N-甲酰肽受体基因单核苷酸多态性与侵袭性牙周炎易感性的关系

目的：探讨N-甲酰肽受体（N-formylpeptide receptor, FPR）基因单核苷酸多态性（single nucleotide polymorphism, SNP）与侵袭性牙周炎（aggressive periodontitis, AgP）易感性的关系。方法：选择AgP患者94例，健康对照者73例。抽取前臂静脉血，提取基因组DNA，PCR扩增目的基因片段，用变性高效液相色谱（denature high perfor mance liquid chromatography, DHPLC）结合DNA测序的方法检测FPR基因的SNP。结果：发现370 bp的FPR基因片段有两个非同义的SNP，即289位C/A和301位G/C，其中289位C/A为新发现的SNP，未检测到329位和378位存在SNP。FPR基因289位和301位等位基因∕基因型频率在健康对照组和AgP组之间的差异无统计学意义。通过多元Logistic分析发现，有FPR301C⁺基因型（即G/C和C/C）且吸烟者患AgP的风险是有FPR301G/G基因型、不吸烟者的5.74倍；携带C等位基因且吸烟者患AgP的风险是携带G等位基因、不吸烟者的5.20倍。结论：FPR301C⁺基因型∕等位基因C与吸烟联合作用使个体患AgP的危险性增高。本研究未发现FPR基因的SNP与AgP的易感性明显相关。

Association of SNPs in N-formylpeptide receptor gene with susceptibility of aggressive periodontitis

Objective: To explore the association of the single nucleotide polymorphisms (SNPs) in N-formylpeptide receptor (FPR) gene with the susceptibility of aggressive periodontitis (AgP). Methods: A total of 94 AgP patients and 73 healthy controls were entered into the study. Peripheral blood sample was obtained from each subject by venepuncture. Genomic DNA was isolated from each sample.The target fragment of FPR gene was amplified by PCR. The SNPs in FPR gene were detected by denature high performance liquid chromatography ( DHPLC) combined with DNA sequencing. Results: There were two non-synonymous SNPs in the 370 bp FPR gene fragment;289C/A and 301G/C. The 289C/Awas a novel SNP. No variation in nucleotides 329 and 378 was detected. There were no statistically significant differences in distributions of the genotypes and alleles for FPR289 and FPR301 between AgP patients and healthy controls. Using multivariate logistic regression (adjusted for age and gender) , it was showed that the adjusted Ors of AgP for the C~+ genotype and allele C of FPR301 combined with smoking were 5.74 and 5.20 respectively. Conclusion: The presence of the C~+ genotype/allele C of FPR301 together with smoking conferred a higher risk for AgP. The result suggests that the SNPs in FPR gene may not be associated with the susceptibility of AgP in Chinese.