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牛病毒性腹泻病毒一步 RT-LAMP快速检测方法的建立

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Agricultural Science&Technology,201 4,1 5(1 O):1 826—1 829 Copyright c 2014,Information Institute of HAAS.Al lrights reserved Molecular Biology and Tissue Culture Development of an One—・step Reverse TranSCri ption Loop-med iated Isothermal Am pl ification Method for Rapid Detection of Bovi ne Vi ral Diarrhea Vi rus Wanzhe YUAN’,2,3 Teng WANG’ 3, Jianchang WANG ,Limin LI’,乏3 Xiuyuan ZHANG’,乏3 Jiguo SUN1, 1.College of Animal Medicine,Agricultural University of Hebei,Baoding 071 001,China; 2。Hebei Engineering and Technology Research Center of Veterinary Biotechnotogy,Baoding 071 001,China; 3.Norfh China Research Center of Animal Epidemic Pathogen Biology、Chinese Ministry of Agriculture,Baoding 071 001,China 4.Center of Technology,Hebei Entry・exit Inspection and Quarantine Bureau,Shijiazhuang 050051,China Abstract 『Ohiective1 This study aimed to develop a reverse transcription loop—medi- ated isothermal amplification(RT—LAMP)method for detecting BVDV.fMethod】Since gp48 gene of BVDV is among the most conserved regions,a set of four primers was designed to amplify six target sequences at the gp48 gene region for the RT- LAMP assay.The optimization of the RT—LAMP reaction was performed by evaluat— 牛病毒性腹泻病毒一步RT— LAMP快速检测方法的建立 袁万哲1,2,3,王腾 一,王建昌4李丽敏0 一,张 秀媛1.2.3,孙继国 (1.河北农业大学动物 陕学院,河北保定071001;2.河北省兽医生物 技术f 程技术研究中心.河北保定07100l;3. ing reaction temperature and reaction time. fResult1 The RT・LAMP aasay was suc- cessfully conducted at 56 oC within 40 min under isothermaI conditions.and the re- suits could be detected as Iadder-like bands using agarose gel electrophoresis.The RT.LAMP assay is highly sensitive and able to detect 3.74xl 00 copies/pl of BVDV 农、I 部动物疫病病原生物学华北l 观测实验 站 河』匕保定O71001;4.河北省j_{_j入境检验检 疫硒技术中心,河北石家庄050000) 摘要1日的1建 一种快速、敏感、特异的 检测牛病毒性腹泻病毒(BVI)V)反转录环介 导等温扩增(RT—LAMP)方法,为诊断与监测 BVDV提供准确可靠]:具..f方法]根据 RNA,as no cross-reaction was observed with other viruses. 【Conclusion】Overall, the newly established RT—LAMP assay indicates the potential application in both clinical diagnosis and field surveillance of BVDV。 Key words Bovine viral diarrhea virus (BVDV):Reverse transcription loop-mediated isothermaI amplification(RT—LAMP):Detection ( nB‘d『1k公布的BVDV序列.在其保守序列区 ovine viral diarrhea virus genus Pesfivirus in the family Flaviviridae.is a single—stranded posi— tive—sense RNA virus of approximately 1 2.5 kb[ .BVDV has a high prevalence munosorbent assay(E LISA),and re— 域没汁t r一套I,AMP引物,优化J 反应时间与 reaction(RT—PCR)[5-6].However,alI of these techniques have some intrinsic anscription—polymerase chain (BVDV),a member of the verse tr反应温度,建 r榆测BVDV的RT—I AMP方 法 、l结果I该方法能在56%等温条件下4O分 钟完成扩增,扩增结果Jlj通过凝胶电泳梯形带 判定 浚疗法具有良好的特异性和敏感性,最 disadVantages, such as requiring high—precision instrument or being time-consuming.In recent years,a rapid nucleic acid detection method, 低能榆测到3.?4xl0。copies/I.d的病毒RNA, if=i , 他痫毒无交义反应。I结论1该方法能 川于牛病毒性腹泻病毒的诊断与监测 关键词 牛病毒性腹泻病毒:RT—LAMP:检测 rate and low mortality,leading to sig。 nificant economic Iosses[21.The detri— mentaI effects of BVDV infection in— Ioop—mediated isothermaI amplification clude reduced milk production,re- duced reproductive performance, (LAMP),was developed【 .For the method。only a water bath is needed to amplify Iarge amounts of nucleic acids in 60 min approximately.The growth retardation.increased occur— rence of other diseases.and increased mortality among young stock[3 ̄.Calves source of virus shedding since they usually do not exhibit any apparent LAMP and reverse transcription Ioop— ated isothermal amplification fRT- infected persistently are a major mediLAM P1 methods have been proven to be rapid,simple,sensitive,specific and inexpensive for the detection of diferent DNA and RNA viruses【。 . RT.LAMP has been used to detect various viruses frOm animals such as clinical signs . The current methods for detecting BVDV include virus isolation. im— munofluorescence detection,electron 作者简介 袁万哲(1978一),男,陕西挟风人, 博士,副教授,从事预防兽医学的教学与科研工 作.E ai1:yuawwanzhe@l26.corn 通讯作者, an.origin influzenza A[9】-bovine ro一 博士.教授.博士生导师 从事预防兽医学的教 microscopy(EM),enzyme—linked im‘ avi学与科研工作,E nmil:vaccine2000@l26.(x)nl Corresponding author.E—mail:vaccine2000@1 26.com Received:August 10,2014 Accepted:September 28,2014 收稿日期修回日期2O14—08一l0 2014-09—28 2O14 1827 tavirus[12】.classicaI swine fever virus[8], and porcine reproductive and respira— tory syndrome virus[ . 1n this study,a rapid and feasible one—step RT-LAMP method was de- LAMP,the reaction was conducted by Hebei Province.The sample RNAs mixing 10×BstDNA Buffer.25 mmOI/L were extracted as described in Section MgCI2,2.5 mmOI/L dNTPs,1 0 pmol/L “Extraction of total RNA“.RT.PCR primers fP1:5’-ATA CCG AAT GGA AAG ATA C-3’:P2:5’-TAATAG AAC each primer,200 U/pI AMV reverse was performed using BVDV.specific transcriptase,8 U/ul Bst DNA poly- merase and 2 uI of totaf RNA in a 25 uI total reaction mixture.The RT—LAMP reaction was conducted at 58 oC for 50 min to terminate the reaction.The op— veloped for the detection of BVDV RNA.Since gp48 gene of BVDV is a- mong the most consewed regions,a GCT GAC GAA-3’).Briefly,RT-PCR was performed by using 1 ul Of RNA a 20 ul reaction volume by following the manufacturer’s protoco1 with the following cycling times and tempera— set of four primers was designed to amplify six target sequences at the min.followed by heating at 85℃for 1 0 template and 1 0 pmoI of each primer in timization of the RT.LAMP reaction was performed by evaluating the dif— gp48 gene region for the RT-LAMP assay.The method is highly sensitive and able to detect 3.74 x 1 00 copies/pl 0f BVDV RNA.as no cross-reaction es:94 oC for 3 min and 30 cycles of ferent reaction temperatures(54,55, turoCfor30 s,56 oCfor30 s、and 72℃ 56,57,and 58 oC)and times(10,2O, 94 was obsewed with other viruses.This newly established RT-LAM P should be a very valuable and applicable tool for the detection of BVDV.  40 s.RT-PCR products were ana・ 30,40,and 50 min).Negative controls forwere included in each experiment to check contamination.The RT—LAMP 2%agarose gel to determine the opti- lyzed by agarose gel electrophoresis and subsequently subjected to auto- products were electrophoresed using mated sequencing reactions(Invitro- mal parameters. Materials and Methods virus samples The BVDV BD--2 and BD--4 strain gen,Beijing,China).Subsequently,all samples were subjected to BVDV— timized reaction parameters. fic RT--LAMP assay using the op-- Specificity and sensitivity of RT- speciLAMP To evaluate the specificity of the were isolated fr0m infected calves in Hebei Province in 201 1.Strain BD一2 and BD一4 were propagated in Madin- RT-LAMP assay.experiments were performed using the optimized reac— tion parameters on a panel of BVDV strains includinq BD.2 and BD一4.In Results and Analysis A set of RT-LAMP primers based on highly consewed regions in the Darby bovine kidney(M DBK)cells in Dulbecco’s modification of Eagle’s gp48 gene of BVDV was designed us- tion,bovine rotavirus(BRV),en・ medium(DMEM)supplemented with addiornyocarditis virus (EMCV), 1 O%fetal calf serum(Sijiqing,China, cephalassicaI swine fever virus(CSFV), free of BVDV and antibody against cland Japanese encephalitis virus(JEV) BVDV). Extraction of totaI RNA ing Primer Explorer V4 software(Table 1 1.To determine whether the RT— LAMP primer set can be used for the detection of BVDV.the total RNA was extracted fr0m celI cultured super- were included.Three microliters of re— The viraI RNA was extracted with action products were eIectrODhOresed SYBR Green l was added into 25 ul Of reaction products,and the tube was examined under UV light.To examine the sensitivity of RT.LAM P for BVDV amplification,RT.LAMP was conduct— natants of the infected cells with BVDV and assayed using a RT—LAMP initiaI reaction parameters.The RT—LAMP products of the totaI RNA of BVDV generated a Iadder-like band in the 2% agarose ge1.Whereas the negative ng 2%agarose gels,or 1 UI Of the QIAamp@ViraI RNA kit(Qiagen, usiValencia,CA,USA)according to the manufacture’s protoco1.The extracted RNA was eluted in distilled water and stored at一80 oC until used for the RT— LAMP Or RT-PCR. Primer design The gp48 gene of BVDV.which is sufficiently consewed among the ran- domly selected BVDV isolates,was contro1 without the RNA template did ed using various concentrations of BVDV RNA as template.The RNA was quantified by NanoDrop 1 000 not gener ̄e such a band,indicating that the selected RT.LAMP primers were functiona1. In the initiaI experiment involving (Thermo Scientific USA)and was di— Iuted serially 1 0-fold frOm 3.74 xl 0 chosen for primer design.Primer Ex- the one-step RT-LAMP.the Iadder-like plored V4 software was used to design  as adequate as expect- copiesipI to 3.74xl 0一’copies/pl as tem・ band was nOtreaction was completed,the reaction products were electrophoresed using 2%agarose ge1. LAMP ampIificatiOn,a se ries Of expe ri- mprOve the efficjency Of RT- ate for RT.LAMP assay。After the ed.TO ithe RT-LAMP primers(http://pdmerex- plplorer.jp/e/).All primers were synthe— sized by invitrogen(Beijing,China). The nucleotide sequences of the primers are shown jn Table 1. Optimization of RT-LAMP parame- terS ments tO Oplimize the RT-LAM P pa- rameterS were cOnduCted.The ODti— ClinicaI samples Forty fecal samples were collect- mized RT-LAMP Daramelers were as fOllOws:jncubatiOn lemDerature at 56 ℃(Fig.1 A)and incubation t;me 0f 4O n (Fig.1 B).With these parameters, Om diferent daiy farms irn miFor the initial test of one--step RT-- came fred frOm calves with diarrhea.which Table 1 RT.LAMP primers desiqned for the detection of BVDV 1828 2014 4 5 l 2…J———● q(I【l——-. 7【l【l—. ()f】—— 3OfJ—+ 200 Lj[)0— 900 700 500 n 700— M,2 000 bp DNA Marker;in Fig.A,lane 1—5,RT—LAMP reaction temperature at 54—58℃. respectively;in Fig B,lane 1—5,RT-LAMP reaction incubated for 1 0,20,30,40,and 50 min,respectively;(A)Optimization of reaction temperature(B)Optimization of reaction time. Fig.1 Optimization of the RT—LAMP parameters for BVDV detection Lane 1.the RT—LAMP amplification of the totaf RNA fr0m BVDV;Iane 2 negative the Iadder—like bands frOm the total RNA frOm BVDV could be amplified Discussion and Concl usion RT—LAMP has been used in de- tecting viraI RNA molecules frOm ani- mals due to its simplicity and high sen— bovine rotavirus[ .classicaI swine fever virus[81,and porcine reproductive and respiratory syndrome virus【’ .A RT—LAMP based on 5’untranSIated control without RNA template for RT—LAMP reaction;M。2 000 bp DNA Marker. adequately by RT—LAMP(Fig.2). The RT-LAM P specifically de. tected BVDV,BRV, EMCV,CSFV, and J EV.No cross.reactivity with other viruses was observed.The specificity was fu rther confirmed by agarose gel eIeCtrOOhOresis and the color change after a fluorescent dye.The sensitivity Fig.2 RT—LAMP detection for BVDV using optimized parameters sitMty including influzenza A fH7N9)m]. the appropriate primers are chosen and the reaction parameters opti— mized.The reaction requires only a temperature adjustable water bath. Thirdly,the products of RT—LAMP are need for agarose geI eIectrODhOresis. NevertheIess.due to RT.LAMP high amplification.the problem of potential cross.contamination problems needs to be addressed[ . In conclusion.RT—LAMP assay is a rapid.specific and sensitive method that can be used as a valuable toolin Of RT-LAMP was assessed by using a ten—fold seriaI dilution of BVDV RNA. The detection Iiml{of the method was region(5’UTR)of BVDV was also de— visible to the naked eye without the veloped to detect BVDV RNA,which was successfully conducted at 63℃ within 60 min under isothermaI condi— tionst .In this study.a highly efficient and practical method based on gp48 3.74x1 00 copies&I(Fig.3). Four of 40 fecal samples were positive by RT—PCR analysis.AII RT- PCR positive samples are also RT— LAMP positive.Al lOf RT—PCR positive samples were true positive as evi— denced by DNA sequence analysis。 gene of BVDV was established for the detection of BVDV Most of the amplifi- cation reactions could be finished within 40 min.Thus.the RT-LAMP as— say is faster than RT—PCR.Secondly. both clinicaI diagnosis and field surveillance of BVDV. suggesting that no nonspecific amplifi— cation in RT—LAMP reaction occurred. the RT—LAM P is easy to perform once Acknowledgements we thank Dr Qiufeng Lj and Yanxia Gao fCollege of AnimaI Scl_ ence and Technoloy,Agricultural Uni- versity of Hebei1 for collecting fecaI samples frOm calves with diarrhea. 1 200 900 700 References [1】RIDPATH JF.BVDV genotypes and biotypes:practicaI implications for diag。 500 300 t00 nosis and controI『J1.Biologicals,2003, 31:127-131. [2】HOUE H.Epidemiology of bovine viral diarrhea virus.Vet.Clin.North Am fJ]. 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