SCN7A 基因单核苷酸多态性与原发性与原发性高血压的相关研究

目的　检测中国人电压调控钠通道 7型α亚单位基因 (sodium channel,voltage- gated,type ,alpha polypeptide,SCN7A)调控区和编码区的单核苷酸多态性 (single nucleotide polymorphisms,SNPs) ,并探讨其与上海汉族人群原发性高血压的关系。　方法　采用直接测序法检测基因启动子、编码区和部分内含子的序列 ,以确定中国人群中 SCN7A基因 SNPs的位置及类型。采用聚合酶链反应 -限制性片段长度多态性及直接测序法 ,对上海汉族 96例原发性高血压患者和 96名正常血压对照者进行 SNP检测和关联研究。对所发现的 P<0 .0 5的 SNP位点 ,进一步扩大样本 (病例、对照组各 2 88例 )加以验证。结果　在 13132 bp的测序长度中 ,共发现 32个 SNP,包括启动子区 7个 ,编码区 10个 (其中改变氨基酸编码的 6个 ) ,3′非编码区 1个 ,内含子区 14个 ,其中 30个为新发现的 SNP。关联研究结果显示 SNP0 2 1在病例和对照组中的分布差异存在显著性 (P <0 .0 1) ,该 SNP多态可改变氨基酸的编码序列。　结论SCN7A基因变异可能与上海汉族人群原发性高血压相关。

Association of single nucleotide polymorphism in human SCN7A gene with essential hypertension in Chinese

OBJECTIVE: To identify the single nucleotide polymorphisms (SNPs) in the regulatory and coding regions of human SCN7A (sodium channel, voltage-gated, type VII, alpha polypeptide) gene and to investigate the association of some of these SNPs with essential hypertension (EH) in Chinese. METHODS: The promoter region, exons, as well as part of the introns of SCN7A gene were sequenced by a fluorescent labeling automatic sequencing method to identify and characterize the SNPs in Chinese population. SNP genotyping was performed by PCR-RFLP or direct DNA sequencing in unrelated EH patients and normotensive controls from a Chinese Han population residing in Shanghai area. Case-control studies on seven SNPs were first carried out in 96 patients and 96 normotensive controls. The positive finding was further verified in an extended study containing 288 patients and 288 controls. RESULTS: Thirty-two SNPs were identified through a 13,132 bp sequencing of SCN7A gene. Among them, seven were in regulatory region, ten in coding regions, one in 3'UTR and fourteen in introns. Thirty SNPs were novel SNPs, and a cSNP in exon 18 (SNP021) was associated with hypertension. CONCLUSION: The SNP021 in the gene SCN7A is associated with essential hypertension of Chinese Han population in Shanghai and the role of SCN7A gene in hypertension deserves to be further analyzed.