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1.
本研究利用3种方法对新城疫病毒(Newcastle disease virus,NDV)进行检测,并对这3种检测方法的灵敏度和特异性作出比较。根据新城疫病毒的融合蛋白基因(F基因)设计合成6条特异性引物,利用水浴LAMP法、PCR及LAMP实时浊度仪进行检测。通过对恒温水浴中的反应温度、反应时间及反应液中Mg2+浓度进行优化获得最佳反应条件,结果用凝胶电泳分析;用优化的温度进行LAMP实时浊度仪检测,同时都与PCR方法进行比较。结果显示,获得了最佳反应条件,水浴LAMP方法最低检测限是1.58 pg,比PCR高100倍,而LAMP实时浊度仪检测灵敏度比水浴LAMP方法高10倍,最低检测限是0.158 pg。3种方法对其他非新城疫病毒均无检出。结果表明,新城疫病毒水浴LAMP检测方法速度快、不需要高精密的仪器,而且具有灵敏度高、特异性强、操作简单等特点,有望在核酸扩增领域取代PCR技术,LAMP浊度仪法检测灵敏度更高,但是所需仪器和试剂比较昂贵。  相似文献   

2.
为建立一种快速检测蜜蜂囊状幼虫病毒(SBV)的环介导等温扩增方法(LAMP),本研究根据SBV-UK株多聚蛋白基因序列(AF092924.1)设计了4条特异性引物,通过LAMP real-time Turbidimeter仪对SBV的反应体系和反应条件进行检测和实时监控,并评价其特异性、敏感性、重复性和稳定性。结果显示,在63℃恒温扩增40 min后,仅SBV核酸扩增,而其他病毒均呈阴性。反应结束后在反应体系中加入SYBR Green I的可视化判定结果与real-time Turbidimeter仪检测结果一致;该方法具有较强的特异性和较高的敏感性,其最低检出量为3.2×10~1拷贝/μL,是普通PCR的100倍;对同一批次和不同批次提取的SBV核酸进行扩增,结果表明重复性和稳定性良好;临床样品检测结果表明LAMP法与常规PCR法检测结果一致。本研究建立的LAMP方法操作简便,适用于SBV的快速检测。  相似文献   

3.
为建立羊痘病毒(CaPV)的环介导等温扩增(LAMP)检测方法,本研究根据GenBank中羊痘病毒的保守基因序列,设计出针对羊痘病毒的LAMP引物,利用LAMP Real Time Turbidimeter LA-320仪优化得到病毒核酸等温扩增最佳条件是62 ℃恒温反应60 min。在此条件下,病毒核酸的最低检测含量为3.1×10-2 pg/μL,灵敏度比OIE推荐的PCR方法高104倍。添加钙黄绿素(calcein)建立的目测法,还可实现对上述病原体检测结果肉眼观察。本研究获得的CaPV LAMP仪器法和目测法可特异性地扩增羊痘病毒属的山羊痘病毒、绵羊痘病毒及牛疙瘩皮肤病病毒核酸,具有反应快速、特异性强、灵敏度高、操作简便、设备要求低等特点。  相似文献   

4.
H1N1猪流感病毒环介导等温扩增快速检测方法的建立   总被引:2,自引:0,他引:2  
目的:建立H1N1猪流感病毒环介导等温扩增(LAMP)快速检测方法。方法:从GenBank中获得H1N1猪流感病毒血凝素(HA)、神经氨酸酶(NA)基因序列,应用DNAStar软件MegAlign程序分析其序列,利用Primer ExplorerV4软件在序列保守区域设计LAMP引物,即外引物和内引物,同时以H1N1猪流感病毒的cDNA作为阳性模板,对试验中的几个反应条件进行优化。结果:LAMP检测方法对H1N1猪流感病毒的灵敏度达到4~6个拷贝,其引物对于H9亚型禽流感病毒、猪瘟病毒和猪圆环病毒均无非特异性扩增,表现出良好的特异性。结论:建立的H1N1猪流感病毒环介导等温扩增快速检测方法灵敏度高、特异性强、重复性好,为快速检测猪流感病毒提供了新方法和新思路。  相似文献   

5.
猪流行性腹泻病毒LAMP检测方法的建立及初步应用   总被引:1,自引:0,他引:1  
猪流行性腹泻病毒是引起仔猪腹泻死亡的主要病原。为实现对猪流行性腹泻病毒(PEDV)的快速检测,利用PEDV S基因设计特异性引物,通过优化各种反应条件,建立了检测PEDV的环介导等温扩增快速检测方法(LAMP)。此方法特异性好,敏感度强,将反转录后的病毒c DNA稀释到108倍仍可检出,是PCR方法的100倍。本研究建立的LAMP方法操作简便、灵敏度高、特异性强,为临床PEDV的快速检测和预防奠定基础。  相似文献   

6.
为给实验室和现场检测提供一种快速且易于操作的志贺氏菌检测方法,通过将LAMP技术分别与荧光检测技术和浊度检测技术相结合,建立了灵敏、特异、准确的可视浊度/荧光环介导等温扩增(LAMP)检测方法。根据志贺氏菌基因保守序列,利用LAMP在线软件设计4条最佳引物,通过优化反应温度,分别建立了可视浊度环介导等温扩增检测方法(LAMP-浊度)以及可视荧光环介导等温扩增检测方法(LAMP-荧光),并分析所建立的两种方法的特异性和灵敏度。结果显示:所建立的LAMP-浊度方法最适反应温度是63℃,菌液灵敏度为13.6 cfu/mL,是普通PCR方法的10倍;所建立的LAMP-荧光方法最适反应温度是64℃,菌液灵敏度为1.36 cfu/mL,是普通PCR方法的100倍。利用4株志贺氏菌和10株非志贺氏菌,证实了建立的两种可视化LAMP方法具有良好的特异性。通过环介导等温扩增技术分别与浊度检测技术和荧光检测技术相结合,使其完成时间缩短至1 h内,整个扩增过程可实时监测,并可避免由于开盖加染料而导致的假阳性。  相似文献   

7.
非洲猪瘟病毒实时荧光LAMP检测方法的建立与应用   总被引:2,自引:0,他引:2  
为建立一种快速简便、灵敏度高、准确性好的非洲猪瘟病毒恒温快速检测方法,根据ASFV P72基因保守区域设计特异性引物,优化引物浓度、反应温度、反应时间,建立了一种基于SYTO9荧光染料的非洲猪瘟病毒实时荧光LAMP快速检测方法。结果表明,该方法在63℃条件下扩增40 min,该方法灵敏度高,最低可检测限为10 copies/μL;特异性良好,与猪伪狂犬病毒、猪瘟病毒、美洲型猪繁殖与呼吸综合征病毒、欧洲型猪繁殖与呼吸综合征病毒、猪流行性腹泻病毒无交叉反应;重复性好,变异系数低于5%。对70份临床样本检测,4份血液样品和9份脾脏样品检测阳性,与荧光定量PCR检测结果符合率为100%。该方法灵敏度高、特异性强、重复性好、符合率高,适用于非洲猪瘟现场快速诊断。  相似文献   

8.
为建立一种特异性强、灵敏度高、操作简单的猴痘病毒(Monkeypox virus, MPXV)检测方法,试验针对MPXV保守区OPG002基因片段设计特异性引物,通过优化环介导等温扩增技术(loop-mediated isothermal amplification, LAMP)反应体系中内引物、环引物体积及反应温度建立了一种MPXV实时荧光LAMP检测方法,对该方法的特异性和灵敏度进行了分析,并应用该方法检测了临床样品和模拟样品。结果表明:建立的MPXV实时荧光LAMP检测方法于64℃恒温反应60 min即可完成DNA检测;该方法能特异性地检出MPXV,最低检出限为25 copies/μL,灵敏度是普通PCR方法的20倍;该方法对12份临床样品的检测结果均为阴性,可检测出质粒浓度为0.5×102~0.5×106 copies/μL的模拟阳性样品。说明建立的MPXV荧光LAMP检测方法具有特异性强、灵敏度高、操作简单的优点,可用于MPXV的快速鉴别诊断。  相似文献   

9.
根据Q热贝氏柯克斯体(Coxiella burnetii)插入序列IS1111序列设计1套特异性引物,建立快速检测Q热的环介导等温扩增(loop-mediated isothermal amplification,LAMP)实时浊度检测方法。以梯度稀释含有目的扩增片段的重组质粒作为标准品,在恒温反应条件下,对靶基因的特定区域进行扩增,建立LAMP检测方法。结果显示,该方法能够检测出10个拷贝数的阳性质粒,而对结核分枝杆菌(M.tuberculosis)、衣原体(C.psittaci)、布鲁氏杆菌(Brucella.spp)及部分牛血液的核酸样本的特异性检测结果均为阴性,无交叉反应。本研究建立的LAMP实时浊度检测方法灵敏度高、特异性好,在Q热的检测与鉴定中具有良好的应用前景。  相似文献   

10.
试验旨在建立简易、快速、高效的鸡传染性喉气管炎病毒(infectious laryngotracheitis virus,ILTV)检测和诊断方法。根据GenBank上公布的ILTV TK基因序列,设计检测ILTV的特异性环介导的等温扩增(loop media-ted isothermal amplification,LAMP)技术反应引物,通过对LAMP反应体系和反应条件的优化,以及特异性、敏感性和临床样品的检测,建立了ILTV LAMP检测方法。结果显示,以内引物ILT9-FIP和ILT9-BIP、外引物ILT9-F3和ILT9-B3、环引物ILT9-LB和ILT9-LF为LAMP反应引物,反应温度为66℃时,所建立的LAMP检测方法反应效率最高;所建立的LAMP检测方法能够特异性地检测ILTV(匈牙利株和王岗株),不与新城疫病毒(NDV,B株)、鸡传染性支气管炎病毒(IBV,H52株和H120株)、大肠杆菌、鸡副嗜血杆菌、巴氏杆菌等发生交叉反应,且能够检测到的病毒最低浓度达到0.06pg/μL,其灵敏度是普通PCR方法的100倍;采用建立LAMP方法对50个临床样本进行检测,阳性率为14%,且与PCR检测结果的符合率达96%。本研究建立了特异性强、灵敏度高、操作简单的LAMP检测方法,适用于临床上ILTV的快速检测和诊断。  相似文献   

11.
Since the 5'UTR gene (GenBank No.:AY278459.1) had 4 isolated regions,we designed a set of 4 LAMP primers to specifically recognize target gene sequences.This study developed a loop-mediated isothermal amplification (LAMP) method for detecting BVDV,using the pyrophosphate magnesium white precipitate for Real-time detection in LAMP reaction process of turbidity instrument,Real-time monitor liquid turbidity to determine result.The whole reaction lasted only 50 minutes at a constructed temperature of 63 ℃ to evaluate specificity,sensibility and repeatability of the method.The result demonstrated that the LAMP assay could only react with BVDV,its specificity was high;It could detect at least 10-6-fold diluted samples,which was 100 more sensitive than PCR assay;And repeatability was good.The simple,rapid,high siensitivity and specificity LAMP assay was a potential tool for the detection of BVDV in field conditions.  相似文献   

12.
环介导等温基因扩增技术(loop-mediated isothermal amplification,LAMP)是一种特异、灵敏、快速的检测方法。为提高犬瘟热病毒(CDV)检测效率、降低检测成本,针对犬瘟热病毒N基因保守区的8个位点设计了6条引物进行RT-LAMP一步法扩增。对反应体系及条件优化,检测特异性、敏感性,扩增产物通过凝胶电泳、显色反应和浑浊度比较进行判定。试验结果表明,该方法特异性强、敏感度高,操作简便、快速、便于观察,适用于门诊和现场检测。  相似文献   

13.
Persistent infection and immunologic tolerance are important characteristics of bovine viral diarrhea disease, which have caused great difficulties on the diagnosis, quarantine and prevention of the bovine viral diarrhea virus (BVDV), so a fast and efficient detection method of BVDV is quite necessary. A pair of primers were designed based on the gene sequences of BVDV 5′UTR published in GenBank, then established the Real-time fluorescent quantitative RT-PCR detection method with SYBR Green Ⅰ to detect BVDV. The results showed that the detection method had high specificity, strong sensitivity and good repeatability. Thus, the detection method of the Real-time fluorescent quantitative RT-PCR would provide an effective means for the rapid detection of BVDV and persistent infected animals. It could supplement and perfect the quarantine and diagnostic methods of BVDV.  相似文献   

14.
为建立单核细胞增生李斯特菌(Listeria monocytogenes,LM)的快速检测方法,本研究以LM iap基因为靶基因设计合成引物及TaqMan探针,建立实时荧光定量PCR快速检测LM的方法。结果显示,对15株试验菌株进行实时荧光定量PCR检测,只有LM菌株检测为阳性,表明该检测方法特异性强;该方法的灵敏度为6.5 CFU/mL;稳定性和重复性试验结果表明,同一样品重复检测4次Ct值的变异系数均小于2%;利用该检测方法对采集的139份样品进行检测,共计检出3份LM阳性样品,与国标法(GB 478930-2010)检测结果一致。该检测方法灵敏度高、特异性强、重复性好,具有良好的实用性。  相似文献   

15.
To establish a rapid assay for Listeria monocytogenes(LM) detection,a Real-time PCR method was developed targeting iap gene of LM.The results showed that the test for 15 bacteria strains,only LM was positive,indicated that the method had high specificity.In addition,the sensitivity of Real-time PCR was 6.5 CFU/mL.Stability and reproducibility of the test showed that the coefficient of variation for the same sample repeat the Ct values were less than 2%.Furthermore,a total of 3 positive samples for LM were detected from 139 clinical samples by the method,which was in accordance with the testing result by GB 478930-2010 standard detection protocol.Therefore,the Real-time PCR method provides a novel rapid,sensitive and good repeatability detection method for LM infection.  相似文献   

16.
This study was aimed to establish a loop-mediated isothermal amplification (LAMP) assay for detection of porcine epidemic diarrhea virus (PEDV), and provide a simple, sensitive, accurate and reliable tool for diagnosis of PEDV.The conservative PEDV N gene (GenBank accession number: KT799997) of PEDV was selected as a target to design six specific primers.The reaction system and temperature of LAMP were optimized, and the LAMP method for specific amplification of PEDV was established. Results showed that the PEDV LAMP detection method was established successfully, and it could detect PEDV specifically at 60℃ for 60 min,and the detection limit was 91 copies/μL, which was one hundred-fold higher than conventional RT-PCR method.75 clinical samples were detected by LAMP and PCR, respectively, the coincidence of LAMP and PCR was about 97.3%. All the data suggested that the LAMP assay had strong specificity, high sensitivity, simple operation, low equipment requirement, and was suitable for rapid detection of PEDV clinical samples.  相似文献   

17.
试验旨在建立一种快速检测猪流行性腹泻病毒(PEDV)的环介导等温扩增方法(LAMP),为诊断PEDV提供简便、敏感、准确可靠的工具。参考GenBank中PEDV基因序列(登录号:KT799997),针对PEDVN基因设计了6条引物,对所建立的LAMP反应体系、反应温度进行优化,建立可特异性扩增PEDV的LAMP方法。结果显示,本试验成功建立了PEDV LAMP检测方法,在60℃恒温下反应60 min,能特异性地检测PEDV,检测限量为91拷贝/μL,比常规PCR方法的敏感性高100倍。对比75份临床样本的LAMP和常规RT-PCR法检测结果,显示两种方法符合率为97.3%。综上所述,本试验建立的LAMP方法具有特异性强、敏感性高,操作简单,设备要求低的特点,适用于PEDV临床样本的快速检测。  相似文献   

18.
In order to establish a duplex loop-mediated isothermal amplification (LAMP) method for the detection of shellfish parasitic infection with Perkinsus and Bonamia, primers were designed according to the conserved region of ITS and 18S rRNA gene sequences of Perkinsus and Bonamia deposited in GenBank using the online Primer Explorer 4.0.Firstly, the respective single LAMP detection assay of two parasites were developed, and then the reaction conditions were optimized by combining the two reaction systems into duplex LAMP method.The specificity and sensitivity of duplex LAMP method were examined and the confidence was evaluated by digesting the amplicons with respective endonuclease.The results showed that the established duplex LAMP method was specific enough to distinguish the two parasites from other parasites, and the detection limit of Perkinsus was 10 copies/μL plasmid DNA, the detection limit of Bonamia was 100 copies/μL plasmid DNA.The endonuclease digestion of duplex LAMP products certified the confidence of the established duplex LAMP method.The detection result of 20 Ruditapes philippinarum samples collected randomly from the East China sea and Yellow sea and 10 Ostrea edulis samples imported from USA showed that the duplex LAMP method could be used as a rapid detection method for infection with Perkinsus and Bonamia.  相似文献   

19.
为满足贝类寄生虫快速检测需求,本研究根据GenBank中发布的派琴虫ITS序列和包纳米虫18S rRNA序列的保守区域分别设计LAMP扩增引物,分别建立了两种寄生虫的单重LAMP检测方法,进一步对反应体系进行优化,组装成两种寄生虫的双重LAMP方法,同时还进行了特异性检测和敏感性检测,并通过对扩增产物进行限制性内切酶酶切检验双重LAMP方法的准确性。结果表明本研究建立的贝类寄生虫双重LAMP方法具有较好的特异性,检测派琴虫时的最低检测限为10拷贝/μL质粒DNA,检测包纳米虫时的最低检测限为100拷贝/μL质粒DNA,同时酶切试验也验证了双重LAMP检测结果的准确性。对随机采自东海和黄海的20份菲律宾蛤仔和10份美国进口牡蛎的检测结果显示,该双重LAMP方法在口岸检疫工作中可以作为派琴虫和包纳米虫的快速检测方法。  相似文献   

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