related Concept Videos

Replication in Eukaryotes02:31

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In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
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A global profile of replicative polymerase usage.

Yasukazu Daigaku1, Andrea Keszthelyi1, Carolin A Müller2

  • 1Genome Damage and Stability Centre, University of Sussex, Brighton, UK.

Nature Structural & Molecular Biology
|February 10, 2015
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Summary
This summary is machine-generated.

Genome replication relies on specific DNA polymerases. This study maps polymerase usage, confirming their distinct roles in leading and lagging strand synthesis, with subtle variations observed within replicons.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Eukaryotic genome replication involves three essential DNA polymerases: Pol α-primase, Pol ε, and Pol δ.
  • Pol α-primase initiates DNA synthesis, while Pol ε and Pol δ are responsible for leading and lagging strand synthesis, respectively.
  • The genome-wide maintenance and uniformity of this division of labor within replicons remain largely uncharacterized.

Purpose of the Study:

  • To develop and apply a novel method for mapping DNA polymerase usage across the entire genome.
  • To investigate the genome-wide division of labor between Pol ε and Pol δ during DNA replication.
  • To assess the uniformity of polymerase usage within individual replication origins.

Main Methods:

  • Development of a polymerase usage sequencing (Pu-seq) strategy.
  • Application of Pu-seq in the fission yeast Schizosaccharomyces pombe.
  • Genome-wide mapping of DNA polymerase activity and replication origins.

Main Results:

  • Pu-seq successfully mapped DNA polymerase usage genome-wide, providing direct data on replication origin location and efficiency.
  • The study confirmed the broad maintenance of the division of labor between Pol ε and Pol δ for leading and lagging strand synthesis, respectively.
  • Subtle variability in polymerase usage was detected within individual replicons, suggesting dynamic polymerase exchange.

Conclusions:

  • The established division of labor between DNA polymerases ε and δ is largely conserved across the eukaryotic genome.
  • Occasional initiation of leading-strand synthesis by Pol δ, followed by exchange for Pol ε, may explain the observed variability within replicons.
  • Pu-seq is a valuable tool for dissecting the complexities of DNA replication dynamics and polymerase function.