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Related Concept Videos

The DNA Replication Fork01:02

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 forks, one in...
The DNA Replication Fork01:02

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 forks, one in...
DNA Replication02:40

DNA Replication

DNA replication involves the separation of the two strands of the double helix, with each strand serving as a template from which the new complementary strand is copied.  After replication, each double-stranded DNA includes one parental or “old” strand and one “new” strand. This is known as semiconservative replication. The resulting DNA molecules have the same sequence and are divided equally into the two daughter cells.
Replication in Prokaryotes
DNA replication uses a large number of...
Replication in Eukaryotes01:29

Replication in Eukaryotes

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.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Replication in Eukaryotes02:31

Replication in Eukaryotes

Overview
Replication in Eukaryotes01:29

Replication in Eukaryotes

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.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...

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Related Experiment Video

Updated: May 22, 2026

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
07:27

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

Published on: April 29, 2010

The conflict between DNA replication and transcription.

Peter McGlynn1, Nigel J Savery, Mark S Dillingham

  • 1School of Medical Sciences, Institute of Medical Sciences, University of Aberdeen, Foresterhill, Aberdeen, UK. p.mcglynn@abdn.ac.uk

Molecular Microbiology
|May 22, 2012
PubMed
Summary

DNA replication and transcription complexes frequently collide, causing genome instability. Organisms possess overlapping mechanisms to avoid or resolve these conflicts, ensuring genomic integrity across life.

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Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
08:06

Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement

Published on: January 19, 2017

Related Experiment Videos

Last Updated: May 22, 2026

Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
07:27

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

Published on: April 29, 2010

Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement
08:06

Genome-wide Determination of Mammalian Replication Timing by DNA Content Measurement

Published on: January 19, 2017

Area of Science:

  • Molecular Biology
  • Genetics
  • Genomics

Background:

  • Conflicts between DNA replication and transcription machinery are increasingly recognized as a source of genome instability.
  • These conflicts, involving replisomes and transcription complexes, pose challenges to DNA replication fidelity.
  • While studied in bacteria, transcriptional barriers to replication are now understood as a universal biological phenomenon.

Purpose of the Study:

  • To review current knowledge on mechanisms preventing collisions between DNA replisomes and transcription complexes.
  • To summarize the known pathways for resolving collisions when they occur.
  • To provide an overview of the diverse strategies organisms employ to manage replication-transcription conflicts.

Main Methods:

  • Literature review of studies on DNA replication-transcription conflicts.
  • Analysis of molecular mechanisms for collision avoidance and resolution.
  • Synthesis of findings across different organisms, from bacteria to eukaryotes.

Main Results:

  • Replication-transcription conflicts are a universal challenge impacting genome stability.
  • A variety of mechanisms exist to minimize collisions, including regulatory pathways and physical barriers.
  • When collisions occur, specific resolution pathways are activated to prevent replication blockage and DNA damage.
  • These avoidance and resolution systems are complex and often overlap, indicating significant evolutionary pressure.

Conclusions:

  • Organisms have evolved sophisticated, multifaceted systems to manage conflicts between DNA replication and transcription.
  • Understanding these mechanisms is crucial for comprehending genome stability and evolution.
  • Further research is needed to fully elucidate the intricacies of these essential cellular processes.