目的:人类着色性干皮病基因D(XPD)是核苷酸切除修复途径中的关键基因之一,其单核苷酸多态(SNP)与肺癌的遗传易感性相关联,但研究结论不一,本研究拟采用Meta分析的方法对2000—2014年间发表的相关文献进行综合,评价XPD基因751位点SNP与...目的:人类着色性干皮病基因D(XPD)是核苷酸切除修复途径中的关键基因之一,其单核苷酸多态(SNP)与肺癌的遗传易感性相关联,但研究结论不一,本研究拟采用Meta分析的方法对2000—2014年间发表的相关文献进行综合,评价XPD基因751位点SNP与肺癌遗传易感性的关联。方法:检索PubMed、CNKI(中国知网)、cqVIP(维普资讯网)、万方全文数据库中关于XPD基因Lys751Gln位点多态与肺癌遗传易感性关联的病例对照研究。按照拟定标准筛查并纳入符合标准的文献,采用Rev Man 4.2软件对入选文献进行异质性检验,计算合并相对危险度(OR值)及其95%可信区间(95%CI),同时绘制漏斗图,估计发表偏倚的影响。结果:共纳入28篇国内外文献,累计病例9 012例,对照10 542例,杂合基因型Lys/Gln与野生基因型Lys/Lys相比较,采用随机效应模型计算合并OR值为1.18,95%CI(1.07,1.31),P=0.001;突变基因型Gln/Gln与野生基因型Lys/Lys相比较,采用固定效应模型分析计算合并OR值为1.28,95%CI(1.14,1.44),P<0.01。亚组分析结果显示高加索人群中,XPD基因751位点多态与肺癌遗传易感性相关联。结论:XPD基因751位点Gln/Lys和Gln/Gln基因型的个体,其肺癌发病风险显著增加。展开更多
目的:探讨野生型X P D基因对人胆管癌QBC939细胞的生物学影响.方法:用碱裂解法提取空载质粒pEGFP-N2和重组质粒pEGFP-N2-XPD,提取出的质粒以KPNⅠ、BGIⅡ和SPHⅠ酶切鉴定.实验分4组,重组质粒pEGFP-N2-XPD组、空载质粒pEGFP-N2组、脂质体...目的:探讨野生型X P D基因对人胆管癌QBC939细胞的生物学影响.方法:用碱裂解法提取空载质粒pEGFP-N2和重组质粒pEGFP-N2-XPD,提取出的质粒以KPNⅠ、BGIⅡ和SPHⅠ酶切鉴定.实验分4组,重组质粒pEGFP-N2-XPD组、空载质粒pEGFP-N2组、脂质体组,并用具有相同遗传背景和代数的QBC939细胞作为空白对照.用脂质体转染法瞬时转染四组细胞.荧光显微镜下观察转染后绿色荧光蛋白报告基因表达情况.提取各组细胞总RNA,合成cDNA,用聚合酶链反应(PCR)检测4组细胞中XPD、p53、cyclin D1、c-myc表达情况.并用四甲基偶氮唑盐(MTT)和流式细胞仪检测细胞增殖及其细胞周期的变化.结果:pEGFP-N2-XPD细胞与pEGFP-N2、脂质体组和空白对照组相比,XPD mRNA表达量明显增加(0.778±0.018vs0.561±0.039,0.544±0.035,0.542±0.034,均P<0.01).pEGFP-N2-XPD细胞中p53mRNA相对表达量与pEGFP-N2、脂质体组和空白对照组比较具有统计学意义(0.421±0.019vs0.256±0.014,0.267±0.015,0.274±0.018,均P<0.01).pEGFP-N2-XPD细胞与其他组相比,cyclin D1mRNA相对表达量明显降低(0.339±0.041vs0.560±0.039,0.558±0.050,0.560±0.041,均P<0.01).pEGFP-N2-XPD细胞与其他组相比,c-myc mRNA相对表达量明显降低(0.355±0.045vs0.570±0.075,0.560±0.041,0.537±0.050,均P<0.01).流式细胞仪检测pEGFP-N2-XPD组细胞周期G1期为81.65%,S期为11.83%,其他组Gl期分别为65.54%、56.61%、63.26%;S期分别为24.10%、29.52%、27.28%,结果具有统计学意义(P<0.05).MTT检测示pEGFP-N2-XPD细胞生长率为0.249±0.02,与其他组相比,细胞增殖力明显减弱(P<0.01).结论:野生型XPD基因可以抑制胆管癌细胞的生长,XPD基因可抑制c-myc、cyclin D1基因的表达,增加p53基因表达.展开更多
着色性干皮病D组蛋白(Xeroderma pigmentosum group D,XPD)是基础转录因子ⅡH(Transcript factorⅡH,TFⅡH)复合体的第二大亚基,它在转录和核苷酸剪切修复过程中都发挥着重要作用。我们利用人宫颈鳞癌上皮细胞(HeLa细胞)中提取的总RNA...着色性干皮病D组蛋白(Xeroderma pigmentosum group D,XPD)是基础转录因子ⅡH(Transcript factorⅡH,TFⅡH)复合体的第二大亚基,它在转录和核苷酸剪切修复过程中都发挥着重要作用。我们利用人宫颈鳞癌上皮细胞(HeLa细胞)中提取的总RNA进行逆转录酶-聚合酶链反应(Reverse transcriptase-polymerase chain reac-tion,RT-PCR),克隆出人全长XPD cDNA,把此基因按野生型插入表达绿色荧光蛋白的pEGFP-N2质粒,构建了pEGFP-N2/XPD重组体质粒,并将其转染入整合有乙肝病毒X蛋白(Hepatitis B virus X protein,HBx)的人肝癌细胞Hep3B,分析重组细胞的XPD表达水平、HBx表达水平和细胞增殖力,为进一步研究XPD的各种生物学活性及作用机制奠定了基础。展开更多
BACKGROUND The xeroderma pigmentosum group G(XPG)gene at chromosome 13q33 consists of 15 exons,which may be related to the occurrence and development of gastric cancer(GC).AIM To examine the association of several com...BACKGROUND The xeroderma pigmentosum group G(XPG)gene at chromosome 13q33 consists of 15 exons,which may be related to the occurrence and development of gastric cancer(GC).AIM To examine the association of several common single nucleotide polymorphisms(SNPs)of the XPG gene with GC risk and survival.METHODS Five SNPs of XPG(rs2094258,rs751402,rs873601,rs2296147,and rs1047768)were genotyped by PCR restriction fragment length polymorphism in 956 histologically confirmed GC cases and 1012 controls in North China.GC patients were followed for survival status and,if deceased,cause of death.Logistic regression and Cox regression were used for analysing associations of XPG SNPs with risk of GC and prognosis,respectively.For rs2094258,heterozygous model(CT vs CC),homozygous model(TT vs CC),recessive model(TT vs CT+CC),and dominant model(TT+CT vs CC)were analyzed.RESULTS None of the examined loci were statistically associated with GC risk,although rs2296147 was marginally associated with GC risk(P=0.050).GC patients with the rs2094258 CT+CC genotype showed worse survival than those with the TT genotype(log-rank test,P=0.028),and patients with the CC genotype had a tendency of unfavourable prognosis compared with those with the TT+CT genotype(log-rank test,P=0.039).The increase in C alleles of rs2094258[hazard ratio(HR)=1.19,95%confidence interval(CI):1.02-1.45,P=0.037]were associated with the long-term survival of GC cases.Other risk factors for survival included tumor differentiation(HR=4.51,95%CI:1.99-8.23,P<0.001),lymphovascular invasion(HR=1.97,95%CI:1.44-3.01,P<0.001),and use of chemotherapy(HR=0.81,95%CI:0.63-0.98,P=0.041).CONCLUSION The XPG rs2094258 polymorphism may be associated with overall survival in GC patients.展开更多
Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy...Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy. We prospectively assessed the status of the XPC Ala499Val and Lys939GIn gene polymorphisms and investigated whether these SNPs can predict the response to cisplatin/carboplatin-based regimens in advanced NSCLC patients in a Chinese population.Methods The treatment outcomes of 96 advanced NSCLC patients who were treated with platinum-based chemotherapy were evaluated. The polymorphic status of xeroderma pigmentosum group C （XPC） gene was genotyped by the 3-D polyacrylamide gel-based DNA microarray method.Results The distributions of XPC Lys939GIn genotypes differed significantly between the response group （complete ＋partial responses） and the non-response group （stable ＋ progressive disease; P=0.022）. The heterozygous A/C genotype carriers had a poorer response rate than the wild A/A genotype carriers in stage Ⅲ （OR, 0.074; 95% CI,0.008-0.704; P=0.023）. The XPC Ala499Val polymorphisms were not associated with response to platinum-based chemotherapy.Conclusion Polymorphisms of the XPC gene, Lys939GIn, may be a predictive marker of treatment response for advanced NSCLC patients in stage Ⅲ.展开更多
文摘目的:人类着色性干皮病基因D(XPD)是核苷酸切除修复途径中的关键基因之一,其单核苷酸多态(SNP)与肺癌的遗传易感性相关联,但研究结论不一,本研究拟采用Meta分析的方法对2000—2014年间发表的相关文献进行综合,评价XPD基因751位点SNP与肺癌遗传易感性的关联。方法:检索PubMed、CNKI(中国知网)、cqVIP(维普资讯网)、万方全文数据库中关于XPD基因Lys751Gln位点多态与肺癌遗传易感性关联的病例对照研究。按照拟定标准筛查并纳入符合标准的文献,采用Rev Man 4.2软件对入选文献进行异质性检验,计算合并相对危险度(OR值)及其95%可信区间(95%CI),同时绘制漏斗图,估计发表偏倚的影响。结果:共纳入28篇国内外文献,累计病例9 012例,对照10 542例,杂合基因型Lys/Gln与野生基因型Lys/Lys相比较,采用随机效应模型计算合并OR值为1.18,95%CI(1.07,1.31),P=0.001;突变基因型Gln/Gln与野生基因型Lys/Lys相比较,采用固定效应模型分析计算合并OR值为1.28,95%CI(1.14,1.44),P<0.01。亚组分析结果显示高加索人群中,XPD基因751位点多态与肺癌遗传易感性相关联。结论:XPD基因751位点Gln/Lys和Gln/Gln基因型的个体,其肺癌发病风险显著增加。
文摘着色性干皮病D组蛋白(Xeroderma pigmentosum group D,XPD)是基础转录因子ⅡH(Transcript factorⅡH,TFⅡH)复合体的第二大亚基,它在转录和核苷酸剪切修复过程中都发挥着重要作用。我们利用人宫颈鳞癌上皮细胞(HeLa细胞)中提取的总RNA进行逆转录酶-聚合酶链反应(Reverse transcriptase-polymerase chain reac-tion,RT-PCR),克隆出人全长XPD cDNA,把此基因按野生型插入表达绿色荧光蛋白的pEGFP-N2质粒,构建了pEGFP-N2/XPD重组体质粒,并将其转染入整合有乙肝病毒X蛋白(Hepatitis B virus X protein,HBx)的人肝癌细胞Hep3B,分析重组细胞的XPD表达水平、HBx表达水平和细胞增殖力,为进一步研究XPD的各种生物学活性及作用机制奠定了基础。
基金Supported by the Fundamental Research Funds for the Central Universities,No.zdyf2017007
文摘BACKGROUND The xeroderma pigmentosum group G(XPG)gene at chromosome 13q33 consists of 15 exons,which may be related to the occurrence and development of gastric cancer(GC).AIM To examine the association of several common single nucleotide polymorphisms(SNPs)of the XPG gene with GC risk and survival.METHODS Five SNPs of XPG(rs2094258,rs751402,rs873601,rs2296147,and rs1047768)were genotyped by PCR restriction fragment length polymorphism in 956 histologically confirmed GC cases and 1012 controls in North China.GC patients were followed for survival status and,if deceased,cause of death.Logistic regression and Cox regression were used for analysing associations of XPG SNPs with risk of GC and prognosis,respectively.For rs2094258,heterozygous model(CT vs CC),homozygous model(TT vs CC),recessive model(TT vs CT+CC),and dominant model(TT+CT vs CC)were analyzed.RESULTS None of the examined loci were statistically associated with GC risk,although rs2296147 was marginally associated with GC risk(P=0.050).GC patients with the rs2094258 CT+CC genotype showed worse survival than those with the TT genotype(log-rank test,P=0.028),and patients with the CC genotype had a tendency of unfavourable prognosis compared with those with the TT+CT genotype(log-rank test,P=0.039).The increase in C alleles of rs2094258[hazard ratio(HR)=1.19,95%confidence interval(CI):1.02-1.45,P=0.037]were associated with the long-term survival of GC cases.Other risk factors for survival included tumor differentiation(HR=4.51,95%CI:1.99-8.23,P<0.001),lymphovascular invasion(HR=1.97,95%CI:1.44-3.01,P<0.001),and use of chemotherapy(HR=0.81,95%CI:0.63-0.98,P=0.041).CONCLUSION The XPG rs2094258 polymorphism may be associated with overall survival in GC patients.
基金This work was supported by the grants from the Prophase Force-Study Program of the Jiangsu Province Natural Science Foundation （No. BK2005203）, the Medical Science Technology Research ＂Eleventh Five-Year＂ Program of the People＇s Liberation Army （No. 06MAlll）, and the Focal Project of Nanjing Medical Technology Development （No. ZKX05030）.
文摘Background Platinum-based chemotherapeutics are the most common regimens for advanced non-small-cell lung cancer （NSCLC） patients, and genetic factors are thought to represent important determinants of drug efficacy. We prospectively assessed the status of the XPC Ala499Val and Lys939GIn gene polymorphisms and investigated whether these SNPs can predict the response to cisplatin/carboplatin-based regimens in advanced NSCLC patients in a Chinese population.Methods The treatment outcomes of 96 advanced NSCLC patients who were treated with platinum-based chemotherapy were evaluated. The polymorphic status of xeroderma pigmentosum group C （XPC） gene was genotyped by the 3-D polyacrylamide gel-based DNA microarray method.Results The distributions of XPC Lys939GIn genotypes differed significantly between the response group （complete ＋partial responses） and the non-response group （stable ＋ progressive disease; P=0.022）. The heterozygous A/C genotype carriers had a poorer response rate than the wild A/A genotype carriers in stage Ⅲ （OR, 0.074; 95% CI,0.008-0.704; P=0.023）. The XPC Ala499Val polymorphisms were not associated with response to platinum-based chemotherapy.Conclusion Polymorphisms of the XPC gene, Lys939GIn, may be a predictive marker of treatment response for advanced NSCLC patients in stage Ⅲ.
