山东胃癌高低发人群Lewis基因多态性分析

应用PCR产物直接测序的方法,检测山东省胃癌高发的临朐人群和低发的苍山人群中Lewis基因多态性T59G的分布,旨在探讨山东临朐和苍山地区胃癌发病率显著不同的内在原因,为阐明临朐地区胃癌高发的机制提供实验依据。结果表明,T59G突变个体在临朐和苍山人群中的分布频率分别为34.5%和31.6%,差别无统计学意义,P＞0.05,OR为1.14 （95% CI,0.59~2.19）。提示就此点突变而言,临朐人群和苍山人群为同一人群,具有极其相似的遗传背景;T59G不能作为区分临朐和苍山人群的遗传标志,与这两个地区胃癌发病的区别没有相关性。 Abstract:To explore the cause leading to the difference in incidence of gastric cancer between Linqu and Cangshan populations,Shandong Province,and to provide evidence for the possible mechanism of high incidence of gastric cancer in Linqu County,the distribution of T59G mutation in Lewis gene was screened between Linqu and Cangshan populations by PCR-sequencing.The frequency of individuals with T59G mutation was 34.5% in Linqu population and 31.6% in Cangshan population,respectively,with no significant difference,P＞0.05,and OR is 1.14 (95% CI,0.59~2.19).This suggests that Linqu and Cangshan populations may share the same genetic background.T59G mutation of Lewis gene could not be used as a genetic marker for Linqu and Cangshan populations and is not relevant to the difference in incidence of gastric cancer between them.     

山东临朐胃癌高发人群和北京人群Lewis血型抗原相关SE基因多态性分析

为探讨宿主的遗传背景和幽门螺杆菌（Helicobacter pylori,H.pylori）相关胃癌的易感性之间的关系,本文采用PCR产物直接测序和PCR-RFLP的方法,检测142例山东临朐县胃癌高发人群个体（包括69例癌症患者和73例非癌个体）和93例北京正常对照个体SE基因多态性的分布特点。结果显示：sew/sew基因型在山东非癌个体和北京人群之间的分布差异具有统计学意义（P＜0.01,OR=3.06,95% CI,1.28~7.30）,sew/sew基因型在山东癌症病人和非癌个体之间分布频率无显著性差异,H.pylori感染状况与SE基因型的分布也无关联性。提示：sew/sew纯合突变在山东临朐人群中分布频率较高,可能为临朐人群的遗传标记之一。 Abstract:To study the relation between host genetic backgroud and the susceptibility to H.pylori associated gastric cancer,PCR-sequencing and PCR-RFLP were used to screen SECRETOR gene polymorphisms in 142 subjects including 69 cancer patients and 73 non-cancer individuals from high-risk area of gastric cancer in Shandong and 93 control individuals from Beijing.Results showed that the difference in sew/sew distribution between non-cancer individuals and Beijing population was significant(P＜0.01,OR is 3.06,95% CI,1.28~7.30),but that between cancer patients and non-cancer individuals was not with significance.SE gene polymorphism was not relevant to H.pylori infection.We concluded that Shandong population from high-risk area of gastric cancer shared a high distribution of sew/sew genotype,which could be considered as one of the genetic markers.