DNA损伤修复基因hOGG1的遗传多态与肝癌易感性研究

目的:探索DNA损伤修复基因hOGG1的遗传多态Ser326Cys与肝细胞肝癌易感性的关系。方法:对96例原发性肝细胞肝癌患者和96例对照外周血DNA进行测序分型。结果:Ser/Cys杂合子个体的OR值为1.5,Cys/Cys纯合子个体的OR值为1.9,表现出剂量效应。结论:DNA修复基因hOGG1的Cys等位基因可能增加肝细胞肝癌的遗传易感性。     

hOGG1和XPD基因多态性与消化系统肿瘤遗传易感性的关系

  目的  研究DNA损伤修复基因hOGG1和XPD单核苷酸多态性与胃癌、肝癌和结直肠癌易感性的关系。  方法  用DNA抽提试剂盒从肿瘤患者外周血标本中抽提基因组DNA, 其中胃癌患者98例, 肝癌患者76例, 结直肠癌患者95例, 非肿瘤对照组80例。采用聚合酶链式反应-限制性片断长度多态性(PCR-RFLP)方法测定hOGG1 Ser326Cys和XPD Lys751Gln的基因型分布, 采用SPSS 16.0软件进行分析。  结果  携带hOGG1Cys 326Cys基因型使患胃癌、肝癌和结直肠癌的风险分别增加1.485倍(P=0.036)、1.114倍(P=0.011)和1.940倍(P=0.001)。携带hOGG1 326Cys等位基因同时饮酒者, 可增加胃癌发病风险38%(P=0.008), 肝癌发病风险增加30%(P=0.036);携带XPDLys751Gln基因型胃癌、肝癌和结直肠癌的风险分别增加2.150倍(P=0.003)、2.340倍(P=0.002)和1.292倍(P=0.008)。携带XPD751Gln等位基因并饮酒可使胃癌发病风险增加26%(P=0.027), 肝癌发病风险增加40%(P=0.005)。同时携带hOGG1 326Cys和XPD 751Gln等位基因, 患胃癌的危险性降低24%(P=0.010), 患肝癌和结直肠癌的危险性分别增加40%(P=0.003)和23%(P=0.016)。  结论  hOGG1基因的Cys 326Cys基因型和XPD基因的Lys751Gln基因型可能是胃癌、肝癌和结直肠癌发生的遗传易感因素, 携带hOGG1326Cys等位基因或XPD 751Gln等位基因且饮酒, 可能增加胃癌和肝癌的易感性。      

DNA修复基因XPC PAT遗传多态与肺癌的关系

目的 探讨DNA修复基因XPC Poly(AT)多态与肺癌的关系。方法 以PCR方法分析597例肺癌患者和509例正常人XPC PAT基因型分布,并比较不同基因型与肺癌风险的关系。结果 正常人群中,XPC PAT ／ 、PAT ／-和PAT-／-基因型频率分别为12．4％、49．7％和37．9％,肺癌患者中分别为11．2％、46．7％和42．1％,差异无显著性(P=0．37)。与携带至少一个XPC PAT等位基因比较,携带PAT ／ 基因型个体患肺癌的风险并未增高(校正OR=0．8;95％ CI为0．55-1．16)。该基因多态与吸烟无联合作用。结论 中国人肺癌风险与DNA修复基因XPC PAT多态无关。     

代谢基因多态与大肠癌遗传易感性

本文综述了与大肠癌化学致癌过程有关的酶系多态性与大肠癌的遗传易感性关系。谷胱甘肽－Ｓ－转移酶为致癌物代谢有关的酶，ＧＳＴＭ１缺失与大肠癌有关，但尚不确定。肉类经高温处理可产生杂环胺，回顾前瞻性研究表明，ＮＡＴ１／ＮＡＴ２快速酶与肉类进食量对大肠癌危险度有交互作用。亚甲基四氢叶酸还原酶基因型ｖａｌ／ｖａｌ可降低大肠癌的危险度。细胞色素Ｐ４５０酶是多环芳烃与杂环胺类的重要代谢酶系，人群研究表明ＣＹＰ１     

髓过氧化物酶基因-463G/A多态与中国人肺癌遗传易感性

目的 研究髓过氧化物酶（MPO）基因－463G→A单核苷酸多态与肺癌易感性的关系。方法 以PCR－单链构像多态（SSCP）技术,分析了314例肺癌患者和320例正常对照者MPO基因启动子区第－463位核苷酸多态基因型分布,及其与肺癌风险的关系。结果 正常对照组中G和A等位基因频率分别为85.0%和15.0%,而肺癌患者分别为89.0%和11.0%。携带MPO－463GG基因型的个体患肺癌风险比携带GA和AA基因型个体高1.7倍（校正的OR为1.7;95%CI为1.2-2.5）,且此种风险增高只限于肺鳞癌（OR为2.4;95%CI为1.4-3.9）,而与肺腺癌无关（OR为1.3;95%CI为0.8-2.1）。分层分析结果表明,与GA和AA基因型比较,GG基因型并不增加非吸烟者和累积吸烟量＜26包年者患肺癌的风险,但在累积吸烟量≥26包年的吸烟者中,GG基因型发生肺鳞癌的风险比GA和AA基因型高3.3倍。结论 MPO－463 A等位基因显著降低中国人发生吸烟相关性肺鳞癌的风险。     

DNA损伤修复基因XRCC和hOGG1多态性与肺癌易感性的关系

DNA损伤修复基因的多态性能够改变DNA修复功能和效率,影响肿瘤易感性.许多研究报道DNA损伤修复基因多态性可能与肿瘤易感性有关,其突变在多种肿瘤的发生、发展过程中起着重要作用.另外,DNA损伤修复基因可能与其他基因相互作用,共同影响肿瘤的发生、发展.肺癌是目前在这方面被研究得最多的肿瘤.文章就DNA损伤修复基因XRCC和hOGG1多态性的生物学特点以及这些基因单核苷酸多态性与肿瘤易感性等方面进行了综述,为该基因用于肿瘤的预防、诊治提供理论借鉴.     

DNA修复基因XRCC1多态性与肺癌易感性的关系

目的:研究碱基切除修复基因XRCC1多态性与肺癌易感性的关系。方法:采用病例-对照研究,收集太原市原发性肺癌患者111例为病例组,同时随机抽取210名健康居民作为对照组,并进行流行病学调查。应用PCR-RFLP方法分析由内切酶MspI识别XRCC1基因Arg399Gln位点的多态性,比较不同基因型与肺癌易感性的关系,以及基因多态性与吸烟之间对肺癌易感性的交互作用。结果:XRCC1密码子399杂合基因型Arg/Gln可能对鳞癌有较弱的保护效应,并可能降低吸烟者患肺癌的危险性。而纯合突变基因型Gln/Gln与和吸烟的存在协同作用可显著提高肺癌的危险度。结论:碱基切除修复基因XRCC1密码子399的多态性可能会对肺癌易感性产生影响,并可能与吸烟量之间存在一定的协同作用。     

NQO1基因多态性与肺癌遗传易感性

目的：探讨依赖还原型辅酶１／２醌氧化还原的酶基因ｃＤＮＡ６００位Ｃ→Ｔ点突变怕致物基因多态必理否与肺癌遗传多态性有关。方法：采用聚合酶锭反应－限制性片段长度多态性（ＰＣＲ－ＲＦＬＰ）的分析方法分析队列 肺癌病人与１３６例健康成人对照组ＮＱＯ１的基因多态性。结果：Ｔ等位基因频率在肺癌组和对照组分别为５４％、４３％,两组有显著差异（Ｐ＝０．０２４）。基因型分布在肺癌组和组之间差异显著（Ｐ＝０．００８）     

XRCC1基因多态与肿瘤遗传易感性研究进展

X射线交错互补修复基因1(XRCC1)通过直接与聚合酶β、DNA连接酶Ⅲ和多聚ADP核糖聚合酶形成复合物，共同参与因电离辐射和氧化损伤引起的碱基切除修复和单链断裂修复。XRCC1基因中存在3个单核苷酸多态位点，各位点多态对各种肿瘤遗传易感性的影响不一。现对XRCC1基因多态与某些肿瘤遗传易感性进行综述。     

Association of the hOGG1 Ser326Cys Polymorphism with Increased Lung Cancer Susceptibility in Asians: a Metaanalysis of 18 Studies Including 7592 Cases and 8129 Controls

Objective: To understand the influence of the hOGG1 Ser326Cys polymorphism on lung cancer susceptibility,an updated meta-analysis was performed. Methods: A total of 7,592 patients and 8,129 controls from 18 studies,identified by searching ISI Web of Knowledge, PubMed, EMBase and CNKI database up to January 2011,were included. Unconditional multivariable logistic regression was used to estimate odds ratios (ORs) and 95%confidence intervals (CIs). Results: Overall, the hOGG1 Ser326Cys polymorphisms were associated with the riskof lung cancer. In the subgroup analyses by ethnicity, histological type, smoking status, significant associationwith lung cancer risk in Asians was found either in the dominant (crude OR, 1.19; 95% CI, 1.07-1.33 for Cys/Cys+Ser/Cys versus Ser/Ser) or recessive (crude OR, 1.21; 95% CI, 1.08-1.35 for Cys/Cys versus Ser/Cys+Ser/Ser) model. An increased risk with statistical significance was found in recessive model for squamous carcinoma(adjusted OR, 1.91; 95% CI, 1.30-2.80) and adenocarcinoma (adjusted OR, 1.52; 95% CI, 1.23-1.87). Significantassociation with lung cancer risk among heavy smokers was found in the recessive model (crude OR, 1.67; 95%CI, 1.26-2.21). Conclusions: The results indicated that the hOGG1 Ser326Cys polymorphism might contributeto the risk of non-small cell lung cancer in the Asian population.     

PIM1启动子区基因多态性与非小细胞肺癌易感性的相关性研究

原癌基因PIM1通过活化下游基因,参与细胞增殖、分化及肿瘤形成。本研究旨在探讨中国人群PIM1基因启动子区（-1 882A>T）单核苷酸多态性与非小细胞肺癌易感性的相关性。方法：应用聚合酶链反应-直接测序法检测25例患者及25例正常对照者的PIM1基因启动子区多态性,应用聚合酶链反应-直接测序法检测206例非小细胞肺癌患者以及189例正常对照者-1 882A>T多态性位点的基因型,并进行病例、对照相对危险度分析。结果：等位基因-1 882T在肺癌患者和健康对照者中频率分别为6.8%和11.0%,等位基因分布频率在两组间存在显著性差异（P=0.025）。相对危险度分析显示携带TA+TT基因型者发生非小细胞肺癌的风险明显低于携带AA基因型者（OR=0.568,95%CI=0.335～0.962,P=0.034）。结论：中国人中PIM1基因启动子区单核苷酸多态性（-1 882A>T）与非小细胞肺癌发生可能有关,T等位基因的存在可能降低肺癌发生的风险,可能是发生非小细胞肺癌的保护性因素。     

hOGG1 Ser326Cys polymorphism and susceptibility to gallbladder cancer in a Chinese population

The human oxoguanine glycosylase 1(hOGG1) gene encodes a DNA glycosylase that is involved in excision repair of 8-OH-dG (8-hydroxy-2-deoxyguanine) from oxidatively-damaged DNA. To determine whether hOGG1 plays a role in the risk for adenocarcinoma of the gallbladder, we tested the association of this polymorphism with gallbladder cancer in a Chinese population-based, case control study of 204 cases and 209 controls. The subjects were genotyped with a polymerase chain reaction-restriction fragment length polymorphism (PCR-RELP) assay. The association between the genetic polymorphism of this gene and risk of the cancer was examined by using a multivariate analysis. We found that the distribution of hOGG1 Ser326Cys genotypes among controls (Ser/Ser, 37.3%; Ser/Cys, 53.6% and Cys/Cys, 9.1%) was significantly different from that among gallbladder cancer cases (Ser/Ser, 43.1%; Ser/Cys, 36.3% and Cys/Cys, 20.6%). Significantly increased risk for gallbladder cancer was both the hOGG1 326Ser/Cys (Odds ratio [OR] = 1.9, 95% confidence interval (CI) = 1.0-3.7) and hOGG1 326Cys/Cys genotypes (OR = 4.5, 95% CI = 1.1-22.4). We observed no statistically significant association between hOGG1 genotype and gallbladder cancer association in gallstone absence. In contrast, a near-significant increase in risk for gallbladder cancer was observed for gallstone presence with the hOGG1 326Ser/Cys genotype (OR = 2.2, CI = 1.4-3.5) whereas a significant increase in association for gallbladder cancer was observed for gallstone presence with the 326Cys/Cys genotype (OR = 6.1, CI = 2.1-27.2). These data corresponded with the fact that a significant trend towards increased association for gallbladder cancer was observed with potentially higher-risk hOGG1 genotypes in gallstone presence(p < 0.001, chi(2) trend test)but not in gallstone absence(p = 0.89, chi(2) trend test). A significant increase in risk for gallbladder cancer was observed for larger gallstone (those with stone diameters 2 cm or greater) with the hOGG1 326Ser/Cys(OR = 1.9, 95% CI = 1.1-2.9) and hOGG1 326Cys/Cys genotypes(OR = 5.9, 95% CI = 1.6-18.0). These data are consistent with the observation that a significant trend towards increased risk for gallbladder cancer was observed with potentially higher-risk hOGG1 genotypes in gallbladder cancer patients with larger gallstone (p < 0.001, chi(2) trend test). However, we observed no statistically significant association between hOGG1 genotype and gallbladder cancer risk in gallbladder cancer patients with smaller gallstone (those with stone diameters 2 cm smaller) (hOGG1 326Ser/Cys:OR = 2.2, 95% CI = 0.8-4.0; hOGG1 326Cys/Cys:OR = 2.9, 95% CI = 0.6-29.4; p = 0.06, chi(2) tread test). These results suggest that hOGG1 Ser326Cys polymorphism is associated with gallbladder cancer risk.     

hOGG1, p53 genes, and smoking interactions are associated with the development of lung cancer

This study aimed to investigate the effects of Ser/Cys polymorphism in hOGG1 gene, Arg/Pro polymorphism in p53 gene, smoking and their interactions on the development of lung cancer. Ser/Cys polymorphism in hOGG1 and Arg/Pro polymorphism in p53 among 124 patients with lung cancer and 128 normal people were detected using PCR-RFLP. At the same time, smoking status was investigated between the two groups. Logistic regression was used to estimate the effects of Ser/Cys polymorphism and Arg/Pro polymorphisms, smoking and their interactions on the development of lung cancer. ORs (95% CI) of smoking, hOGG1 Cys/Cys and p53 Pro/ Pro genotypes were 2.34 (1.41-3.88), 2.12 (1.03-4.39), and 2.12 (1.15-3.94), respectively. The interaction model of smoking and Cys/Cys was super-multiplicative or multiplicative, and the OR (95% CI) for their interaction item was 1.67 (0.36 -7.78). The interaction model of smoking and Pro/Pro was super-multiplicative with an OR (95%CI) of their interaction item of 5.03 (1.26-20.1). The interaction model of Pro/Pro and Cys/Cys was multiplicative and the OR (95%CI) of their interaction item was 0.99 (0.19-5.28). Smoking, hOGG1 Cys/Cys, p53 Pro/Pro and their interactions may be the important factors leading to the development of lung cancer.     

CYP1A1、GSTM1基因多态性与肺癌易感性的研究

目的:探讨CYP1A1、GSTM1基因多态性与肺癌易感性之间的相关性。方法:利用RFLP-PCR(限制性片段长度多态性-聚合酶链反应)方法检测65例原发性肺癌和60例非肿瘤患者CYP1A1、GSTM1基因,再用NcoI及HinfI两种内切酶识别CYP1A1等位基因亚型。结果:1)肺癌组与对照组CYP1A1等位基因型Ile/Ile、Ile/Val、Val/Val的频率总体分布无显著性差异;但肺癌组CYP1A1(Val/Val)基因型频率(18.5%)明显高于对照组(8.3%),两组差异有显著性(P<0.05)。2)肺癌组GSTM1(-)基因型的频率(63.1%)明显高于对照组(45.0%),P<0.05。3)两种等位基因联合分析发现,与携带CYP1A1(Ile/Ile)/GSTM1(+)基因型的个体相比:CYP1A1(Ile/Ile)/GSTM1(-)以及CYP1A1(Ile/Val+Val/Val)/GSTM1(+)基因型个体患肺癌的风险度较高,OR分别为3.82(95.0%CI,1.27～11.45)和3.5(95.0%CI,1.18～10.41);而CYP1A1(Val/Val)/GSTM1(-)基因型个体患肺癌的风险度最高,OR为10.5(95.0%CI,1.70～64.73)。4)进一步分层分析发现,CYP1A1(Ile/Val+Val/Val)等位基因型主要增加鳞癌的危险性;而GSTM1基因型组织类型无明显的相关性。5)在分析吸烟对肺癌易感性的影响时发现,CYP1A1(Ile/Val+Val/Val)及GSTM1(-)等位基因型与吸烟有协同作用,并与至发病时的累积吸烟量有关。结论:CYP1A1(Val/Val     

rs9904341多态性与肺癌易感性和铂类药物化疗敏感性的相关性

[目的]探讨survivin基因启动子区rs9904341位点多态性与肺癌发生风险和晚期非小细胞肺癌(NSCLC)患者铂类药物化疗疗效的关系。[方法]通过聚合酶链反应—限制性酶切片断多态性方法(PCR-RFLP)检测289例健康对照组和289例肺癌患者的rs9904341多态性的基因型;其中130例晚期NSCLC仅接受铂类药物化疗,分析经2个周期化疗后的疗效及基因型与铂类药物化疗疗效和生存期的关系。[结果]基因型CC、CG、GG在肺癌组的分布频率分别为29.07%、47.05%、23.87%,在对照组的分布频率分别为20.42%、51.9%、27.68%,两组无显著性差异(P=0.053)。肺癌组中C等位基因和CC基因型的分布均显著高于对照组(P<0.05)。rs9904341多态性与晚期NSCLC患者铂类药物化疗有效率无显著相关性,但与临床受益率相关,GG基因型携带者的临床受益率是CC基因型者的2.06倍(95%CI:0.71～5.97,P=0.184)。对289例肺癌患者生存分析显示,CC基因型肺癌患者较CG+GG基因型预后差(95%CI:1.11～2.6,P=0.015)。[结论]rs9904341多态性与肺癌的发病风险、预后及晚期NSCLC患者铂类药物化疗临床受益率相关。     

非小细胞肺癌患者hOGG1基因启动子区域突变的研究

背景与目的 8-羟基鸟嘌呤DNA糖苷酶(8-hydroxygumine DNA glycosylase1,OGG1)是一种DNA修复酶,可以从DNA切除修复8-羟基鸟嘌呤(8-dihydro-8-oxoguanine,8-OH-G)。人类OGG1基因(hOGG1)的多态性可能会改变酶的活性而影响个体修复损伤DNA的能力,促进癌变。然而,hOGG1基因启动子区域的突变与非小细胞肺癌(non-small cell lung cancer,NSCLC)的关系尚不明晰。我们拟探讨hOGG1基因启动子区域的突变与NSCLC发生发展的潜在关系。方法选取苏州大学附属第一医院2003年1月-2005年12月新鲜手术切除的40例NSCLC组织标本,采用PCR-SSCP和直接测序的方法检测NSCLC及其对应的癌旁组织中hOGG1基因启动子区域的突变。结果在40例NSCLC患者中未发现hOGG1基因启动子区域的异常突变,但发现单核苷酸多态位点rs159153与TNM分期明显相关(P=0.008);同时发现吸烟者中淋巴结转移率明显较低(P=0.034)。结论单核苷酸多态位点rs159153和吸烟史可能对NSCLC的侵袭和转移潜在性提供预测。     

XRCC1基因G28152A多态与肺癌风险的研究

背景与目的 :研究碱基切除修复基因XRCC1基因G28152A单核苷酸多态与肺癌风险的关系。材料与方法 :以病例_对照研究方法 ,采用聚合酶链反应一限制性片段长度多态性法检测肺癌病例(n=149)和按性别、年龄频数匹配的正常对照(n=157)XRCC1基因G28152A多态 ,分析各基因型与肺癌易感性的关系。 结果 :肺癌患者中 ,XRCC1基因28152AA突变基因型频率为15.4 % ,高于对照组7.6 % ;此基因型个体发生肺癌风险是其他基因型个体的2.2倍(95 %CI1.06～4.61)。 结论 :XRCC1基因G28152A多态可能在肺癌发生中起一定作用。     

CYP1A1 GSTM1基因多态性和吸烟与肺癌易感性关系的病例对照研究

目的:探讨天津市居民致癌物代谢酶CYP1A1和GSTM1基因多态性对肺癌易感性的影响。方法:利用限制性片断长度多态性-聚合酶链反应(RFLP-PCR)方法检测原发性肺癌患者和健康对照者细胞色素P450酶基因CYP1A1Msp位点和谷胱甘肽硫转移酶基因GSTM1的多态性情况。结果:肺癌组与对照组之间CYP1A1和GSTM1基因型分布差异均存在统计学显著意义(P<0.05)。携带CYP1A1变异基因型或GSTM1阴性基因型的个体患肺癌的危险性增高,比值比(OR)分别达到2.44(1.04～5.81)和1.84(1.03～3.29)。多因素分析结果显示具有CYP1A1变异基因型、GSTM1阴性基因型的吸烟个体患肺癌的风险较大。结论:CYP1A1Msp位点变异基因型和GSTM1阴性基因型可能是肺癌的易感因素,吸烟与肺癌易感基因之间具有协同作用。     

hOGG1基因Ser326Cys多态性与肺癌易感性的meta分析研究

背景与目的就全世界范围内而言,肺癌是一种常见疾病。人8-羟基鸟嘌呤糖苷酶(human8-hydrox-yguanine glycosylase,hOGG1)是一种DNA修复酶,它能特异切除8-羟基鸟嘌呤(8-dihydro-8-oxoguanine,8-OH-G),对损伤的DNA进行修复。hOGG1Ser326Cys基因多态性与癌症易感性的关系一直是研究的热点,而该多态性与肺癌易感性的关系尚存在争议。本研究采用meta分析旨在更好地探讨hOGG1Ser326Cys多态性与肺癌易感性之间的关系。方法使用MEDLINE数据库检索2010年11月以前的相关文献,按照纳入标准,全面搜索含有研究hOGG1Ser326Cys多态性与肺癌易感性相关的信息。由至少两位评论员做独立文献筛选和资料提取,并交叉审核。使用STATA10.1软件进行统计分析。结果根据检索条件,共有22篇文献(包括8,575例肺癌患者和9,484名正常对照个体)被纳入当前的meta分析。分析结果表明22项研究的结果存在明显异质性,当排除不符合Hard-Weinberg平衡定律的两篇文献后,其余的文献呈现出较好的同质性。与hOGG1Ser326相比,Cy...