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Related Concept Videos

Lagging Strand Synthesis01:59

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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.
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Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins.  This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin...
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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.
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The DNA Replication Fork01:02

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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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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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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement

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Inferring the spatiotemporal DNA replication program from noisy data.

A Baker1, J Bechhoefer1

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 16, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to infer DNA replication initiation rates from experimental data. The approach uses Gaussian process regression for more accurate and flexible analysis of genome replication dynamics.

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Area of Science:

  • Genetics
  • Computational Biology
  • Molecular Biology

Background:

  • DNA replication is a fundamental process essential for cell division.
  • Understanding replication origin initiation is crucial for genome stability.
  • Current models often rely on simplified assumptions about initiation rates.

Purpose of the Study:

  • To generalize stochastic models of DNA replication.
  • To develop a method for inferring genome-wide replication origin initiation rates.
  • To address limitations of previous curve-fitting approaches.

Main Methods:

  • Generalization of a stochastic DNA replication model.
  • Development of a nonparametric inference method using Gaussian process regression.
  • Application to inferring initiation rates from simulated noisy replication data.

Main Results:

  • Successfully recovered simulated replication schemes with high precision.
  • Demonstrated the ability to infer initiation rates varying locally and over time.
  • Showcased the robustness of the method with typical experimental data noise.

Conclusions:

  • Gaussian process regression offers a powerful, flexible alternative to curve fitting for inferring replication dynamics.
  • The generalized model and inference method advance our understanding of genome replication control.
  • This approach has the potential to improve the analysis of experimental replication data.