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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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Homologous Recombination02:31

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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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Translesion DNA Polymerases02:10

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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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RAD52 resolves transcription-replication conflicts to mitigate R-loop induced genome instability.

Manisha Jalan1, Aman Sharma2, Xin Pei2

  • 1Department of Radiation Oncology, MSKCC, New York, NY, 10065, USA. jalanm@mskcc.org.

Nature Communications
|September 5, 2024
PubMed
Summary
This summary is machine-generated.

RAD52 protein prevents genome instability by managing RNA-DNA hybrid (R-loop) structures that cause dangerous collisions between DNA replication and transcription. RAD52 deficiency leads to more R-loops, DNA damage, and mutations, especially in tumors.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transcription-replication collisions threaten genomic stability.
  • RNA-DNA hybrids (R-loops) contribute to these collisions.
  • RAD52 is a known DNA repair factor.

Purpose of the Study:

  • To investigate RAD52's role in preventing transcription-replication collisions.
  • To understand how RAD52 influences R-loop formation and resolution.

Main Methods:

  • Assessed R-loop accumulation in RAD52-deficient cells.
  • Examined RAD52 interactions with transcription machinery.
  • Analyzed DNA damage and mutation burden in human tumor samples.

Main Results:

  • RAD52 deficiency leads to increased R-loop accumulation and DNA damage.
  • RAD52 interacts with transcription machinery and facilitates R-loop dissolution.
  • Low RAD52 expression correlates with increased double-strand breaks at R-loop sites in tumors.

Conclusions:

  • RAD52 is crucial for preventing transcription-replication collisions.
  • RAD52 maintains genome stability by regulating R-loops.
  • RAD52 plays a significant role in cancer genome integrity.