1、【创意版】RPAPCR技术的革命什么是RPA？自PCR技术诞生以来已经有三十年了。从经典PCR、实时定量PCR再到现在的数字PCR，这一技术在不断蜕变却从未淡出我们的视野。RPA（Recombinase Polymerase Amplification）全称重组酶聚合酶扩增技术，被称为可以替代PCR的核酸检测技术。.2 RPA技术主要依赖于三种酶：能结合单链核酸(寡核苷酸引物)的重组酶 单链DNA结合蛋白(SSB)链置换DNA聚合酶。这三种酶的混合物在常温下也有活性，最佳反应温度在37C左右。.3RPA的原理的原理.4.5Previouly established RPA Conditions
2、,2006.6.7.8.9.10 引物设计引物设计 RPA分析的关键在于扩增引物和探针的设计。PCR引物多半是不适用的，因为RPA引物比一般PCR引物长，通常需要达到30-38个碱基。引物过短会降低重组率，影响扩增速度和检测灵敏度。在设计RPA引物时，变性温度不再是影响扩增引物的关键因素。RPA的引物和探针设计不像传统PCR那样成熟，用户需要自己摸条件进行优化。.11Speed10 to 15 minute detection timeSensitivitySingle moleculeCostCheap access as little or no hardware is requiredS
3、implicityStabilised reaction format,minimal sample preparationRobustnessTo sample contaminants and temperature fluctuationsPortability Handheld instrumentation or disposable test format 为什么说为什么说RPA是一场技术革命是一场技术革命.12 RPA具体应用举例ClinicalFood safetyAgriculturalBlood bankscreeningEnvironmentalAnimal health
4、.13Recombinase Polymerase Amplification(RPA)of CaMV-35SPromoter and nos Terminator for Rapid Detection ofGenetically Modified CropsChao Xu 1,Liang Li 1,2,Wujun Jin 1,2 and Yusong Wan 1,2,*1 Biotechnology Research Institute,Chinese Academy of Agricultural Sciences,Beijing 100081,China;E-Mails:(C.X.);
5、(L.L.);(W.J.)2 Inspection and Testing Center for Environmental Risk Assessment of Genetic Modified Plant-RelatedMicroorganisms(Beijing),Ministry of Agriculture,Beijing 100081,China.141.IntroductionThe International Service for the Acquisition of Agri-biotech Applications(ISAAA)estimates that million
6、s of farmers cultivated genetically modified(GM)crops over more than 170 million hectares across 27 countries in 2013;the major GM crop species were canola,maize,cotton,and soybean 1.Although the polymerase chain reaction(PCR)is one of the most widely used amplification methods for GMO screening det
7、ection 3,the need for delicate equipment and complicated procedures limit the use of PCR amplification in point-of-use and field settings.Rapid,specific,and highly effective methods for identifying the presence of GMOs in food and feed are important and necessary 4.The most frequently used method fo
8、r detecting GMO material is screening for the CaMV-35S promoter(P-35S)from the cauliflower mosaic virus(CaMV)and the 3 non-translated region of the nopaline synthase gene(T-nos)from Agrobacterium mefaciens 11.In this work,we describe the initial development of a real-time RPA assay to detect P-35S a
9、nd T-nos sequences for purposes of GMO screening and etection.15.162.2.Sensitivity of the RPA Assays.17.182.3.Application to Practical Sample Analysis.193.1.Materials3.2.Extraction of Genomic DNA3.3.Oligonucleotide Primers and Probes RPA real time fluorescent assays include a forward primer,a revers
10、e primer,and a probe.3.4.RPA Assays RPA reactions were performed in a total volume of 50 L using a TwistAmp Exo kit(TwistDX,Cambridge,UK),29.5 L of TwistAmp rehydration buffer,420 nM each RPA primer,120 nM RPA probe,14 mM magnesium acetate,and 1 L of genomic DNA.mix freeze-dried reaction tube add Ma
11、gnesium acetate and rehydrated material Twista tube scanner device(39 C for 1525 min)Fluorescence measurements were taken every 20 s,A probit regression3.Experimental Section.204.ConclusionsIn this research,we have developed a rapid real-time RPA technique for the detection of P-35S and T-nos regulatory elements,which are widely employed in GM crops.This novel method can be easily adapted to other target genes for GMO detection.21
