Objective: To investigate the correlation between single nucleotide polymorphisms (SNPs) of SIRT1 gene promoter sequence and senile degenerative heart valvular disease (SDHVD). Methods: A total of 236 SDHVD patients and 285 healthy controls who visited the Affiliated Hospital of Jining Medical University between February 2012 and October 2016 were enrolled. SNPs of SIRT1 gene promoter were detected by Sanger sequencing. Typing and correlation were analyzed by χ(2) test and Logistic regression analysis. Haplotype and linkage disequilibrium were analyzed by Haploview4.2 software and SHEsis online software. The effect of SNPs on the binding of transcription factors to SIRT1 gene promoter was analyzed by electrophoretic mobility shift assay(EMSA). The transcription factors affected by SNPs were predicted by Transfac online software. Results: The frequency distribution of GG genotype of rs3740051 in the SDHVD group was significantly higher than that in the control group (χ(2)=4.855, P=0.028). There was a correlation between GG genotype of the rs3740051 and SDHVD. After adjusting for age, the risk of SDHVD in the carrier of GG genotype was 3.079 times higher than that of AA genotype(OR=3.079, 95%CI: 1.156-8.201, P=0.024). The five SNPs (rs3740051, rs932658, rs35995735, rs3740053 and rs2394443) showed strong linkage disequilibrium(D'>0.8). The haplotype analysis of the five SNPs (haplotype frequency<0 was ignored in the analysis) showed that 11 haplotypes (P<0.05) were formed, and the frequency of *A**C, AA**C, *AG*C, AAG*C, AA*AC, *AGAC and AAGAC in SDHVD group were significantly higher than that in control group (P<0.05, OR>1, 95%CI does not contains 1). EMSA showed that the color of the binding bands incubated by wild type probe and nucleoprotein was darker than that incubated by DNA sequence variation probe and nucleoprotein. Conclusion: The GG genotype of rs3740051 is associated with SDHVD and may be a risk genotype for SDHVD. The haplotype AC (across rs932658 and rs2394443) may be a dangerous haplotype of SDHVD. rs3740051 may affect the occurrence and development of SDHVD by interfering with the binding of FOXC protein to SIRT1 gene promoter.
目的： 探讨沉默信息调节因子1（SIRT1）基因启动子序列单核苷酸多态性（SNPs）与老年退行性心脏瓣膜病（SDHVD）的相关性。 方法： 对236例SDHVD组成员（2012年2月至2016年10月济宁医学院附属医院确诊为SDHVD的患者）与285名健康对照组成员（同期于济宁医学院附属医院体检中心体检的健康体检者）的SIRT1基因启动子序列进行统计分析。Sanger测序法检测SIRT1基因启动子序列SNPs；χ(2)、Logistic回归对SNPs进行基因型、等位基因分析和相关性分析，Haploview 4.2软件对SNPs进行连锁不平衡分析，SHEsis程序进行单倍型分析，凝胶迁移率变异实验（EMSA）分析SNPs对转录因子与SIRT1基因启动子相结合的影响，Transfac程序预测受多态性影响的与SIRT1基因启动子相结合的转录因子。 结果： rs3740051位点GG基因型与SDHVD的发生具有相关性，校正年龄后，其致SDHVD效应是AA基因型的3.079倍（OR=3.079，95%CI：1.156~8.201，P=0.024）。SIRT1基因启动子中，5个SNPs位点间呈强连锁不平衡（均D′>0.8），共形成11种P<0.05的单倍型，其中*A**C、AA**C、*AG*C、AAG*C、AA*AC、*AGAC和AAGAC在SDHVD组中具有更高的频率（均P<0.05，OR>1,95%CI不包含1）。EMSA示正常序列探针与核蛋白所孵育出的结合条带较突变序列探针与核蛋白所孵育出的结合条带颜色深。 结论： rs3740051位点GG基因型与SDHVD具有相关性且可能是SDHVD发生的危险性基因型。单倍型AC(跨rs932658和rs2394443）可能是SDHVD发生的危险性单倍型。rs3740051可能通过干扰FOXC蛋白与SIRT1基因启动子的结合影响SDHVD的发生发展。.
Keywords: Electrophoretic mobility shift assay; Haplotype; Senile degenerative heart valvular disease; Silent information regulator 1; Single nucleotide polymorphisms.