共查询到17条相似文献，搜索用时 593 毫秒
1.
重组人血清白蛋白（HSA, Human serum albumin）基因工程水稻是我国自主研发的可规模化生产水稻重组人血清白蛋白（OsrHSA）的转基因品系，具有极高的推广价值和应用前景，但是目前缺乏对其进行精准定量检测的方法。微滴数字PCR（ddPCR, droplet digital PCR）是近年来新兴的前沿PCR技术，不依赖标准物质即可实现对DNA分子的绝对定量，在转基因产品定量领域被广泛应用。本研究基于ddPCR平台建立了适用于重组人血清白蛋白基因工程水稻（114-7-2品系）的二重ddPCR精准定量检测方法。通过对引物探针的特异性进行验证、对引物探针工作浓度和反应退火温度进行优化，获得最佳反应条件。进而对该方法检测限、定量限和结果重复性做了测定。最后通过对不同含量的重组人血清白蛋白转基因水稻样品进行定量检测，分析比较传统实时荧光定量PCR（quantitative real-time PCR, qRT-PCR）和二重ddPCR的优劣，结果表明本研究建立的转基因水稻HSA/PLD二重ddPCR方法稳定性更好、灵敏度高、成本低廉，精准可靠，适用于不依赖标准物质的精准定量HSA转基因水稻转化体含量分析，可取代qRT-PCR方法进行HSA转基因水稻的绝对定量检测，完善了我国转基因水稻成分精确定量检测技术体系。 相似文献
2.
抗虫玉米MON89034转化体特异性PCR检测技术研究 总被引：5，自引：2，他引：3
根据抗虫玉米MON89034外源插入片段5’端与植物基因组连接区序列设计特异性引物,并进行PCR扩增,预期产物大小为455 bp。以zSSIIb基因作为内标准基因,建立了转基因玉米MON89034转化体特异性定性PCR检测方法。对该方法进行重现性、特异性和灵敏度测试,结果表明:该方法能够特异性检测出MON89034转化体,以100 ngDNA为模板,该方法的检测灵敏度达到0.1%,约为40个起始模板拷贝。复合PCR检测结果还表明,在同一PCR反应管中可实现对zSSIIb基因和MON89034的同时检测。 相似文献
3.
为了对基因组编辑产品进行精准定性和定量检测，以水稻SP1 基因的编辑植株为材料，在编辑位点上下
游设计通用引物，在编辑位点处设计基因编辑位点特异性TaqMan探针，建立了编辑位点特异性PCR方法。利用该
方法可准确鉴定特异基因组编辑产品，检测灵敏度达到5~10拷贝，可在实时荧光PCR（qPCR）和微滴数字PCR
（ddPCR）平台上对基因组编辑产品进行定量检测。由于数字PCR的微反应单元可消除野生型DNA对通用引物的
竞争性消耗，与qPCR的定量结果相比，ddPCR定量结果具有更高的定量准确性。 相似文献
4.
应用单管巢式和半巢式PCR检测转基因玉米MON89034 总被引：1，自引：1，他引：0
根据MON89034玉米的5’端和3’端边界序列分别设计1组转化体特异性的巢式PCR引物,采用中途进退式PCR策略建立MON89034玉米的转化体特异性检测方法,扩增产物分别为491 bp和188 bp。以转基因玉米MON89034及8种其他转基因作物为材料,证明此方法对MON89034玉米具有高度特异性。灵敏度测试结果表明,此方法的相对检出限达到0.01%,绝对检出限为4个单倍体基因组拷贝数,比普通PCR提高了5倍。建立的单管巢式和半巢式PCR方法可准确、高效地检测转基因玉米MON89034及其产品。 相似文献
5.
转基因玉米MON810(Yield Gard R)是孟山都公司通过DNA重组技术和微注射轰击研发的一种具有对欧洲玉米螟(ECB;Ostrinia nublialis)有特殊抗性的转基因玉米品系,目前在世界各地已经得到广泛种植,为加强对该品系玉米的安全管理,本研究旨在建立MON810品系玉米的转化事件特异性定性PCR检测方法。根据MON810的插入序列信息,在3′端的侧翼序列处设计定性PCR检测的引物,检测MON810在其他几种常见转基因作物混合样品的特异性。结果表明,该方法具有很好的特异性。同时检测该引物系统的扩增灵敏度,结果表明,检测引物的灵敏度可达0.1%。建立的MON810特异定性PCR检测方法经全国7家实验室的验证,进一步证实该方法能够特异地检测出样品中的MON810转化事件,检测方法的灵敏度可达0.1%,且检测结果具有良好的可重复性和可重现性。MON810转化事件定性PCR检测方法的建立可满足于抗虫转基因玉米MON810及其衍生品种生物安全管理的需要。 相似文献
6.
《大豆科学》2020,(2)
转基因大豆MON87701是由孟山都公司研发的商业化抗虫大豆品系,目前已在17个国家广泛应用。为建立适用于MON87701大豆的高效检测方法,本研究基于实时荧光定量PCR(real-time fluorescence quantitive PCR, qPCR)和芯片式数字PCR(3D digital PCR, 3D-dPCR)平台,对44种不同转基因材料进行测试,建立双重定量检测方法。研究结果显示:只在转基因大豆MON87701样品中获得了阳性结果,证实该方法中引物和探针组合具有较高的特异性。进一步对2%、0.9%、0.09%和0.02%不同含量的MON87701转基因大豆进行定量测试,建立的qPCR和3D-dPCR两种方法的定量限均达到0.09%,检出限均达到0.02%,两者并无明显差别,但由于3D-dPCR和qPCR相比不需要标准物质制作标准曲线,并且对DNA提取质量要求更低,因此使用起来更加便捷高效,为转基因检测提供了新的方法和思路。 相似文献
7.
应用多重荧光PCR快速筛查作物中转基因成分研究 总被引：1，自引：0，他引：1
通过对我国批准进口的和获得农业转基因生物安全证书的转基因玉米转化体的序列分析发现,除DAS40278-9和BLVA430101外,CaMV35s启动子、NOS终止子、Cry1Ab/Ac基因和pat基因覆盖了21种玉米转基因转化体。通过引物组合筛选、反应体系优化、灵敏度测试、适用性测试等实验,建立了基于4个通用筛选元件及zSSIIb内源基因的五重荧光PCR和基于转化体特异性序列的二重荧光PCR检测转基因成分方法体系。方法参数测定结果表明,此方法特异性强、稳定性好,检测灵敏度达到0.05%。同时,此方法体系不仅适用于转基因玉米成分筛查,对大豆、水稻等多种作物进行转基因成分筛选鉴定也有良好的适用性。 相似文献
8.
数字PCR对核酸分子进行定量检测时不依赖于标准曲线和标准物质,在转基因定量检测中可直接计算出模板中外源基因的拷贝数浓度值和转基因含量。本文概述了数字PCR在转基因定量检测中的应用,将数字PCR与实时荧光定量PCR的技术参数从检测特异性、线性动态范围、准确度、灵敏度、稳健性等方面进行了对比分析,以利其在转基因生物安全管理及转基因标识制度发挥技术支撑作用。本文还阐述了影响数字PCR检测结果的因素,探讨了数字PCR结果溯源至SI单位的可能性,为数字PCR在转基因定量检测以及其它领域核酸精确定量的应用提供参考。 相似文献
9.
以若干定性PCR方法部颁标准对含有0.5％的4份不同转基因混合样品进行检测,先以通用元件标准中的CaMV35s启动子、NOS终止子对混合样品进行初步定性PCR筛选。结果表明,4份样品中都含有转基因成分。Bt基因特异性标准检测表明,3#和4#样品含有转基因抗虫水稻成分。构建特异性标准PCR检测表明,2#、3#和4#样品含有转基因GTS-40-3-2大豆成分。以MON810、Bt176、NK603转化体事件标准进行品系特异性PCR检测,结果证实：1#和4#样品中含有Bt176转基因玉米成分;3#样品中含有Mon810转基因玉米成分;4份样品中均不含NK603转基因玉米成分。说明农业部颁布的定性PCR方法标准能满足于对多种转基因混合样品的检测,且检测结果准确,可靠。 相似文献
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11.
Genetically modified crops are widely grown in the world today. Labeling is required when genetically modified organisms (GMOs) are placed on the market. There is a need to establish a specific method for the detection of genetically modified foods. MON863 transgenic maize containing a Cry3Bb1 sequence that produces insecticidal protein cry3Bb1 is a major GMO crop. In this paper, we report studies that designed specific PCR primers and TaqMan probes based upon the 5′-transgene integration sequence, and developed qualitative and quantitative PCR conditions using these primers and probes. We determined the 5′-transgene integration sequence using a ligation-mediated polymerase chain reaction (LM PCR) method. In qualitative PCR studies, the limit of detection (LOD) was 0.5% for MON863 in 100 ng genomic DNA. In the quantitative PCR assays, the limit of detection (LOD) and limit of quantitation (LOQ) are 10 and 100 haploid copies, respectively. Maize samples with different contents of genetically modified component were tested using the established TaqMan real-time PCR system. 相似文献
12.
《中国油料作物学报(英文)》2022,7(4):180-188
The main advantage of digital PCR (dPCR) is that it facilitates absolute quantification of the target without reference to the standard/calibration curve. Crystal droplet dPCR has a three-color staining detection function, which enables multiplex PCR reaction. In this study, this technique was used to establish triple dPCR detection for the genetically modified soybean MON87708 × MON89788 with stacked traits. Specific absolute quantitative detection was accomplished for the genomic DNA extracted from the homogenized seeds of GM stack MON87708 × MON89788 soybean. Our results can serve as a reference for the absolute quantitative detection of stacked events of genetically modified crops. 相似文献
13.
《中国油料作物学报(英文)》2020,5(3):142-148
To develop a simple and fast method for screening genetically modified ingredients from processing by-product and waste, direct quantitative PCR (qPCR) kit-Taqman which omitting multi genomic DNA preparing steps was developed in this study. A total of 18 oil crop processing by-products and wastes including 10 soybean and 8 cotton materials were collected from food processing factories. Compared with 2 commercial direct qPCR kits, conditions of DNA releasing procedure and PCR amplification were optimized. Element screening was performed at the initial step of genetically modified (GM) ingredient testing procedure via direct qPCR. GM event identification was carried out in positive samples by initial screening. Totally 5 screening elements (P–35S, T-NOS, Cp4-epsps, bar and pat) for soybean materials and 6 screening elements (P–35S, T-NOS, NPTII, Cry1Ac, bar and pat) for cotton samples were detected. In GM event identification, MON531 and MON1445 were found in cotton materials. Results were further confirmed by real-time PCR with DNA extraction and purification. The direct qPCR system proposed by this research was convenient for rapid screening and identification of GM ingredients in oil crop primary by-product and waste. 相似文献
14.
《Journal of Cereal Science》2006,43(2):250-257
An event-specific detection method was developed based on the flanking sequence of an exogenous integrant in the transgenic maize MON863 which contains cry3Bb1 gene expressing a Bacillus thuringiensis Cry3Bb1 protein that is selectively toxic to a maize root worm pathogen. The 3′-integration junction between host plant DNA and integrated DNA of transgenic MON863 maize was isolated using thermal asymmetric interlaced (TAIL)-PCR. The event-specific primers and TaqMan probe were designed based upon the isolated 3′-integration junction sequence, and qualitative and quantitative PCR systems were established employing these designed primers and probe. In this system, the limit of detection of the qualitative PCR assay was estimated to be 40 initial haploid copies. The limit of quantitation of the quantitative PCR assay in authentic MON863 maize seeds was estimated to be approximately 80 haploid copies. GM MON863 contents were also quantified relative to endogenous maize starch synthase IIb (zSSIIb) gene DNA, and the results were expressed as the percentage of genetically modified MON863 maize DNA relative to the total content of maize DNA. All the results indicated that the established MON863 event-specific qualitative and quantitative PCR detection system based on the 3′-integration junction was reliable, sensitive and accurate. 相似文献
15.
《Journal of Cereal Science》2009,49(3):592-597
Genetically modified crops are widely grown in the world today. Labeling is required when genetically modified organisms (GMOs) are placed on the market. There is a need to establish a specific method for the detection of genetically modified foods. MON863 transgenic maize containing a Cry3Bb1 sequence that produces insecticidal protein cry3Bb1 is a major GMO crop. In this paper, we report studies that designed specific PCR primers and TaqMan probes based upon the 5′-transgene integration sequence, and developed qualitative and quantitative PCR conditions using these primers and probes. We determined the 5′-transgene integration sequence using a ligation-mediated polymerase chain reaction (LM PCR) method. In qualitative PCR studies, the limit of detection (LOD) was 0.5% for MON863 in 100 ng genomic DNA. In the quantitative PCR assays, the limit of detection (LOD) and limit of quantitation (LOQ) are 10 and 100 haploid copies, respectively. Maize samples with different contents of genetically modified component were tested using the established TaqMan real-time PCR system. 相似文献
16.
耐除草剂基因g10evo-epsps 在我国转基因农作物研发中常常被用作目标性状基因或筛选标记基因，因此
可作为转基因成分检测的重要筛查基因，但目前缺少相应的检测方法。本研究旨在建立g10evo-epsps 基因特异性
的实时荧光定量PCR（qPCR）检测方法，从而为转基因大豆的监测提供一种稳定可靠的方法体系。本研究基于转基
因大豆中的g10evo-epsps 基因序列设计了qPCR检测引物和探针，并对检测方法的特异性、灵敏度、准确度和精确性
进行了实验室内验证。结果显示，建立的g10evo-epspsqPCR检测方法能够特异性检测转基因大豆ZUTS-33中的
g10evo-epsps 目的基因；标准曲线分析表明，3次重复试验的扩增效率在90%以上，R2 均大于0.99；方法的检测限
（LOD）为不高于8拷贝，定量限（LOQ）推测为16拷贝；对含量为4.5%、2%、0.5%、0.09% 和0.045% 的转基因大豆
ZUTS-33基因组DNA进行准确度分析，发现该方法测定的平均值和预期值之间的偏差为0.00%~11.11%，3次重复
试验的RSDr为2.30%~17.10%。结果表明本研究建立的g10evo-epsps qPCR检测方法能够满足转基因大豆筛查检测
的要求，为转基因大豆监管和标识提供技术支撑。 相似文献
17.
转基因玉米特异性检测阳性标准分子的构建与应用 总被引：3，自引：1，他引：2
试验用PCR方法从玉米中扩增内源基因zSSIIb片段,并将其克隆到pMD18-T载体上,获得中间载体pMD-zSSIIb;根据Bt11和MON810玉米转化体特异性序列,分别设计带酶切位点的引物,扩增出Bt11和MON810转化体特异性产物;用相应的酶对pMD-zSSIIb和两种PCR产物进行酶切,分别将Bt11和MON810产物克隆到pMD-zSSIIb上,获得阳性标准分子pMD-ZB和pMD-ZM,并对其进行特异性测试。结果表明,获得的阳性标准分子可以作为转基因产品检测时的阳性对照。 相似文献