We isolated 4 Norwalk-like viruses （NLVs） contaminated oysters from 33 Chinese oysters collected from local commercial sources of Shandong Province. After amplification of the RNA-dependent RNA polymerase （RdRp） r...We isolated 4 Norwalk-like viruses （NLVs） contaminated oysters from 33 Chinese oysters collected from local commercial sources of Shandong Province. After amplification of the RNA-dependent RNA polymerase （RdRp） region of NLVs genomes with RT-PCR, the open reading frame 1 （ORF 1） of the RdRp was sequenced and subjected to multiple-sequence alignment. The results showed that NLVs in the four isolates belong to genogroup Ⅱ. The sequence comparison showed that the similarity between four Chinese oyster isolates were higher than 99.0%, which indicated that NLVs prevalent in close areas have high homogeneity in genome sequences. In addition, the most conserved sequences between diverse NLVs were used to design primers and TaqMan probes, then the real-time quantitative PCR assay was performed. According to the standard curve of GII NLVs, the original amounts （copies） of NLVs in positive patient＇s fecal isolate, positive Japanese oyster isolate, and the Chinese oyster isolate were 8.9× 10^8, 1.25× 10^8 and 4.7× 10^1 respectively. The detecting limit of NLVs was 1 × 10^1 copies. This study will be helpful for routine diagnosis of NLVs pathogens in foods and thus for avoiding food poisoning in the future.展开更多
目的探讨定量检测人端粒酶逆转录酶(hTERT)mRNA在乳腺癌鉴别诊断中的价值,并观察原癌基因c-Myc与hTERT mRNA表达的关系。方法收集癌旁正常乳腺组织、乳腺普通型导管增生、不典型导管增生、导管原位癌、浸润性导管癌病例,采用实时荧光定...目的探讨定量检测人端粒酶逆转录酶(hTERT)mRNA在乳腺癌鉴别诊断中的价值,并观察原癌基因c-Myc与hTERT mRNA表达的关系。方法收集癌旁正常乳腺组织、乳腺普通型导管增生、不典型导管增生、导管原位癌、浸润性导管癌病例,采用实时荧光定量RT-PCR技术(Real-ti me RT-PCR)定量检测hTERT和c-Myc基因的转录水平。结果以NhTERT=10为临界值,所有正常组织和良性病变NhTERT值均小于临界值,而hTERT基因转录升高的导管原位癌及浸润性导管癌其NhTERT值均大于此临界值。显示hTERT和c-Myc基因转录水平呈正相关(γ=0.7395,P<0.01)。结论实时荧光定量PCR技术检测hTERT基因表达具有高敏感性和特异性,能为常规病理学诊断提供客观的参考指标,从而提高乳腺不典型导管增生与导管原位癌鉴别诊断的准确性。原癌基因c-Myc转录水平上调可能与乳腺癌hTERT基因转录激活有关。展开更多
目的建立实时荧光定量反转录聚合酶链反应(reverse transcription po lym erase cha in reaction,RT-PCR)法检测TNF-α基因mRNA表达。方法用T-A克隆技术构建含TNF基因的载体作为标准模板,采用荧光T aqm an方法及探针标记技术,建立实时...目的建立实时荧光定量反转录聚合酶链反应(reverse transcription po lym erase cha in reaction,RT-PCR)法检测TNF-α基因mRNA表达。方法用T-A克隆技术构建含TNF基因的载体作为标准模板,采用荧光T aqm an方法及探针标记技术,建立实时荧光定量RT-PCR方法,制备标准曲线,检测肿瘤患者与正常人外周血单个核细胞的TNF-αmRNA表达水平变化,并与半定量RT-PCR检测结果进行比较。结果实时荧光定量RT-PCR检测肿瘤患者外周血单个核细胞TNF-αmRNA表达明显高于正常人,且半定量RT-PCR结果显示TNF-α出现类似的变化趋势。结论所建立的实时荧光定量RT-PCR用于检测TNF-αmRNA表达,结果用拷贝数表示,比半定量RT-PCR更灵敏、准确。展开更多
文摘We isolated 4 Norwalk-like viruses （NLVs） contaminated oysters from 33 Chinese oysters collected from local commercial sources of Shandong Province. After amplification of the RNA-dependent RNA polymerase （RdRp） region of NLVs genomes with RT-PCR, the open reading frame 1 （ORF 1） of the RdRp was sequenced and subjected to multiple-sequence alignment. The results showed that NLVs in the four isolates belong to genogroup Ⅱ. The sequence comparison showed that the similarity between four Chinese oyster isolates were higher than 99.0%, which indicated that NLVs prevalent in close areas have high homogeneity in genome sequences. In addition, the most conserved sequences between diverse NLVs were used to design primers and TaqMan probes, then the real-time quantitative PCR assay was performed. According to the standard curve of GII NLVs, the original amounts （copies） of NLVs in positive patient＇s fecal isolate, positive Japanese oyster isolate, and the Chinese oyster isolate were 8.9× 10^8, 1.25× 10^8 and 4.7× 10^1 respectively. The detecting limit of NLVs was 1 × 10^1 copies. This study will be helpful for routine diagnosis of NLVs pathogens in foods and thus for avoiding food poisoning in the future.
文摘目的探讨定量检测人端粒酶逆转录酶(hTERT)mRNA在乳腺癌鉴别诊断中的价值,并观察原癌基因c-Myc与hTERT mRNA表达的关系。方法收集癌旁正常乳腺组织、乳腺普通型导管增生、不典型导管增生、导管原位癌、浸润性导管癌病例,采用实时荧光定量RT-PCR技术(Real-ti me RT-PCR)定量检测hTERT和c-Myc基因的转录水平。结果以NhTERT=10为临界值,所有正常组织和良性病变NhTERT值均小于临界值,而hTERT基因转录升高的导管原位癌及浸润性导管癌其NhTERT值均大于此临界值。显示hTERT和c-Myc基因转录水平呈正相关(γ=0.7395,P<0.01)。结论实时荧光定量PCR技术检测hTERT基因表达具有高敏感性和特异性,能为常规病理学诊断提供客观的参考指标,从而提高乳腺不典型导管增生与导管原位癌鉴别诊断的准确性。原癌基因c-Myc转录水平上调可能与乳腺癌hTERT基因转录激活有关。
文摘目的建立实时荧光定量反转录聚合酶链反应(reverse transcription po lym erase cha in reaction,RT-PCR)法检测TNF-α基因mRNA表达。方法用T-A克隆技术构建含TNF基因的载体作为标准模板,采用荧光T aqm an方法及探针标记技术,建立实时荧光定量RT-PCR方法,制备标准曲线,检测肿瘤患者与正常人外周血单个核细胞的TNF-αmRNA表达水平变化,并与半定量RT-PCR检测结果进行比较。结果实时荧光定量RT-PCR检测肿瘤患者外周血单个核细胞TNF-αmRNA表达明显高于正常人,且半定量RT-PCR结果显示TNF-α出现类似的变化趋势。结论所建立的实时荧光定量RT-PCR用于检测TNF-αmRNA表达,结果用拷贝数表示,比半定量RT-PCR更灵敏、准确。
