共查询到17条相似文献,搜索用时 65 毫秒
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为了解市场上KRAS基因突变检测试剂盒的质量,指导试剂盒的选择和使用,选择了常见的3种试剂盒(随机编号A、B和C)对其进行质量评价。使用标准物质分别对试剂盒的准确度、特异性、检出限和重复性指标进行了评价。评价结果分别为:3种试剂盒的准确度均较好,对7个突变型的阳性符合率验证结果均为100%;3家实验室的特异性验证结果中,每种试剂盒都有假阳性结果检出,3种试剂盒中均不能满足7个突变型的阴性符合率为100%,阴性符合率为100%的突变型结果中,试剂盒A有6个,试剂盒B有6个,试剂盒C有3个;检出限评价结果表明,3种试剂盒对7个突变型的实际检出限与所标识的检出限(1%)不完全一致,其中3家实验室验证一致且与标识检出限相符的突变型,试剂盒A有0个,试剂盒B有3个,试剂盒C有5个;试剂盒的低水平重复性均较好(<5%)。 相似文献
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PIK3CA突变检测是实现肿瘤个体化治疗的重要预测因子。以PIK3CA为目的基因,选择E542K、E545K、H1047R三个热点突变,建立对其准确定量检测的微滴式数字聚合酶链式反应(ddPCR)方法。优化退火温度、引物探针浓度等条件,对方法特异性、线性范围、重复性等方面进行考察。结果表明,建立的ddPCR检测方法精密度好,在突变丰度(0.05~82.75)%范围内相对标准偏差值介于(0.392~14.031)%,准确性高,与重量法的相关系数达到99.91%、99.98%、99.94%;在突变丰度0.2%以上,方法的重复性可达5%以内;在突变丰度0.2%以下,重复性保持在15%以下。在20μL反应体系中3个热点突变的空白限分别为0.03%、 0.04%、0.04%,检测下限和定量下限均为0.05%。因此,所建立的PIK3CA基因E542K、E545K及H1047R位点突变的ddPCR参考测量灵敏度高,重复性好,在癌症诊断、个体化用药指导和预后方面具有良好的应用。 相似文献
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2019冠状病毒病(COVID-19)疫情已成为国际关注的突发公共卫生事件。为应对突发病毒疫情事件,加快病毒检测并提高检测准确性变得非常重要。中华人民共和国国家卫生健康委员会《新型冠状病毒肺炎诊疗方案》规定了核酸检测和基因测序作为确诊病例的方法,检测结果是对潜伏期人群、疑似病例人群和隔离期人群的新型冠状病毒(2019-nCoV/SARS-CoV-2)进行确诊的重要依据。对实时荧光RT-PCR检测、数字PCR检测及基因测序方法进行了综述,并对后续监控和生物安全测量(生物计量)标准体系的建立进行了展望。 相似文献
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实时荧光定量PCR仪是当前临床核酸检测、分子诊断以及生命科学研究的关键设备,目前广泛应用于生物学及医学研究的各个领域。通过对实时荧光PCR检测系统的新结构革新,采用底部快速扫描技术及先进的半导体制冷器控制的升降温系统,使实时荧光PCR检测系统性能得到飞跃,达到国际先进的水平。 相似文献
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Junjie Zhu Yanfeng Zhao Ming Liu Diego Gonzalez‐Rivas Xinnan Xu Weijing Cai Huiwei Qi Lei Dai Zijian Wang Xiao Song Gening Jiang Yang Yang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(9)
An accurate genotyping analysis is one of the critical prerequisites for lung cancer targeted therapy. Here, a quantitative polymerase chain reaction (qPCR)‐based mutation detection system, mutation‐selected amplification‐specific system PCR (MASS‐PCR), is developed. The specific primers and probes used in MASS‐PCR exactly match with the mutant sequence that only allows mutant gene to emit the fluorescence peak. To determine the sensitivity of MASS‐PCR, 717 lung cancer specimens, 61 formalin‐fixed paraffin‐embedded (FFPE) tissues, and 656 fresh reaction tissues are collected and undergo mutation detection of lung cancer driver genes (EGFR, KRAS, BRAF, HER2, MET, ALK, and ROS1). These samples are divided into two groups. Mutations in Group I, which has 631 fresh reaction tissues, are analyzed by MASS‐PCR and the amplification refractory mutation system PCR (ARMS‐PCR). While group II samples, 25 fresh reaction tissues and 61 FFPE tissues, are screened through MASS‐PCR and next‐generation sequencing (NGS). All results are verified by direct sequencing. MASS‐PCR shows high consistency with ARMS‐PCR (kappa value > 0.733) and NGS (kappa value = 0.79) (P < 0.001). For the samples with inconsistent MASS‐PCR and ARMS‐PCR results, DS results more likely support the MASS‐PCR results. These data suggest that MASS‐PCR is a convenient, accurate, and economical method for the detection of lung cancer driver gene mutations in clinical practice. 相似文献
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Okju Kim Daewon Lee Amos Chungwon Lee Yongju Lee Hyung Jong Bae Han‐Byoel Lee Ryong Nam Kim Wonshik Han Sunghoon Kwon 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(37)
Single cell analysis of heterogeneous circulating tumor cells (CTCs), by which the genomic profiles of rare single CTCs are connected to the clinical status of cancer patients, is crucial for understanding cancer metastasis and the clinical impact on patients. However, the heterogeneity in genotypes and phenotypes and rarity of CTCs have limited extensive single CTC genome research, further hindering clinical investigation. Despite recent efforts to build platforms that separate CTCs, the investigation on CTCs is difficult due to the lack of a retrieval process at the single cell level. In this study, laser‐induced isolation of microstructures on an optomechanically‐transferrable‐chip and sequencing (LIMO‐seq) is applied for whole genome sequencing of single CTCs. Also, the whole genome sequences and the molecular profiles of the isolated single cells from the whole blood of a breast cancer patient are analyzed. 相似文献
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PCR及其改进技术在食品安全检测中的应用研究 总被引:1,自引:0,他引:1
介绍PCR及其改进技术在食品安全检查中的应用,分析了各种PCR技术的优缺点以及在未来食品安全检测应用中的发展趋势。 相似文献
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针对数字信号发生器检定装置和信号分析仪期间核查缺乏产生EVM值可控的数字信号标准装置的情况,在理论推导加性高斯白噪声环境下的EVM与SNR之间的解析关系基础上,提出了基于噪声发生器和数字信号发生器的EVM值可设置的数字调制信号产生系统方案。对系统输出的BPSK信号和64QAM信号展开重复性和稳定性测试,测试结果表明,尽管理论设置值与实际值之间存在一定的差距,但并不影响任意EVM值数字调制信号产生系统的稳定输出,其重复性和稳定完全可满足数字信号发生器校准装置或者矢量信号分析仪的期间核查的需要。 相似文献