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Related Concept Videos

Lagging Strand Synthesis01:59

Lagging Strand Synthesis

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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
There are several major differences between synthesis of the leading strand and synthesis of the lagging strand. 1) Leading strand synthesis happens in the direction of replication fork opening, whereas lagging strand synthesis happens in the...
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Homologous Recombination02:31

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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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The Replisome03:01

The Replisome

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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.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
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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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Replication in Prokaryotes01:32

Replication in Prokaryotes

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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.
Many Proteins Work Together to Replicate the Chromosome
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Replication in Prokaryotes02:35

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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

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Reconstructing DNA replication kinetics from small DNA fragments.

Haiyang Zhang1, John Bechhoefer

  • 1Department of Physics, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 29, 2006
PubMed
Summary
This summary is machine-generated.

This study corrects for DNA fragment size bias in replication experiments. New methods provide more accurate estimates of DNA replication origin initiation and base copying rates.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • DNA replication in higher organisms initiates from multiple origins simultaneously.
  • In vitro experiments measure DNA replication states using DNA fragments.
  • Estimating replication kinetics from fragment data is challenging due to size bias.

Purpose of the Study:

  • To develop a method for correcting bias in DNA replication kinetics measurements caused by DNA fragment size.
  • To derive unbiased estimators for average domain lengths in replicated and nonreplicated DNA.
  • To improve the accuracy of replication kinetics parameters extracted from experimental data.

Main Methods:

  • Derivation of theoretical relationships between original and fragment domain-length distributions.
  • Development of unbiased average-domain-length estimators.
  • Application of new estimators to existing experimental data.

Main Results:

  • A systematic method to account for finite DNA fragment size bias in replication studies.
  • Unbiased estimators that provide accurate domain length averages, even for large domains.
  • Improved estimates of DNA replication origin initiation rates and base copying rates.

Conclusions:

  • The developed methods effectively correct for fragment size bias in DNA replication studies.
  • Accurate estimation of replication kinetics parameters is crucial for understanding DNA replication dynamics.
  • This work enhances the reliability of in vitro DNA replication data analysis.