甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流行性感冒病毒血凝素蛋白基因进化研究

Objective To determine the evolutionary rate and divergence time of influenza A virus HA gene isolated recently worldwide pandemic and explore the origin and its transmission. Methods A total of 344 HI sequences available in the GenBank (including 248 isolated from human, 84 from swine, 11 from avian, and 1 from ferret) and 7 isolated in Shanghai were collected. The nucleotide substitution rate and time to most recent common ancestor (tMRCA) was calculated using molecular clock theory and Bayesian Skyline Plot (BSP) based on Markov chain Monte Carlo. Then genetic phylogeny was constructed referring to posterior distribution. Results It was found that H1 sequences in the US from human, swine and avian were clustered significantly with swine H1 ones from Asia phylogenetieally (Cluster US). The second cluster (Cluster Eurasian Human) nearly consisted of human H1 sequences isolated in other regions. The third cluster (Cluster Eurasian Animal) consisted of swine and avian H1 sequences from China and Italy respectively. As for all the H1 sequences, the evolutionary rate was of 2.57×10-3substitutions/site per year averagely (95% Highest Posterior Density: 1.96×10-3-3.03×10-3/site per year). The estimated dates for tMRCA of human H1 in Europe and swine H1 in the mainland of China were the earliest, with the corresponding rates of 6.46×10-3/site per year and 0.97×10-3/site per year respectively. The tMRCAs of human and swine H1 sequences from the US were similar, with the rates of 5.86×10-3/site per year and 5.02×10-3/site per year. Conclusion The present flu outbreak was possibly induced by long-term circulation of influenza A virus (H1 N1) in human population and swine herds in America. There was no evidence proving that influenza virus in China involved in the present outbreak.     

甲型H1N1流感病毒基因组序列分析及其特性研究

Objective To analyse the genome of influenza A (H1N1) vires so as to elucidate its molecular characteristics and evolution status. Methods DNA sequences of the influenza viruses were collected from NCBI, and compared with the genomes of referenced intluenza viruses. The phylogenetic trees were constructed by the neighbor-joining method, and the pathogenicity, drug susceptibility and vaccine protection were analyzed. Results Phyiogenetic analysis showed that the genes encoding HA, PB2, PBI, PA, NP, and NS protein were most closely related to those influenza A viruses circulating in swine populations in North America. NA and M gene belonged to Eurasia lineages swine influenza vires. The amino acid sequence of the cleavage site between HA1 and HA2 was PARSSR ↓ GLFGAI with the typical characteristics of the low pathogenic influenza virus. Influenza A(H1N1) virus can spread from person-to-person. It is sensitive to oseltamivir and zanamivir but resistant to amantadine and remantadine. The current human seasonal influenzavaccines confered little protection against influenza A/H1N1 because of the great diversity on antigenic domains between A/H1N1 virus and vaccine virus. Conclusions Influenza A(H1N1) virus is a reassortant virus of North America and Eurasia hneages swine influenza virus. It is important to develop a vaccine against the currently circulating virus strain to control the disease spread.     

CYP1A1、GSTT1、GSTM1基因与乳腺癌易感性的病例对照研究

目的探讨雌激素代谢通路相关基因CYP1A1、GSTT1、GSTM1与乳腺癌易感性的关系。方法采用聚合酶链反应(PCR)、限制性片段长度多态性(RFLP)及琼脂糖凝胶电泳法,对天津市360例正常女性和315例女性乳腺癌患者的CYP1A1、GSTT1、GSTM1基因及多态性进行检测,Logistic回归分析评估单基因、联合基因以及相关因素对乳腺癌的危险度。结果 CYP1A1基因、GSTT1基因、GSTM1基因在两组间分布频率有差异(χ2值分别为20.677,47.250,43.621,P=0.000)。基因型联合分析显示,随着携带危险基因型数目的增加,个体罹患乳腺癌的危险性增加(χ2=51.366,P=0.000)。多因素非条件Logistic回归分析结果显示,CYP1A1基因与体育锻炼、摄入肉类(每日多于150g)、摄入蔬菜(每日超过300g)的交互作用有统计学意义[OR(95%CI)分别为0.465(0.362～0.597)、1.559(1.344～1.808)、0.465(0.362～0.597)];GSTT1基因缺失、GSTM1基因缺失是乳腺癌的危险因素[OR(95%CI)分别为3.245(1.645～6.375)、2.462(1.818～3.334)],且GSTT1基因与体育锻炼、累计行经年数的交互作用有统计学意义[OR(95%CI)分别为1.546(1.113～2.147)、3.735(1.401～9.956)],GSTM1基因与哺乳期限、绝育手术的交互作用有统计学意义[OR(95%CI)分别为1.206(1.024～1.420)、1.690(1.353～2.111)]。结论雌激素代谢通路相关基因与乳腺癌发生有关,且其与雌激素暴露影响因素、生活方式等存在交互作用。     

铜川市甲型流感监测流行情况

目的通过甲型流感监测,探索铜川市2009年9月-2010年1月该病流行趋势。方法实时荧光定量PCR方法 (Real-timePCR)。结果共监测476份样本,阳性184份,阳性率38.7%。结论 184份阳性标本中,甲型H1N1阳性样140份,阳性率76.1%。     

1起甲型H1N1流感暴发的调查

[目的]总结甲型H1N1流感暴发的经验、教训,为今后处理类似突发事件提供参考。[方法]采用现况调查的方法,对2009年10月发生在青岛某大学费县校区学生中的甲型H1N1流感暴发疫情进行调查。[结果]此次甲型H1N1流感暴发共发病16例,罹患率为0.28%。病例分布在2个年级、9个班,发病年龄为18-21岁,男生11例,女生5例,男女之比为2.20∶1。患者临床表现为发热、头痛、头晕、咳嗽、腰腿酸痛等症状。无明确与甲型H1N1流感病例和流感样病例接触史。[结论]这是1起发生在学校由甲型H1N1流感病毒感染引起的暴发疫情,控制措施及时有效。     

环境外暴露及GSTT_1、GSTM_1基因型对1-羟基芘作为多环芳烃暴露标志物的影响

目的研究多环芳烃(PAHs)暴露(环境空气暴露和吸烟)、GSTT1、GSTM1基因型对1-羟基芘(1-OHP)作为PAHs暴露标志物的影响。方法选取51名巡警作为研究组,48名内勤警察作为对照组,测定两组人群环境空气中的PAHS浓度以及尿中的1-OHP浓度,采用HPLC方法分析环境空气中PAHs浓度和研究对象尿样中的1-OHP;PCR方法测定GSTT1、GSTM1基因型。结果对照组环境PAHs浓度为12.79ng/m3,研究组为20.85ng/m3。研究组、对照组内部相同吸烟条件下GSTT1、GSTM1不同基因型人群尿中1-OHP浓度没有差别,相同基因型下的非吸烟人群中,对照组尿中1-OHP浓度均小于研究组,吸烟人群中没有发现同样的规律。按吸烟分层后,研究组、对照组内部吸烟者尿中的1-OHP浓度均大于非吸烟者,并且对照组吸烟者尿中1-OHP浓度大于研究组非吸烟者。结论PAHs暴露及吸烟是影响尿中1-OHP浓度的重要因素;在环境空气中PAHs浓度较低的情况下,吸烟对尿中1-OHP浓度的贡献更大。但GSTT1、GSTM1基因型不是影响尿中1-OHP浓度的主要因素。     

HIV-1 Tat对细胞周期蛋白的影响

目的研究HIV-1 Tat对细胞周期蛋白(cyclinB1)的影响。方法利用人横纹肌肉瘤细胞(TE671)及已转染tat基因的TE671细胞(TT2)细胞系;通过Western印迹检测辐射前后CyclinB1表达变化;使用Northern-Blot及半定量RT-PCR,分析cyclinB1在mRNA水平表达;放线菌酮阻断蛋白合成实验及免疫共沉淀实验检测cyclinB1的稳定性。结果细胞在接受电离辐射和未接受照射情况下,cyclin B1的表达在转染tat基因细胞中明显增强,Tat蛋白不影响cyclinB1在mRNA水平的表达;放线菌酮阻断蛋白合成实验及Tat蛋白诱导细胞电离辐射后泛素化实验均表明,cyclinB1表达水平的增强主要发生在蛋白质合成后的修饰。结论 HIV-1 Tat蛋白能提高Cyclin B1的稳定性,降低CyclinB1泛素化水平;该项研究也许有助于利用分子生物学手段,干预Tat蛋白的表达以调控CyclinB1及相关蛋白的表达,进而改变肿瘤细胞周期的进程,影响临床的疗效。     

CYP1A1和GSTM1基因多态与肺癌发病关系的病例-对照研究

目的 探讨肺癌易感性标记物CYP1A1及GSTM1基因多态以及吸烟等其他环境暴露因素与肺癌发生的关系。方法 采用病例-对照研究的方法，收集原发性肺癌病例91例以及非肺部疾患的住院病例(对照)91例，所有的研究对象均采静脉血进行DNA抽提，并用PCR方法检测CYP1A1以及GSTM1基因多态，同时调查研究对象吸烟等其他环境暴露因素。应用Logistic回归分析方法进行单因素和多因素的分析。结果 无论是单因素分析还是多因素分析均未显示出CYP1A1和GSTM1基因多态与肺癌发病的关联。多因素分析结果表明：化程度的OR为0．63(95％CI：0．45～0．86)，吸烟量的OR为1．56(95％CI：1．14～2．14)，无抽油烟机的OR为3．77(95％CI：1．48～9．56)，食用动物油的OR为1．67(95％CI：1.25～2．24)，常吃胡萝卜的OR为0．47(95％CI：0．22～0．98)，饮酒的OR为6．58(95％CI：1.53～28．30)，家族肺癌史的OR为3．75(95％CI：1．64～8．58)。结论 CYP1A1和GSTM1基因多态与肺癌发病无明显的关联，吸烟、饮酒、食用动物油、家族肺癌吏以及无抽油烟机是肺癌的危险因素，而高化程度和常吃胡萝卜与降低肺癌风险有关。     

吸烟者CYP1A1和GSTM1基因多态性与DNA损伤关系

[目的]探讨吸烟者Ⅰ相代谢酶CYP1A1和Ⅱ相代谢酶GSTM1基因多态性与DNA损伤的关系。[方法]选择吸烟量、性别、年龄、生活方式基本相同的吸烟者123例,应用Pyrosequencing技术进行个体基因型测定,彗星试验测定外周血淋巴细胞DNA损伤程度。[结果]在123名吸烟者中,CYP1A1突变型(CYP1A1Val/Val)占CYP1A1等位基因型的28.5%,GSTM1缺失型(GSTM1null)占GSTM1等位基因型的56.1%。具有CYP1A1Val/Val和GSTM1null基因型的个体有19名,占吸烟者总数的15.4%。同时具CYP1A1突变型和GSTM1缺失型纯合个体,淋巴细胞的拖尾形成率为97.5%,尾长达120.9μm,尾矩为42.4μm,显著高于野生型个体(P<0.05),且尾部DNA的荧光强度明显升高,而突变杂合型个体DNA损伤无明显加重。[结论]CYP1A1突变型与GSTM1缺失型共同携带者对DNA损伤敏感,多个突变基因对DNA损伤可能具有协同作用。     

CYP1A1、GSTM1基因多态性与食管癌遗传易感性

目的探讨细胞色素氧化酶P450(CYP)1A1、谷胱苷肽硫转移酶(GSTM1)的基因多态性与食管癌遗传易感性关系．以及基因-基因、基因-环境之间的交互作用。方法收集新发食管癌患者89例(病例组)及同期非食管疾患患者98例(对照组)，调查与食管癌相关的危险因素；基因多态性检测采用聚合酶链式反应(PCR)和限制性片段长度多态性(RFLP)方法；比较病例组和对照组CYP1A1的MspI多态、Ile／Val多态和GSTM1基因多态性的分布情况，并结合环境因素进行单因素、多因素Logistic回归分析以及联合作用分析。结果MspI多态的突变型杂合子m1／m2(基因型B)和突变型纯合子m1／m2(基因型C)在病例组与对照组的分布差异有统计学意义，ORB值为1．93(95％CI=1．01—3.84)，ORC值为3．62(95％CI=1．61～8．14)，Ile／Val多态的突变型和GSTM1缺失型在两组的分布差异无统计学意义：MspI多态的突变型和GSTM1缺失型对食管癌发生的交互作用差异有统计学意义，OR值为3．57(95％CI=1．36～9．41)；MspI多态的突变型与摄入较多新鲜蔬菜水果和蛋类呈拮抗作用，联合作用指数(S)分别为0．26和0．48．MspI多态的突变型与食管癌家族史呈协同作用，S为2．36。结论MspI多态的突变型与食管癌易感性有关，它与摄入较多新鲜蔬菜水果和蛋类及食管癌家族史对食管癌的发生存在交互作用；具有MspI突变基因型和或食管癌家族史的个体属食管癌高危险人群，在肿瘤防治方案中应加以注意。     

HIV-1潜伏和储存库研究进展

目前,无法根治HIV-1感染的主要障碍在于病毒可以在被它感染的某些细胞亚群中保持潜伏状态,即使成功应用HAART,潜伏的感染细胞也能够通过逃避病毒引起的免疫应答而存活很长时间.如果加以适当刺激,潜伏的细胞能够重新活化,产生具有感染性的病毒体.此文对HIV-1潜伏的机制和储存库研究进展进行了综述.     

HIV-1潜伏和储存库研究进展

目前,无法根治HIV-1感染的主要障碍在于病毒可以在被它感染的某些细胞亚群中保持潜伏状态,即使成功应用HAART,潜伏的感染细胞也能够通过逃避病毒引起的免疫应答而存活很长时间.如果加以适当刺激,潜伏的细胞能够重新活化,产生具有感染性的病毒体.此文对HIV-1潜伏的机制和储存库研究进展进行了综述.