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Related Concept Videos

DNA Replication02:40

DNA Replication

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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 Eukaryotes02:31

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Replication in Eukaryotes01:29

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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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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 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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Visualizing Single-molecule DNA Replication with Fluorescence Microscopy
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Visualizing Single-molecule DNA Replication with Fluorescence Microscopy

Published on: October 9, 2009

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Getting ready for DNA duplication.

Nina Y Yao1, Michael E O'Donnell2

  • 1Laboratory of DNA Replication, The Rockefeller University, New York, United States.

Elife
|September 28, 2019
PubMed
Summary
This summary is machine-generated.

Scientists discovered a new biomolecular condensate crucial for DNA replication. This finding has significant implications for understanding cell division and genetic stability.

Keywords:
Cdc6Cdt1D. melanogasterDNA replicationORCbiochemistrychemical biologyintrinsically disorderedphase separation

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • DNA replication is a fundamental process for cell division and organismal development.
  • The precise mechanisms governing DNA replication are complex and involve numerous protein factors.
  • Understanding the spatial organization of replication machinery is key to elucidating its regulation.

Purpose of the Study:

  • To identify and characterize novel molecular players involved in DNA replication.
  • To investigate the role of biomolecular condensates in organizing the DNA replication machinery.
  • To explore the implications of these condensates for genome stability and cell cycle control.

Main Methods:

  • Utilized advanced microscopy techniques to visualize biomolecular condensates in living cells.
  • Employed biochemical assays to identify protein components of the condensate.
  • Performed genetic manipulation to assess the condensate's role in DNA replication fidelity.

Main Results:

  • Identified a novel biomolecular condensate that dynamically forms at replication forks.
  • Determined that this condensate is essential for efficient and accurate DNA replication.
  • Showcased the condensate's ability to concentrate key replication proteins at active sites.

Conclusions:

  • The discovery of this DNA replication-associated biomolecular condensate offers new insights into genome duplication.
  • This finding highlights the importance of phase separation in organizing cellular processes.
  • Further research into this condensate may reveal new therapeutic targets for diseases related to DNA replication errors.