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Related Concept Videos

The DNA Replication Fork01:02

The DNA Replication Fork

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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Restarting Stalled Replication Forks02:37

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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DNA Replication02:40

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DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
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Replication in Prokaryotes01:32

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DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the single origin of replication (ori) on the cell's circular chromosome. Replication then proceeds around the entire circle of the chromosome in each direction from the two replication forks, resulting in two DNA molecules.
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Replication in Prokaryotes02:35

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Updated: Nov 9, 2025

Visualization of DNA Replication in the Vertebrate Model System DT40 using the DNA Fiber Technique
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DNA molecular combing-based replication fork directionality profiling.

Marion Blin1, Laurent Lacroix2, Nataliya Petryk2,3

  • 1Département de Gastro-entérologie, pôle MAD, Assistance Publique des Hôpitaux de Marseille, Centre Hospitalier Universitaire de Marseille, Marseille, France.

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Summary
This summary is machine-generated.

Replication fork directionality (RFD) mapping reveals previously undetected inefficient origins in metazoan genomes. This new method provides a comprehensive view of genome replication dynamics by analyzing DNA replication tracks.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • The precise replication strategy of metazoan genomes remains largely unknown due to the absence of comprehensive replication origin maps.
  • Existing high-throughput methods often overlook inefficient replication origins, focusing only on efficient initiation sites.
  • Single-molecule analyses provide insights into initiation events but typically offer limited overviews of replication dynamics.

Purpose of the Study:

  • To develop and apply a novel method for mapping replication origins and understanding genome replication dynamics in metazoans.
  • To investigate the role and detectability of inefficient replication origins.
  • To compare single-molecule data with population-averaging methods for genome replication analysis.

Main Methods:

  • Computed replication fork directionality (RFD) profiles for two large genes (DMD and CCSER1) in chicken DT40 cells using molecular combing.
  • Aggregated hundreds of oriented replication tracks from individual DNA fibers to generate RFD profiles.
  • Compared RFD profiles with population-averaging profiles from Okazaki fragment sequencing.

Main Results:

  • RFD profiles successfully reconstituted replication domains with initiation and termination zones, consistent with mammalian genome replication.
  • The study demonstrated that inefficient origins do not produce detectable RFD shifts, explaining their invisibility in population-based assays.
  • The developed method quantitatively profiles replication and identifies discrete initiation events.

Conclusions:

  • The novel RFD profiling method offers a comprehensive approach to studying metazoan genome replication.
  • This technique successfully visualizes and accounts for inefficient replication origins, providing a more complete picture of genome duplication.
  • The findings reconcile single-molecule observations with population-based data, advancing our understanding of genome replication strategies.