着色性干皮病基因D多态性与慢性苯中毒发病风险

目的探讨XPD的基因多态性与个体慢性苯中毒发病风险的关系。方法采用病例-对照设计,以152名苯中毒工人为病例组,152名接触苯而没有中毒表现的工人为对照组。应用聚合酶链反应-限制性片断长度多态性分析技术(PCR-RFLP)检测XPDc.199、XPDc.201、XPDc.312和XPDc.751位点的多态性。结果未检测到XPDc.199、XPDc.201位点的突变基因型;与携带XPDc.312Asp/Asp基因型的个体相比,调整性别、工龄和暴露强度后,携带XPDc.312Asp/Asn+Asn/Asn基因型的个体的慢性苯中毒的发病风险降低(ORadj=0.59,95%CI=0.35～0.99,χ2=3.99,P0.05),在低强度苯接触组,该突变基因型的保护作用更为显著(ORadj=0.15,95%CI=0.04～0.51,χ2=8.93,P0.01)。结论XPDAsp312Asn基因多态可能与个体慢性苯中毒发病风险的改变有关。     

GSTO1-1基因多态性与地方性砷中毒易感性的关系研究

目的 探讨砷代谢相关酶谷胱甘肽S转移酶Omega 1-1(GSTO1-1)基因第4外显子多态性与地方性砷中毒患病风险的关系.方法 于2006年,采用聚合酶链反应-单链构象多态性(PCR-SSCP)技术对79名地方性砷中毒患者和110名正常人群外周血中GSTO1-1基因第4外显子的突变情况进行初筛,并进一步对异常带型进行直接DNA测序,以确定突变位点及类型,对多态性进行单因素分析和多因素非条件Logistic回归分析.结果 病例组131位密码子新的沉默突变131Ile(ATC)的携带率(2.5％)高于对照组(1.8％);病例组140位密码子突变140Asp的携带率(38.0％)高于对照组(32.7％);病例组155位密码子突变155Glu/Val的携带率(3.8％)高于对照组(2.7％),但差异均无统计学意义.在多因素非条件Logistic回归分析中调整年龄、性别等因素后,GSTO1-1基因多态性与地方性砷中毒发病仍无统计学意义.结论 GSTO1-1基因第4外显子上密码子131、140和155位点多态性与地方性砷中毒易感性无显著关系,出现这种情况的原因可能与分析的样本量较小、有关的多态性位点在GSTO1-1基因其他的外显子或非编码区上有关.     

XPC基因Ala499Val和Lys939Gln多态与癌症发病风险关联的meta分析

目的 为更清楚地了解NER通路上的XPC基因多态性与癌症发病风险的关联.方法 利用所有已发表的相关病例-对照研究对两个重要单核苷酸多态性位点:Ala499Val 和Lys939Gln进行了meta-分析.结果 Ala499Val位点的总体分析发现,499TT基因型的个体比499CT及499CC基因型个体,其癌症发病风险高25%(OR = 1.25,95% CI =1.09-1.44);499CT杂合基因型个体的癌症发病风险较纯合基因型个体低10% (OR = 0.90,95%CI = 0.84-0.97).Lys939Gln位点的总体分析发现,939CC基因型的个体比939CA与939AA基因型个体的癌症发病风险略高8% (OR = 1.08,95%CI = 1.00-1.16).此外,依据癌症种类和人群的不同对两个位点的亚组分析结果发现,Lys939Gln位点在高加索人群中与癌症发病风险显著相关.结论 499T和939C均为风险性的等位基因.499TT或939CC基因型的个体、尤其是939CC基因型的高加索人,有更高的癌症发生的可能性.     

GSTO1基因多态性与新疆饮水型地方性砷中毒的关联研究

目的探讨GSTO1基因多态性与饮水型地方性砷中毒易感性的关系。方法对新疆奎屯砷中毒病区慢性砷中毒患者96人,病区内对照组73人,以及非病区外对照组89人,应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术对GSTO1基因rs4925及rs11509438多态位点进行检测,用聚合酶链反应-双对引物多态性(PCR-CTPP)方法对GSTO1基因rs11509437位点进行检测,分析不同基因型与砷中毒发病风险的关系。结果 GSTO1基因rs4925、rs11509438及rs11509437位点的基因型以及等位基因频率在三组间的分布差异均无统计学意义(P0.05),GSTO1基因rs4925、rs11509438及rs11509437位点的基因多态性在不同砷暴露人群中的发病风险,差异均无统计学意义(P0.05)。结论 GSTO1基因rs4925、rs11509438及rs11509437位点可能与新疆饮水型地方性砷中毒无关联。     

hMTH1c.83及hOGG1c.326和hMYHc.335基因多态性与慢性苯中毒风险性的关系

目的 探讨hMTH1 Val83Met、hOGG1 Ser326Cys和hMYH His335Gln基因多态性与慢性苯中毒发病风险的关系.方法 采用病例对照设计,以152名苯中毒工人为病例组,152名接触苯而没有中毒表现的工人为对照组.应用聚合酶链反应-限制性片断长度多态性分析技术（PCR-RFLP）检测hMTH1c.83、hOGG1c.326和hMYH c.335位点的多态性.结果 携带hMTH1c.83Val/Met＋Met/Met和hOGG1 c.326 Cys/Cys基因型的个体发生慢性苯中毒的风险性分别是携带hMTH1c.83Val/Val和hOGG1c.326Ser/Cys＋Ser/Ser基因型个体的2.51倍（ORadj=2.51,95%CI：1.14～5.49,P=0.02）和2.49倍（ORadj=2.49,95%CI：1.52～4.07,P＜0.01）;相比于同时携带hOGG1c.326Cys/Cys和hMYHc.335His/His基因型的个体,同时携带hOGG1c.326Ser/Cys＋Ser/Ser和hMYHc.335His/Gln＋Gln/Gln两种基因型的个体有较低的慢性苯中毒发病风险（ORadj=0.33,95%CI=0.15～0.72,P=0.01）;在经常吸烟的人群中,携带hMYHc.335His/Gln＋Gln/Gln基因型的个体慢性苯中毒的发病风险较携带hMYHc.335His/His基因型的个体降低（ORadj=0.15,95%CI：0.03～0.68,P=0.01）.结论 hMTH1 Val83Met和hOGG1 Ser326Cys多态可能与个体慢性苯中毒的发病风险改变有关,而hOGG1 Ser326Cys和hMYHHis335Gln基因多态之间可能存在潜在的联合作用.     

NQO1基因多态性与慢性苯中毒遗传易感性的研究

目的　探讨NQO1基因多态性与慢性苯中毒遗传易感性之间的关系。方法　选择 10 0名慢性苯中毒工人为病例组及 90名同期接苯但无苯中毒表现的同工种工人为对照组 ,应用PCR RFLP方法判定NQO1基因型。结果　携带NQ0 1C6 0 9TT T基因型 (纯合突变型 )个体发生苯中毒的危险性是具有C T基因型 (杂合型 )和C C基因型 (野生型 )个体的 2 82倍 (95 %CI:1 4 2～ 5 5 8) ,是具有C C基因型 (野生型 )个体的 2 94倍 (95 %CI:1 2 5 - 6 90 ) ;并存在携带NQO1C6 0 9TT T基因型 (纯合突变型 )个体发生苯中毒的危险性高于携带NQO1C6 0 9TC T基因型 (杂合型 )个体、更高于C C基因型 (野生型 )个体的趋势 (χ2trend=6 0 1,P =0 0 14 )。结论　携带NQO1C6 0 9T纯合突变基因型 (T T)个体接苯时发生苯中毒的危险性增高 ,考虑此基因可作为易感性生物标志物 ,用于苯作业工人上岗前的筛检     

河南省人群五种基因多态性与肺癌易感性的关系

目的探讨河南省人群中外源性化合物代谢酶CYP1A1、GSTM1、GSTT1、mEH和DNA修复酶XRCC1基因多态性与肺癌易感性的关系。方法采用病例-对照研究的方法,选取河南省209例肺癌患者为病例组,256例健康体检者为对照组,应用聚合酶链反应-限制性片段长度多态性(PCR-RFLP)技术检测I相代谢酶基因CYP1A1,II相代谢酶基因GSTM1、GSTT1、mEH及DNA修复酶基因XRCC1的多态基因型。结果河南省人群中GSTM1缺失型,CYP1A1-exon7、mEH-exon3、XRCC1-194及XRCC1-280基因纯和突变型在病例组与对照组中的分布频率差异均有统计学意义(P<0.05),GSTM1基因缺失者与GSTM1基因阳性者相比发生肺癌的危险性升高(ORadj=1.76,95%CI:1.21-2.56,P=0.005);携带CYP1A1-exon7 Ile/val+val/val基因型的个体较携带CYP1A1-exon7 Ile/Ile基因型的个体发生肺癌的危险性升高(ORadj=1.65,95%CI:1.16-2.39,P=0.009);mEH-exon3突变基因型携带者与野生纯合型的个体相比发生肺癌的危险性升高(ORadj=1.77,95%CI:1.18-2.64,P=0.007);携带XRCC1-194 Arg/Trp+Trp/Trp基因型的个体较携带XRCC1-194 Arg/Arg基因型的个体发生肺癌的危险性升高(ORadj=1.55,95%CI:1.07-2.27,P=0.016);XRCC1-280 His/His基因型携带者较XRCC1-280 Arg/Arg+Arg/His基因型携带者发生肺癌的危险性升高(ORadj=2.21,95%CI:1.05-4.52,P=0.026)。CYP1A1-Msp1、GSTT1、mEH-exon4及XRCC1-399多态基因型在病例组与对照组中的分布频率差异均无统计学意义(P>0.05)。结论河南省人群中CYP1A1、GSTM1、GSTT1、mEH和XRCC1基因的分布与国内外相关报道有一定差异,其中CYP1A1-exon7、GSTM1、mEH-exon3、XRCC1-194及XRCC1-280基因位点的变异与河南省人群肺癌患癌危险度增高有关。     

HLA-DP基因多态性与卵巢癌临床病理参数的关联研究

目的探讨人类白细胞抗原(Human Leukocyte Antigens,HLA)DP基因多态性与卵巢癌临床病理参数的关联性。方法应用TaqMan探针方法,检测rs3077和rs9277535位点基因型,比较卵巢癌患者和健康对照者,探讨不同基因型与卵巢癌患病风险以及卵巢癌临床病理参数的关系。结果 rs3077和rs9277353位点突变纯合基因型AA病例组中占比均显著高于对照组(调整OR=1.82,95%CI:1.11~3.01;调整OR=1.89,95%CI:1.26~2.97);与携带rs3077 GG+GA和rs9377357GG+GA基因型的个体相比,携带1~2个危险基因型的个体发生卵巢癌的风险显著(P0.01);尚未发现HLADP基因遗传多态性与卵巢癌临床病理参数存在关联。结论 HLA-DP基因多态性与卵巢癌的发病风险存在关联。     

p53基因多态性与中国人群食管癌易感性的Meta分析

目的 探讨p53基因多态性与中国人群食管癌易感性的关系.方法 检索CBMdisc,CMCC,CNKI,Medline,Pubmed,ScienceDirect,Springer Link等数据库,并收集未公开发表的文章及硕、博士学位论文,获得有关p53基因多态性与中国人群食管癌易感性的关系的文献.确定文献的纳入和排除标准,对文献进行筛选,然后应用Meta分析软件RevMan 5.1对各研究原始数据进行统计处理,以病例组及对照组p53基因型分布的比值比(OR值)为效应指标,计算合并OR值及95％可信区间,发表偏倚用漏斗图和Egger's线性回归检验来评估并进行敏感性分析.结果 携带杂合基因型(Arg/Pro)的个体发生食管癌的危险性是野生纯合型(Arg/Arg)的1.12倍(OR=1.12,95％CI:1.01～1.25),携带突变纯合基因型(Pro/Pro)的个体发生食管癌的危险性是野生纯合型(Arg/Arg)的1.43倍(OR=1.43,95％CI:1.15～1.78).结论 表明与野生纯合型(Arg/Arg)相比,携带杂合基因型(Arg/Pro)和突变纯合基因型(Pro/Pro)可显著增加食管癌发病风险性.     

人类白细胞抗原-DP基因多态性与卵巢癌患者临床病理参数的相关性分析

目的探讨人类白细胞抗原-DP (HLA-DP)基因多态性与卵巢癌患者临床病理参数的相关性,为临床诊治卵巢提供参考依据。方法应用Taq Man探针方法检测248例卵巢癌患者和454例健康对照组rs3077和rs9277535位点基因型,比较不同基因型与卵巢癌患病风险以及卵巢癌患者临床病理参数的相关性。结果 rs3077和rs9277535位点突变纯合基因型AA在病例组人群中均显著高于对照组(调整OR=1.82,95%CI=1.11～3.01;调整OR=1.89,95%CI=1.26～2.97);此外,与携带rs3077 GG+GA和rs9277535 GG+GA基因型的个体相比,携带1～2个危险基因型的个体发生卵巢癌的风险显著,差异有统计学意义(P0.01);然而,未发现HLA-DP基因遗传多态性与卵巢癌临床病理参数存在相关性。结论 HLA-DP基因多态性与卵巢癌的发病风险存在关联。     

Association between GSTO2 polymorphism and the urinary arsenic profile in copper industry workers

Two members of the recently identified Omega class glutathione S-transferase enzymes (GSTO1 and GSTO2) have been proposed to play a role in the response to arsenic exposure. Therefore, polymorphisms in these genes could be related with variations in the arsenic excretion profile and, consequently, with the individual response to chronic exposure. Exons and flanking regions of GSTO2 gene have been screened in two different ethnic groups (20 Europeans and 20 Chilean Indians), and the urinary arsenic patterns and the GSTO2 Asn142Asp polymorphism have been investigated in 207 copper mine workers occupationally exposed to arsenic. Three polymorphisms of GSTO2 already described were detected in Europeans and Chilean Indians, although with significant different allele frequencies. The genotyping for the Asn142Asp polymorphism revealed that almost no significant association exists between this change and the arsenic excretion profile. However, 142Asp change seems to be correlated with an increase in DMA excretion after age and total urinary arsenic adjustment (OR=3.61; P=0.05). Altogether, our findings indicate that ethnical differences should be taken into account for correlation studies between GST Omega polymorphisms and arsenic susceptibility, and that the 142Asp allozyme could modulate arsenic biotransformation and thereby arsenic toxicity.     

APE1基因和ADPRT基因多态与慢性苯中毒易感性的关系

目的探讨脱嘌呤/脱嘧啶核酸内切酶（APEl）和腺苷酸二磷酸核糖基转移酶（APDRT）的基因多态与慢性苯中毒易感性的关系.方法采用病例对照研究,以152名苯中毒工人为病例组,152名接触苯而无中毒表现的工人为对照组.应用创造酶切位点的限制性片断长度多态检测技术（CRS-RFLP）检测APE1基因Asp148Glu位点和ADPRT基因Val762Ala位点的多态性.结果APE1 Asp148Glu多态与ADPRT Val762Ala多态的各基因型在病例组和对照组的分布差异无统计学意义（P＞0.05）;携带APE1 Asp148Glu Asp/Asp基因型的饮酒个体比携带该基因型的不饮酒个体发生慢性苯中毒的危险性升高（OR=4.13,95% CI：1.07～15.85,P=0.03）;多因素Logistic回归分析提示,吸烟对慢性苯中毒发病风险具有一定的修饰作用（OR=0.33,95% CI：0.14～0.75,P=0.01）.结论APE1 Asp148Glu和ADPRT Val762Ala位点多态与慢性苯中毒的发病风险没有关系.饮酒与APE1 Asp148Glu多态可能存在联合作用,仍需进一步研究确定.     

Significantly increased risk of carotid atherosclerosis with arsenic exposure and polymorphisms in arsenic metabolism genes

Individual susceptibility to arsenic-induced carotid atherosclerosis might be associated with genetic variations in arsenic metabolism. The purpose of this study is to explore the interaction effect on risk of carotid atherosclerosis between arsenic exposure and risk genotypes of purine nucleoside phosphorylase (PNP), arsenic (+3) methyltransferase (As3MT), and glutathione S-transferase omega 1 (GSTO1) and omega 2 (GSTO2). A community-based case-control study was conducted in northeastern Taiwan to investigate the arsenic metabolic-related genetic susceptibility to carotid atherosclerosis. In total, 863 subjects, who had been genotyped and for whom the severity of carotid atherosclerosis had been determined, were included in the present study. Individual well water was collected and arsenic concentration determined using hydride generation combined with flame atomic absorption spectrometry. The result showed that a significant dose–response trend (P=0.04) of carotid atherosclerosis risk associated with increasing arsenic concentration. Non-significant association between genetic polymorphisms of PNP Gly51Ser, Pro57Pro, As3MT Met287Thr, GSTO1 Ala140Asp, and GSTO2 A-183G and the risk for development of carotid atherosclerosis were observed. However, the significant interaction effect on carotid atherosclerosis risk was found for arsenic exposure (>50 μg/l) and the haplotypes of PNP (p=0.0115). A marked elevated risk of carotid atherosclerosis was observed in subjects with arsenic exposure of >50 μg/l in drinking water and those who carried the PNP A–T haplotype and at least either of the As3MT risk polymorphism or GSTO risk haplotypes (OR, 6.43; 95% CI, 1.79–23.19). In conclusion, arsenic metabolic genes, PNP, As3MT, and GSTO, may exacerbate the formation of atherosclerosis in individuals with high levels of arsenic concentration in well water (>50 μg/l).     

Genetic variants associated with arsenic susceptibility: study of purine nucleoside phosphorylase, arsenic (+3) methyltransferase, and glutathione S-transferase omega genes

BACKGROUND: Individual variability in arsenic metabolism may underlie individual susceptibility toward arsenic-induced skin lesions and skin cancer. Metabolism of arsenic proceeds through sequential reduction and oxidative methylation being mediated by the following genes: purine nucleoside phosphorylase (PNP), arsenic (+3) methyltransferase (As3MT), glutathione S-transferase omega 1 (GSTO1), and omega 2 (GSTO2). PNP functions as arsenate reductase; As3MT methylates inorganic arsenic and its metabolites; and both GSTO1 and GSTO2 reduce the metabolites. Alteration in functions of these gene products may lead to arsenic-specific disease manifestations. OBJECTIVES: To find any probable association between arsenicism and the exonic single nucleotide polymorphisms (SNPs) of the above-mentioned arsenic-metabolizing genes, we screened all the exons in those genes in an arsenic-exposed population. METHODS: Using polymerase chain reaction restriction fragment length polymorphism analysis, we screened the exons in 25 cases (individuals with arsenic-induced skin lesions) and 25 controls (individuals without arsenic-induced skin lesions), both groups drinking similar arsenic-contaminated water. The exonic SNPs identified were further genotyped in a total of 428 genetically unrelated individuals (229 cases and 199 controls) for association study. RESULTS: Among four candidate genes, PNP, As3MT, GSTO1, and GSTO2, we found that distribution of three exonic polymorphisms, His20His, Gly51Ser, and Pro57Pro of PNP, was associated with arsenicism. Genotypes having the minor alleles were significantly overrepresented in the case group: odds ratio (OR) = 1.69 [95% confidence interval (CI), 1.08-2.66] for His20His; OR = 1.66 [95% CI, 1.04-2.64] for Gly51Ser; and OR = 1.67 [95% CI, 1.05-2.66] for Pro57Pro. CONCLUSIONS: The results indicate that the three PNP variants render individuals susceptible toward developing arsenic-induced skin lesions.     

XRCC1基因多态性与慢性苯中毒易感性关系探讨

目的　探讨X线修复交叉互补基因 1(XRCC1基因 )的多态性与慢性苯中毒易感性的关系。方法　采用病例 -对照设计 ,以 15 2名苯中毒工人为病例组 ,15 2名接触苯而没有中毒表现的工人为对照组 ,应用聚合酶链反应 -限制性片段长度多态性分析技术 (PCR RFLP)检测XRCC1基因c.194、c.2 80和c.399位点的多态。结果　病例组中携带XRCC1c.194Arg Trp +Trp Trp基因型的个体的比例显著低于对照组 ,而携带XRCC1c .2 80Arg His+His His基因型的个体的比例显著高于对照组 ;携带XRCC1c.194Arg Trp +Trp Trp基因型的个体发生苯中毒的危险性较携带XRCC1c .194Arg Arg基因型的个体降低 1 6 7倍 (ORadj=0 6 0 ,95 %CI:0 37～ 0 97,P =0 0 39) ,而携带XRCC1c.2 80Arg His+His His基因型的个体发生苯中毒的危险性是携带XRCC1c.2 80Arg Arg基因型个体的 1 91倍 (ORadj =1 91,95 %CI:1 17～ 3 10 ,P =0 0 0 9)。结论　携带有XRCC1c .194Arg Trp +Trp Trp基因型的个体有较低的慢性苯中毒发病风险 ,而携带有XRCC1c.2 80Arg His+His His基因型的个体发生慢性苯中毒的风险性可能增高     

中国老年人HDAC9和PPP3CA基因多态性与衰弱的关联

  目的  探讨组蛋白去乙酰化酶9(histone deacetylase 9, HDAC9) rs2074633及钙调神经磷酸酶催化亚基A(calcineurin catalytic subunit A, PPP3CA) rs17030795的多态性与中国老年人衰弱发生的关联。  方法  本研究纳入衰弱组665例,对照组3 388例。基于基因型频率及五种遗传模型(共显性、加性、显性、隐性和超显性),评估rs2074633及rs17030795多态性与衰弱之间的关联。  结果  在共显性模型中,与携带rs2074633 TT基因型相比,携带TC型(OR=1.99,95% CI: 1.36~2.90)、CC型(OR=2.15,95% CI: 1.48~3.13)的个体发生衰弱的风险增加;在加性(OR=1.28,95% CI: 1.11~1.47)、显性(OR=2.07,95% CI: 1.44~2.98)及隐形模型(OR=1.21,95% CI: 1.01~1.45)中rs2074633多态性均增加衰弱的发生风险;在共显性模型中,与携带rs17030795 AA基因型相比,携带AG(OR=1.72,95% CI: 1.19~2.51)、GG(OR=1.98,95% CI: 1.37~2.87)型的个体发生衰弱的风险增加;在加性(OR=1.28,95% CI: 1.11~1.48)、显性(OR=1.85,95% CI: 1.29~2.66)及隐性(OR=1.25,95% CI: 1.04~1.50)中rs17030795多态性均增加衰弱的发生风险。   结论  HDAC9 rs2074633及PPP3CA rs17030795多态性与中国老年人衰弱发生风险有关。     

细胞色素P450 1A1和2D6基因多态性与慢性苯中毒的危险性

目的 探讨细胞色素P450 1A1和2D6基因多态性与慢性苯中毒易感性的关系.方法 采用病例-对照研究,选择152名苯中毒工人为病例组,152名接触苯而无中毒表现的工人为对照组.采用限制性片段聚合酶链反应（PCR-RFLP）技术检测CYP1A1基因3＇端非编码区MspⅠ和CYP2D6第1外显子c.188位点、g.212位点多态性.结果 携带CYP1A1 MspⅠT/T基因型的个体发生苯中毒的危险性是携带有CYP1A1 Msp Ⅰ T/C或C/C基因型的个体的1.32倍（95%CI：1.05～1.65,P=0.02）;在不吸烟的人群中,携带CYP1A1 MspⅠ T/T基因型的个体发生苯中毒的风险性是携带T/C或C/C基因型的个体的1.56倍（95%CI：1.15～2.12,P=0.003）;携带有CYP2D6 c.188 C/C或C/T基因型个体发生苯中毒的危险性是携带有CYP2D6 c.188 T/T基因型的个体的1.23倍（95%CI：1.05～1.42,P=0.01）,在不吸烟的人群中,携带CYP2D6 c.188 C/C或C/T基因型个体发生苯中毒的危险性是携带有CYP2D6 c.188 T/T基因型的个体的1.23倍（95%CI：1.04～1.47,P=0.01）.未发现研究对象的CYP2D6g.212位点存在多态性.结论 携带CYP1A1 Msp ⅠT/T基因型、CYP2D6 c.188 C/C和C/T基因型个体对苯中毒可能易感.     

HO-1基因BccI位点多态性与职业性慢性锰中毒易感性关系的病例对照研究

目的探讨血红素加氧酶-1(HO-1)基因BccI位点多态性与职业性慢性锰中毒遗传易感性的关系。方法采用1∶2配对病例-对照研究的方法,应用聚合酶链反应-限制性片段长度多态性技术(PCR-RFLP)测定200例职业性慢性锰中毒患者与400例对照组HO-1基因BccI位点基因型,统计分析基因多态性与职业性慢性锰中毒的关系。结果未发现突变纯合基因型;HO-1基因BccI位点等位基因及基因型在对照组和病例组中分布差异无统计学意义;在男性病例组与对照组中的分布差异亦无统计学意义;但分层分析后发现在工龄20～29 a的对照组和病例组中,等位基因S携带者发生职业性慢性锰中毒的危险性为R的2.632倍(95%CI=1.210～5.724),携带基因型RS的个体患职业性慢性锰中毒的危险性是携带基因型RR个体的2.788倍(95%CI=1.251～6.216)。结论未发现HO-1基因BccI位点基因多态性与职业性慢性锰中毒的易感性有关,但发现在工龄20～29 a的人群中携带S等位基因或具有RS基因型的个体发生职业性慢性锰中毒的危险性增加。     

环氧化物水解酶基因多态性与慢性苯中毒易感性关系的研究

目的　探讨环氧化物水解酶 (mEH)的基因多态性和慢性苯中毒易感性的关系。方法　采用病例 -对照研究 ,以 15 2名苯中毒工人为病例组 ,15 2名接触苯而没有中毒表现的工人为对照组。应用多聚酶链反应 -限制性长度多态性分析技术 (PCR RFLP)检测mEH基因c .113和c.139位点的多态性。结果　携带mEHc .113C C基因型的个体发生苯中毒的危险性为携带有mEHc .113T T和T C基因型个体的 0 .6 0 (OR =0 .6 0 ,95 %CI:0 .37～ 0 .97,P =0 .0 4 ) ;在不吸烟的人群中 ,携带mEHc .113C C基因型的个体苯中毒的发病风险为携带T T和T C基因型的个体 0 .5 6 (OR =0 .5 6 ,95 %CI:0 .33～ 0 .96 ,P =0 .0 3) ;在不饮酒的人群中 ,携带有mEHc .113C C基因型又不饮酒的个体发生苯中毒的危险性为携带有mEHc .113T T和T C基因型的个体 0 .5 1(OR =0 .5 1,95 %CI:0 .30～ 0 .86 ,P =0 .0 1)。结论　携带有mEHc .113C C基因型 ,同时又不吸烟或不饮酒的个体发生慢性苯中毒危险性较低。     

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。