TaqmanqPCR检测CD147／Basigin剪接变异体在人上皮性卵巢癌中的表达

目的：应用TaqmanqPCR技术检测CDl47／basigin剪接变异体在人上皮性卵巢癌组织与正常卵巢组织中的表达差异。方法：运用半定量RT．PCR技术检测CDl47／basigin剪接变异体在上皮性卵巢癌细胞系中的表达;TaqmanqPCR检测CDl47／basigin剪接变异体在人上皮性卵巢癌细胞系中的表达分布;进一步通过收集32例上皮性卵巢癌组织与26例正常卵巢组织,提取组织RNA,反转录cDNA,TaqmanqPCR检测CDl47／basigin剪接变异体mRNA在上皮性卵巢癌组织与正常卵巢组织中的表达差异。结果：半定量RT-PCR结果显示basigin-2,basigin-3和basigin-4在上皮性卵巢癌细胞系中均有表达,主要以basigin-2为主;TaqmanqPCR检测到三种剪接变异体在不同卵巢癌细胞系中表达不同,basigin-2在卵巢癌细胞系中较basigin一3,basigin-4表达较高,basigin一4较basigin．3略高;Basigin．2剪接变异体在高转移Ho．8910pm细胞中表达较高,在低转移HO一8910细胞中表达较低。组织TaqmanqPCR检测basigin-2和basigin-4在上皮性卵巢癌组织中的表达水平显著高于正常卵巢组织（P值分别为〈0．0001和0．0261）,basigin．3的表达水平略有升高（P=0．2616）,但无统计学意义。结论：三种剪接变异体在卵巢癌组织中较正常卵巢组织表达上调。CDl47／basigin．2在高转移卵巢癌细胞系HO-8910pm中高表达,在低转移卵巢癌细胞系HO-8910中低表达,且表达强度与上皮性卵巢癌的转移相关;探讨CDl47／basigin一2在上皮性卵巢癌中的高表达,为卵巢癌的进一步治疗开辟一新途径。     

Design of a 5' exonuclease-based real-time PCR assay for simultaneous detection of Bacillus licheniformis, members of the 'B. cereus group' and B. fumarioli in gelatine

AIMS: The design of a fast, sensitive and specific detection method for Bacillus licheniformis, members of the 'B. cereus group' and B. fumarioli in gelatine. METHODS AND RESULTS: Specific Taqman probes were designed and tested in a real-time PCR setting. A specific fluorescent signal could be obtained for all gelatine isolates attributed to these species in one single real-time PCR reaction. After sample preparation, a gelatine sample spiked with 1 CFU provided enough template DNA for a significant signal. CONCLUSION: The potential of a real-time PCR assay for simultaneous detection of B. licheniformis, members of the 'B. cereus group' and B. fumarioli in gelatine is demonstrated. SIGNIFICANCE AND IMPACT OF THE STUDY: Implementation of the assay in gelatine producing plants may shorten delivery terms and inform on hazards to public health and suitable remediation procedures.     

Early molecular-level changes in rat bladder wall tissue following spinal cord injury

Previously, we demonstrated using a rat model of spinal cord injury (SCI) that bladder wall tissue compliance significantly increased within the first 2 weeks following injury. In order to explore the potential molecular-level mechanisms of this event, the present study quantified molecules pertinent to bladder tissue remodeling and changes in mechanical properties. An initial gene array analysis followed by real-time qPCR revealed that the message levels for tropoelastin and lysyl oxidase were as high as 8-fold in SCI rats compared to normal. Furthermore, both the message and protein levels of TGF-beta1 and IGF-1, known stimulators of elastin synthesis, in SCI rat bladders were significantly higher compared to those of normal rats. Taken together, it can be speculated that functional changes of the bladder associated with SCI induce release of select growth factors, which, in turn, stimulate elastogenesis that lead to alteration of biomechanical properties of the wall tissue.     

Detection of Mycobacterium immunogenum by real-time quantitative Taqman PCR

A quantitative real-time 5′-nuclease (Taqman) PCR technique was developed to specifically detect Mycobacterium immunogenum. rpoB-specific primers and Taqman probe were evaluated for detection of M. immunogenum DNA extracted from pure cultures and from industrial metal working fluids (MWFs). Specificity was confirmed and the sensitivity of detection of M. immunogenum genomic DNA was shown to be approximately 9 fg (2 cell equivalents). When tested on industrial metal working fluids from the UK and USA from which no M. immunogenum CFU were recovered, the assay detected between 3.4 × 10¹ and 1.9 × 10⁴ cell equivalents (CE) per ml, and increased the detection rate over culture to 37.5% (12 of 32 samples). This assay provides a specific, sensitive and rapid method for the detection of M. immunogenum and is applicable within industry for the early detection of this human pathogen and to the possible prevention of hypersensitivity pneumonitis (HP) in workers.     

Evaluation of the Applied Biosystems automated Taqman polymerase chain reaction system for the detection of meningococcal DNA

In a period where the proportion of culture confirmed cases in the UK has been steadily declining, diagnosis by PCR has been used to increase the number of confirmed cases and provide additional epidemiological data. This report presents a comparative evaluation of the fluorogenic probe-based 5' exonuclease assay (Taqman) using the Perkin-Elmer Applied Biosystems automated sequence detection system 7700 with previously reported polymerase chain reaction enzyme-linked immunosorbent (PCR ELISA) assays for the detection of meningococcal DNA in CSF, plasma and serum samples. Taqman assays developed were based on the detection of a meningococcal capsular transfer gene (ctrA), the insertion sequence IS1106 and the sialytransferase gene (siaD) for serogroup B and C determination and compared with similar assays in a PCR ELISA format. The Taqman ctrA assay was specific for Neisseria meningitidis, however the IS1106 assay gave false positive reactions with a number of non-meningococcal isolates. Sensitivity of the Taqman ctrA, IS1106 and siaD assays testing samples from culture-confirmed cases were 64, 69 and 50%, respectively, compared with 26, 67 and 43% for the corresponding PCR ELISA assays. Improvements to the DNA extraction procedure has increased the sensitivity to 93 and 91% for the TaqMan ctrA and siaD assays, respectively, compared to culture confirmed cases. Since the introduction of Taqman PCR a 56% increase in laboratory confirmed cases of meningococcal disease has been observed compared to culture only confirmed cases. The developed Taqman assays for the diagnosis of meningococcal disease enables a high throughput, rapid turnaround of samples with considerable reduced risk of contamination.     

实时定量RT-PCR检测鱼类传染性造血器官坏死病毒方法的建立与应用

建立了Taqman 实时定量RT-PCR方法检测传染性造血器官坏死病毒(IHNV).选取IHNV病毒的N蛋白基因保守序列,利用Primer Express 2.0软件设计引物和探针.以梯度稀释的含有IHNV目的扩增片段的质粒作为标准品,进行定量RT-PCR反应以确定检测灵敏度.病毒浓度在5×106 -5个拷贝,共7个数量级的范围内,定量RT-PCR反应有"S"型扩增曲线,检测灵敏度为5个拷贝.根据病毒拷贝数与定量反应Ct值的关系,绘制了标准曲线.该方法具有特异性,对鲤春血症病毒(SVCV)、病毒性出血性败血症(VHSV)、传染性胰脏坏死病毒(IPNV)、草鱼呼肠孤病毒(GCRV)、流行性造血器官坏死病毒(EHNV)、EPC细胞系、牙鲆的核酸都没有扩增反应.在50批待检样品中,有3批鱼类感染IHNV,利用标准曲线进行了定量分析.实时定量RT-PCR检测IHNV方法,灵敏度高,特异性好,可以进行定量分析,在鱼病的快速检测上具有重要意义.     

Taqman定量PCR技术检测基因编辑番茄中外源基因拷贝数体系的建立

近些年CRISPR/Cas9基因编辑技术已广泛应用于作物遗传育种中,经过拷贝数筛选得到的单拷贝基因编辑株系,可以进行遗传分离获得具有改良性状但不携带外源基因成分的非转基因植株,消除转基因安全性的风险。目前拷贝数的检测主要采用Southern杂交,但是该方法存在操作复杂,需要相对大量的植物材料等缺点,不能进行高通量的筛选。为建立简便高效的基因编辑番茄植株中外源基因拷贝数的检测体系,以内源性基因APX(抗坏血酸过氧化物酶基因)作为内参基因,外源性基因HPT(潮霉素磷酸转移酶基因)作为目的基因,利用Taqman法的实时荧光定量PCR技术,检测有12株PDS基因(八氢番茄红素脱氢酶基因)编辑番茄中外源抗性基因HPT的拷贝数为1,初步建立了一种检测基因编辑植株中外源基因整合拷贝数的方法,为快速可靠的筛选单拷贝改良株系奠定了一定的技术基础。