CYP1A1及GSTP1基因多态性与肺癌易感性关系

目的 探讨细胞色素P4501 A1(CYP1A1) Exon7和谷胱甘肽硫转移酶P1(GSTPI) Ile105 Val基因多态性与内蒙古地区汉族人群肺癌易感性关系.方法 采用等位基因特异性扩增法分析216例汉族对照人群和116例肺癌患者CYP1A1 Exon7和GSTP1 Ile105 Val基因多态性.结果 携带CYP1A1 Exon7突变杂合型和纯合型的个体患肺癌的危险均升高(OR值分别为1.460和1.593),而携带GSTP1 Ile105 Val突变杂合型和纯合型的个体患肺癌的风险均降低(OR值分别为0.970和0.602);CYP1 A1 Exon7和GSTP1 Ile105 Val基因在肺癌易感性方面无协同作用;CYP1A1 Exon7与吸烟有协同作用(OR=2.637,95％ CI=1.056～6.530,P=0.032),GSTP1 Ile105Val与吸烟无协同作用.结论 CYP1 A1 Exon7突变基因型为肺癌的可疑易感因素,CYP1A1 Exon7突变基因型和吸烟对肺癌易感有协同作用,GSTP1 Ile105Val突变基因型可降低肺癌易感性.     

CYP1A1 Ile462Val多态与小细胞肺癌遗传易感性相关

目的探讨细胞色素P450 1A1(CYP1A1)基因Ile462Val单核苷酸多态与小细胞肺癌遗传易感性的相关关系。方法收集275例小细胞肺癌患者和406例正常对照者的外周静脉血标本,采用聚合酶链反应-限制性片断长度多态性分析(PCRRFLP)技术检测CYP1A1基因Ile462Val多态的基因型。采用多变量Logistic回归方法分析不同基因型与小细胞肺癌发病风险的相关关系。结果与CYP1A1 462 Ile/Ile基因型携带者相比,462 Ile/Val和462 Val/Val基因型携带者小细胞肺癌发病风险显著降低,其OR值分别为0.65(95%CI 0.48~0.91)和0.60(95%CI 0.32~0.97)。吸烟分层分析显示,在不吸烟人群中,462 Ile/Val或462 Val/Val基因型携带者小细胞肺癌发病风险的OR值为0.99(95%CI 0.62~1.51)。在吸烟人群中,462Ile/Val或462 Val/Val基因型携带者小细胞肺癌发病风险的OR值为0.42(95%CI0.26~0.65)。此外,在轻度吸烟者和重度吸烟者中462 Ile/Val或462 Val/Val基因型携带者小细胞肺癌发病风险的OR值分别为0.42(95%CI 0.21~0.85)和0.44(95%CI 0.24~0.82)。结论 CYP1A1基因Ile462Val多态与小细胞肺癌遗传易感性相关。     

某铀矿工人痰细胞中p16和MGMT基因的甲基化状态

目的检测某铀矿氡职业暴露人群痰细胞中6-氧-甲基嘌呤-DNA甲基转移酶（MGMT）基因和p16基因的甲基化状态，为寻找氡致肺癌高危人群的分子标记物提供试验依据。方法91名氡职业暴露工人按氡子体累积暴露剂培工作水平月（WLM）分为高（〉120WLM）、中（60～120WIN）、低（30～60WLM）和较低（2～30WLM）4个剂量组，用聚合酶链反应-甲基化特异性（MSP）检测4组人群痰细胞中的p16和MGMT基因的异常甲基化状态。结果随着氡子体累积暴露剂量的增加，p16基因甲基化率（0．00％，20．00％）、MGMT基因甲基化率（0．00％～28．00％）、总甲基化率（0．00％～40．00％）均呈明昆上升趋势，差异有统计学意义（P〈0．01）。结论p16和MGMT基因甲基化与氡子体累积暴露剂量有关。     

细胞色素P4501A1基因多态性与食管癌易感性关系的Meta分析

目的 探讨细胞色素P4501A1(CYP1A1)MspI和Ile/Val位点基因多态性与食管癌发生的关系.方法 采用Meta分析方法,对国内外1997-2008年采用病例对照方法研究CYP1A1MspI和Ile/Val基因多态性与食管癌发生关系的16篇(MspI 8篇,Ile/Val 14篇)文献,采用显性模型(即突变基因型与野生型比较)进行综合定量分析,然后按病理分型(鳞癌/腺癌)分亚组进行分析.结果 综合分析CYP1A1 MspI突变基因型(TC+CC)与食管癌发生无统计学关联(OR=1.17,95%CI:0.82～1.66),亚组分析亦未发现CYP1A1 MspI突变基因型与食管鳞癌(OR=1.17,95%CI:0.82～1.69)和食管腺癌(OR=1.39,95%CI:0.67～2.09)的统计学关联;携带CYP1A1突变基因型(Ile/Val+Val/Val)的个体发生食管癌的危险性是野生型的1.39倍(OR=1.39,95%CI:1.07～1.80);亚组分析显示突变基因型与食管鳞癌发生的易感性相关但与食管腺癌无关联,OR值分别为1.43(95%CI:1.07～1.91)和1.20(95%CI:0.62～2.30).结论 CYP1A1 Ile/Val位点突变基因型可增加食管鳞癌发生的危险性,CYP1A1 MspI位点基因多态性与食管癌无关联.     

燃煤污染型砷中毒人群MGMT基因甲基化、转录及表达的研究

目的了解O6-甲基鸟嘌呤DNA甲基转移酶基因(MGMT基因)启动子区甲基化、转录及表达以及DNA甲基转移酶1(DNMT1)的转录及表达与砷中毒的关系。方法采集68例燃煤污染型砷中毒(以下简称砷中毒)患者(轻度24例、中度28例、重度16例)及23例非病区居民外周血。用甲基化特异性PCR法(MSP)检测MGMT基因启动子区甲基化,实时荧光定量PCR(FQ-PCR)法检测MGMT及DNMT1 mRNA的水平。利用自愿手术治疗的砷中毒患者皮肤组织标本(61例,其中34例为一般病变,21例为癌前病变,6例为癌变)和对照皮肤组织标本(15例),以免疫组织化学(IHC)法检测砷中毒患者及对照皮肤组织中MGMT及DNMT1蛋白的表达。结果 MGMT基因启动子区甲基化阳性率与砷中毒程度有关(χ2=13.739,P0.01)。砷中毒组MGMT mRNA表达水平与对照组比较,差异无统计学意义(P0.05);MGMT基因启动子区甲基化患者和非甲基化患者之间MGMT mRNA和DNMT1 mRNA表达差异无统计学意义(P0.05)。但轻、中度患者DNMT1 mRNA表达明显低于对照组(P0.01);癌前病变组和癌变组皮肤组织中MGMT蛋白表达明显低于对照组(P0.01),与皮肤损害程度有关(rs=-0.446,P0.01);MGMT基因启动子区甲基化患者MGMT蛋白表达明显低于非甲基化组(P0.05)。砷中毒组皮肤组织中DNMT1蛋白表达强于对照组(P0.01),并与皮肤损害程度有关(rs=0.740,P0.01);且MGMT基因启动子区甲基化患者组织中DNMT1蛋白表达明显高于非甲基化组(P0.05)。结论 MGMT基因启动子区高甲基化抑制了燃煤污染型砷中毒患者皮肤组织中MGMT蛋白的表达,且DNMT1蛋白的高表达参与了此抑制过程。     

广东省梅州地区客家人群GSTP1和GSTM1基因多态性研究

目的了解谷胱甘肽硫转移酶P1(GSTP1)、M1(GSTM1)基因多态性在广东梅州地区人群中的分布规律.方法采用聚合酶链式反应-限制性酶切片段长度多态性(PCR-RFLP)方法和以β-Globin为内对照的双重PCR法分别检测广东省梅州地区512名健康客家居民GSTP1和GSTM1基因型.结果调查人群GSTP1基因3种基因型GSTP1 A/A、GSTP1A/G、GSTP1 G/G分布频率分别为69.1%,28.2%,2.7%;GSTM1基因缺失型分布频率为62.1%;GSTM1基因在饮酒人群与不饮酒人群中的分布差异有统计学意义(P＜0.05),GSTP1基因在吸烟与不吸烟人群中的分布差异有统计学意义(P＜0.01),吸烟人群中GSTP1 A/A基因型分布频率较低(62.5%),GSTP1 A/G基因型分布频率较低(29.2%),GSTP1 G/G基因型分布频率较高(8.3%).GSTM1基因型分布与高血压家族史有相关性(OR=1.868,95%CI 1.119～3.119).结论 GSTP1基因多态性在广东梅州地区吸烟与不吸烟客家人群中分布有差异,GSTM1在广东梅州地区饮酒与不饮酒客家人群中分布有差异,GSTM1基因型分布与高血压家族史有相关性.     

CYP1A1基因多态性与肺癌个体易感性研究

[目的 ]探讨CYP1A1Msp1和Ile/Val多态性单独或联合作用 ,对肺癌易感性的影响。 [方法 ]以病例一对照研究的方法 ,采用PCR扩增限制酶切法 (PCR -RFLP)和等位基因特异性扩增 (Allele SpecificAmplification ,ASA)检测 92例肺癌病人 (病例组 )和 98例非肿瘤病人 (对照组 )CYP1A1基因Msp1和Ile/Val基因型。 [结果 ]Msp1多态性位点 :具有B和C基因型者患肺癌的危险性是A基因型者的 1 85倍 (χ2 =4 3 6,P <0 0 5 ,OR =1 85 ,95 %CI 1 0 4～ 3 3 0 )。Ile/Val多态性位点 :Val/Val基因型者患肺癌的危险性是Ile/Ile基因型者的 3 3倍 (χ2 =4 12 ,P <0 0 5 ,OR =3 3 ,95 %CI 1 0 2～10 72 )。Ile/Val基因型联合B基因型、C基因型或Val/Val基因型联合C基因型与Ile/Ile基因型联合A基因型相比 ,患肺癌的危险性增加 ,其相对危险度分别为 3 0 9(χ2 =5 81,P <0 0 5 ,95 %CI 1 7～ 9 96) ;4 74(χ2 =4 74,P <0 0 5 ,95 %CI1 11～ 2 0 9) ;5 5 (χ2 =4 42 ,P <0 0 5 ,95 %CI 1 2 7～ 2 3 6)。 [结论 ]CYP1A1基因的B、C和Val/Val基因型可能是肺癌的易感基因型 ,两种易感基因型同时存在 ,更增加对肺癌的易感性     

GSTT1及CYP1A1基因多态性与肺癌易感性关系

目的 探讨细胞色素P4501A1(CYP1A1)和谷胱甘肽硫转移酶T1(GSTT1)基因多态性与肺癌易感性的关系.方法 用等位特异性PCR(AS-PCR)及多重PCR技术分析106例肺癌患者和250名健康人的CYP1A1、GSTT1基因多态性、基因型分布频率和交互作用.结果 携带CYP1A1(Val/Val)/GSTT1(-)基因型的人患肺癌的风险明显增加(P=0.025);吸烟与肺癌易感性有关(P=0.037),吸烟者患肺癌的风险明显增加(OR=1.628.95%CI=1.028～2.577);携带CYP1A1(Val/Val)基因的吸烟者较携带CYP1A1(Ile/Ile)基因型的不吸烟者易患肺癌(P=0.033);携带GSTT1(-)的吸烟者患肺癌的风险明显增加(P=0.045).结论 CYP1A1突变型和GSTT1(-)基因型是肺癌的可疑易患因素,二者对肺癌的发生有协同作用,但单独携带CYP1A1突变型或GSTT1(-)基因型肺癌易感性差异无统计学意义,吸烟与肺癌易感性有关;CYP1A1突变型、GSTT1(-)基因型与吸烟在肺癌的发生上有相互促进作用.     

中国汉族人群5,10-亚甲基四氢叶酸还原酶基因多态性与非综合征性唇腭裂关系的Meta分析

目的评价中国汉族人群5,10-亚甲基四氢叶酸还原酶基因(MTHFR)C677T多态性与非综合征性唇腭裂(NSCL/P)易感性的关系。方法计算机检索中国学术期刊全文数据库、中国生物医学文献数据库、万方学术期刊数据库等,选择MTHFR基因C677T多态性与NSCL/P易感性有关的病例对照研究。采用Rev Man 5.1软件进行统计分析。结果共纳入研究5项包括1 598例研究对象。Meta分析结果显示,在中国汉族人群中,除携带突变纯合子(TT)基因的个体罹患NSCL/P的风险高于携带野生纯合子(CC)的个体(OR=1.69,95%CI 1.19~2.41)外,其他基因模型均不具有统计学意义(T vs.C:OR=1.26,95%CI 0.95~1.67;CT vs.CC:OR=1.54,95%CI 0.91~2.61;CT+TT vs.CC:OR=1.56,95%CI 0.92~2.64;TT vs.CC+TT:OR=1.27,95%CI 0.94~1.73)。结论 MTHFR基因C677T多态性是中国汉族人群发生非综合征性唇腭裂的潜在危险因素,仅携带突变纯合子(TT)基因的个体会增加罹患NSCL/P的风险。     

XRCC1、hOGG1和MGMT基因多态性与氯乙烯接触工人染色体损伤的关系

[目的]探讨DNA损伤修复基因X线修复交叉互补基因（1X-ray repair cross complementing gene 1,XRCC1）、人8-羟基鸟苷糖苷酶1基因（human 8-oxoguanine DNA glycosylase-1,hOGG1）以及O6-甲基鸟嘌呤-DNA甲基转移酶基因（O6-methyl-guanine DNA methyltransferase,MGMT）的多态性与氯乙烯致人外周血淋巴细胞染色体损伤的关系。[方法]采用胞质阻滞微核试验方法（CBMN）评价313名氯乙烯接触工人和141名对照工人染色体损伤水平,应用聚合酶链反应-限制性片段多态性技术（polymerase chain reaction-restriction fragment length polymorphism,PCR-RFLP）对接触工人XRCC1基因Arg194Trp、Arg280His和Arg399Gln 3个位点和hOGG1基因Ser326Cys位点及MGMT基因Leu84Phe位点进行多态性检测。采用SAS软件包进行统计分析,计算率比（frequency ratio,FR）及其95%可信限（95%confidence interval,95%CI）。[结果]本研究表明,氯乙烯接触工人的微核率为（4.86±2.80）‰,显著高于对照人群的微核率（1.22±1.24）‰（P〈0.01）。携带hOGG1 326 Ser/Cys基因型（FR=1.21,95%CI：1.02~1.46;P〈0.05）、XRCC1 194Arg/Trp基因型（FR=1.12,95%CI：1.00~1.25;P〈0.05）和XRCC1 280 Arg/His和His/His基因型（FR=1.12,95%CI：1.00~1.26;P〈0.05）的个体均易发生染色体损伤。在易感性的双体型中,携带CGA/CAG的个体相比携带野生型CGG/CGG的个体微核率明显升高（FR=1.67,95%CI：1.19~2.23;P〈0.05）。接触组人群的微核率随着年龄的增长显著升高（FR=1.13,95%CI：1.00~1.28;P〈0.05）。对XRCC1基因型进行联合分析,发现随着剂量增加和携带突变等位基因数目增多,其染色体损伤风险增大。[结论]胞质阻滞微核可以作为氯乙烯接触工人早期健康损害的敏感指标,基因型XRCC1 Arg194Trp、Arg280His、hOGG1 Ser326Cys和双体型CGA/CAG以及年龄增长可能对氯乙烯致工人染色体损伤的过程产生影响。氯乙烯累积接触水平与XRCC1基因型也可能存在一定的交互作用。     

Pooled analysis and meta-analysis of the glutathione S-transferase P1 Ile 105Val polymorphism and bladder cancer: a HuGE-GSEC review

The glutathione S-transferase P1 genotype (GSTP1) is involved in the inactivation of cigarette smoke carcinogens, and sequence variation in the gene may alter bladder cancer susceptibility. To examine the association between GSTP1Ile 105Val and bladder cancer, the authors undertook a meta- and pooled analysis. Summary crude and adjusted odds ratios and corresponding 95% confidence intervals were pooled by using a random-effects model. In the meta-analysis (16 studies, 4,273 cases and 5,081 controls), the unadjusted summary odds ratios for GSTP1 Ile/Val and Val/Val compared with GSTP1 Ile/Ile were 1.54 (95% confidence interval: 1.21, 1.99; p < 0.001) and 2.17 (95% confidence interval: 1.27, 3.71; p = 0.005). The association appeared to be the strongest in Asian countries. When the analysis was limited to European descendents (nine studies), the summary odds ratio decreased (odds ratio = 1.24, 95% confidence interval: 1.00, 1.52) (Q = 17.50; p = 0.02). All relevant data previously contributed to the International Study on Genetic Susceptibility to Environmental Carcinogens were pooled (eight studies, 1,305 cases and 1,558 controls). The summary odds ratios were similar to the ones from the meta-analysis. Case-only analyses did not detect an interaction between the GSTP1 genotype and smoking status (never/ever). GSTP1 Ile 105Val appears to be associated with a modest increase in the risk of bladder cancer.     

Cruciferous vegetables, the GSTP1 Ile105Val genetic polymorphism, and breast cancer risk

BACKGROUND: Cruciferous vegetables are the primary source of isothiocyanates and other glucosinolate derivatives that are known to induce phase II detoxifying enzymes, including glutathione S-transferases (GSTs). OBJECTIVE: We investigated the independent and combined effects of cruciferous vegetable intake and the GSTP1 Ile(105)Val genetic polymorphism on breast cancer risk. DESIGN: Analyses included 3035 cases and 3037 population controls who were participating in the Shanghai Breast Cancer Study and for whom diet and genetic data were complete (87% of cases and 85% of controls). RESULTS: With the use of multivariate logistic regression, the GSTP1 Val/Val genotype was significantly associated with greater breast cancer risk (OR = 1.50; 95% CI: 1.12, 1.99). The association was significantly greater in premenopausal women (OR = 1.69; 95% CI: 1.17, 2.43) than in postmenopausal women (OR = 1.20; 95% CI: 0.74, 1.92). Total cruciferous vegetable intake was not significantly associated with breast cancer risk, although subjects reporting greater turnip (P for trend < 0.001) and Chinese cabbage (P for trend = 0.049) intakes had a significantly lower postmenopausal breast cancer risk. Women with the GSTP1 Val/Val genotype and low cruciferous vegetable intake had a breast cancer risk 1.74-fold (95% CI: 1.13, 2.67) that of women with the Ile/Ile or Ile/Val genotype. This effect of low cruciferous vegetable intake and the Val/Val genotype was seen predominantly among premenopausal women (OR = 2.08; 95% CI = 1.20, 3.59). CONCLUSIONS: Cruciferous vegetable intake consistent with high isothiocyanate exposure may reduce breast cancer risk. Cruciferous vegetable intake also may ameliorate the effects of the GSTP1 genotype.     

Aberrant promoter methylation of p16(INK4a) and O(6)-methylguanine-DNA methyltransferase genes in workers at a Chinese uranium mine

To find the possible association of gene methylation of p16(INK4a) and O(6)-Methylguanine-DNA Methyltransferase (O(6)-MGMT) with occupational exposure to radon, 91 male miners from a uranium mine in China were divided into 4 groups according to the cumulative doses of radon exposure from 2 to 425 WLM (working-level months), and aberrant promoter methylation of p16(INK4a) and O(6)-MGMT genes in sputum samples was determined by a specific PCR assay. The results revealed that the methylated rates of 16(INK4a) gene (z=2.844, P=0.005) and O(6)-MGMT gene (z=3.034, P=0.002), and the total methylated rate of these two genes (z=3.859, P=0.0001) increased significantly with the cumulative doses of radon among the miners. This methylation could be applied as a potential marker for the detection of early DNA damage induced by occupational radon exposure.     

Sweet Taste Receptor TAS1R2 Polymorphism (Val191Val) Is Associated with a Higher Carbohydrate Intake and Hypertriglyceridemia among the Population of West Mexico

Some high-carbohydrate diets may lead to obesity and multiple metabolic disorders, including hypertriglyceridemia (HTG). This lipid abnormality is considered an important risk factor for cardiovascular disease and type 2 diabetes. The sweet taste receptor TAS1R2 polymorphism (Ile191Val) has been reported to be associated with carbohydrate intake. The aim of this study was to analyze the association of the TAS1R2 gene polymorphism with carbohydrate intake and HTG among the population of West Mexico. In a cross-sectional study, 441 unrelated subjects were analyzed for TAS1R2 genotypes (Ile/Ile, Ile/Val and Val/Val) by an allelic discrimination assay. Biochemical tests and a three-day food record were assessed. The Val/Val genotype carriers had a higher intake of total carbohydrates, fiber and servings of cereals and vegetables than the other genotype carriers. The Val/Val genotype conferred a higher risk for HTG than the Ile/Val and Ile/Ile genotypes (OR = 3.26, 95%CI 1.35–7.86, p = 0.006 and OR = 2.61, 95%CI 1.12–6.07, p = 0.02, respectively). Furthermore, the Val/Val genotype was associated with approximately 30% higher triglycerides compared with Ile/Val and Ile/Ile genotypes (β = 44.09, 95%CI 9.94–78.25, p = 0.01 and β = 45.7, 95%CI 10.85–80.54, p = 0.01, respectively). In conclusion, the Val/Val genotype of TAS1R2 was associated with a higher carbohydrate intake and HTG.     

The influence of genetic polymorphisms of GSTP1 on the development of asbestosis

OBJECTIVE: Genetic factors play an important role in the development of asbestosis. The aim of this study was to investigate whether genetic polymorphisms of glutathione S-transferase (GST) P1 represent a risk factor for this disease. METHODS: The study population included 262 workers with asbestosis and 265 matched controls. Information on cumulative asbestos exposure was available. A real-time PCR based on the 5' nuclease assay was designed for the analysis of GSTP1 Ile105Val and Ala114Val polymorphisms. RESULTS: Asbestosis was associated with GSTP1 genotype coding for an enzyme with high conjugation capacity versus genotypes resulting in intermediate and low enzyme activity (odds ratio = 1.49, confidence interval = 1.06-2.10). CONCLUSIONS: The key finding of the study was that GSTP1 genotype coding for an enzyme with high conjugation capacity significantly increases the risk of developing asbestosis.     

联合分析XRCC1、XPD和GSTP1基因单核苷酸多态性在铂类药物化疗敏感性中的预测作用

目的 联合分析X线修复交叉互补基因1（X-rayCOrSS—complementing1,XRCCl）第194和399位点,着色性干皮病基因D（XerodermapigmentosumgroupD,XPD）第312位点及谷胱甘肽-s-转移酶P1基因（GlutathioneS-Transferasepl,GSTPl）第105位点的单核苷酸多态性（singlenucleotidepolymorphisms,SNPs）在预测铂类药物化疗敏感性中的作用。方法采用基因测序法对50例恶性肿瘤患者的外周血进行XRCCl、XPD和GSTPl基因单核苷酸多态性（SNPs）检测,分析各基因型与铂类药物化疗敏感性的关系。结果有效率高的基因型为：XRCC1194位点的Arg／Trp和Trp／Trp,XRCC1399位点的Arg／Arg,XPD312位点的Asn／Asn,GSTPl105位点的Val／Val,它们的化疗有效率分别为57．1％、75．0％、60．9％、85．7％、87．5％。有两个以上和有1个或0个高效基因型患者的化疗有效率分别是78．9％、36．4％和0,有两个以上高效基因型的患者的敏感性明显高于有1个或0个高效基因型的患者,其差异有统计学意义（x2=25．79,P〈0．01）。结论对XRCC1、XPD和GSTP1基因的单核苷酸多态性进行联合检测,可能预测患者对铂类药物的敏感性。     

GSTM1, GSTT1, and GSTP1 polymorphisms, breast cancer risk factors and mammographic density in women submitted to breast cancer screening

Genetic polymorphisms in genes related to the metabolism of xenobiotics, such as genes of the glutathione S-transferases (GSTM1, GSTT1, and GSTP1) superfamily have been associated with an increased risk for breast cancer (BC). Considering the high incidence of BC in the city of Porto Alegre in southern Brazil, the purpose of this study was to characterize genotypic and allelic frequencies of polymorphisms in GSTM1, GSTT1, and GSTP1, and correlate these molecular findings with established risk factors for breast cancer including mammographic density, in a sample of 750 asymptomatic women undergoing mammographic screening. Molecular tests were performed using the multiplex polymerase chain reaction (PCR) for GSTM1 and GSTT1, and quantitative PCR for GSTP1 polymorphisms. Overall, the frequencies of GSTM1 and GSTT1 null genotypes were 45% and 21%, respectively. For GSTP1 polymorphism, genotypic frequencies were 44% for the Ile/Ile genotype, 44% for the Ile/Val genotype, and 12% for Val/Val genotype, with an allelic frequency of 66% for the wild type allele in this population, similar to results of previous international publications. There was a statistically significant association between the combined GSTM1 and GSTT1 null genotypes (M-/T-) and mammographic density in post menopausal women (p = 0.031). When the GSTT1 null (T-) genotype was analyzed isolated, the association with mammographic density in post menopausal women and in the overall sample was also statistically significant (p = 0.023 and p = 0.027, respectively). These findings suggest an association of GSTM1 and GSTT1 null genotypes with mammographic density.     

CYP1A1基因多态性和GSTM1缺失与肺癌易感性的关系

[目的]探讨CYPlAl基因异亮氨酸(Ile)-缬氨酸(Val)位点多态性和GSTMl缺失与肺癌易感性的关系。[方法]以病例-对照方法,采用PCR技术检测82例原发性肺癌患者和91例对照者的CYPlAl基因Ile-Val位点多态性与GSTMl基因的缺失。[结果]Ile-Val3种多态基因型在肺癌组和对照组分布差异有显著性(P<0.05),Ile／Val、Val／Val基因型在肺癌组的分布频率明显高于对照组;logistic回归分析结果显示Ile／Val、Val／Val基因型患肺癌的危险性分别是Ile／Ile基因型的1.969(95％CI:1.012-3.828)倍和3.150倍(95％CI:1.278-7.761);GSTMl基因缺失在两组的分布频率差异有显著性(P<0.05,OR=2.157)。进一步联合CYPlAl多态性分析显示GSTMl缺失的个体同时携带Ile／Val或Val／Val基因型患肺癌的危险性较单独具有一种危险因子患肺癌的危险性显著增加(OR=5.538)。[结论]CYPlAl第7外显子的Ile／Val、Val／Val基因型和GSTMl缺失与肺癌的易感性有关,可望作为肺癌易感人群筛选的重要指标。