鸭痘病毒TaqMan荧光定量PCR检测方法的建立

为建立检测鸭痘病毒的TaqMan荧光定量PCR方法,本试验克隆了鸭痘病毒P4b基因,构建重组质粒pMD-DPV-P4b,并将其作为标准阳性模板。参照GenBank收录的禽痘病毒P4b基因设计合成1对特异性引物及与该引物相匹配的特异探针。以定量的10倍系列稀释的质粒pMD-DPV-P4b为标准品,通过对反应条件进行优化,建立了一种检测鸭痘病毒的TaqMan荧光定量PCR方法。结果显示,该方法与禽流感病毒、鸭黄病毒、鸭肝炎病毒、新城疫病毒、鸭瘟病毒和小鹅瘟病毒等其他水禽病毒,以及山羊痘病毒和鸡痘病毒等其他痘病毒均无交叉反应,特异性好。该方法最低检测限为1.29×10²拷贝/μL,比普通PCR检测方法高100倍。组内和组间变异系数均小于2%。结果表明,本试验所建立方法具有灵敏、特异、安全、快速的特点,适用于鸭痘病毒的检测。     

鸭坦布苏病毒和鸭瘟病毒二重荧光定量RT-PCR方法的建立

The study was conducted to establish the duplex Real-time PCR assay for detecting both duck tembusu virus (DTMUV) and duck plague virus (DPV). According to the sequences of DTMUV E gene and DPV UL6 gene in GenBank, two sets of specific oligonucleotide primers for DTMUV and DPV along with two TaqMan probes were designed. The duplex Real-time PCR assay was developed through optimization of reaction conditions and validation of specificity, sensitivity and repetitiveness of the method. The sensitivity of the assay were both 100 template copies for DTMUV and DPV. There was no specific bands of the same sizes were amplified from other duck pathogens, such as duck Newcastle disease virus, duck hepatitis virus, muscovy duck parvovirus, duck circovirus, H9 subtype avian influenza virus, egg drop syndrome virus. This duplex Real-time RT-PCR assay is a sensitive, quick, specific and quantitative test for detection of DTMUV and DPV, and will be useful for the control of these viruses in ducks.     

化脓隐秘杆菌TaqMan实时荧光定量PCR检测方法的建立

本试验旨在建立检测化脓隐秘杆菌(Arcanobacterium pyogenes,A.pyogenes)特异、灵敏的TaqMan实时荧光定量PCR检测方法。根据GenBank公布的化脓隐秘杆菌溶血素(pyolysin,PLO)基因高保守序列,设计特异性引物和探针建立检测体系,用于化脓隐秘杆菌的快速检测,并对该方法的特异性和灵敏度进行检测。结果显示,本试验建立的TaqMan实时荧光定量PCR方法仅对化脓隐秘杆菌的检测结果为阳性;该方法最低检测DNA浓度为77.6 fg,最低检测细菌浓度为63 CFU/mL。采用本研究建立的方法检测23份林麝临床病例样品,共鉴定出16株化脓隐秘杆菌,与API Coryne生化鉴定方法的结果相同。本研究为化脓隐秘杆菌的检测提供了一种灵敏、特异、快速的检测方法,其可用于化脓隐秘杆菌的诊断和流行病学调查。     

Establishment of TaqMan Real-time PCR Assay for Detection of Arcanobacterium pyogenes

The study was aimed to establish a specific and sensitive TaqMan Real-time PCR assay for detection of Arcanobacterium pyogenes (A.pyogenes).Based on the conservative sequence of pyolysin (PLO) gene of A.pyogenes published in GenBank, specific primers and TaqMan probes were designed. The TaqMan Real-time PCR assay was established, and the specificity and sensitivity were tested.The specificity test results showed that only A.pyogenes exhibited typical curves.The detection sensitivity of this assay was 77.6 fg genomic DNA per 20 μL reaction, and 63 CFU/mL for pure cultures.16 out of 23 clinical samples were positive detected by the TaqMan Real-time PCR assay, which were consistent with API Coryne identification.The TaqMan Real-time PCR assay developed in this study was specific and sensitive for detection of A.pyogenes, and it could be used for identification and epidemiological investigation of A.pyogenes.     

探针实时荧光定量PCR检测白藜芦醇体外抗鸭瘟病毒活性方法的建立及应用

建立以TaqMan荧光探针为特点的PCR,检测白藜芦醇体外抗鸭瘟病毒活性。本研究针对鸭瘟病毒UL30基因序列设计特异性引物和TaqMan荧光探针,建立鸭瘟病毒TaqMan探针实时荧光定量PCR检测方法,并验证方法的特异度、敏感度和稳定性及对临床样品进行检测;运用该方法检测白藜芦醇对鸭胚成纤维细胞接种鸭瘟病毒后细胞中病毒增殖情况的影响,用以评价该药物体外抗鸭瘟病毒效果。结果显示,该方法建立的定量标准曲线阈值循环数（Threshold cycle,Ct）与模板拷贝数呈良好线性关系（R2=0.997）,斜率为-3.328,扩增效率（E）为99.7%,具有良好的特异度、敏感度和稳定性并能对临床样本进行准确的检测。运用该方法检测白藜芦醇体外抗鸭瘟病毒结果显示：经白藜芦醇处理后,染毒细胞中病毒拷贝数为（7.71±0.37）×10^4,与病毒对照组比较（5.63±0.26）×10^6明显减少（P〈0.01）。结果表明,TaqMan探针实时荧光定量PCR方法建立并成功用于体外药物抗鸭瘟病毒的检测;白藜芦醇具有良好的体外抗鸭瘟病毒活性。     

鸭呼肠孤病毒TaqMan与SYBR Green荧光定量检测方法的建立及比较

本研究旨在针对新型鸭呼肠孤病毒(NDRV)建立两种快速、敏感、特异的荧光定量PCR诊断方法并对其临床实用性进行比较.试验根据呼肠孤病毒S1基因序列设计合成1对特异性引物和1条MGB探针,分别建立TaqMan和SYBR GreenI两种荧光定量PCR检测方法,并对两种方法的特异性、灵敏性、重复性进行比较.结果 显示,两种...     

鸭甲型肝炎病毒1型与3型双重TaqMan实时荧光定量PCR检测方法的建立与应用

旨在建立一种针对鸭甲肝病毒1型（DHAV-1）和鸭甲肝病毒3型（DHAV-3）的高效快速、高灵敏度和高特异性的双重TaqMan实时荧光定量PCR （q-PCR）检测方法并应用于临床疑似样品检测。根据DHAV-1和DHAV-3的VP1基因保守区域,分别设计合成了2对特异性引物和探针,在此基础上建立并优化了双重TaqMan实时荧光定量PCR方法。结果显示：优化后标准曲线的相关系数（R²）均在0.999以上,扩增效率（E）在105%~110%,其组内变异系数（i-CV）与组间变异系数（c-CV）均在0.77%以下。运用双重q-PCR方法对不同稀释度的混合质粒与病毒核酸进行检测,结果表明,建立的双重TaqMan q-PCR特异性高;同时检测DHAV-1和DHAV-3的灵敏度均可达10个拷贝,分别是常规PCR方法的1 000倍和100倍。对40份来自苏中、苏北地区的疑似鸭肝炎病毒感染的鸭组织病料进行检测,结果表明,q-PCR方法检出36份阳性病料,阳性率为90%;而常规PCR方法未能检出高Ct值的样品,阳性率为72.5%（29份阳性病料）。建立的双重TaqManq-PCR检测方法为DHAV-1与DHAV-3的临床样品检测提供了高效、灵敏、特异的工具,推动了临床分子流行病学调查及病毒定量分析等研究。     

鸭瘟病毒感染鸭十二指肠黏膜炎症相关基因及调控通路的筛选

试验旨在分析鸭瘟病毒（duck plague virus，DPV）感染樱桃谷鸭后十二指肠黏膜转录组水平的变化，筛选出DPV感染后参与炎症的相关基因和调控通路。DEV-GZ株经腿部肌肉接种35日龄鸭后，于接种后24、48和72 h采集鸭十二指肠黏膜组织样本，提取总RNA进行转录组测序，对数据进行质控与注释，筛选与炎症相关的差异表达基因及调控通路，并应用实时荧光定量PCR对部分差异表达基因进行验证。结果显示，对照组与试验组总计得到21.39 Gb的Clean Bases，测序样本有效序列占原始序列的99%以上，映射率高于83%。鸭接毒DPV后24 h十二指肠黏膜的差异表达基因有221个，参与炎症相关生物学过程的有3个，均为下调基因；接毒DPV后48 h差异表达基因有499个，参与炎症相关生物学过程的有17个，均为下调基因；接毒DPV后72 h差异表达基因有798个，参与炎症相关生物学过程的有20个，其中上调基因13个、下调基因7个。GO数据库分析显示，参与炎症相关的差异表达基因主要是CCR8、CCL19、CCL4、IL-17、IRF1、IFN-γ、SLC11A1等，涉及急性炎症反应、趋化因子受体活性、急性期反应、炎症反应和炎症反应的正调节等生物学过程。KEGG数据库分析显示，差异表达炎症相关基因主要富集在Toll样受体信号通路、NF-κB信号通路、IL-17信号通路、TNF信号通路和炎症性肠病等；实时荧光定量PCR结果显示，IFN-γ和MALT基因的相对表达倍数与转录组结果基本一致。本试验完成了DPV感染樱桃谷鸭十二指肠的转录组测序分析，获取了差异表达基因的功能注释信息，初步揭示了参与DPV感染的炎症相关通路，为深入探究DPV的致病机制提供了理论参考。     

鸭瘟病毒SYBR Green I荧光定量PCR检测方法的建立

为建立鸭瘟病毒（DPV）快速、敏感的检测方法,本研究利用PCR技术扩增出DPV UL30基因中510bp的保守序列,并克隆到p MD18-T载体中作为标准品制作标准曲线,建立了DPV的SYBR Green I荧光定量PCR检测方法。该方法检测灵敏度可达5×101拷贝,与鸭细小病毒、鸭圆环病毒、小鹅瘟病毒、鸭肝炎病毒、鸭H9亚型流感病毒和鸭副粘病毒均不发生交叉反应,具有良好的特异性和重复性。结果表明,建立的实时荧光定量PCR具有特异、敏感、快速、定量、重复性好等优点,可用于临床DPV的检测。     

禽(番鸭)呼肠孤病毒TaqMan探针荧光RT-PCR检测方法的建立及应用

为了建立检测(番鸭)呼肠孤病毒(DRV)感染的方法,本研究根据DRV的σNS基因核苷酸序列设计引物及TaqMan探针,经过反应条件的优化,建立了该病毒的TaqMan探针实时荧光RT-PCR检测方法.用已知浓度的重组质粒为标准品,构建的标准曲线的相关系数达到99%.试验表明,该方法的重复性、稳定性、特异性良好,且灵敏度高,可以检测到1.0×10~2拷贝/μL的标准品,比普通PCR至少高100倍.该检测方法对DRV人工感染番鸭肝脏组织检出率达到100%.本实验所建立的TaqMan探针荧光RT-PCR为的快速检测以及进行分子流行病学的调查提供了新的技术手段.     

Establishment and Application of A Double TaqMan MGB Real-time PCR Assay for Detection of Canine Distemper Virus and Canine Parvovirus

This study was aimed to establish a double TaqMan MGB Real-time PCR assay to simultaneously and specifically detect canine distemper virus (CDV) and canine parvovirus (CPV) in one reaction.Two pairs of specific primers for CDV and CPV,along with two TaqMan MGB probes for each virus were designed in the assay basing on CDV H gene and CPV VP2 gene sequences.The specificity,sensitivity and repetition of the double TaqMan MGB Real-time PCR assay were tested,and 48 samples taken from clinic suspicious CDV and CPV infected canines had been testified by the established double TaqMan MGB Real-time PCR.The results indicated that the doulde TaqMan MGB Real-time PCR assay was successfully established,and the number of standard curve correlation (R²) of CDV and CPV were 0.997 and 0.993,respectively.The specificity of the double TaqMan MGB Real-time PCR assay revealed that amplifications were showed on CDV and CPV samples,but other pathogens and negative controls had no amplifications;The sensitivity of CDV and CPV were both 10 copies/μL.Meanwhile,14 CDV positive samples,19 CPV positive samples and 4 CDV/CPV double positive samples were detected,which were consistent with the results of the sequencing.Therefore,the established double TaqMan MGB Real-time PCR assay had high sensitivity,specificity and flux accurate quantitative,which could be applied to clinical CDV/CPV infection each periods.     

Establishment of a Duplex TaqMan Real-time PCR Method for Detection of Bovine Viral Diarrhea Virus Types 1 and 2

【Objective】 This study was aimed to establish a duplex TaqMan Real-time PCR method for rapid detection of Bovine viral diarrhea virus types 1(BVDV1) and 2(BVDV2).【Method】 Specific primers were designed based on the 5'-non-coding region of 95 strains of BVDV1 and BVDV2 in GenBank.The positive plasmids containing the target fragments of BVDV1 and BVDV2 were constructed.The reaction conditions were optimized, the standard curve was constructed, the specificity, sensitivity and reproducibility of the duplex TaqMan Real-time PCR method were tested, and the established duplex TaqMan Real-time PCR assay was used to detect the clinical samples collected from Jilin province.【Result】 The results showed that the optimal annealing temperature of the duplex TaqMan Real-time PCR was 57.0 ℃, the optimum primer concentration was 0.5 μmol/L, and the optimum probe concentration was 0.3 μmol/L.The standard curves of BVDV1 and BVDV2 were Y=-3.54X+37.36 (R²=0.990) and Y=-3.18X+35.95 (R²=0.997), respectively.There was no specific amplification of Infectious bovine rhinotracheitis virus (IBRV), Bovine respiratory syncytial virus (BRSV) and Bovine parainfluenza virus type 3 (BPIV3), with intra- and inter-batch CV less than 3%, and the lower limit of detection was 10 copies/μL.The results of clinical samples showed that the overall positive rate was 23.1% (36/156), of which 17.9% (28/156) were positive for BVDV1 and 5.1% (8/156) were positive for BVDV2.【Conclusion】 In this study, a duplex TaqMan Real-time PCR method was established, which could identify BVDV types 1 and 2 simultaneously, quickly and accurately, and provided technical support for the prevention, control and purification of BVDV.     

鸭副黏病毒和鸭圆环病毒二重荧光定量PCR检测方法的建立

根据鸭副黏病毒(DPMV)和鸭圆环病毒(DuCV)保守基因序列,设计了2对针对鸭副黏病毒和鸭圆环病毒的特异性引物和2条不同荧光基团标记的TaqMan探针,建立了鸭副黏病毒和鸭圆环病毒的二重荧光定量PCR检测方法。该方法敏感性好,对鸭副黏病毒和鸭圆环病毒的检测敏感性分别达到160和140个拷贝数;该方法特异性强,对鸭肝炎病毒、番鸭细小病毒、鸭瘟病毒和H9型禽流感病毒等病原体的检测全为阴性;应用该方法对118份临床病料进行检测,结果检出鸭副黏病毒和鸭圆环病毒阳性感染率分别为0.85%和8.47%,无混合感染。本试验建立的二重荧光定量PCR具有快速、特异、敏感和重复性好等优点,适用于鸭副黏病毒和鸭圆环病毒的快速诊断和监测。     

Development of Real-time PCR Method for Rapid Detection of Vibrio parahaemolyticus

To establish a rapid assay for detection of Vibrio parahaemolyticus(VP), Real-time PCR method was developed targeting to toxR gene of Vibrio parahaemolyticus.The results showed that the test for 15 bacteria strains using the Real-time PCR method, only Vibrio parahaemolyticus test was positive, indicating that the method had high specificity.In addition, the sensitivity of Real-time PCR was 4.9 CFU/mL.Furthermore, a total of 3 positive samples for Vibrio parahaemolyticus were detected from 150 clinical samples by the Real-time method, which was in accordance with the testing result by GB 4789.7-2013 standard detection protocol.Therefore, the Real-time method provided a novel rapid and sensitive detection method with good practicality for Vibrio parahaemolyticus infection.     

二重PCR检测鸭瘟病毒和鹅细小病毒的初步研究

根据鸭瘟病毒(Duck plague virus,DPV)DNA聚合酶基因和鹅细小病毒(Goose parvovirus,GPV)NS基因序列分别设计2对引物,应用这2对引物对混合样品中鸭瘟病毒和鹅细小病毒进行了二重PCR扩增。PCR产物的琼脂糖凝胶电泳结果表明2条特异性带为563bp(DPV)和1146bp(GPV),与实验设计相符,且与常规单一PCR结果一致。二重PCR反应检测出的DPV含量相当于20个PFU;检测出的GPV含量相当于0.1个ELD50,对禽痘病毒和减蛋综合征病毒的核酸未能扩增出任何条带,特异性良好。该二重PCR能够在一次扩增反应中检测两种病毒,为两种鹅病的病原检测和诊断提供了一种简便、经济、快速的手段。     

副溶血弧菌实时荧光定量PCR快速检测方法的建立

为建立检测副溶血弧菌(Vibrio parahaemolyticus,VP)的快速检测方法,本研究以VP toxR基因为靶基因设计合成引物及TaqMan探针,建立了实时荧光定量PCR快速检测VP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VP检测为阳性,表明该检测方法特异性强;该方法的灵敏度为4.9 CFU/mL,利用该检测方法对采集的150份样品进行检测,共计检出3份VP阳性样品,与国标法(GB 4789.7-2013)检测结果一致,显示了良好的实用性。该检测方法灵敏度高、特异性强,具有良好的实用性。     

单核细胞增生李斯特氏菌实时荧光定量PCR快速检测方法的建立

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。     

Development of A Dual Real-time PCR for the Rapid Detection of Listeria monocytogenes

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.     

鸭坦布苏病毒TaqMan荧光定量RT-PCR检测方法的建立

根据鸭坦布苏病毒(DTMUV)BYD-1株基因序列设计特异性引物和TaqMan探针,建立了快速检测DTMUV的实时荧光定量RT-PCR方法。特异性结果显示,DTMUV显示阳性,而3株非鸭坦布苏病毒均显示阴性,说明该方法具有高度特异性。其表达式为Ct=-3.32×lg Copy number+41.151,R2=0.998,R循环效率Eff%=100.072,DNA拷贝数在101～108范围内检测曲线有良好的线性关系,对质粒标准品最低检测限为1.0×101拷贝/μL,变异系数低于5%。利用该方法分别对攻毒感染具有典型鸭新型黄病毒病临床症状和病理变化的蛋鸭的脾脏和肝脏组织进行检测,阳性率均为100%,而用本实验室建立的普通RT-PCR方法检测的阳性检测率为85%(17/20)和75%(15/20)。建立的方法具有敏感性高、特异性好、稳定性强的特点,可用DTMUV早期感染的快速诊断和流行病学调查。