CYP1B1基因多态性与异常体液型乳腺癌易感性

目的 探讨细胞色素氧化酶p450(cytochrome,CYP)1B1基因外显子3密码子432亮氨酸(Leu)-缬氨酸(Val)位点多态性与乳腺癌(BC)及其异常体液型乳腺癌(BCAH)的相关性.方法 按维吾尔医学将乳腺癌病例组分为4种体液型,应用聚合酶链反应-限制性片断长度多态性(PCR-RFLP)技术检测84例BC患者和131例对照组的CYP1B1基因Leu432Val位点多态性的分布频率.结果 CYP1 B1各基因型及等位基因分布频率在BC、BCAH与对照组之间差异均无统计学意义(P＞0.05);在BC病例组中Leu/Val和Val/Val合并后其发生BC的风险是野生型Leu/Leu个体的2.137倍(95%CI=0.969 ～4.717,P=0.056),在BCABH病例组中其发生BC的风险是野生型Leu/Leu个体的3.636倍(95% CI =0.996～13.157,P=0.062).结论 CYP1B1突变基因型(Leu/Val+ Val/Val)可能与新疆汉族人群BC和BCABH易感性有关.     

CYP1A1和CYP1B1基因多态性与RPL易感性

目的 探讨CYP1A1、CYP1B1基因多态性与复发性流产(RPL)遗传易感性关系,为预防和治疗该病提供新靶点.方法 本研究采用等位基因特异性PCR (As-PCR)和聚合酶链反应-限制性片断长度多态性(PCRRFLP)方法,针对CYP1A1基因MspI酶切位点和CYP1B1 L432V多态位点,检测81例患有原因不明RPL病例组和98名有生育史健康女性对照组之间差异.结果 RPL组和对照组CYP1A1 MspI位点3种基因型m1/m1、m1/m2、m2/m2分布频率差异无统计学意义(x2=0.335,P＞0.05);CYP1B1 L432V多态位点3种基因型C/C、C/G、G/G在病例组和对照组分布差异有统计学意义(x2=7.467,P＜0.05);2组间C、G等位基因分布差异有统计学意义(x2=9.129,P=0.003);G/G、C/G基因型与C/C基因型比较,RPL危险度分别提高2.620、1.954倍;等位基因G使RPL危险性增加2.038倍.结论 CYP1B1 L432V突变基因型增加RPL发病风险,尚不能认为CYP1A1基因MspI位点多态性与RPL易感性有关.     

人工修饰双等位基因特异性引物扩增法检测CYP1B1多态性与肺癌易感性的关系

[目的 ]应用一种新的快速检测单核苷酸多态性 (SNP)方法———人工修饰双等位基因特异性引物扩增 (di ASA AMP)法研究CYP1B1基因Leu43 2Val位点多态性与江苏汉族人群肺癌易感性的关系。 [方法 ]采用配对病例 对照研究 ,收集江苏汉族人群原发性肺癌患者 2 2 7例为病例组 ,同时按 1∶1配对选择非肿瘤、非呼吸道疾病患者 2 2 7例为对照组。应用diASA AMP方法检测了病例组与对照组CYP1B1基因Leu43 2Val位点多态性 ,分析Leu43 2Val位点突变与肺癌易感性之间的关系。并应用测序法验证diASA AMP法的特异性。 [结果 ]CYP1B1基因Leu43 2Val位点突变C和G的基因频率在对照组和病例组的分布差异无显著性 ( χ2 =0 .2 0 1,P >0 .0 5 ) ,单纯CYP1B1基因Leu43 2Val位点突变与肺癌危险性也不存在明显的相关关系 (OR =1.0 85 ,95 %CI =0 .73 0～ 1.615 ) ,但该位点突变与吸烟可能有一定协同作用 ,携带G等位基因的基因型可增加吸烟者患肺癌的危险性 (OR =2 .0 5 7,95 %CI =1.162～ 3 .64 2 )。对照组的CYP1B1C和G等位基因频率与现有的中国汉族人群资料结果相近 ,测序结果与diASA AMP结果相符。 [结论 ]CYP1B1Leu43 2Val多态性可能是江苏汉族人群吸烟者肺癌发生的易感因素。diASA AMP法可用于单核苷酸多态性的快速测定     

广西部分壮族妇女CYP1B1基因Ala119Ser多态性与乳腺癌易感性研究

目的探讨CYP1B1基因Ala119Ser与乳腺癌易感性的关联性。方法采用聚合酶链反应-限制性片断长度多态性(PCR-RFLP)技术对88例广西壮族女性乳腺癌患者和106例健康对照者进行CYP1B1 Ala119Ser基因分型,并分析其与乳腺癌患病的关系。结果病例组CYP1B1 Ala119Ser T等位基因分布频率(30.7%)明显高于对照组(19.3%),差异有统计学意义(P<0.05)。病例组3种基因型(GG、GT、TT)分布频率与对照组相比,差异有统计学意义(P<0.05);病例组CYP1B1 Ala119Ser突变型纯合子(TT)的分布频率为10.2%,明显高于对照组(2.8%);与野生型纯合子(GG)相比,病例组TT基因型能增加乳腺癌患病风险(OR=4.74,95%CI为1.22~18.51)。结论 CYP1B1 Ala119Ser突变可能增加广西壮族妇女乳腺癌易感性。     

CYP19和CYP1B1基因多态性与妊娠期肝内胆汁淤积症易感性的研究

目的:探讨P450酶系的CYP19和CYP1B1基因多态性与妊娠期肝内胆汁淤积症(ICP)发病的关系。方法:应用聚合酶链反应-限制性片段多态性技术(PCR-RFLP)和等位基因特异性PCR技术(AS-PCR)对100例ICP患者和100例正常对照孕妇CYP19基因第3外显子Rsal酶切多态和CYP1B1基因外显子3密码子432(C-G)多态性进行分析。结果:①对照组CYP19的基因型AA、AG、GG频率分别为30.0%、50.0%、20.0%,ICP组分别为38.0%、45.0%、17.0%,两组比较差异无统计学意义(P>0.05);对照组等位基因A、G频率分别为55.0%、45.0%,ICP组分别为60.5%、39.5%,两组比较差异也无统计学意义(P>0.05)。②对照组CYP1B1的基因型CC、CG频率分别为80.0%、20.0%,ICP组分别为70.0%、30.0%,两组均无突变纯合子(GG),两组比较差异无统计学意义(P>0.05);对照组等位基因C、G频率分别为90%、10%,ICP组分别为85%、15%,两组比较差异也无统计学意义(P>0.0S)。结论:CYP19外显子3基因多态性和CYP1B1外显子3密码子432基因多态性与ICP发病无关。     

CYP 1B1基因A119S多态性与妊娠期肝内胆汁淤积症风险关系的研究

目的:探讨CYP1B1基因A119S多态性与妊娠期肝内胆汁淤积症(ICP)发生危险性的关系。方法:用等位基因特异性PCR(AS-PCR)法,对73例妊娠期肝内胆汁淤积症患者和90例正常女性的CYP1B1 A119S多态位点进行检测分析,确定出多态性的3种基因型,即野生型G/G、杂合型G/T、突变型T/T。结果:CYP1B1基因A119S多态性G/G、G/T、T/T 3种基因型分布频率,ICP组分别为3.8%、39.7%和16.5%,对照组分别为64.4%、26.7%和8.9%;ICP组G、T等位基因频率为63.7%,36.3%,对照组为77.8%,22.2%。CYP1B1 A119S多态性基因型及等位基因型在两组间分布频率的差别有统计学意义(P<0.05)。基因型T/T与G/G比较、G/T与G/G比较,OR值分别为2.719(1.007～7.341)倍和2.190(1.096～4.375)倍;等位基因T使ICP危险性增加了1.995(1.226～3.246)倍。结论:CYP1B1 A119S多态位点3种基因型的分布与ICP发病风险有一定关联,突变基因型增加了ICP的发病风险。     

广西壮族人群肝癌家族聚集与细胞色素P450 2E1基因多态性等因素关系的研究

目的 探讨广西壮族人群肝癌高发家族聚集与细胞色素P450 2E1(CYP2E1)基因多态性等因素的关系.方法 在广西某肝癌高发现场壮族人群中,对10个肝癌高发家族成员(共91名)和10个无癌对照家族成员(共102名).采集外周血标本,以多聚酶链反应-限制性片段长度多态性技术(PCR-RFLP).分析所有研究对象CYP2EI基因Rsa I位点基闪型及等位基因的分布频率;并用ELISA法检测HBsAg.肝癌相关因素的暴露情况则应用统一问卷进行调查.结果 肝癌高发家族成员CYP2EI基因Rsa I位点c1/c1、c1/c2基因型频率分别为63.7%和36.3%;在对照家族成员中,相应的频率分别为48.0%和52.O%(OR=1.901,95%CI:1.067～3.387);两组成员Rsa I位点基因型分布的差异有统计学意义(X2=4.797,P=0.029).非条件logistic回归分析结果显示,当地肝癌家族聚集的主要危险因素,按其危险度由高至低排列依次为:以玉米为主食、HBsAg携带、CYP2E1 c1/c1型.结论 在广西壮族人群中,肝癌的家族聚集与家族成员的CYP2E1基因Rsa I多态性的分布,有肯定的统计学关系;CYP2E1基因Rsa I多态性的分布不是引起肝癌家族聚集的惟一因素,也不是首要因素,与其他一些因素的综合作用更为重要.     

过氧化物酶体增殖受体γ辅激活因子-1多态性与2型糖尿病相关性研究

[目的]探讨廷边地区朝鲜族、汉族人群中过氧化物酶体增殖受体γ辅激活园子-1(PGC-1)多态性与2型糖尿病的相关性.[方法]采用聚合酶链反应一单链构泉多态性(PCR-SSCP),对104例正常人群和113例2型糖尿病患者的PGC-1基因Thr394Thr、Leu410Iso和Leu438Ser多态性基因型进行对照分析.[结果]朝鲜族和汉族正常人群pGC-1基因Thr394多态性的A等位基因频率分别为23.3%和20.7%,两民族间无统计学差异;糖耐量正常组的PGC-1基因Thr394Thr多态性的A等位基因频率为22.1%,2型耱尿病组的A等位基因频率为22.1%,两组间无差异;未检测出Leu410Iso和Leu438Ser多态性.[结论]PGC-1基因Thr39Thr多态性在延边朝鲜族和汉族人群之间无差异;PGC-1基因Thr394Thr与2型糖屎病无相关性.     

强直性脊柱炎易感性与IL-1F10基因多态性关系

目的探讨强直性脊柱炎易感性与白细胞介素-1F10(IL-1F10)基因中rs6743376和rs6761276位点基因多态性的关系。方法收集2007-2008年安徽医科大学附属第一医院门诊确诊的强直性脊柱炎患者161例和同期正常健康献血人群对照178人,采用基于高温连接酶的连接酶检测反应(LDR)方法检测其IL-1F10 rs6743376和rs6761276位点的单核苷酸多态性,分析比较其等位基因频率及基因型频率在2组中的分布。结果病例组和对照组的rs6743376位点A等位基因频率分别为74.2%,71.6%;C等位基因频率分别为25.8%,28.4%;2组的rs6761276位点C等位基因频率分别为21.1%,18.0%;T等位基因频率分别为78.9%,82.0%;2个位点等位基因在2组人群中的分布差异均无统计学意义(均P0.05);基因型频率在2组间的分布差异也无统计学意义。结论安徽籍汉族人群强直性脊柱炎易感性与IL-1F10基因rs6743376和rs6761276位点单核苷酸多态性无关。     

广西人群TGF-β1基因rs1800469C/T遗传多态性的研究

目的研究转化生长因子β1(TGF-β1)基因rs1800469C/T位点多态性各等位基因及基因型在广西人群中的分布频率,比较其在不同种族间的分布差异。方法采用聚合酶链反应-限制性片段长度多态性技术和DNA测序法检测210例广西人群TGF-β1基因rs1800469C/T位点多态性,并结合文献进行不同种族间的比较分析。结果广西人群中,TGF-β1基因rs1800469C/T位点表现出CC、CT、TT三种基因型,频率分别为24.3%、49.5%、和26.2%,C、T等位基因型频率分别为49.0%和51.0%。其基因型及等位基因频率在男女间比较,差异无统计学意义(P>0.05)。进一步将其分型数据与人类基因组计划公布的4个人群和参考文献中部分种族人群比较发现,广西人群中,TGF-β1基因rs1800469C/T位点基因型及等位基因频率与英国人、土耳其人、欧洲人(Hap Map-CEU)和非洲人(Hap Map-YRI)比较,差异均有统计学意义(P<0.05),而与日本人(Hap Map-JPT)、北京汉族人(Hap Map-HCB)、福州人和重庆汉族人比较,差异均无统计学意义(P>0.05)。结论在广西人群中存在TGF-β1基因rs1800469C/T位点多态性,其基因多态性的分布频率差异无统计学意义,但与其他种族人群比较存在显著差异。这种差异可能是导致一些疾病在不同种族人群间临床表现及发病率存在较大差异的因素之一。     

Meta- and pooled analyses of the cytochrome P-450 1B1 Val432Leu polymorphism and breast cancer: a HuGE-GSEC review

The association between the cytochrome P-450 1B1 (CYP1B1) Val432Leu polymorphism and breast cancer was assessed through a meta-analysis of all published case-control studies and a pooled analysis of both published and unpublished case-control studies from the Genetic Susceptibility to Environmental Carcinogens (GSEC) database ( www.upci.upmc.edu/research/ccps/ccontrol/g_intro.html ). GSEC is a collaborative project that gathers information on studies of metabolic gene polymorphisms and cancer. Thirteen articles were included in the meta-analysis (14,331 subjects; 7,514 cases, 6,817 controls); nine data sets were included in the pooled analysis (6,842 subjects; 3,391 cases, 3,451 controls). A summary meta- or pooled estimate of the association between the CYP1B1 Val432Leu polymorphism and breast cancer could not be calculated because of statistically significant heterogeneity in the point estimates among studies. No association between the CYP1B1 Val432Leu polymorphism and breast cancer was observed in Asians (for Val/Val and Val/Leu combined, odds ratio (OR) = 1.0, 95% confidence interval (CI): 0.8, 1.2). An inverse association was observed in populations of mixed/African origin (OR = 0.8, 95% CI: 0.7, 0.9). The pooled analysis suggested a possible association in Caucasians (for Val/Val and Val/Leu combined, OR = 1.5, 95% CI: 1.1, 2.1), with effect modification across age categories. The observed effect of age on the association in Caucasians indicates that further studies are needed on the role of CYP1B1 Val432Leu in estrogen metabolism according to age, ethnicity, and menopausal status.     

CYP1A1基因多态性与焦炉工尿中1-羟基芘水平的关系

目的 研究CYPIAl多态性与焦炉工尿中1-羟基芘水平的关系.方法 按照苯并[a]芘(B[a]P)接触水平将223名焦炉工分为炉顶组(76名)、炉侧组(82名)和炉底组(65名),以119名无职业性接触多环芳烃的工人为对照组,采用聚合酶链反应-限制性片段长度多态性分析(PCR-RFLP)CYPIAl基因Mspl位点多态性、等位基凶特异性扩增方法 检测CYPlAl基因1462V位点的多态性.结果 炉顶组、炉侧组和炉底组焦炉工尿中1-羟基芘水平分别为(3.77+0.64)、(3.57+0.49)、(3.26+0.80)μmol/mol Cr,明显高于对照组,差异有统计学意义(PO.05).炉侧组和炉顶组CYPIAl 1462V位点的各基因型尿中1-羟基芘水平均为Ⅱe/Ⅱe<Ⅱe/Val相似文献   

Detection of CYP1A1 gene polymorphism using designed RFLP and distributions of CYP1A1 genotypes in Japanese

Isoleucine (Ile)-valine (Val) polymorphism, which is caused by a point mutation from A to G in exon 7, is reported to be associated with an elevated risk of lung cancer among Japanese. Because CYP1A1 catalyzes bioactivation of environmental procarcinogens, such as benzo[a]pyrene, it is very important to study the clinical meaning of Ile-Val polymorphism using an epidemiological study. In an epidemiological study, easy, economical, rapid and reliable identification of the CYP1A1 genotype is necessary. The present study shows that the new method, designed restriction fragment length polymorphism (designed RFLP), can detect Ile-Val polymorphism of CYP1A1 The Ile-Val polymorphism detected using this new method was consistent with that found by the allele-specific PCR amplifications (ASA) method in six cases tested. This new method detected Ile-Va1 polymorphism of CYP1A1 using 240 healthy Japanese who lived in the northern Kyusyu region. The frequency of the genotypes was as follows: Ile/Ile, 159 (66.2%); Ile/Val, 65 (27.1%); Val/Val, 16 (6.7%). The frequency of the Ile gene was 0.798 and that of the Val gene, 0.202. There was no difference in Ile-Val polymorphism based on sex or age. Racial differences influenced the distribution of this polymorphism, but Japanese regional differences did not. Since this new method, designed RFLP, is rapid, reliable and suitable for large-scale screening of polymorphisms, it may be used routinely to detect Ile-Val polymorphism of CYP1A1 Furthermore, it will help to evaluate the relationship between CYP1A1 polymorphism and individual sensitivity to xenobiotics that may affect the incidence of lung cancer.     

CD40L基因rs3092921G/A和rs3092933G/A位点多态性在广西壮族和汉族人群中的分布

摘要:目的　研究CD40L基因单核苷酸多态性（rs3092921G/A和rs3092933G/A）在广西汉族和壮族人群中的分布,同时对比不同种族间CD40L基因型及等位基因频率分布的差别。方法　采用聚合酶链反应 -限制性片段长度多态性的方法,检测 201名广西汉族人和 200 名广西壮族人 CD40L基因多态性,比较两组人群两个位点的基因型和等位基因的分布频率,并与人类基因组计划（HapMap）公布的欧洲人、非洲人、日本人和中国北京人的单核苷酸多态性分型数据比较,剖析这 6个人群的基因型及等位基因的分布频率。结果　在广西汉族、壮族人群中,CD40L基因 rs3092921G/A和rs3092933G/A两位点 GG、GA 及 AA基因型频率均分别为93.0%、4.0%、3.0%和87.0%、7.0%、6.0%;G和A等位基因频率均分别为 95.0%、5.0% 和 90.5%、9.5%。两位点基因型频率在两个人群中的分布差异无统计学意义（χ2均为4.10;P均＞0.05）,两位点等位基因频率的分布差异有统计学意义（χ2均为6.12;P均＜0.05）。与人类基因组计划（HapMap）公布的欧洲人、非洲人、日本人和中国北京人的单核苷酸多态性分型数据进行比较,CD40L 基因rs3092921G/A和rs3092933G/A两个位点基因型和等位基因频率在广西汉族人、北京人与日本人和非洲人群的差异具有统计学意义（χ2分别为6.68、10.14、304.70和6.68、10.14、13.44;P均＜0.05）。结论　在广西地区壮族和汉族人群中存在着CD40L基因多态性。广西汉族人群CD40L基因多态性的分布频率与其他种族人群比较存在显著的差异,这种差异也许是与CD40L相关的疾病在不同种族人群间的发病率不同的原因之一,对于群体遗传学及人类学的研究可能起非常重要的作用。     

Adipose tissue PCB levels and CYP1B1 and COMT genotypes in relation to breast cancer risk in postmenopausal Danish women

Exposure to PCBs may be an etiologic factor for breast cancer. The cytochrome P450 1B1 (CYP1B1) and catechol-O-methyltransferase (COMT) enzymes are involved in estrogen metabolism and PCB metabolism, both of which may relate to breast cancer susceptibility. Polymorphisms in genes regulating these enzymes control efficiency. Our objective was to assess whether CYP1B1 and COMT gene polymorphisms modulate the effect of PCBs in breast cancer risk, among postmenopausal Danish women. Neither CYP1B1 Leu432Val polymorphisms nor adipose tissue PCBs were independently associated with breast cancer risk. When assessing the independent effect of the COMT Val158Met polymorphism, we observed reduced risk for breast cancer amongst hormone replacement therapy using women who were homozygous carriers of the variant allele compared with those carrying the wild-type variant (RR?=?0.41; 95% CI: 0.29–0.89). We found no statistically significant interactions between any of the PCB groups and CYP1B1 or COMT polymorphisms on the risk of breast cancer.     

CYP4502E1基因多态型对青海藏族男性饮酒行为的影响

目的分析细胞色素P450 2E1(CYP450 2E1)不同基因型及等位基因频率,探讨其与藏族男性饮酒行为之间的关系。方法采用自评式问卷,对325名藏族男性进行调查分析,其中饮酒者193人,不饮酒者132人,另选取266名汉族男性作为对照,采用聚合酶链式反应-限制性内切酶片段长度多态性(PCR-RFLP)对基因的多态型进行分析,探讨其与饮酒行为之间的相关性。结果不同职业﹑文化程度﹑经济收入﹑婚姻情况﹑吸烟情况人群组中的饮酒率差异具有显著性(P<0.05)。藏汉族男性基因型及等位基因频率分布差异无显著性(P>0.05)。藏族男性饮酒组和不饮酒组比较,CYP450 2E1三种基因型c1/c1、c1/c2和c2/c2的分布差异具有显著性(χ2=10.101,P<0.05),c1/c2基因型频率在饮酒组比在不饮酒组中的高;c1和c2两个等位基因分布差异也具有显著性(χ2=9.223,P<0.05),c2等位基因频率在饮酒组也比在不饮酒组中的高,与安全饮酒相比,危险饮酒组中c2等位基因频率更高。c2等位基因与是否饮酒以及饮酒量的关联程度分别为0.17和0.20。多因素分析显示:影响饮酒行为的因素依次为CYP450 2E1基因、吸烟和经济收入。结论CYP450 2E1基因是影响藏族男性饮酒行为的主要因素。     

Analysis of PRNP Gene Codon 129 Polymorphism in the Greek Population

Creutzfeldt–Jakob disease (CJD) is a fatal transmissible neurodegenerative prion disease with a rapid progression comprising familial, sporadic, iatrogenic and variant forms. A polymorphism at codon 129 of PRNP gene has been implicated in the development of variant CJD. We examined Met/Val allele frequencies and the genotype distribution, with respect to the polymorphic codon 129 of PRNP gene in 348 healthy individuals from the region of Athens, Greece. The following genotype frequencies were observed in the Greek population: Met/Met 50%, Met/Val 39% and Val/Val 11%. The presence of the Methionine allele frequencies in various European populations, according to the published data, increases gradually from northwestern to southeastern countries, implying the presence of a cline. The distribution of genotypes of Met homozygotes displays random declination across the 10 compared populations. The observed higher frequency of Met homozygotes at codon 129 does not necessarily suggest that these populations are at increased risk of developing CJD.     

吉林市汉族妇女GSTM1基因和CYP1A1基因Exon7位点多态性与 子宫内膜异位症易感性的研究

目的:探讨在吉林地区汉族妇女中细胞色素P450(CYP1A1)基因Exon7位点多态性即Ile-Val位点的多态性及GSTM1基因多态性和子宫内膜异位症易感性的相关关系。方法:以病例对照的研究方法,采用PCR技术检测216例子宫内膜异位症和216例对照人群的CYP1A1基因Ile-Val位点及GSTM1基因多态性的表达。结果:吉林地区汉族人群中GSTM1空白基因型分布频率0.463,内异症人群中空白基因型分布频率0.667,两组差异有统计学意义(P<0.05),空白基因型患内异症的危险是功能基因型的1.896倍;Ile-Val三种多态基因型在内异症组和对照组分布差异有统计学意义(P<0.05),Ile/Val、Val/Val基因型患内异症的危险分别是Ile/Ile基因型的1.901倍和3.056倍;CYP1A1 Ile/Val联合GSTM1空白基因型个体的OR值为3.409(95%C I 1.897~6.125,P<0.01),而CYP1A1Val/Val联合GSTM1空白基因型个体的OR值增高至7.143(95%C I 2.584~19.742,P<0.01)。结论:CYP1A1 Exon7的Ile/Val、Val/Val基因型及GSTM1空白基因型与内异症的易感性有关,二者联合效应具有协同作用,可望作为内异症易感人群筛选的重要指标。