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Restarting Stalled Replication Forks

Restarting Stalled Replication Forks

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,...

Restarting Stalled Replication Forks

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The DNA Replication Fork

The DNA Replication Fork

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...

The DNA Replication Fork

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Translesion DNA Polymerases

Translesion DNA Polymerases

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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DNA Damage can Stall the Cell Cycle

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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

Updated: Mar 8, 2026

Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System

Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System

Published on: August 21, 2016

Replication Fork Protection Factors Controlling R-Loop Bypass and Suppression.

Emily Yun-Chia Chang¹, Peter C Stirling²

¹Terry Fox Laboratory, British Columbia Cancer Agency, 675 West 10th Ave., Vancouver, BC V5Z1L3, Canada. echang@bccrc.ca.

|January 19, 2017

Summary

This summary is machine-generated.

Robust DNA replication is crucial for genome stability, preventing conflicts between transcription and replication. Proper replisome function mitigates R-loop structures, thereby reducing genomic instability.

Keywords:

DNA repair DNA replication stress R-loop transcription–replication conflict

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Last Updated: Mar 8, 2026

Inducing a Site Specific Replication Blockage in E. coli Using a Fluorescent Repressor Operator System

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Published on: August 21, 2016

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase

Published on: April 29, 2010

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication

Author Spotlight: Unveiling the Role of SNF2L in Replication Fork Stability and Genome Duplication

Published on: August 23, 2024

Area of Science:

Molecular Biology
Genetics
Genomics

Background:

Replication-transcription conflicts are a known cause of genome instability, often linked to RNA processing errors.
Recent findings implicate replication fork protection defects in stabilizing R-loops, promoting these conflicts.

Approach:

This work reviews recent advances in understanding replication fork-associated proteins.
It highlights the role of replisome function in mitigating R-loop associated genome instability.

Key Points:

Defects in fork protection can stabilize R-loops, leading to transcription-replication conflicts and genome instability.
Essential replication factors like topoisomerase and the MCM helicase complex, along with fork protection factors (e.g., Fanconi anemia pathway), help resolve these conflicts.
Normal and robust replisome function is identified as a key factor in preventing R-loop coupled genome instability.

Conclusions:

Robust replisome function is essential for maintaining genome stability by preventing R-loop formation and transcription-replication conflicts.
Understanding these mechanisms offers insights into genome instability disorders.