J Periodontal Implant Sci.  2013 Jun;43(3):111-120. 10.5051/jpis.2013.43.3.111.

Epigenetic biomarkers: a step forward for understanding periodontitis

Affiliations
  • 1Division of Epigenomics and Cancer Risk Factors, German Cancer Research Center (DKFZ), Heidelberg, Germany.
  • 2Department of Nutritional Science and Food Management, College of Health Science, Ewha Womans University, Seoul, Korea. park.yoonjung@ewha.ac.kr

Abstract

Periodontitis is a common oral disease that is characterized by infection and inflammation of the tooth supporting tissues. While its incidence is highly associated with outgrowth of the pathogenic microbiome, some patients show signs of predisposition and quickly fall into recurrence after treatment. Recent research using genetic associations of candidates as well as genome-wide analysis highlights that variations in genes related to the inflammatory response are associated with an increased risk of periodontitis. Intriguingly, some of the genes are regulated by epigenetic modifications, supposedly established and reprogrammed in response to environmental stimuli. In addition, the treatment with epigenetic drugs improves treatment of periodontitis in a mouse model. In this review, we highlight some of the recent progress identifying genetic factors associated with periodontitis and point to promising approaches in epigenetic research that may contribute to the understanding of molecular mechanisms involving different responses in individuals and the early detection of predispositions that may guide in future oral treatment and disease prevention.

Keyword

DNA methylation; Epigenetics; Genetic variation; Histone code; Inflammation; Periodontitis

MeSH Terms

Animals
DNA Methylation
Epigenomics
Genetic Variation
Histone Code
Humans
Inflammation
Metagenome
Mice
Periodontitis
Recurrence
Tooth

Figure

  • Figure 1 Intrinsic and extrinsic risk factors for periodontitis. (A) Factors influencing the pathogenesis of periodontitis in the oral cavity. (B) Methods of large-scale analysis to identify genetic factors, epigenetic patterns, comprehensive transcriptomics, proteomics, metabolomics, and microbiomics in close connection to environmental factors.

  • Figure 2 Chromatin changes by epigenetic modifications and transcriptional status. Schematic overview of chromatin changes by typical epigenetic modifications. Combinations of epigenetic modifications contribute to determining chromatin structure, leading to an open or closed chromatin configuration and transcriptional state. For example, reduced DNA methylation at the promoter of the interferon gamma (IFNG) gene is associated with increased expression of IFNG in the inflamed tissues from periodontitis patients, compared to healthy periodontal tissues.

  • Figure 3 Genetic and epigenetic alterations in disease progression. Genetic and epigenetic alterations contribute to gene expression either with or without changes in DNA sequences, respectively. Normal expression can be interrupted via genetic alteration by production of abnormal protein or altered efficiency of gene transcription. Likewise, interruption can be accomplished by epigenetic alterations at transcriptionally regulatory regions. The 'black box' represents exons while the 'grey box' represents introns or regulatory regions. The 'highlighted G' represents a nucleotide that has replaced a dominant or a normal nucleotide as genetic variation or mutation, respectively. White and black circles indicate the different statuses of epigenetic modifications at the regulatory elements of a given gene. Specifically, white circles indicate unmethylated cytosines at the promoter that usually allow active transcription, while 'black circles' indicate methylated cytosines at the promoter that usually suppress transcription.


Cited by  1 articles

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Restor Dent Endod. 2015;40(1):14-22.    doi: 10.5395/rde.2015.40.1.14.


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