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Related Concept Videos

Epigenetic Regulation01:37

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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Oropharyngeal Administration of Bleomycin in the Murine Model of Pulmonary Fibrosis
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DNA methylation reduces binding and cleavage by bleomycin.

Basab Roy1, Chenhong Tang, Mohammad P Alam

  • 1Center for BioEnergetics, Biodesign Institute, and Department of Chemistry and Biochemistry, Arizona State University , Tempe, Arizona 85287, United States.

Biochemistry
|September 5, 2014
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Summary

Cytidine methylation significantly reduces bleomycin-induced DNA cleavage, potentially impacting its antitumor activity. Methylation alters cleavage patterns and binding affinity, offering insights into bleomycin

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • Bleomycin (BLM) is an antitumor agent that induces DNA double-strand breaks.
  • Tumor cell DNA is often hypomethylated compared to normal cells.
  • Understanding methylation's effect on BLM activity is crucial for its therapeutic application.

Purpose of the Study:

  • To investigate the impact of cytidine methylation on Fe·bleomycin (Fe·BLM) induced DNA cleavage.
  • To determine how methylation affects Fe·BLM binding affinity to DNA.
  • To elucidate the molecular mechanisms underlying methylation-dependent changes in BLM activity.

Main Methods:

  • Synthesis and use of methylated and unmethylated hairpin DNA substrates.
  • Limited DNA cleavage assays to quantify Fe·BLM-induced DNA degradation.
  • Binding affinity studies to assess Fe·BLM interaction with methylated DNA.

Main Results:

  • Methylated hairpin DNAs showed a significant overall decrease in Fe·BLM-induced cleavage.
  • Cytidine methylation reduced cleavage at the methylation site but enhanced it at adjacent sites.
  • Two of three methylated DNAs exhibited dramatically decreased binding affinity for Fe·BLM.

Conclusions:

  • Cytidine methylation generally diminishes Fe·BLM-induced DNA cleavage and binding.
  • Methylation-induced changes in DNA structure likely underlie altered BLM interaction.
  • Findings suggest a potential role for DNA methylation in the antitumor selectivity of bleomycin.