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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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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
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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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DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
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SAF-A promotes origin licensing and replication fork progression to ensure robust DNA replication.

Caitlin Connolly1, Saori Takahashi2, Hisashi Miura2

  • 1Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, UK.

Journal of Cell Science
|December 10, 2021
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Summary
This summary is machine-generated.

Scaffold-attachment factor A (SAF-A) is crucial for robust DNA replication and cell proliferation. Depleting SAF-A impairs DNA replication, origin licensing, and fork progression, leading to cell cycle defects.

Keywords:
ChromatinDNA replicationReplication stress

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Chromatin organization is vital for biological processes like DNA replication.
  • Scaffold-attachment factor A (SAF-A), also known as HNRNPU, influences chromatin structure.

Purpose of the Study:

  • To investigate the role of SAF-A in DNA replication progression and resumption.
  • To analyze the impact of SAF-A depletion on replication origins, fork dynamics, and timing.

Main Methods:

  • SAF-A depletion using cellular assays.
  • Analysis of origin licensing and activation.
  • Replication fork progression and DNA synthesis rate measurements.
  • Single-cell replication timing analysis.
  • Assessment of DNA damage markers (γ-H2AX) and cell quiescence.

Main Results:

  • SAF-A depletion reduces origin licensing in G1 and activation in S phase.
  • Replication fork progression is less consistent, decreasing DNA synthesis rate.
  • SAF-A depletion blurs early/late replication domain boundaries and reconciles discordant replication timing and compartmentalization.
  • SAF-A-depleted cells exhibit increased γ-H2AX and a tendency towards quiescence.

Conclusions:

  • SAF-A is essential for normal DNA replication progression and resumption.
  • SAF-A ensures robust DNA replication, supporting continuous cell proliferation.
  • SAF-A plays a significant role in regulating replication timing and maintaining genome stability.