Objective: To study the relationship between the polymorphism of drug resistant gene rpoB and drug resistance against rifampicin(RFP) of M. tuberculosis L-forms, and to evaluate its clinical application. Methods: A to...Objective: To study the relationship between the polymorphism of drug resistant gene rpoB and drug resistance against rifampicin(RFP) of M. tuberculosis L-forms, and to evaluate its clinical application. Methods: A total of 52 clinical isolated strains of M. tuberculosis L-forms were collected. rpoB gene polymorphism was analyzed by polymerase chain reaction and single-strand conformation polymorphism (PCR-SSCP) and conventional antimicrobial susceptibility test (AST). Their results were compared. Results: AST results showed that 38 of 52 clinical isolated strains were drug resistance (73.08％),while PCR-SSCP indicated 65.38％ (32/52) rpoB gene polymorphism. There was no statistic significance(χ2= 2.4914) between the 2 methods. Conclusion:Combined the application of PCR-SSCP with AST in detecting rpoB drug resistant gene polymorphism of M. tuberculosis L-form from pneumoconiosis patients with tuberculosis may have advantages at earlier diagnosis and guidance of clinical medications.展开更多
目的研究原发性肝癌拓扑异构酶Ⅱα(Topoisom eraseⅡ,αToPoⅡα)的表达及临床意义,并探讨其与p53基因突变之间的关系。方法免疫组织化学法和W estern B lotting方法检测57例未经化疗过的原发性肝癌肿瘤组织和32例肝硬化组织ToPoⅡα...目的研究原发性肝癌拓扑异构酶Ⅱα(Topoisom eraseⅡ,αToPoⅡα)的表达及临床意义,并探讨其与p53基因突变之间的关系。方法免疫组织化学法和W estern B lotting方法检测57例未经化疗过的原发性肝癌肿瘤组织和32例肝硬化组织ToPoⅡα蛋白的表达,并用聚合酶链反应-单链构象多态性(PCR-SSCP)分析p53基因7、8外显子的突变。结果To-PoⅡα蛋白在肝癌组织中阳性率为87.7%(50/57),在肝硬化组织中阳性率为50%(16/32),两者有显著差异(P<0.05)。蛋白印迹结果显示肝癌组织中ToPoⅡα蛋白表达显著高于肝硬化组织(P<0.05),高分化肿瘤与中、低分化的肿瘤组织之间有显著差异(P<0.05),有转移的病人高于无转移者(P<0.05).等级相关分析显示ToPoⅡα蛋白的表达与p53基因突变呈正相关(r=0.914,P=0.001)。p53基因突变组ToPoⅡ蛋白的表达显著高于野生型组(P<0.01)。结论ToPoⅡα的检测可作为肝癌分化程度的特异指标,同时p53基因突变可能诱导ToPoⅡα蛋白的表达。展开更多
Objective：To study the genetic variation of mitochondrial DNA （mtDNA） among common laboratory strains of inbred mice. Methods： The genetic polymorphism of mtDNA among 4 classical laboratory strains of inbred mice ...Objective：To study the genetic variation of mitochondrial DNA （mtDNA） among common laboratory strains of inbred mice. Methods： The genetic polymorphism of mtDNA among 4 classical laboratory strains of inbred mice and 3 inbred strains of mice established in China was analyzed by polymerase chain reaction coupled with restriction fragment length polymorphism（PCR-RFLP） and PCR coupled with single-stranded conformation polymorphism（PCR-SSCP）. Results： With regard to the D-loop （Displacement loop, D-loop）, tRNA^ Met＋Glu＋Ile, and ND3 （NADH dehydrogenase subunit 3, ND3） gene fragments of mtDNA from these mice,no variation was revealed by PCR-RFLP at 46 restriction enzyme sites. Further analyzed by PCR-SSCP,the D-loop 5＇fragment and 3＇end fragment of mtDNA from these mice also showed no genetic variation. Conclusion： Owing to maternal mode of inheritance of mtDNA,the results indicate that these common inbred strains of mice share the same maternal lineage.展开更多
文摘Objective: To study the relationship between the polymorphism of drug resistant gene rpoB and drug resistance against rifampicin(RFP) of M. tuberculosis L-forms, and to evaluate its clinical application. Methods: A total of 52 clinical isolated strains of M. tuberculosis L-forms were collected. rpoB gene polymorphism was analyzed by polymerase chain reaction and single-strand conformation polymorphism (PCR-SSCP) and conventional antimicrobial susceptibility test (AST). Their results were compared. Results: AST results showed that 38 of 52 clinical isolated strains were drug resistance (73.08％),while PCR-SSCP indicated 65.38％ (32/52) rpoB gene polymorphism. There was no statistic significance(χ2= 2.4914) between the 2 methods. Conclusion:Combined the application of PCR-SSCP with AST in detecting rpoB drug resistant gene polymorphism of M. tuberculosis L-form from pneumoconiosis patients with tuberculosis may have advantages at earlier diagnosis and guidance of clinical medications.
文摘目的研究原发性肝癌拓扑异构酶Ⅱα(Topoisom eraseⅡ,αToPoⅡα)的表达及临床意义,并探讨其与p53基因突变之间的关系。方法免疫组织化学法和W estern B lotting方法检测57例未经化疗过的原发性肝癌肿瘤组织和32例肝硬化组织ToPoⅡα蛋白的表达,并用聚合酶链反应-单链构象多态性(PCR-SSCP)分析p53基因7、8外显子的突变。结果To-PoⅡα蛋白在肝癌组织中阳性率为87.7%(50/57),在肝硬化组织中阳性率为50%(16/32),两者有显著差异(P<0.05)。蛋白印迹结果显示肝癌组织中ToPoⅡα蛋白表达显著高于肝硬化组织(P<0.05),高分化肿瘤与中、低分化的肿瘤组织之间有显著差异(P<0.05),有转移的病人高于无转移者(P<0.05).等级相关分析显示ToPoⅡα蛋白的表达与p53基因突变呈正相关(r=0.914,P=0.001)。p53基因突变组ToPoⅡ蛋白的表达显著高于野生型组(P<0.01)。结论ToPoⅡα的检测可作为肝癌分化程度的特异指标,同时p53基因突变可能诱导ToPoⅡα蛋白的表达。
基金Supported by Developmental Programming Item of National Keystone Basic Research (G2000016106) and National Natural Science Foundation of China (No. 39600079)
文摘Objective：To study the genetic variation of mitochondrial DNA （mtDNA） among common laboratory strains of inbred mice. Methods： The genetic polymorphism of mtDNA among 4 classical laboratory strains of inbred mice and 3 inbred strains of mice established in China was analyzed by polymerase chain reaction coupled with restriction fragment length polymorphism（PCR-RFLP） and PCR coupled with single-stranded conformation polymorphism（PCR-SSCP）. Results： With regard to the D-loop （Displacement loop, D-loop）, tRNA^ Met＋Glu＋Ile, and ND3 （NADH dehydrogenase subunit 3, ND3） gene fragments of mtDNA from these mice,no variation was revealed by PCR-RFLP at 46 restriction enzyme sites. Further analyzed by PCR-SSCP,the D-loop 5＇fragment and 3＇end fragment of mtDNA from these mice also showed no genetic variation. Conclusion： Owing to maternal mode of inheritance of mtDNA,the results indicate that these common inbred strains of mice share the same maternal lineage.
