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Related Experiment Videos

Chromosomal DNA demethylation specified by protein binding.

I G Lin1, C L Hsieh

  • 1Department of Urology, University of Southern California, Norris Cancer Center, Los Angeles 90033, USA.

EMBO Reports
|March 22, 2001
PubMed
Summary

Protein binding, specifically the LacI repressor, triggers demethylation at specific DNA sites within the Escherichia coli chromosome. This process is reversible with isopropyl-beta-D-thiogalactopyranoside (IPTG) and targets DNA demethylation.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • DNA methylation is a crucial epigenetic modification influencing gene regulation.
  • Understanding the mechanisms that target DNA demethylation is essential for deciphering epigenetic control.
  • Previous studies suggested protein-mediated DNA demethylation, but in vivo chromosomal evidence was lacking.

Purpose of the Study:

  • To investigate whether protein binding can directly induce DNA demethylation at specific chromosomal sites.
  • To validate findings from episomal systems in the context of the native bacterial chromosome.
  • To establish the role of protein occupancy in targeting DNA demethylation events.

Main Methods:

  • Utilized the well-characterized Escherichia coli lac repressor/operator (lacI/lacO) system.

Related Experiment Videos

  • Introduced the lac repressor (LacI) into cells containing methylated lacO sites on the chromosome.
  • Assessed demethylation levels in the presence and absence of LacI and its inducer, isopropyl-beta-D-thiogalactopyranoside (IPTG).

    • Main Results:

    • The presence of LacI protein led to significant demethylation of methylated lacO sites on the chromosome.
    • Demethylation occurred progressively over time, correlating with LacI presence, indicating protein occupancy-driven targeting.
    • The LacI inhibitor, IPTG, prevented the demethylation of methylated lacO sites, demonstrating reversibility.

    Conclusions:

    • Protein binding to specific DNA sequences on the chromosome can directly induce site-specific demethylation.
    • These findings confirm and extend previous observations from episomal systems to the bacterial chromosome.
    • This study establishes protein binding as a mechanism for targeting DNA demethylation in vivo.