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Related Experiment Videos

DNA replication can overcome the silencer function on transcription.

M Yamaguchi1, A Matsukage

  • 1Laboratory of Cell Biology, Aichi Cancer Center Research Institute, Nagoya, Japan.

The New Biologist
|April 1, 1990
PubMed
Summary

DNA replication can overcome transcriptional silencing. Silencer elements upstream of the mouse DNA polymerase-beta gene lose their repressive function when DNA replication is active, demonstrating replication

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Epigenetics

Background:

  • Specific DNA sequences, known as cis-acting transcriptional silencers, can repress gene expression.
  • These silencers, located upstream of the mouse DNA polymerase-beta gene, affect not only its own transcription but also that of other genes.

Purpose of the Study:

  • To investigate the impact of DNA replication on the function of these transcriptional silencer elements.
  • To determine if active DNA replication influences the repressive capacity of silencers.

Main Methods:

  • Utilized transiently replicating plasmids containing the chloramphenicol acetyltransferase (CAT) gene and replication origins (ori) from polyoma virus and SV40.
  • Transfected these plasmids into various cell lines, including mouse NIH 3T3, monkey CV1, MOP8, and COS1 cells, which differ in their ability to support plasmid replication via T antigen.
  • Assessed silencer function by measuring CAT gene expression in cells with and without active plasmid replication.

Main Results:

  • Silencer elements effectively repressed transcription in non-permissive cells (NIH 3T3, CV1) where plasmids did not replicate.
  • Silencer function was abolished in permissive cells (MOP8, COS1) that support T antigen-driven plasmid replication.
  • This effect was independent of plasmid copy number, indicating a direct role for replication itself.

Conclusions:

  • Ongoing DNA replication can completely override the transcriptional repression mediated by these specific silencer elements.
  • This suggests a dynamic interplay between DNA replication machinery and transcriptional silencing mechanisms.

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