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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...
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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 forks, one in...
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Single-stranded DNA transposition is coupled to host replication.

Bao Ton-Hoang1, Cécile Pasternak, Patricia Siguier

  • 1Laboratoire de Microbiologie et Génétique Moléculaires, Centre National de Recherche Scientifique, Unité Mixte de Recherche 5100, 118 Route de Narbonne, F31062 Toulouse Cedex, France. bao.tonhoang@ibcg.biotoul.fr

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|August 10, 2010
PubMed
Summary
This summary is machine-generated.

Transposon movement, specifically insertion sequences (ISs), is linked to DNA replication forks. The direction of replication and stalled forks influence IS608 and ISDra2 transposition, impacting prokaryotic evolution.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • DNA transposition is a key driver of evolution in prokaryotes and eukaryotes.
  • Insertion sequences (ISs) are simple prokaryotic transposons classified by their structure and transposition mechanisms.
  • The IS200/IS605 family utilizes single-stranded DNA intermediates during transposition.

Purpose of the Study:

  • To investigate the relationship between IS608 and ISDra2 transposition and the host replication fork.
  • To determine the role of replication direction in IS excision.
  • To explore the potential for directing IS insertion to specific genomic locations.

Main Methods:

  • Experimental analysis of IS608 and ISDra2 transposition.
  • Manipulation of replication fork dynamics, including helicase function and Okazaki fragment synthesis.
  • In silico genomic analysis to assess the prevalence and distribution of IS200/IS605 family members.

Main Results:

  • Transposition of IS608 and ISDra2 is directly linked to the host replication fork.
  • Maximal IS excision occurs when the 'top' IS strand is on the lagging-strand template.
  • IS excision is enhanced by transient inactivation of replicative helicase or inhibition of Okazaki fragment synthesis.
  • IS608 insertion shows orientation preference for the lagging-strand template and can be directed to stalled replication forks.

Conclusions:

  • Replication direction and fork status critically influence IS200/IS605 family transposition.
  • IS transposition mechanisms are integrated with host DNA replication processes.
  • This integration likely facilitates the dissemination and evolutionary impact of IS elements.