Polymorphism of genes encoding toll-like receptors and inflammatory cytokines in periodontal disease in the Japanese population.
Periodontitis, which is a widespread and major dental disease, is a multifactorial, lifestyle-related disease and has been analyzed for gene polymorphism. We examined the frequency of the polymorphisms of the pro-inflammatory cytokine genes IL-1 A (-889) and IL-1 B (+3953) in relation to periodontitis in the Japanese population. We also examined whether polymorphism of TLR2 (Arg677Trp) and TLR4 (Asp299Gly), which are receptors recognized by periodontopathic bacteria, may also be associated with periodontitis. The subjects were 92 Japanese individuals, among whom 43 had periodontitis and 49 were healthy controls. We isolated genomic DNA from lingual mucosal cells and tested them for single nucleotide polymorphisms by polymerase chain reaction-restriction fragment length polymorphism. The incidence of polymorphisms was analyzed statistically by Fisher's exact test, and the sensitivity and specificity of the gene polymorphisms were calculated. The purpose was to determine whether such polymorphisms might be effectively used in the diagnosis of periodontitis. However, we found no evidence that the gene polymorphism of IL-1A (p = 0.082), IL-1 B (p = 0.180), TLR2 (p = 1.000) or TLR4 (p = 1.000) and overall gene polymorphism in any of the genes (p = 0.752) correlate with periodontitis. The sensitivity (14.0%) and specificity (83.7%) of the mutations found in all of the genes were low. Therefore, we advise against using the analyses of polymorphism of these genes to detect periodontitis in the Japanese population.
Imamura
Yasuhiro
Y
Department of Pharmacology, Matsumoto Dental University, 1780 Gohbara, Hiro-oka, Shiojiri-city, Nagano 399-0781, Japan.
Fujigaki
Yoshihisa
Y
Oomori
Yuriko
Y
Kuno
Tomoko
T
Ota
Norio
N
Wang
Pao-Li
PL
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001120:Arginine / Q000235:genetics; D001224:Aspartic Acid / Q000235:genetics; D005998:Glycine / Q000235:genetics; D006801:Humans; D053582:Interleukin-1alpha / Q000235:genetics*; D053583:Interleukin-1beta / Q000235:genetics*; D007564:Japan; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D010518:Periodontitis / Q000235:genetics / Q000276:immunology* / Q000382:microbiology; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D012680:Sensitivity and Specificity; D051195:Toll-Like Receptor 2 / Q000235:genetics*; D051197:Toll-Like Receptor 4 / Q000235:genetics*; D014364:Tryptophan / Q000235:genetics
D053582:Interleukin-1alpha; D053583:Interleukin-1beta; D051195:Toll-Like Receptor 2; D051197:Toll-Like Receptor 4; D001224:Aspartic Acid; D014364:Tryptophan; D001120:Arginine; D005998:Glycine