Objectives Tumor necrosis factor-α （TNF-α） may play an important role in host＇s immune response to mycobacterium tuberculosis （M. tuberculosis） infection. This study was to investigate the association of TNF-α...Objectives Tumor necrosis factor-α （TNF-α） may play an important role in host＇s immune response to mycobacterium tuberculosis （M. tuberculosis） infection. This study was to investigate the association of TNF-α gene polymorphism with pulmonary tuberculosis （TB） among patients with coal worker＇s pneumoconiosis （CWP）. Methods A case-control study was conducted in 113 patients with confirmed CWP complicated with pulmonary TB and 113 non-TB controls with CWP. They were matched in gender, age, job, and stage of pneumoconiosis. All participants were interviewed with questionnaires and their blood specimens were collected for genetic determination with informed consent. The TNF-α gene polymorphism was determined with polymerase chain reaction of restriction fragment length polymorphism （PCR-RFLP）. Frequency of genotypes was assessed for Hardy-Weinberg equilibrium by chi-square test or Fisher＇s exact probability. Factors influencing the association of individual susceptibility with pulmonary TB were evaluated with logistic regression analysis. Gene-environment interaction was evaluated by a multiplieative model with combined OR. All data were analyzed using SAS version 8.2 software. Results No significant difference in frequency of the TNF-α-308 genotype was found between CWP complicated with pulmonary TB and non-TB controls （2,2=5.44, P=-0.07）. But difference in frequency of the TNF-α-308 A allele was identified between them （2,2-5.14, P=0.02）. No significant difference in frequencies of the TNF-α-238 genotype and allele （P=0.23 and P=0.09, respectively） was found between cases and controls either, with combined （GG and AA） OR of 3.96 （95% confidence interval of 1.30-12.09） at the -308 locus of the TNF-α gene, as compared to combination of the TNF-α-238 GG and TNF-α-308 GG genotypes. Multivariate-adjusted odds ratio of the TNF-α-238 GG and TNF-α-308 GA genotypes was 1.98 （95% CI of 1.06-3.71） for risk for pulmonary TB in patients with CWP. There was a synergic interaction between the TNF-a-308 GG genotype and body mass index （OR=4.92）, as well as an interaction between the TNF-α-308 GG genotype and history of BCG immunization or history of TB exposure. And, the interaction of the TNF-α-238 GG genotype and history of BCG immunization or TB exposure with risk for pulmonary TB in them was also indicated. Conclusions TNF-α-308 A allele is associated with an elevated risk for pulmonary TB, whereas TNF-α-238 A allele was otherwise.展开更多
目的对于北京家族菌株占绝大多数的感染人群,评价多位点可变数量串联重复序列(variable number tandem repeats,VNTR)分析(multiple loci VNTR analysis,MLVA)中不同位点组合在结核分枝杆菌(Mycobacterium tuberculosis,MTB)基因分型研...目的对于北京家族菌株占绝大多数的感染人群,评价多位点可变数量串联重复序列(variable number tandem repeats,VNTR)分析(multiple loci VNTR analysis,MLVA)中不同位点组合在结核分枝杆菌(Mycobacterium tuberculosis,MTB)基因分型研究中的应用。并以IS6110限制性片段长度多态性(restriction fragment length polymorphism,RFLP)为参照,筛选有效位点。方法分别采用IS6110-RFLP、间隔区寡核苷酸分型(Spoligotyping)及MLVA不同位点组合对北京海淀区收集的MTB临床分离株进行基因分型研究,比较3种方法及MLVA不同位点组合的分型效果。结果 45株MTB分离株中86.7%为北京家族菌株,Spoligotyping和结核分枝杆菌散在分布重复单位(mycobacterial interpersed repetitive units,MIRU)-12系列的HGI(Hunter-Gaston Index)值分别为0.4313和0.8700,将45株MTB菌株分为10个和23个基因型。VNTR-9系列和IS6110-RFLP的分型结果一致,HGI值较高,为0.9980,将45株MTB菌株分为43个基因型。结论北京家族结核分枝杆菌在北京海淀区呈高水平流行。对于北京地区北京家族菌株占绝大多数的感染人群,VNTR-9系列MLVA是较为简便和高分辨率的分型方法 ,其分辨率能够达到MTB基因分型"金标准"IS6110-RFLP水平。展开更多
基金supported by grants from China National Programs for Science and Technology Development (Grant No. 2003BA712A11-24)Scientific Research Fund of North China Coal Medical College (Grant No. 2005-14)
文摘Objectives Tumor necrosis factor-α （TNF-α） may play an important role in host＇s immune response to mycobacterium tuberculosis （M. tuberculosis） infection. This study was to investigate the association of TNF-α gene polymorphism with pulmonary tuberculosis （TB） among patients with coal worker＇s pneumoconiosis （CWP）. Methods A case-control study was conducted in 113 patients with confirmed CWP complicated with pulmonary TB and 113 non-TB controls with CWP. They were matched in gender, age, job, and stage of pneumoconiosis. All participants were interviewed with questionnaires and their blood specimens were collected for genetic determination with informed consent. The TNF-α gene polymorphism was determined with polymerase chain reaction of restriction fragment length polymorphism （PCR-RFLP）. Frequency of genotypes was assessed for Hardy-Weinberg equilibrium by chi-square test or Fisher＇s exact probability. Factors influencing the association of individual susceptibility with pulmonary TB were evaluated with logistic regression analysis. Gene-environment interaction was evaluated by a multiplieative model with combined OR. All data were analyzed using SAS version 8.2 software. Results No significant difference in frequency of the TNF-α-308 genotype was found between CWP complicated with pulmonary TB and non-TB controls （2,2=5.44, P=-0.07）. But difference in frequency of the TNF-α-308 A allele was identified between them （2,2-5.14, P=0.02）. No significant difference in frequencies of the TNF-α-238 genotype and allele （P=0.23 and P=0.09, respectively） was found between cases and controls either, with combined （GG and AA） OR of 3.96 （95% confidence interval of 1.30-12.09） at the -308 locus of the TNF-α gene, as compared to combination of the TNF-α-238 GG and TNF-α-308 GG genotypes. Multivariate-adjusted odds ratio of the TNF-α-238 GG and TNF-α-308 GA genotypes was 1.98 （95% CI of 1.06-3.71） for risk for pulmonary TB in patients with CWP. There was a synergic interaction between the TNF-a-308 GG genotype and body mass index （OR=4.92）, as well as an interaction between the TNF-α-308 GG genotype and history of BCG immunization or history of TB exposure. And, the interaction of the TNF-α-238 GG genotype and history of BCG immunization or TB exposure with risk for pulmonary TB in them was also indicated. Conclusions TNF-α-308 A allele is associated with an elevated risk for pulmonary TB, whereas TNF-α-238 A allele was otherwise.
文摘目的对于北京家族菌株占绝大多数的感染人群,评价多位点可变数量串联重复序列(variable number tandem repeats,VNTR)分析(multiple loci VNTR analysis,MLVA)中不同位点组合在结核分枝杆菌(Mycobacterium tuberculosis,MTB)基因分型研究中的应用。并以IS6110限制性片段长度多态性(restriction fragment length polymorphism,RFLP)为参照,筛选有效位点。方法分别采用IS6110-RFLP、间隔区寡核苷酸分型(Spoligotyping)及MLVA不同位点组合对北京海淀区收集的MTB临床分离株进行基因分型研究,比较3种方法及MLVA不同位点组合的分型效果。结果 45株MTB分离株中86.7%为北京家族菌株,Spoligotyping和结核分枝杆菌散在分布重复单位(mycobacterial interpersed repetitive units,MIRU)-12系列的HGI(Hunter-Gaston Index)值分别为0.4313和0.8700,将45株MTB菌株分为10个和23个基因型。VNTR-9系列和IS6110-RFLP的分型结果一致,HGI值较高,为0.9980,将45株MTB菌株分为43个基因型。结论北京家族结核分枝杆菌在北京海淀区呈高水平流行。对于北京地区北京家族菌株占绝大多数的感染人群,VNTR-9系列MLVA是较为简便和高分辨率的分型方法 ,其分辨率能够达到MTB基因分型"金标准"IS6110-RFLP水平。
