Abstract:

Objective：To investigate the potential association between FADS1 rs174537 polymorphism and serum proteins in patients with aggressive periodontitis， which may provide benefits for diagnosis and treatment of aggressive periodontitis. Methods: A total of 353 patients with aggressive periodontitis (group AgP) and 125 matched controls (group HP) were recruited in the study．Genotyping of FADS1 rs174537 and serum biochemical indexes were tested at the study’s start. The relationships between the levels of TP, GLB, ALB, A/G and genotyping were analyzed. Results: （1）The detection rate of allele G in group AgP was higher than that in group HP（68.1% vs. 61.2%, P=0.046，OR=1.35，95% CI 1.00－1.83）; the detection rate of genotype GG in group AgP was higher than in group HP（45.5% vs. 34.4%，P=0.029, OR=1.60, 95% CI 1.05－2.44）. (2) In group AgP, the patients with GG genotype exhibited significantly lower TP, GLB than the patients with GT+TT genotype ［(77.08±7.88) g/L vs. (79.00±4.66) g/L， P=0.007；(28.17±7.63) g/L vs.(29.88±3.49) g/L，P=0.007） and the higher A/G（1.72±0.22 vs.1.67±0.22, P=0.040）, but there was no significant difference in ALB between the patients with GG genotype and the patients with GT+TT genotype. In group HP, there were no significant differences in TP, GLB, A/G and ALB between individuals with genotype GT+TT and with genotype GG. (3)Compared with individuals with genotype GT+TT in group HP, the AgP patients with genotype GT+TT exhibited significantly higher TP, GLB ［(79.00±4.66) g/L vs. (75.20±4.53) g/L, P<0.01; (29.88±3.49) g/L vs.(26.55±2.94) g/L, P<0.01）and the lo-wer A/G（1.67±0.22 vs. 1.88±0.30, P<0.01）, but there was no significant difference in ALB. There were no significant differences in TP, GLB, A/G and ALB the between the AgP patients with ge-notype GG and the healthy subjects with the same genotype either.Conclusion: FADS1 rs174537 polymorphism is associated with aggressive periodontitis. The patients with genotype GG in group AgP had relatively lower TP，GLB and higher A/G. Genotype GG might be a risk indicator for aggressive periodontitis by reducing host defense capability and contributing to inflammatory response in the occurrence and development of aggressive periodontitis.

Key words: Aggressive periodontitis, Globulins, Fattyacid desaturases, Polymorphism, genetic