蒙族和汉族人群 CYP1A1基因MspⅠ位点的多态性

目的研究内蒙古地区蒙族和汉族人群CYP1A1基因Msp Ⅰ位点的多态性。方法应用聚合酶链反应．限制性片段长度多态技术对无血缘关系的80名蒙族和120名汉族个体的基因型进行分析。结果内蒙古地区蒙族和汉族人群CYP1A1基因wt／wt、wt／vt和vt/vt 3种基因型的频率分布分别是：蒙族35．0％、48．7％、16．3％和汉族33．3％、52．5％、14．2％。两者之间经X^2检验差异无统计学意义（P〉0．05）。结论内蒙古地区蒙族和汉族人群CYP1A1 基因Msp Ⅰ的基因型频率分布无明显差异。     

胆固醇7α-羟化酶基因-204A/C多态性与内源性高甘油三酯血症关联的研究

目的探讨成都地区内源性高甘油三酯血症（hypertriglyceridemia，HTG）患者胆固醇7α-羟化酶（cholesterol 7α-hydroxylase，CYP7A1）基因一204A／C多态性与血脂及载脂蛋白的关系。方法应用聚合酶链反应-限制性片段长度多态性技术检测212名正常对照者和132例内源性HTG患者CYP7A1-204A／C基因多态性。酶法测定血清甘油三酯（triglyceride，TG）、总胆固醇（total cholesterol，TC）及高密度脂蛋白胆固醇（high density lipoprotein cholesterol，HDL-C），用本校载脂蛋白研究室研制的RID试剂盒测定血清apoAI、A1I、B100、CH、C111及E。结果CYP7A1—204A／C多态位点等位基因A、C频率在HTG组和正常对照组分别为0．602、0．398和0．601、0．399。等位基因频率和基因型频率分布均符合Hardv—Weinberg平衡定律。CYP7A1—204A／C多态性基因型频率，等位基因A、c频率在HTG组和正常对照组间比较差异无统计学意义（P〉0．05）。HTG组CC、AC基因型患者血清TG和apoCⅢ水平较从基因型患者显著增高（P〈0．05）。血清HDL-C水平在正常对照组中CC、AC基因型者较AA基因型者显著降低（P〈0．05），正常对照组中男性CC、AC基因型者血清TG水平较从基因型者显著增高（P〈0．05）。结论CYP7A1基因-204A／C多态性与HTG无关联，但HTG患者CYP7A1基因-204A／C多态性与血清TG和apoCⅢ水平密切相关。CYP7A1基因-204A／C多态性在正常对照组中与血清HDL-C水平密切相关，在正常男性人群中与血清TG水平增高密切相关。     

CYP1A1基因多态性与急性淋巴细胞白血病的关系

目的　探讨CYP1A1基因多态性与急性淋巴细胞白血病 (ALL)遗传易感性的关系。方法　应用PCR -RFLP、ASA技术 ,分析 78例ALL患者和 112例健康人CYP1A1基因多态性 ,比较ALL患者与对照组间频率差异。结果　ALL组CYP1A1MspI基因多态位点 ,各等位基因和基因型频率与对照组比较有显著性差异 (P <0 .0 5 ) ,其中等位基因m2使患ALL的危险度提高了 1.5 4倍 ,m1m2、m2m2基因型使患ALL的危险度分别提高了 2 .2 7倍和 2 .77倍 ;ALL组CYP1A1Ile-Val各等位基因和基因型频率与对照组比较无显著性差异 (P >0 .0 5 )。结论　CYP1A1MspI基因多态可能与ALL的发生有关。     

中山地区人群KCNQ1基因多态性与妊娠期糖尿病相关性研究

目的探讨电压门控性钾通道Q亚家族成员1（KCNQl）基因rs2237892（C／T）,m2237895（A／C）,rs2237896（AVG）位点单核苷酸多态性与中山地区人群妊娠期糖尿病（GDM）的关系。方法本研究共采用2011年-2013年中山市南朗医院和中山市博爱医院共285例孕妇,其中GDM组185例,血糖正常100例设为对照组。采用聚合酶链反应-限制性片段长度多态性（PCR—RFLP）检测KCNQl基因多态性,评估其与GDM的相关性。GDM组和对照组基因型分布运用logistic回归模型分析。GDM组相关表型运用多重回归模型分析。结果（1）SNPrs2237896的三种基因型（AA、AG、GG）在GDM组和对照组分布频率分别是4．8％,42．2％,53．0％和3．0％,28．0％,69．0％,两组的基因型分布频率差异显著（P=0．032,P〈0．05）。Rs2237896等位基因A、G的分布频率（26％。74％）高于对照组（17％,83％）,差异具有显著性（P=0．015）。（2）SNPm223782中,其三种基因型（CC、CT、1Tr）在GDM组和对照组分布频率分别是24．8％,68．1％,8．1％和38％,49％,13％,其基因型分布频率两组具有显著差异（P=0．007,P〈0．05）,但是Rs2237892等位基因C、T的分布频率并不具有差异（P=0．279,P〉0．05）。结论KCNQ1基因SNPrs2237896多态性可能与中国中山市人群中GDM发病具有一定相关性。     

广西壮族与汉族人群的转化生长因子-β1基因多态性

目的：研究转化生长因子-β1（TGF-β1）基因-509C／T位点多态性在广西壮族与汉族人群中的分布。方法：应用聚合酶链反应-限制性片段长度多态性技术（PCR-RFLP）检测180名壮族人和170名汉族人的TGF-β1基因-509C／T位点多态性,比较两组人群TGF-β1基因型和等位基因的分布频率。结果：在壮族人中CC基因型占41．1％、CT基因型占46．1％、TT基因型占12．8％;在汉族人中CC基因型占28．9％、CT基因型占52．9％、TT基因型占18．2％。两组人群TGF-β1基因型的分布频率差异有显著性。结论：壮族与汉族人群TGF-β1基因多态性分布频率差异有显著性。     

CYP19A1基因 R264C在中国上海BRCA1/2基因突变阴性的遗传倾向乳腺癌中的作用

目的研究CYP19A1基因R264C的（C→T）单核苷酸多态性基因型在上海地区BRCA1／BR-CA2基因突变阴性的遗传倾向乳腺癌人群中的分布及其与乳腺癌发病风险的相关性。方法对114例无BRCA1／2突变的家族性／早发性乳腺癌患者和121名正常对照者进行CYP19A1基因第7外显子的聚合酶链反应扩增，随后进行DNA直接测序鉴定其R264C的单核苷酸多态性基因型，比较基因型分布和发病风险的关系；危险度比值比（odd ratio，OR）及95％可信区间（confidence interval，CI）应用非条件Logistie回归分析计算。结果CYP19A1基因R264C多态的CC、CT、TT基因型在病例组中的分布频率分别为84（77．8％），22（20．4％），2（1、8％）；在对照组的分布频率分别为87（77．7％），24（21、4％），1（0．9％）；在研究的总人群中，CT基因型的频率为20．9％（46／220），TT基因型的频率为1．4％（3／220）。以CC基因型为参照，CT或TT基因型没有显著性地提高乳腺癌的发病危险，其中携带CT基因型风险为（OR=1．16，95％CI：0．53。2．55），携带TT基因型风险为（OR=1．44，95％CI：0．12-17．15）；经过月经状态和身体质量指数分层，也未能发现其与乳腺癌发病的相关性。结论CYP19A1基因R264C的单核苷酸多态性在中国汉族人群中的分布有别于其他种族，有其自身的分布特点；R264C可能与上海地区中国汉族人群乳腺癌发生的遗传易感性无关，尚不足作为低外显率的乳腺癌易感基因位点，不建议作为未来临床基因筛查的候选指标。     

中国北方汉族人细胞色素P4501 A1基因MspⅠ多态性的研究

目的　探讨中国北方汉族人细胞色素P(cytochromeP ,CYP) 4 5 0 1A1基因MspⅠ多态性。方法　用聚合酶链反应 限制性片段长度多态性 (PCR RFLP)技术 ,分析了 172名北方汉族正常健康成人CYP1A1基因 3′端限制性内切酶MspⅠ位点的3种基因型 (A、B、C)的分布频率。结果　MspⅠ等位基因m1、m2分别占 6 0 8%、39 2 %。MspⅠ基因型A占 34 9% ,基因型B占 5 1 7% ,基因型C占 13 4 %。结论　本研究结果提示中国北方汉族人解毒酶CYP1A1基因存在MspⅠ多态性。     

江苏汉族人群XRCC1基因的遗传多态性研究

目的探讨江苏省汉族正常人群中X线修复交叉互补基因1（XRCC1）常见的两个单核苷酸多态（SNPs）C26304T和G27466A的遗传分布特点。方法采用聚合酶链反应（PCR）及限制性片段长度多态（RFLP）方法分析江苏省扬中地区511名健康汉族人的XRCC1基因C26304T和G27466A的基因多态性。结果511名江苏汉族人的XRCC1 C26304T基因型CC、CT、TT的频率分别为45．8％、42．7％和11．5％,等位基因C、T的频率分别为67．1％和32．9％。G27466A基因型GG、GA、AA的频率分别为68．9％、29．0％和2．1％,等位基因G、A的频率分别为83．4％和16．6％。江苏人群的C26304T基因型频率和等位基因频率分布与浙江、台湾人群均无明显差异（P〉0．05）,但与意大利人、美国白人、美国黑人的差异具有显著性（P〈0．05）。江苏人群的G27466A基因型频率和等位基因频率分布与浙江人、台湾人、意大利人、美国白人、美国黑人的差异均具有显著性（P〈0．05）。结论本研究揭示了江苏汉族人群XRCC1基因C26304T和G27466A的等位基因频率和基因型频率分布特点;证实了C26304T和G27466A位点的等位基因和基因型频率存在种族、地区差异。     

反复呼吸道感染患儿红细胞CR1数量基因多态性及其红细胞免疫功能

目的 通过研究红细胞补体受体1（CR1）数量基因多态性与红细胞免疫功能的相关性，探讨反复呼吸道感染（RRTI）患儿的遗传易感因素。方法 采用红细胞C3b受体花环率和红细胞免疫复合物花环率，并利用限制性内切酶Hind Ⅲ，聚合酶链反应（PCR）测定38例RRTI患儿（病例组）和56例正常儿童（对照组）的红细胞CR1活性与CR1数量基因多态性，并进行比较。结果 病例组中红细胞C3b受体花环率明显低于正常对照组，差异有显著性（P〈0．01），而红细胞免疫复合物花环率略低于正常对照组，差异无显著性（P〉0．05），且CR1基因HH、HL和LL基因型分布频率分别为34．2％、55．3％和10．5％，而对照组中H14、HL和LL基因型分布频率分别为75％、21．4％和3．6％。两组CR1基因型的分布频率差异有显著性（P〈0．01）。病例组中肌和LL基因型占优势（OR：5．77）。两组CR1基因等位基因的分布频率差异也有显著性（P〈0．01），病例组中L等位基因分布频率高于对照组。结论 反复呼吸道感染患儿CR1数量基因多态性与红细胞免疫功能有相关性，提示CR1基因Hind Ⅲ酶切位点多态性可能在决定个体反复呼吸道感染遗传易感性方面有重要作用。     

多巴胺D2受体基因启动子多态性与帕金森病的关联研究

目的 探讨中国汉族人群多巴胺D2受体基因启动子多态性在帕金森病（Parkinson's disease,PD)遗传易感性中的作用。方法 采用病例－对照关联分析，聚合酶链反应－限制性片段长度多态性方法分析了123例PD患者（PD组）与124名健康成人（对照组）多巴胺D2受体基因启动子多态性。结果 PD组－141△C等位基因频率为8．5％，对照组为11．7％；两组差异无显著性（P＞0．05）；中国汉族人PD组组和对照组－141△C等位基因频率明显高于意大利南部人群，差异有显著性（P＜0．05）。结论中国汉族人群多巴胺D2受体基因启动子多态性与PD的遗传易感性无关，该多态性有明显的种族差异。     

广州地区汉族人群细胞色素P450 1A1和细胞色素P450 2E1基因多态性

目的 探讨广州地区汉族人群细胞色素Ｐ４５０ １Ａ１（ＣＹＰ１Ａ１）和细胞色素Ｐ４５０ ２Ｅ１（ＣＹＰ２Ｅ１）基因的多态性分布规律。方法 用ＰＣＲ－ＲＦＬＰ和等位基因特异性扩增技术,对１５０名广州地区汉族正常人的ＣＹＰ１Ａ１和ＣＹＰ２Ｅ１基因多态性进行了检测,并与其他人群进行了比较。结果 ＣＹＰ１Ａ１基因３’端非翻译区的Ｍｓｐ１多态位点ｍ１（ＭＳＰⅠ－）、ｍ２（ＭｓｐⅠ＋）等位基因频率分别为６２．３     

CYP1B1基因多态性与子宫内膜异位症易感性的相关研究

目的 研究CYP1B1基因第2外显子119(G-T)、第3外显子432(C-G)多态性与子宫内膜异位症(endometriosis,Ems)易感性的关系.方法 采用等位基因特异性聚合酶链反应对55例Ems患者和45例对照组进行CYP1B1基因第2外显子119(G-T)、第3外显子432(C-G)突变分析,探讨Ems的发生与CYP1B1基因多态性之间的相关性.结果 CYP1B1基因密码子119中等位基因G、T在Ems组和对照组分布的差异有统计学意义(P＜0.05),其中等位基因T使Ems发病风险提高2.061倍;CYP1B1基因密码子119G/T各基因型分布两组间差异有统计学意义(P＜0.05),纯合突变(T/T)基因型、杂合突变(G/T)基因型与野生型(G/G)基因型相比,患Ems的危险度分别为2.625倍和3.214倍.以CYP1B1联合野生型GG和CC个体的OR值为1相比,CYP1B基因密码子119杂合型突变(Ala/Ser)合并密码子432野生型个体的OR值为2.976,95%CI:1.129～7.848,P＜0.05.结论 CYP1B1基因第2外显子119(G-T)突变等位基因与Ems的发生有一定关系,突变基因型增加了Ems的发病风险;CYP1B1基因第2外显子杂合型突变(Ala/Ser)联合密码子432野生型能增加Ems的发病风险.     

Association of CYP1A1 gene polymorphism with recurrent pregnancy loss in the South Indian population

BACKGROUND: We investigated the relationship between idiopathic recurrent pregnancy loss (RPL) and genetic polymorphisms in phase I and phase II detoxification genes which include CYP1A1, CYP2D6, GSTM1, GSTP1 and GSTT1. METHOD: A case-control study comprised 160 females with RPL and 63 healthy controls with a successful reproductive history. RESULTS: The CYP1A1 variant allele was present at frequencies of 0.61 and 0.44 in cases and controls, respectively (odds ratio=1.93; P=0.023, 95% confidence interval 1.10-3.38). The CYP2D6 variant allele was present at a frequency of 0.17 in females with RPL, while in the control population the frequency was 0.16. The GSTM1 and GSTT1 null genotypes were present at frequencies of 0.39 and 0.26 in RPL cases, whereas in controls the frequencies were 0.37 and 0.17, respectively. The mutant GSTP1 frequencies in case and control women were 0.38 and 0.40, respectively. We report a significant association of the CYP1A1*2A allele with RPL which is confirmed by logistic regression analysis. No association was observed for the other polymorphisms or in their combinations studied. CONCLUSIONS: The present study suggests the occurrence of the CYP1A1*2A allele as a probable risk factor in idiopathic recurrent miscarriages.     

Ah receptor, CYP1A1, CYP1A2 and CYP1B1 gene polymorphisms are not involved in the risk of recurrent pregnancy loss

The etiology of recurrent pregnancy loss (RPL) remains unclear, but it may be related to a possible genetic predisposition together with involvement of environmental factors. We examined the relation between RPL and polymorphisms in four genes, human aryl hydrocarbon (Ah) receptor, cytochrome P450 (CYP) 1A1, CYP1A2 and CYP1B1, which are involved in the metabolism of a wide range of environmental toxins and carcinogens. All cases and controls were women resident in Sapporo, Japan and the surrounding area. The Ah receptor, CYP1A1, CYP1A2 and CYP1B1 genotypes were assessed in 113 Japanese women with recurrent pregnancy loss (RPL) and 203 ethnically matched women experiencing at least one live birth and no spontaneous abortion (control). No significant differences in Ah receptor, CYP1A1, CYP1A2 and CYP1B1 genotype frequencies were found between the women with RPL and the controls [Ah receptor: Arg/Arg (reference); Arg/Lys and Lys/Lys, odds ratio (OR)=0.67; 95% confidence interval (CI)=0.40-1.11, CYP1A1: m1m1 (reference); m1m2 and m2m2, OR = 0.86; 95% CI = 0.53-1.40, CYP1A2: C/C and C/A (reference); A/A, OR = 1.16; 95% CI = 0.71-1.88, CYP1B1: Leu/Leu (reference); Leu/Val and Val/Val, OR = 1.18; 95% CI = 0.68-2.02]. The present study suggests that the Ah receptor, CYP1A1, CYP1A2 and CYP1B1 gene polymorphisms are not major genetic regulators in RPL.     

Cytochrome P450 1A1 and manganese superoxide dismutase genes polymorphisms in ankylosing spondylitis

OBJECTIVES: To investigate the associations of cytochrome p450 1A1 (CYP1A1) and manganese superoxide dismutase (MnSOD) genes polymorphisms with the susceptibility to AS in Taiwan. METHODS: The polymorphisms of CYP1A1 and MnSOD genes were determined in 70 patients with ankylosing spondylitis (AS) and 93 healthy controls by polymerase chain reaction (PCR)/restriction fragment length polymorphisms (RFLP) methods. RESULTS: The genotype frequency of CYP1A1 4887C/A was significantly lower in patients with AS than in controls. The phenotype frequency of CYP1A1 4887A also tended to be decreased in patients with AS. There were no significant differences in the genotype, allele, and phenotype frequencies of MnSOD gene polymorphisms between patients with AS and controls. CONCLUSION: CYP1A1 4887A may be a protective factor for the development of AS in Taiwan. However, MnSOD gene polymorphisms are not associated with the susceptibility to AS.     

CYP1A1、CYP2D6基因多态性对白血病发生的影响

目的 分析细胞色素P450 CYP1A1和CYP2D6的多态性基因型在湖南地区白血病患者和健康人群中的分布及其对白血病发生的影响.方法 采用PCR及PCR-RFLP技术分析多态性基因型频率.结果 CYP1A1和CYP2D6基因的野生型、杂合突变型及纯合突变型的分布频率在急性淋巴细胞性白血病、急性非淋巴细胞性白血病、慢性粒细胞性白血病患者组与健康对照组之间无显著性差异;携带一个突变等位基因型的个体患白血病的风险与相应野生型携带者比较均无显著性差异;急性非淋巴细胞性白血病患者组的CYP1A1杂合突变型与CYP2D6杂合突变型的联合基因型频率高于健康对照组.结论 单独的CYP1A1或CYP2D6基因的多态性变异与白血病易感性不相关;CYP1A1杂合突变与CYP2D6杂合突变的联合基因型增加患急性非淋巴细胞性白血病的风险.     

Manganese superoxide dismutase and cytochrome P450 1A1 genes polymorphisms in rheumatoid arthritis in Taiwan

To investigate the role of manganese superoxide dismutase (MnSOD) and cytochrome P450 1A1 (CYP1A1) gene polymorphisms in the pathogenesis of rheumatoid arthritis (RA) in Taiwan, MnSOD and CYP1A1 genes polymorphisms were determined by he polymerase chain reaction/restriction fragment length polymorphism method in 112 patients with RA and 96 controls. There were no significant differences in the genotype, allele, and phenotype frequencies of MnSOD Ala-9Val (C1183T) polymorphisms between patients with RA and controls. The polymorphism of MnSOD 5777T, threonine at the 58th amino acid, cannot be found in RA patients and controls in Taiwan. The allele and phenotype frequencies of CYP1A1 4887A and genotype frequency of CYP1A1 4887C/A were lower in RA patients than in controls, whereas the significant difference was lost after correction. MnSOD C1183T polymorphisms were not associated with the clinical manifestations of RA. However, RA patients with CYP1A1 4889G/G have significantly higher frequency of Sj?gren's syndrome, especially in the presence of MnSOD 1183T/T. Patients with CYP1A1 4887C/A also have a trend to develop Sj?gren's syndrome in the presence of MnSOD 1183T/T. The linkage disequilibrium between CYP1A1 4889G and CYP1A1 6235C can be found in this study. MnSOD gene polymorphisms are not related to susceptibility to RA in Taiwan, whereas individuals with CYP1A1 4887A tend to avoid the development of RA. Moreover, CYP1A1 4889G/G and 4887C/A may play a role in the development of Sj?gren's syndrome, especially in the presence of MnSOD 1183T/T. These findings are preliminary. A further confirmation study is necessary.     

Interaction between cytochrome P450 gene polymorphisms and serum organochlorine TEQ levels in the risk of endometriosis

Exposure to dioxins and polychlorinated biphenyls (PCBs) has been suggested as a possible etiologic factor for endometriosis, but the association remains highly controversial. To assess whether cytochrome P450 (CYP) gene polymorphisms modulate the effect of dioxins and/or PCBs in endometriosis risk, we conducted a case-control study among infertile Japanese women. A total of 138 eligible women aged 20-45 were diagnosed laparoscopically and classified into three subgroups: control (no endometriosis), early endometriosis (stages I-II) and advanced endometriosis (stages III-IV). Neither CYP1A1 Ile462Val and CYP1B1 Leu432Val polymorphisms (genotypes with versus genotypes without the minor allele) nor serum dioxin and PCB toxic equivalency (TEQ) levels (low versus high) were independently associated with either early or advanced endometriosis risk. However, genotypes with the CYP1A1 462Val allele showed a statistically significant reduced risk of advanced endometriosis in combination with high serum dioxin TEQ levels (adjusted odds ratio = 0.13, 95% confidence interval: 0.02-0.76) (P for interaction = 0.08). Although no association was found between serum PCB TEQ level and advanced endometriosis in any stratum of CYP1B1 Leu432Val polymorphism, a statistically significant interaction was found (P for interaction = 0.05). CYP1A1 and CYP1B1 polymorphisms may modify the relation between environmental exposure to organochlorine and advanced endometriosis risk.