Genetic markers of tumour necrosis factor α in aggressive and chronic periodontitis
J Clin Periodontol 2008; 35: 493–500 doi: 10.1111/j.1600-051X.2008.01226.x
Susanne Schulz1, Helmut K. G. Machulla2, Wolfgang Altermann2,Jana Klapproth1, Uta Zimmermann1,
Christiane Gla¨ser3, AlexanderKluttig4, Jamal Stein5, Hans-Gu¨nterSchaller1 and Stefan Reichert1
1University School of Dental Medicine,Department of Operative Dentistry andPeriodontology, Martin-Luther Universityof Halle-Wittenberg, Halle, Germany;2Interbranch HLA Laboratory/Department
Schulz S, Machulla HKG, Altermann W, Klapproth J, Zimmermann U, Gla¨ser C,
GHATT, Martin-Luther University of Halle-
Kluttig A, Stein J, Schaller H-G, Reichert S. Genetic markers of tumour necrosis factor
Wittenberg, Halle, Germany; 3Institute of
a in aggressive and chronic periodontitis. J Clin Periodontol 2008; 35: 493–500. doi:
Martin-Luther University of Halle-Wittenberg,Halle, Germany; 4Institute of Medical
Epidemiology, Biostatistics, and Informatics,
Aim: Tumour necrosis factor a (TNFa) plays an important role in the pathogenesis of
Martin-Luther University of Halle-Wittenberg,
periodontitis. TNFa production is influenced by gene polymorphisms. The aim of this
study was to evaluate links between genetic variants and chronic/aggressive
periodontitis in a multivariate model.
Subjects: One hundred and twenty-three periodontitis patients (chronic: n 5 54,aggressive: n 5 69) and 52 healthy controls without periodontitis were included in thestudy. Material and Methods: Single nucleotide polymorphisms (SNPs) c. À 308G4A,c. À 238G4A and haplotypes were analysed by a polymerase chain reaction withsequence-specific primers (PCR-SSP). The clinical investigation included smokingstatus, plaque and bleeding indexes, pocket depth and attachment loss. Results: Prevotella intermedia occurred more frequently in individuals positive forthe À 308GG/ À 238GG haplotype combination (Odds Ratio 5 2, 95% Confidenceinterval: 1.1–3.7, p 5 0.037, 1 À b 5 61%). In binary logistic regression analyses, thisTNFa haplotype could not be shown to be associated with periodontitis consideringsmoking, age, gender and approximal plaque index or subgingival bacterial
Key words: aggressive periodontitis; chronic
colonization as confounding factors.
periodontitis; haplotype; tumour necrosis
Conclusions: Although the genetic background of TNFa could be shown to be
associated with subgingival colonization with P. Intermedia, there is no evidence thatit is an independent risk factor for periodontitis in multivariate models.
Accepted for publication 13 February 2008
blasts, the induction of cytokine produc-
of matrix metalloproteinases (Borish &
affected by certain characteristics of the
individual immune system (Honda et al.
factor involved in the aetiology of perio-
Parts of the study were funded by a grant
(D’Aiuto et al. 2005, 2007, Feng et al.
response via the activation of cells, such
Journal compilation r 2008 Blackwell Munksgaard
of periodontal bacteria, in a multivariate
advanced periodontitis (Galbraith et al.
(Ikezawa et al. 2005, Engebretson et al.
gival hyperplasia or received antibiotics
periodontitis. Therefore, the initial aim of
this study was to investigate the impact of
c. À 238G4A, including their haplotypes,
evaluate the influence of genetic variants
ders for periodontitis, such as age, gender,
Table 1. Clinical characteristics of the groups of patients and healthy controls
Individual occurrence of periodontal bacteria in subgingival pockets
np40.05 in comparison with the control group (normal distribution of all metric values ! statistical evaluation with parametric tests). nnp40.05 in comparison with the control group (Chi2-test or Fisher’s exact test if no5).
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Genetic variants of TNFa in periodontitis
they were taking medication or smoked.
mal plaque index (API) (Lange et al.
rs361525 (c. À 238G4A), respectively.
taken at six sites around each tooth.
Inclusion criteria for patients suffering
951C, 40 s 531C, 40 s 701C; and 8 min.
Fisher’s exact test was performed.
teeth, at least three of the affected teeth
–Smirnov test (test of normal distribu-
hybridization were included in the test.
tion). For the statistical evaluation, the
mally distributed values) and the Mann–
Clinical details of the patient groups are
covariates for periodontitis such as age,
sity Clinic of Heidelberg, Germany).
ethical guidelines of the ‘‘Declaration of
All individuals involved in the study were
Helsinki’’ and its amendment in ‘‘Tokyo
evaluated according to their age, gender,
patient groups with the periodontitis-free
healthy controls, no statistically signifi-
cant differences in age, gender and smok-
subgingival scaling was carried out.
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Table 2. Influence of genotype, allele and haplotype distribution of tumour necrosis factor a
Table 3. Association of the individual geno-
(TNFa) SNPs c. À 308G4A and c. À 238G4A in dependence on the occurrence of chronic and
type/haplotype distribution and the occurrence
of five subgingival periodontal bacteria inthe total study group. Only for Prevotella
intermedia could a significant association beproven
nAn almost two-fold increase in the prevalence of genotype and haplotype carriers among healthy
subjects compared with patients suffering from periodontitis.
be proven in the entire study group.
CP, chronic periodontities; AP, aggressive periodontities.
outcome of periodontitis, namely BOP,and the TNFa haplotype could be
their clinical status (AP and CP groups),
detected in the group of patients suffer-
of patients, there was an increase in the
no significant association could be found
no significant difference with respect to
(1 À b) of the corresponding evaluations
patients with CP and the control group.
mutant alleles (BOP %): 77.4 Æ 18.9).
factors, known to affect periodontitis, on
prevalence of P. intermedia. (Table 3).
investigated by means of logistic regres-
sion analysis. Because there is a correla-
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Genetic variants of TNFa in periodontitis
Table 4. Forward stepwise binary logistic regression analyses investigating the impact of the genetic background of tumour necrosis factor a(TNFa) (haplotype combinations GG–GG versus GG–AG1GG–GA1AG–AG) on periodontitis considering the occurrence of periodontal bacteria(a) and age, gender, smoking and approximal plaque index (b)
(a) Patients with periodontitis versus healthy subjects
Patients with chronic periodontitis versus healthy subjectsPrevotella gingivalis
Patients with aggressive periodontitis versus healthy subjectsPorphyromonas gingivalis
(b) Patients with periodontitis versus healthy subjects
Patients with chronic periodontitis versus healthy subjectsAPI
Patients with aggressive periodontitis versus healthy subjectsAPI
p 5 0.001), two separate statistical ana-
lyses were performed. In the initial step,
gingival crevicular fluid of patients with
periodontal tissues (Loos et al. 2005).
tics is considered to be a candidate gene
for periodontitis. In this study, the influ-
established results (Pihlstrom et al.
predictor for periodontitis in this model.
(Cortelli et al. 2005). The most interest-
dontal bacteria among healthy controls.
tures, the influence of the genetic back-
subjects have no clinical signs of perio-
dontitis despite bacterial colonization.
well-characterized periodontitis patients
with generalized CP or generalized AP.
dontitis. Because periodontitis increases
plex diseases including periodontitis.
with age and usually occurs after the age
study in order to investigate the associa-
r 2008 The AuthorsJournal compilation r 2008 Blackwell Munksgaard
the occurrence of periodontitis including
not detect a statistically significant influ-
dontal bacteria were investigated. It was
causal role, the variant is in close vici-
to the occurrence of periodontal bacteria
association is only caused by a stratifi-
carriers, it was not possible to detect a
highly selected unrelated individuals.
This requires high attention in selecting
(Palmer et al. 2005, Pihlstrom et al.
controls (according to statistical evalua-
assess the importance of the functionally
gated in the present study (Yoshie et al.
clinical association study addressing the
first time, we investigated the influence
et al. 1999, Soga et al. 2003, Lin et al.
2003; for a review, see Shapira et al.
Folwaczny et al. 2004, Donati et al.
2005, Loos et al. 2005), many researchers
more substantiated results, our prelimin-
variants and periodontitis (Endo et al.
ary results should be indicative for pro-
Folwaczny et al. 2004, Donati et al.
statistical settings as well as by ethnic
differences in genotype distributions.
et al. 2007). In our multivariate models,
tribution were reported by others (Cuenca
et al. 2001). In contrast to other studies
(Craandijk et al. 2002, D’Aiuto et al.
Despite the limitations of clinical asso-
loss of power due to ethnic variability.
paid to the clinical selection criteria of
patients and controls. Only patients with
host’s bacterial defence mechanism.
basis is yet to be clarified. In previous
were taken into consideration, the genetic
Journal compilation r 2008 Blackwell Munksgaard
Genetic variants of TNFa in periodontitis
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E-mail: susanne.schulz@medizin.uni-halle.de
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MIXED DONOR CHIMERISM AND LOW LEVEL IDURONIDASEEXPRESSION MAY BE ADEQUATE FOR NEURODEVELOPMENTALJENNIFER CONWAY, MD, SARAH DYACK, MD, FRCPC, FCCMG, BRUCE N. A. CROOKS, MB, CHB, BSC, MRCP,Hurler syndrome is a lysosomal storage disease resulting in fatal cardiac or neurologic sequelae unless alpha-iduronidaseproduction is reconstituted with hematopoietic stem cell transplantation. We report on a
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