Background: Pyrazinamide (PZA) is one of the most important drugs for tuberculosis (TB) treatment, however, its susceptibility is not routinely tested. High-resolution melting (HRM) curve analysis has been widely used...Background: Pyrazinamide (PZA) is one of the most important drugs for tuberculosis (TB) treatment, however, its susceptibility is not routinely tested. High-resolution melting (HRM) curve analysis has been widely used for many applications. In this study, HRM assay was developed and evaluated for the detection of PZA resistance in Mycobacterium tuberculosis clinical isolates. Methods: Ninety five M. tuberculosis clinical isolates with different susceptibility patterns to anti-TB drugs were used to evaluate this assay. Isolates were phenotypically (Bactec MGIT 960) and genotypically (HRM and pncA gene sequencing) analysed for PZA resistance. Results: Bactec MGIT 960 analysis revealed that 29 of the 95 M. tuberculosis isolates were PZA resistant. In comparison to the Bactec MGIT 960, HRM showed a sensitivity of 47.7% and specificity of 74.6%, and the overall agreement between the two methods was 68.4%. Based on DNA sequencing, a correlation of 0.67 (significant at p-value pncA mutations was observed. PZA resistance was strongly associated with multi-drug resistant (MDR)-TB as it was shown in 79.3% of the MDR isolates included in the study. Conclusion: HRM is simple and useful for screening clinical M. tuberculosis isolates for PZA resistance, however, further modifications to improve its performance are required.展开更多
目的采用高分辨融解曲线(HRM)技术建立检测类ADP核糖基化因子GTP酶15(ARL15)、主要组织相容性抗原复合体ⅡDMα(HLA-DMA)和核因子κB亚基2(NFKB2)基因单核苷酸多态性(SNP)的方法,并探讨其与中国西北地区汉族人群类风湿性关节炎(RA)易感...目的采用高分辨融解曲线(HRM)技术建立检测类ADP核糖基化因子GTP酶15(ARL15)、主要组织相容性抗原复合体ⅡDMα(HLA-DMA)和核因子κB亚基2(NFKB2)基因单核苷酸多态性(SNP)的方法,并探讨其与中国西北地区汉族人群类风湿性关节炎(RA)易感性的关系。方法针对rs255758、rs1063478、rs397514331和rs397514332四个SNP位点建立PCRHRM检测体系并测序验证。对588例RA患者和200例健康对照标本进行病例对照研究,分析这四个SNP与RA发病风险的关系。结果建立的针对四个SNP位点的PCR-HRM基因分型方法经测序验证可正确分型。rs397514331和rs397514332位点未发现突变基因型。rs255758和rs1063478位点的基因型频率在两组间存在统计学差异,而基因频率无统计学差异。其中rs255758位点的AA基因型在显性模型(AA vs AC/CC)下降低RA发病风险(OR=0.666,95%CI=0.478~0.927,P=0.016)。结论我们建立的PCR-HRM基因分型方法可对rs255758、rs1063478、rs397514331和rs397514332四个SNP位点进行常规化检测。ARL15和HLA-DMA基因多态性与中国西北地区汉族人群RA易感相关。展开更多
目的建立甲基化特异高分辨率溶解曲线(Methylation sensitive high resolution melting curve,MS-HRM)定量检测胶质瘤MGMT基因启动子甲基化的方法,用于指导胶质瘤患者术后化疗及预后判断。方法从标本库随机选取胶质瘤组织37例,提取DNA...目的建立甲基化特异高分辨率溶解曲线(Methylation sensitive high resolution melting curve,MS-HRM)定量检测胶质瘤MGMT基因启动子甲基化的方法,用于指导胶质瘤患者术后化疗及预后判断。方法从标本库随机选取胶质瘤组织37例,提取DNA进行甲基化修饰,应用MS-HRM方法和甲基化特异性PCR(methylation specific PCR,MSP)进行MGMT基因启动子区甲基化检测。结果 MSP方法检测显示部分甲基化标本29例(78.4%),较甲基化(13.5%)和未甲基化(8.1%)差异显著。MS-HRM发现MGMT基因启动子甲基化水平在10%~25%和25%~50%的标本分别有14例(37.8%)和17例(49.5%)。结论成功建立MS-HRM检测胶质瘤MGMT启动子甲基化的方法,该方法特异性高、灵敏度强和可重复性,有望应用于临床胶质瘤MGMT启动子甲基化高通量定量检测,以指导个体化治疗。展开更多
文摘Background: Pyrazinamide (PZA) is one of the most important drugs for tuberculosis (TB) treatment, however, its susceptibility is not routinely tested. High-resolution melting (HRM) curve analysis has been widely used for many applications. In this study, HRM assay was developed and evaluated for the detection of PZA resistance in Mycobacterium tuberculosis clinical isolates. Methods: Ninety five M. tuberculosis clinical isolates with different susceptibility patterns to anti-TB drugs were used to evaluate this assay. Isolates were phenotypically (Bactec MGIT 960) and genotypically (HRM and pncA gene sequencing) analysed for PZA resistance. Results: Bactec MGIT 960 analysis revealed that 29 of the 95 M. tuberculosis isolates were PZA resistant. In comparison to the Bactec MGIT 960, HRM showed a sensitivity of 47.7% and specificity of 74.6%, and the overall agreement between the two methods was 68.4%. Based on DNA sequencing, a correlation of 0.67 (significant at p-value pncA mutations was observed. PZA resistance was strongly associated with multi-drug resistant (MDR)-TB as it was shown in 79.3% of the MDR isolates included in the study. Conclusion: HRM is simple and useful for screening clinical M. tuberculosis isolates for PZA resistance, however, further modifications to improve its performance are required.
文摘目的采用高分辨融解曲线(HRM)技术建立检测类ADP核糖基化因子GTP酶15(ARL15)、主要组织相容性抗原复合体ⅡDMα(HLA-DMA)和核因子κB亚基2(NFKB2)基因单核苷酸多态性(SNP)的方法,并探讨其与中国西北地区汉族人群类风湿性关节炎(RA)易感性的关系。方法针对rs255758、rs1063478、rs397514331和rs397514332四个SNP位点建立PCRHRM检测体系并测序验证。对588例RA患者和200例健康对照标本进行病例对照研究,分析这四个SNP与RA发病风险的关系。结果建立的针对四个SNP位点的PCR-HRM基因分型方法经测序验证可正确分型。rs397514331和rs397514332位点未发现突变基因型。rs255758和rs1063478位点的基因型频率在两组间存在统计学差异,而基因频率无统计学差异。其中rs255758位点的AA基因型在显性模型(AA vs AC/CC)下降低RA发病风险(OR=0.666,95%CI=0.478~0.927,P=0.016)。结论我们建立的PCR-HRM基因分型方法可对rs255758、rs1063478、rs397514331和rs397514332四个SNP位点进行常规化检测。ARL15和HLA-DMA基因多态性与中国西北地区汉族人群RA易感相关。
文摘目的建立甲基化特异高分辨率溶解曲线(Methylation sensitive high resolution melting curve,MS-HRM)定量检测胶质瘤MGMT基因启动子甲基化的方法,用于指导胶质瘤患者术后化疗及预后判断。方法从标本库随机选取胶质瘤组织37例,提取DNA进行甲基化修饰,应用MS-HRM方法和甲基化特异性PCR(methylation specific PCR,MSP)进行MGMT基因启动子区甲基化检测。结果 MSP方法检测显示部分甲基化标本29例(78.4%),较甲基化(13.5%)和未甲基化(8.1%)差异显著。MS-HRM发现MGMT基因启动子甲基化水平在10%~25%和25%~50%的标本分别有14例(37.8%)和17例(49.5%)。结论成功建立MS-HRM检测胶质瘤MGMT启动子甲基化的方法,该方法特异性高、灵敏度强和可重复性,有望应用于临床胶质瘤MGMT启动子甲基化高通量定量检测,以指导个体化治疗。
