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Smoking Modifies the Genetic Risk for Early-Onset Periodontitis.

S Freitag-Wolf1, M Munz2,3, R Wiehe2

  • 1Institute of Medical Informatics and Statistics, University Hospital Schleswig-Holstein, Kiel University, Germany.

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|September 21, 2019
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Summary
This summary is machine-generated.

Smoking combined with genetic factors significantly increases early-onset periodontitis risk. Tobacco smoke directly impacts genes regulating bone health, tissue repair, and immune responses, highlighting a critical gene-environment interaction in this severe gum disease.

Keywords:
bone developmentgenetic predisposition to diseasegenome-wide association studylogistic modelsoral diseasetobacco

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Area of Science:

  • Genetics and Periodontology
  • Gene-Environment Interactions
  • Oral Health Research

Background:

  • Early-onset periodontitis is a severe destructive disease affecting adolescents and young adults.
  • Genetic susceptibility and smoking are known risk factors, but their combined effect is not well understood.
  • Understanding gene-smoking interactions is crucial for identifying disease mechanisms and potential interventions.

Purpose of the Study:

  • To identify genetic variants associated with early-onset periodontitis that are influenced by tobacco smoke exposure.
  • To investigate the direct impact of tobacco smoke on the expression of genes implicated in periodontitis.
  • To elucidate the gene-smoking interaction in the context of severe alveolar bone destruction.

Main Methods:

  • Genome-wide association study (GWAS) analyzing 79,780,573 common variants in 741 individuals with early-onset periodontitis.
  • Case-only logistic regression analysis comparing never versus ever smokers to identify gene-smoking interactions.
  • In vitro study exposing primary gingival fibroblasts to cigarette smoke extract to quantify gene expression changes via reverse transcription polymerase chain reaction.

Main Results:

  • Identified 16 loci associated with increased early-onset periodontitis risk when interacting with smoking (P < 5 × 10^-5).
  • Found genome-wide significant cis expression quantitative trait loci for ST8SIA1 and SOST, suggesting their causal role in tobacco-related periodontitis.
  • Demonstrated that cigarette smoke extract significantly altered the expression of SSH1 and ST8SIA1, genes involved in immune response and bone homeostasis.

Conclusions:

  • Genetic predisposition to early-onset periodontitis is partly triggered by smoking.
  • Tobacco smoke directly modulates the expression of key genes involved in bone homeostasis, tissue repair, and immune responses.
  • This study reveals a significant gene-environment interaction, where smoking exacerbates genetic susceptibility to severe periodontitis.