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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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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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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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MUS81-EME2 promotes replication fork restart.

Alessandra Pepe1, Stephen C West1

  • 1London Research Institute, Cancer Research UK, Clare Hall Laboratories, South Mimms, Herts EN6 3LD, UK.

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|May 13, 2014
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Summary
This summary is machine-generated.

The MUS81-EME2 endonuclease restarts stalled replication forks in human cells during S phase. It also maintains telomeres in Alternative Lengthening of Telomeres (ALT) cells, distinct from MUS81-EME1

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • Replication forks can stall at difficult genomic regions or due to DNA damage.
  • Endonucleolytic cleavage is a key mechanism for restarting stalled replication forks.

Purpose of the Study:

  • To identify the endonuclease responsible for replication fork cleavage and restart in human cells.
  • To elucidate the distinct roles of MUS81-EME1 and MUS81-EME2 in genome stability.

Main Methods:

  • Investigated the function of MUS81-EME2 in human cell cultures.
  • Analyzed the role of MUS81-EME2 in telomere maintenance in ALT cells.
  • Compared the functions of MUS81-EME1 and MUS81-EME2 in different cell cycle phases.

Main Results:

  • MUS81-EME2 is the structure-selective endonuclease responsible for replication fork cleavage and restart during S phase.
  • MUS81-EME2 also plays a role in telomere maintenance in telomerase-negative ALT cells.
  • MUS81-EME1 mediates G2/M functions, including cleavage of recombination intermediates and fragile site expression.

Conclusions:

  • MUS81-EME2 has distinct S phase-specific roles in replication fork restart and telomere maintenance.
  • MUS81-EME1 functions in G2/M phase for DNA repair and genome stability.
  • These findings reveal distinct temporal and functional roles for MUS81-EME1 and MUS81-EME2 in maintaining genome stability.