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Related Concept Videos

Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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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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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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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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Related Experiment Video

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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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Replication Fork Reversal and Protection.

Shan Qiu1,2,3, Guixing Jiang1, Liping Cao1

  • 1Department of General Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China.

Frontiers in Cell and Developmental Biology
|May 27, 2021
PubMed
Summary
This summary is machine-generated.

Replication fork reversal protects stalled DNA replication forks in mammalian cells from collapse. Key proteins like BRCA1 and RAD51 remodel and shield these structures during replication stress.

Keywords:
DNA translocasegenome instabilityreplication fork reversalreplication fork stallingreplication stress

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Genome replication involves replication forks that can stall due to various obstacles.
  • Stalled replication forks are unstable and prone to collapse, potentially leading to genomic instability.
  • Replication fork reversal is a crucial mechanism in higher eukaryotes to protect against replication stress.

Purpose of the Study:

  • To review the key factors and mechanisms involved in the remodeling and protection of stalled replication forks in mammalian cells.
  • To highlight the role of replication fork reversal as a protective response.
  • To discuss the proteins that safeguard reversed forks.

Main Methods:

  • Literature review of research on replication fork dynamics and DNA repair.
  • Analysis of studies focusing on stalled and reversed replication fork structures.
  • Examination of the functions of proteins like BRCA1, BRCA2, and RAD51 in fork protection.

Main Results:

  • Replication fork reversal forms a Holliday junction-like structure, shielding the fork.
  • Proteins including BRCA1, BRCA2, and RAD51 protect reversed forks from nuclease degradation.
  • These proteins exhibit cooperative and unique functions in maintaining fork stability.

Conclusions:

  • Replication fork remodeling and protection are essential for maintaining genome integrity during replication stress.
  • The coordinated action of DNA damage repair proteins is critical for stabilizing reversed forks.
  • Understanding these mechanisms provides insights into preventing genomic instability in mammalian cells.