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Related Experiment Videos

Transcription through a simple DNA repeat blocks replication elongation

M M Krasilnikova1, G M Samadashwily, A S Krasilnikov

  • 1Department of Molecular Genetics, University of Illinois at Chicago, Chicago, IL 60607, USA.

The EMBO Journal
|September 2, 1998
PubMed
Summary
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Guanine-cytosine rich repeats impede DNA replication forks in bacteria. Transcription of these repeats, particularly the d(C)n sequence, causes replication arrest by stalling RNA polymerase, offering a novel regulatory mechanism.

Area of Science:

  • Genetics
  • Molecular Biology
  • Biochemistry

Background:

  • DNA replication is crucial for cell division and genome stability.
  • Guanine-cytosine (G-C) rich repeats are known to form secondary structures that can interfere with DNA processes.
  • The precise mechanisms by which these repeats influence replication are not fully understood.

Purpose of the Study:

  • To investigate the impact of d(G)n.d(C)n repeats on plasmid replication in Escherichia coli.
  • To elucidate the role of transcription in repeat-mediated replication impediment.
  • To identify the molecular basis for replication fork arrest at these repeats.

Main Methods:

  • Electrophoretic analysis of replication intermediates.
  • In vitro transcription assays using bacterial and phage RNA polymerases.

Related Experiment Videos

  • Analysis of replication and transcription coupling.

    • Main Results:

    • d(G)n.d(C)n repeats impede replication fork progression in a length- and orientation-dependent manner.
    • Replication arrest is primarily driven by the transcription of the repeats.
    • Transcription of the d(C)n sequence as a template blocks both transcription and replication.
    • A stalled RNA polymerase ternary complex is hypothesized to cause replication fork halting.

    Conclusions:

    • Transcription-coupled replication arrest at G-C rich repeats represents a novel regulatory mechanism for replication elongation.
    • This mechanism may contribute to repeat length polymorphism and genome rearrangements.
    • Understanding this process is important for comprehending genome stability and evolution.