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Epigenetic Regulation01:46

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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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.
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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent...
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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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Robust Ligature-Induced Model of Murine Periodontitis for the Evaluation of Oral Neutrophils
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Epigenetic Regulation in the Pathogenesis of Periodontitis.

H Dommisch1, A S Schäfer2, D Kuzmanova2

  • 1Department of Periodontology, Oral Medicine and Oral Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany.

Journal of Periodontal Research
|September 15, 2025
PubMed
Summary

Epigenetic changes in DNA methylation are linked to periodontitis, influenced by inflammation and smoking. Further research is needed to overcome limitations and translate these findings into clinical applications for periodontal disease.

Keywords:
DNARNAblood cellsepigenetic modificationgingival tissuegingivitisinflammationmethylationperiodontitissmoking

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Area of Science:

  • Epigenetics and Periodontal Disease Research
  • Molecular Mechanisms of Chronic Inflammation

Background:

  • Epigenetic modifications regulate gene expression and are implicated in various diseases.
  • The specific role of epigenetics in periodontitis pathogenesis is not yet fully understood.
  • Environmental factors and chronic inflammation are known contributors to periodontitis.

Purpose of the Study:

  • To critically review the current evidence on epigenetic mechanisms in periodontitis.
  • To highlight methodological challenges in studying epigenetic modifications in periodontal tissues.
  • To explore the potential of epigenetic alterations as biomarkers and therapeutic targets for periodontitis.

Main Methods:

  • Systematic review of existing literature on epigenetics and periodontitis.
  • Analysis of studies investigating DNA methylation, histone modifications, and RNA modifications.
  • Evaluation of methodological approaches and limitations in current research.

Main Results:

  • Chronic inflammation and exposures like tobacco smoke induce stable DNA methylation changes in gingival tissues.
  • Specific genes (e.g., CYP1B1, AHRR, ROBO2, PTP4A3) show altered epigenetic marks related to detoxification, repair, and immunity.
  • Most studies are limited by small sample sizes and analyses of mixed cell populations, complicating interpretation.
  • DNA CpG methylation is the most studied epigenetic modification, while histone and RNA modifications are underrepresented.

Conclusions:

  • Epigenetic regulation, particularly DNA methylation, contributes to periodontitis pathogenesis.
  • Methodological limitations, including cellular heterogeneity and small cohorts, hinder clinical translation.
  • Future research should focus on larger, standardized studies addressing cellular specificity and exploring the reversibility of epigenetic marks.
  • Tissue-specific epigenetic profiling holds promise for early detection, risk stratification, and personalized prevention of periodontal disease.