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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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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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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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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Replication of G Quadruplex DNA.

Leticia Koch Lerner1, Julian E Sale2

  • 1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, CB2 0QH, UK. leticia@mrc-lmb.cam.ac.uk.

Genes
|February 1, 2019
PubMed
Summary
This summary is machine-generated.

DNA replication can be impeded by secondary structures like G-quadruplexes (G4s). Additional proteins resolve these structures, ensuring DNA synthesis stability and preventing genetic instability.

Keywords:
DNA helicasesDNA replicationDNA secondary structureG quadruplex

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication is typically depicted as a smooth process.
  • Non-B DNA secondary structures can obstruct the replisome.
  • Maintaining replication requires proteins beyond the core replisome to resolve DNA impediments.

Purpose of the Study:

  • To review how DNA secondary structures impede replication.
  • To explore eukaryotic replisome responses to DNA impediments.
  • To examine cellular mechanisms for resolving DNA secondary structures.

Main Methods:

  • Literature review focusing on DNA secondary structures and replication.
  • Analysis of recent advances in replisome structure and function.
  • Case study on G-quadruplexes (G4s) and their resolution.

Main Results:

  • Non-B DNA structures pose significant challenges to replisome progression.
  • Specialized proteins are crucial for resolving DNA secondary structures.
  • Coupling DNA synthesis with unwinding by the replicative helicase is key.

Conclusions:

  • Resolving DNA secondary structures is vital for processive DNA replication.
  • Failure to resolve impediments can lead to genetic and epigenetic instability.
  • Helicases play a critical role in resolving structures like G4s.